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Prof. Dr. Yongjun Sun
College of Urban Construction, Nanjing Tech University, Nanjing 211816, China

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0 Industrial wastewater treatment
0 Advanced Oxidation technology
0 Flocculation and flocculants
0 Coagulation and coagulants
0 Domestic sewage treatment

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Advanced Oxidation technology

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Journal article
Published: 14 August 2021 in Separation and Purification Technology
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A hybrid flocculant, PAC-CA, with the advantages of inorganic and organic flocculants, was prepared, and the coagulation behavior and floc characteristics of PAC-CA for removing titanium dioxide nanoparticles (TiO2-NPs) under different conditions were studied. The effects of monomer mass ratio, initiator concentration, hydroxyl aluminum ratio, reaction temperature, and polymerization time on the coagulation performance for TiO2-NP removal were studied. PAC-CA was characterized through SEM, FT-IR, TG-DSC, XRD, XPS, and Ferron complex colorimetric characterization. The characterization results showed that PAC-CA was successfully copolymerized using AlCl3, carboxymethyl chitosan, and acrylamide. The high content of Alb in PAC-CA helped improve the coagulation performance. When the dosage was 30 mg/L, the pH was 8, the stirring intensity was 200 s−1, and the settling time was 30 min, the optimal removal rates for TiO2-NPs and turbidity were 87.30% and 91.72%, respectively. Kaolin could effectively improve the TiO2-NP removal efficiency and promote the density and particle size of flocs. Humic acid exerted an inhibitory effect on coagulation efficiency with loose and small flocs.

ACS Style

Yongjun Sun; Yuanyuan Yu; Deng Li; Jun Zhai; Huaili Zheng. Enhanced coagulation for TiO2-NPs removal by using a hybrid flocculant. Separation and Purification Technology 2021, 277, 119480 .

AMA Style

Yongjun Sun, Yuanyuan Yu, Deng Li, Jun Zhai, Huaili Zheng. Enhanced coagulation for TiO2-NPs removal by using a hybrid flocculant. Separation and Purification Technology. 2021; 277 ():119480.

Chicago/Turabian Style

Yongjun Sun; Yuanyuan Yu; Deng Li; Jun Zhai; Huaili Zheng. 2021. "Enhanced coagulation for TiO2-NPs removal by using a hybrid flocculant." Separation and Purification Technology 277, no. : 119480.

Journal article
Published: 09 July 2021 in Water
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In this study, a Cu–[email protected] ozone catalyst with multiple active components was prepared through the impregnation method to treat purified terephthalic acid (PTA) wastewater, and characterized by X-ray diffraction, X-ray fluorescence spectroscopy, scanning electron microscopy, specific surface area analysis, X-ray energy spectroscopy, X-ray photoelectron spectroscopy, and other methods. The Cu–[email protected] ozone catalyst had a developed pore structure with a large specific surface area and crystal structure. After calcination, the metallic elements Cu and Ce existed in the state of oxides CuO and CeO2. The effects of reaction time, solution pH, catalyst dosage, and ozone dosage on the catalytic oxidation performance of the Cu–[email protected] ozone catalyst were studied. Adding tert-butanol reduced the removal rate of COD from the PTA wastewater through the catalytic oxidation system, which proves that a Cu–[email protected] ozone catalyst treatment process of PTA wastewater follows the free-radical reaction mechanism. The results of 3D fluorescence spectroscopy analysis show that the organic matter in the PTA wastewater was converted into tryptophan organic matter and aromatic organic matter after the reaction of the catalytic oxidation system. Ultraviolet absorption spectroscopy analysis indicated that in unsaturated chemical bonds, some conjugated structures and benzene ring structures of organic matter in the PTA wastewater were destroyed.

ACS Style

Xi Lu; Shuqian Xie; Shuai Li; Jun Zhou; Wenquan Sun; Yanhua Xu; Yongjun Sun. Treatment of Purified Terephthalic Acid Wastewater by Ozone Catalytic Oxidation Method. Water 2021, 13, 1906 .

AMA Style

Xi Lu, Shuqian Xie, Shuai Li, Jun Zhou, Wenquan Sun, Yanhua Xu, Yongjun Sun. Treatment of Purified Terephthalic Acid Wastewater by Ozone Catalytic Oxidation Method. Water. 2021; 13 (14):1906.

Chicago/Turabian Style

Xi Lu; Shuqian Xie; Shuai Li; Jun Zhou; Wenquan Sun; Yanhua Xu; Yongjun Sun. 2021. "Treatment of Purified Terephthalic Acid Wastewater by Ozone Catalytic Oxidation Method." Water 13, no. 14: 1906.

Journal article
Published: 09 July 2021 in Separation and Purification Technology
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In this study, the honeycomb ceramic catalyst Fe/[email protected] with high catalytic activity was prepared. The effect of preparation conditions on the catalytic performance of Fe/[email protected] was systematically studied. Scanning electron microscope; X-ray energy spectrum analysis; X-ray diffraction; specific surface area, pore distribution and adsorption performance analysis; X-ray fluorescence spectroscopy; and X-ray photoelectron spectroscopy were performed to analyze the structural characteristics of the catalyst. The optimal working conditions of the catalytic ozonation system for the degradation of Fischer–Tropsch synthesis wastewater were also studied. The metal elements Fe and Mn were successfully loaded on the surface of the honeycomb ceramic carrier in the form of α-MnO2 and α-Fe2O3 oxides. The optimal COD removal rate could reach 64.37% at pH of 9, ozone dosage of 6 g/h, Fe/[email protected] dosage of 50 g/300 mL, and reaction time of 60 min. The specific mechanism of catalytic ozonation in the presence of tert-butanol was explored through ultraviolet absorption spectroscopy and three-dimensional fluorescence spectroscopy. The COD removal efficiency for Fischer–Tropsch synthesis wastewater was analyzed on the basis of catalytic oxidation reaction kinetics. Finally, a multilevel gray correlation evaluation model was established for the quantitative evaluation of the ozonation catalytic oxidation of Fischer–Tropsch wastewater.

ACS Style

Lei Guo; Zhiqiang Xiao; Wenquan Sun; Hao Xu; Yanhua Xu; Huaili Zheng; Yongjun Sun. Fischer–Tropsch synthetic wastewater treatment with Fe/[email protected]: Catalytic ozonation and process evaluation. Separation and Purification Technology 2021, 276, 119274 .

AMA Style

Lei Guo, Zhiqiang Xiao, Wenquan Sun, Hao Xu, Yanhua Xu, Huaili Zheng, Yongjun Sun. Fischer–Tropsch synthetic wastewater treatment with Fe/[email protected]: Catalytic ozonation and process evaluation. Separation and Purification Technology. 2021; 276 ():119274.

Chicago/Turabian Style

Lei Guo; Zhiqiang Xiao; Wenquan Sun; Hao Xu; Yanhua Xu; Huaili Zheng; Yongjun Sun. 2021. "Fischer–Tropsch synthetic wastewater treatment with Fe/[email protected]: Catalytic ozonation and process evaluation." Separation and Purification Technology 276, no. : 119274.

Journal article
Published: 23 June 2021 in Water
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In this study, a high-efficiency magnetic heavy metal flocculant [email protected] was prepared based on carboxymethyl chitosan and magnetic Fe3O4. It was characterized by SEM, FTIR, XPS, XRD and VSM, and the Cu(II) removal rate was used as the evaluation basis for the preparation process. The effects of AMPS content, total monomer concentration, photoinitiator concentration and reaction time on the performance of [email protected] flocculation to remove Cu(II) were studied. The characterization results show that [email protected] has been successfully prepared and exhibits good magnetic induction characteristics. The synthesis results show that under the conditions of 10% AMPS content, 35% total monomer concentration, 0.04% photoinitiator concentration, and 1.5 h reaction time, the best yield of [email protected] is 77.69%. The best removal rate is 87.65%. In addition, the response surface optimization of the synthesis process of [email protected] was performed. The optimal synthesis ratio was finally determined as iron content 6.5%, CMFS: 29.5%, AM: 53.9%, AMPS: 10.1%. High-efficiency magnetic heavy metal flocculant [email protected] shows excellent flocculation performance in removing Cu(II). This research provides guidance and ideas for the development of efficient and low-cost flocculation technology to remove Cu(II) in wastewater.

ACS Style

Yuanyuan Yu; Yongjun Sun; Jun Zhou; Aowen Chen; Kinjal Shah. Preparation and Characterization of High-Efficiency Magnetic Heavy Metal Capture Flocculants. Water 2021, 13, 1732 .

AMA Style

Yuanyuan Yu, Yongjun Sun, Jun Zhou, Aowen Chen, Kinjal Shah. Preparation and Characterization of High-Efficiency Magnetic Heavy Metal Capture Flocculants. Water. 2021; 13 (13):1732.

Chicago/Turabian Style

Yuanyuan Yu; Yongjun Sun; Jun Zhou; Aowen Chen; Kinjal Shah. 2021. "Preparation and Characterization of High-Efficiency Magnetic Heavy Metal Capture Flocculants." Water 13, no. 13: 1732.

Journal article
Published: 09 June 2021 in Water Science and Technology
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To cope with the increasingly severe challenges of zinc oxide nanoparticles (ZnO-NPs) in the field of the aquatic environment, this paper uses poly-aluminum ferric chloride (PAFC) and cationic polyacrylamide (CPAM) as coagulants to enhance the removal of ZnO-NPs from water. In two environments (pure-water environment and kaolin environment) that simulate suspended solids, we studied the dosage, pH, precipitation time, and hydraulic power of ZnO-NPs at three different initial concentrations (1, 2, and 30 mg/L). The effects of various conditions on the performance of PAFC, CPAM, and PAFC/CPAM to remove ZnO-NPs were examined. Results showed that the overall removal rate of ZnO-NPs in the kaolin environment was slightly higher than that in the pure-water environment. In contrast the removal rate of ZnO-NPs in the PAFC/CPAM was significantly higher than that of PAFC or CPAM alone. The coagulation removal conditions of ZnO-NPs were optimized using a response-surface model. Under the best conditions, the removal rate of ZnO-NPs with an initial mass concentration of 30 mg/L in the PAFC/CPAM combination in pure-water and kaolin environments was 98.54% and 99.17%, respectively. Finally, by studying the changes in floc size during coagulation, enhanced coagulation was an efficient method of removing ZnO-NPs from water.

ACS Style

Zhaoyang You; Changrong Zhao; Yongjun Sun; Chang Zhuang. Application of PAFC/CPAM for the removal of ZnO nanoparticles by enhanced coagulation. Water Science and Technology 2021, 84, 484 -498.

AMA Style

Zhaoyang You, Changrong Zhao, Yongjun Sun, Chang Zhuang. Application of PAFC/CPAM for the removal of ZnO nanoparticles by enhanced coagulation. Water Science and Technology. 2021; 84 (2):484-498.

Chicago/Turabian Style

Zhaoyang You; Changrong Zhao; Yongjun Sun; Chang Zhuang. 2021. "Application of PAFC/CPAM for the removal of ZnO nanoparticles by enhanced coagulation." Water Science and Technology 84, no. 2: 484-498.

Journal article
Published: 07 May 2021 in Separation and Purification Technology
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Confining metal oxide nanoparticles (NPs) in carriers such as carbon nanotubes (CNTs) has become a novel strategy for designing highly efficient and stable non-noble metal chainmail catalysts. In this study, Fe3O4 NPs were confined in the chainmail of multi-walled CNTs to prepare [email protected] magnetic nanocomposite with confinement effect, and peroxydisulfate (PDS) was activated to degrade tetracycline (TL) in aqueous solution. Under the conditions of 20 °C, pH0=7, 0.5 mM PDS and 0.4 g/L [email protected], TL degradation efficiency of 98.1% could be achieved by radicals (•OH, SO4•-, O2•-) and non-radicals (1O2) generated in the system. Stable carbon-layer structure can protect Fe3O4 NPs inside the chainmail from the influence of reaction environment. TL degradation efficiency still reached 80.2% after five cycles, and the leaching of Fe ions was less than 10 μg/L during each cycle. Electrochemical analysis and density functional theory (DFT) calculations show that electron transfer from active Fe3O4 NPs to the carbon layer to motivate the catalytic activity of carbon surface. This work will provide an innovative path for the application of chainmail catalysts in nano-water environmental remediation.

ACS Style

Biming Liu; Wenbin Song; Wenwen Zhang; Xiao Zhang; Shunlong Pan; Haixia Wu; Yongjun Sun; Yanhua Xu. [email protected] as a high-effective and steady chainmail catalyst for tetracycline degradation with peroxydisulfate activation: Performance and mechanism. Separation and Purification Technology 2021, 273, 118705 .

AMA Style

Biming Liu, Wenbin Song, Wenwen Zhang, Xiao Zhang, Shunlong Pan, Haixia Wu, Yongjun Sun, Yanhua Xu. [email protected] as a high-effective and steady chainmail catalyst for tetracycline degradation with peroxydisulfate activation: Performance and mechanism. Separation and Purification Technology. 2021; 273 ():118705.

Chicago/Turabian Style

Biming Liu; Wenbin Song; Wenwen Zhang; Xiao Zhang; Shunlong Pan; Haixia Wu; Yongjun Sun; Yanhua Xu. 2021. "[email protected] as a high-effective and steady chainmail catalyst for tetracycline degradation with peroxydisulfate activation: Performance and mechanism." Separation and Purification Technology 273, no. : 118705.

Journal article
Published: 08 April 2021 in Journal of Cleaner Production
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The solid-liquid separation ability of adsorbents is of great significance for improving the recovery efficiency and reducing the cost. Herein, a novel floating-magnetically responsive silica adsorbent (FMSA) was prepared and applied to the adsorption of cationic dyes from aqueous solution. FMSA with self-floating and magnetic response properties exhibited great solid-liquid separation ability and adsorption performance for cationic dyes. According to the Langmuir model, the theoretical saturated adsorption capacity of FMSA for Basic Blue 7 (BB-7) and Crystal Violet (CV) reached 1632.55 mg g−1 and 1587.23 mg g−1, respectively. Thermodynamic experiments manifested that the adsorption was a spontaneous endothermic process with increasing entropy. After 5 adsorption-desorption processes, FMSA’s adsorption capacity for BB-7 and CV remained above 80%, indicating that it has satisfactory stability and reusability. Furthermore, the pH effect, isotherm, kinetics, ion interference experiments and characterization analysis manifested that the adsorption was mainly chemical adsorption with an ion exchange process. This research aims to bring some inspiration for the combined use of floating separation and magnetic separation to achieve more flexible, efficient and energy-saving solid-liquid separation.

ACS Style

Chao Hu; Huaili Zheng; Rui Zhao; Shixin Zhang; Qiang Sun; Junyi Jiang; Yongjun Sun. Structural design of a floating-magnetically responsive silica adsorbent and efficient removal of dyes. Journal of Cleaner Production 2021, 302, 126985 .

AMA Style

Chao Hu, Huaili Zheng, Rui Zhao, Shixin Zhang, Qiang Sun, Junyi Jiang, Yongjun Sun. Structural design of a floating-magnetically responsive silica adsorbent and efficient removal of dyes. Journal of Cleaner Production. 2021; 302 ():126985.

Chicago/Turabian Style

Chao Hu; Huaili Zheng; Rui Zhao; Shixin Zhang; Qiang Sun; Junyi Jiang; Yongjun Sun. 2021. "Structural design of a floating-magnetically responsive silica adsorbent and efficient removal of dyes." Journal of Cleaner Production 302, no. : 126985.

Journal article
Published: 28 March 2021 in Separation and Purification Technology
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Two bioflocculants of starch-graft-P[acrylamide-acrylic acid] (SAA) and starch-graft-P[acrylamide-2-acacrylamido-2-methyl-1-propanesulfonic acid] (SAS) are designed for the flocculation–chelation of heavy metals. The successful polymer synthesis is confirmed through physicochemical characterization. SAA and SAS are used to remove Cu(II), Zn(II), and Ni(II) from simulated wastewater and Ni(II) from actual electroplating wastewater. The removal efficiencies for Cu(II), Zn(II), and Ni(II) in the simulated wastewater by SAA and SAS are more than 80.00%, whereas those for Ni(II) are more than 90.0% in the Ni-containing electroplating wastewater at the optimal condition. Flocculation experiments reveal that the sulfonate structure of SAS is highly conducive to improve flocculation efficiency. SAA and SAS have high selectivities for Cu(II) in the simulated water sample with mixed heavy metal. Finally, the 3E (i.e., environmental impact, economic benefit, and energy consumption) triangular evaluation model is established to evaluate the flocculation experiments for the removal of heavy metal ions using SAA and SAS.

ACS Style

Xuefeng Xiao; Yongjun Sun; Jianwen Liu; Huaili Zheng. Flocculation of heavy metal by functionalized starch-based bioflocculants: Characterization and process evaluation. Separation and Purification Technology 2021, 267, 118628 .

AMA Style

Xuefeng Xiao, Yongjun Sun, Jianwen Liu, Huaili Zheng. Flocculation of heavy metal by functionalized starch-based bioflocculants: Characterization and process evaluation. Separation and Purification Technology. 2021; 267 ():118628.

Chicago/Turabian Style

Xuefeng Xiao; Yongjun Sun; Jianwen Liu; Huaili Zheng. 2021. "Flocculation of heavy metal by functionalized starch-based bioflocculants: Characterization and process evaluation." Separation and Purification Technology 267, no. : 118628.

Journal article
Published: 03 March 2021 in Carbohydrate Polymers
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In this study, three magnetic flocculants, namely, MC, MC-g-PAM, and MC-g-PAA, were prepared. The structure characteristics, flocculation performance, and floc characteristics of the three magnetic flocculants were systematically studied and compared. SEM, FT-IR, XPS, XRD, TG–DSC, and VSM characterization results show that MC, MC-g-PAM, and MC-g-PAA are successfully prepared and exhibit good magnetic induction. The removal rates of copper ions by MC, MC-g-PAM, and MC-g-PAA under the optimal coagulation conditions are 93.39 %, 88.64 %, and 61.41 %, respectively. Kinetic fitting shows that the flocculation reaction process of MC and MC-g-PAM conforms to pseudo first-order kinetics, while the flocculation reaction process of MC-g-PAA conforms to pseudo second-order kinetics. The flocs produced by MC-g-PAA have larger particle size and fractal dimension than those by MC and MC-g-PAM. At 80 mg/L dosage and pH 6, the floc size and floc fractal dimension obtained by MC-g-PAA reach the maximum values of 48.28 um and 1.468, respectively. Zeta potential studies show that the flocculation functions of the three flocculants are mainly adsorption bridging, adsorption electric neutralization, and chelating precipitation. Recycling experiments show that MC-g-PAA has good recyclability, and the recovery rate after the fifth use is 77.24 % with the Cu(II) removal rate of 67.53 %.

ACS Style

Yongjun Sun; Yuanyuan Yu; Xing Zheng; Aowen Chen; Huaili Zheng. Magnetic flocculation of Cu(II) wastewater by chitosan-based magnetic composite flocculants with recyclable properties. Carbohydrate Polymers 2021, 261, 117891 .

AMA Style

Yongjun Sun, Yuanyuan Yu, Xing Zheng, Aowen Chen, Huaili Zheng. Magnetic flocculation of Cu(II) wastewater by chitosan-based magnetic composite flocculants with recyclable properties. Carbohydrate Polymers. 2021; 261 ():117891.

Chicago/Turabian Style

Yongjun Sun; Yuanyuan Yu; Xing Zheng; Aowen Chen; Huaili Zheng. 2021. "Magnetic flocculation of Cu(II) wastewater by chitosan-based magnetic composite flocculants with recyclable properties." Carbohydrate Polymers 261, no. : 117891.

Review
Published: 01 March 2021 in Environments
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This review systematically outlines the recent advances in the application of circular bioeconomy technologies for converting agricultural wastewater to value-added resources. The properties and applications of the value-added products from agricultural wastewater are first summarized. Various types of agricultural wastewater, such as piggery wastewater and digestate from anaerobic digestion, are focused on. Next, different types of circular technologies for recovery of humic substances (e.g., humin, humic acids and fulvic acids) and nutrients (e.g., nitrogen and phosphorus) from agricultural wastewater are reviewed and discussed. Advanced technologies, such as chemical precipitation, membrane separation and electrokinetic separation, are evaluated. The environmental benefits of the circular technologies compared to conventional wastewater treatment processes are also addressed. Lastly, the perspectives and prospects of the circular technologies for agricultural wastewater are provided.

ACS Style

Nidhi Mehta; Kinjal Shah; Yu-I Lin; Yongjun Sun; Shu-Yuan Pan. Advances in Circular Bioeconomy Technologies: From Agricultural Wastewater to Value-Added Resources. Environments 2021, 8, 20 .

AMA Style

Nidhi Mehta, Kinjal Shah, Yu-I Lin, Yongjun Sun, Shu-Yuan Pan. Advances in Circular Bioeconomy Technologies: From Agricultural Wastewater to Value-Added Resources. Environments. 2021; 8 (3):20.

Chicago/Turabian Style

Nidhi Mehta; Kinjal Shah; Yu-I Lin; Yongjun Sun; Shu-Yuan Pan. 2021. "Advances in Circular Bioeconomy Technologies: From Agricultural Wastewater to Value-Added Resources." Environments 8, no. 3: 20.

Journal article
Published: 24 February 2021 in Journal of Environmental Sciences
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In this study, three magnetic flocculants with different chelating groups, namely, carboxymethyl chitosan-modified Fe3O4 flocculant (MC), acrylamide-grafted magnetic carboxymethyl chitosan flocculant (MCM), and 2-acrylamide-2-methylpropanesulfonic acid copolyacrylamide-grafted magnetic carboxymethyl chitosan flocculant (MCAA) were prepared, synthesized, and characterized by photopolymerization technology. They were applied to the flocculation removal of Cr(III), Co(II), and Pb(II). The effect of flocculation condition on the removal performance of Cr(III), Co(II), and Pb(II) was studied. Characterization results show that the three magnetic carboxymethyl chitosan-based flocculants have been successfully prepared with good magnetic induction properties. Flocculation results show that the removal rates of MC, MCM, and MCAA on Cr(III) are 51.79%, 82.33%, and 91.42%, respectively, under the conditions of 80 mg/L flocculant, pH value of 6, reaction time of 1.5 hr, G value of 200 s−1, and precipitation magnetic field strength of 120 mT. The removal rates of Co(II) by MC, MCM, and MCAA are 54.33%, 84.99%, and 90.49%, respectively. The removal rates of Pb(II) by MC, MCM, and MCAA are 61.54%, 91.32%, and 95.74%, respectively. MCAA shows good flocculation performance in composite heavy metal-simulated wastewater. The magnetic carboxymethyl chitosan-based flocculant shows excellent flocculation performance in removing soluble heavy metals. This research provides guidance and ideas for the development of efficient and low-cost flocculation technology to remove heavy metals in wastewater.

ACS Style

Xuefeng Xiao; Yuanyuan Yu; Yongjun Sun; Xing Zheng; Aowen Chen. Heavy metal removal from aqueous solutions by chitosan-based magnetic composite flocculants. Journal of Environmental Sciences 2021, 108, 22 -32.

AMA Style

Xuefeng Xiao, Yuanyuan Yu, Yongjun Sun, Xing Zheng, Aowen Chen. Heavy metal removal from aqueous solutions by chitosan-based magnetic composite flocculants. Journal of Environmental Sciences. 2021; 108 ():22-32.

Chicago/Turabian Style

Xuefeng Xiao; Yuanyuan Yu; Yongjun Sun; Xing Zheng; Aowen Chen. 2021. "Heavy metal removal from aqueous solutions by chitosan-based magnetic composite flocculants." Journal of Environmental Sciences 108, no. : 22-32.

Journal article
Published: 19 February 2021 in Chemical Engineering Journal
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In this study, the ion-exchange resin (D201) was modified with hydrous lanthanum oxide (HLO) to prepare the sorption material HLO-modified resin (LMR), which was used to simultaneous removal of various nutrients containing nitrogen (N) and phosphorus (P) from eutrophic water (e.g., nitrate (NO3‾–N), nitrite (NO2‾–N), orthophosphate (OP), pyrophosphate (PP) and myo-inositol hexakisphosphate (IP)). Characterization analysis demonstrated that HLO was successfully immobilized in a porous structure with abundant quaternary ammonium groups in the form of crystalline hydrated oxide. The batch experiments systematically studied the effectiveness of LMR on the adsorption of N and P multicomponent pollutants, and the maximum adsorption capacities of LMR for NO3‾–N, NO2‾–N, OP, PP and IP were 35.0 mg N/g, 38.3 mg N/g, 50.5 mg P/g, 53.3 mg P/g, and 14.7 mg P/g, respectively. Moreover, LMR can complete the effective separation of N and P species from aqueous solution within a wide pH range (3–11) and can still maintain good removal performance and selectivity for objective pollutants in a complex environment. Results of density functional theory (DFT) calculations indicated that the highest occupied molecular orbital energy and dipole moment of different species were highly correlated with their adsorption process. Notably, after 10 adsorption/desorption cycles, LMR retained >75% of the adsorption capacity for N and P species. The application of LMR in a fixed-bed column proved to be an effective application-oriented environmental functional material for the simultaneous adsorption of N and P species. Overall, this work provided the possibility to effectively solve the eutrophic problem of water bodies.

ACS Style

Biming Liu; Zhenxue Liu; Haixia Wu; Shunlong Pan; Yongjun Sun; Yanhua Xu. Insight into simultaneous selective removal of nitrogen and phosphorus species by lanthanum-modified porous polymer: Performance, mechanism and application. Chemical Engineering Journal 2021, 415, 129026 .

AMA Style

Biming Liu, Zhenxue Liu, Haixia Wu, Shunlong Pan, Yongjun Sun, Yanhua Xu. Insight into simultaneous selective removal of nitrogen and phosphorus species by lanthanum-modified porous polymer: Performance, mechanism and application. Chemical Engineering Journal. 2021; 415 ():129026.

Chicago/Turabian Style

Biming Liu; Zhenxue Liu; Haixia Wu; Shunlong Pan; Yongjun Sun; Yanhua Xu. 2021. "Insight into simultaneous selective removal of nitrogen and phosphorus species by lanthanum-modified porous polymer: Performance, mechanism and application." Chemical Engineering Journal 415, no. : 129026.

Journal article
Published: 31 December 2020 in Separation and Purification Technology
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In this study, spinel-type MnFe2O4 magnetic nanoparticles were successfully synthesized employing the purified sol-gel method and used for the advanced treatment of biologically pretreated semi-coking wastewater (BPSCW) by the O3/H2O2 catalytic system. Results showed that the MnFe2O4 magnetic catalysts did not have a regular surface morphology, and their surface contained numerous fine particles that showed a particle accumulation state and formed a good nano-spinel structure. Their surface morphology, ratio, size, and X-ray photoelectron spectroscopy revealed two active metal elements in the catalyst, namely, Fe3+ and Mn2+, which were consistent with the elemental composition and valence of MnFe2O4. Under optimal reaction conditions, the removal efficiency of O3/H2O2/MnFe2O4 catalytic system for chemical oxygen demand (COD) and volatile phenol (VP) can reach 85.2% and 94.1%, respectively (catalyst dosage = 2.0 g∙L−1, O3 dosage = 1.2 mg∙min−1, H2O2 concentration = 0.15 mol∙L−1, pH = 7.0, and treatment time = 70 min). The free radical quenching experiment and electron paramagnetic resonance (EPR) experiment verified that hydroxyl radicals (∙OH) played a role in the deep treatment of BPSCW in the O3/H2O2/MnFe2O4 catalytic system. Phosphate experiments proved that lewis acid sites on the surface of the MnFe2O4 magnetic catalysts were the catalytically active sites. The superparamagnetic properties of the MnFe2O4 magnetic catalysts (67.8 emu∙g−1) facilitated magnetic separation from the treated wastewater. After 10 cycles, the activity of the MnFe2O4 magnetic catalysts remained high, and the removal efficiencies of COD and VP only decreased by 13.6% and 11.9%, respectively. Considering excellent degradation performance, easy magnetic separation and high stability, this study provided important insights into the practical application of the O3/H2O2 catalytic system for the advanced treatment of BPSCW.

ACS Style

Zhiying Liu; Yue Teng; Yanhua Xu; Yuqi Zheng; Yun Zhang; Mingxin Zhu; Yongjun Sun. Ozone Catalytic Oxidation of Biologically Pretreated Semi-Coking Wastewater (BPSCW) by Spinel-type MnFe2O4 Magnetic Nanoparticles. Separation and Purification Technology 2020, 118277 .

AMA Style

Zhiying Liu, Yue Teng, Yanhua Xu, Yuqi Zheng, Yun Zhang, Mingxin Zhu, Yongjun Sun. Ozone Catalytic Oxidation of Biologically Pretreated Semi-Coking Wastewater (BPSCW) by Spinel-type MnFe2O4 Magnetic Nanoparticles. Separation and Purification Technology. 2020; ():118277.

Chicago/Turabian Style

Zhiying Liu; Yue Teng; Yanhua Xu; Yuqi Zheng; Yun Zhang; Mingxin Zhu; Yongjun Sun. 2020. "Ozone Catalytic Oxidation of Biologically Pretreated Semi-Coking Wastewater (BPSCW) by Spinel-type MnFe2O4 Magnetic Nanoparticles." Separation and Purification Technology , no. : 118277.

Journal article
Published: 08 December 2020 in Science of The Total Environment
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Developing robust and effective adsorbent for removing ubiquitous pharmaceutical diclofenac (DCF) from the aquatic environment is vitally important for environmental safety. Hence, a novel chitosan-based multilayer adsorbent (FCS-PD) with magnetic separation ability and surface functionality was successfully assembled, which had countless potential for removing contaminants from water. A series of instrumental technologies were performed to demonstrate the physicochemical properties of FCS-PD. Its adsorption performance towards DCF removal was comprehensively evaluated in synthetic water and surface water. The effects of microplastics, inorganic ions and humic acid on the adsorption were investigated. The maximum adsorption capacity of FCS-PD was calculated as 434.78 mg/g under neutral conditions, exhibiting superior adsorption performance than most reported adsorbents. The DCF in surface water was practically completely removed at low concentration (50 μg/L). FCS-PD presented a multistage kinetics controlled by chemisorption and intraparticle diffusion, which was emphasized by the pseudo-second-order kinetic and intra-particle diffusion analysis. After five cycles of adsorption and regeneration, the adsorption capacity only decreased by 9.9%, indicating the satisfactory regeneration of FCS-PD. The analysis of high-resolution X-ray photoelectron spectroscopic (XPS) and Fourier transform infrared spectroscopy (FTIR) revealed that the quaternary ammonium groups on the outer layer and the amino and hydroxyl groups on the chitosan layer are involved in the capture of DCF under electrostatic force and hydrogen bonding.

ACS Style

Rui Zhao; Huaili Zheng; Zheng Zhong; Chun Zhao; Yongjun Sun; Yaoyao Huang; Xinyu Zheng. Efficient removal of diclofenac from surface water by the functionalized multilayer magnetic adsorbent: Kinetics and mechanism. Science of The Total Environment 2020, 760, 144307 .

AMA Style

Rui Zhao, Huaili Zheng, Zheng Zhong, Chun Zhao, Yongjun Sun, Yaoyao Huang, Xinyu Zheng. Efficient removal of diclofenac from surface water by the functionalized multilayer magnetic adsorbent: Kinetics and mechanism. Science of The Total Environment. 2020; 760 ():144307.

Chicago/Turabian Style

Rui Zhao; Huaili Zheng; Zheng Zhong; Chun Zhao; Yongjun Sun; Yaoyao Huang; Xinyu Zheng. 2020. "Efficient removal of diclofenac from surface water by the functionalized multilayer magnetic adsorbent: Kinetics and mechanism." Science of The Total Environment 760, no. : 144307.

Research article
Published: 03 November 2020 in Environmental Science and Pollution Research
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Municipal wastewater treatment plants (WWTPs) are considered to be major contributors of microplastics to the aquatic environment. Detailed research in China, which is relevant to the local situation, remains in the initial stage. Herein, the microplastic abundance, morphology, and removal efficiency of two WWTPs (C and P) equipped with tertiary treatment processes in different districts of Nanjing, an important city in the Yangtze River Basin, were investigated. The influence of technology, operational parameters, daily capacity, and sewage source and its proportion were discussed. Observations by optical microscope and FT-IR analysis and systematic calculation revealed that the microplastics have four shapes, including fragments, granules, film, and fibers, with various sizes and proportions, which were dependent on wastewater source. The total removal rates of 97.67% and 98.46% for WWTP C and WWTP P, respectively, indicated their highly efficient reduction of microplastics. Treatment technology had a considerable influence on the removal rate, especially the secondary and tertiary processes. However, a large number of microplastics from WWTPs were still released into the environmental waters due to the huge daily capacity. Sewage source determined the concentration, morphology feature, and chemical composition of microplastics to a certain extent. Compared with industrial wastewater, domestic wastewater possibly contained smaller microplastics of polyethylene and polypropylene with lower abundance. Furthermore, additional attention was provided on the flocculation process, drainage system, and treatment efficiency of microplastics with different shapes. This work is expected to provide some technical supports to guide the operation and management of WWTPs.

ACS Style

Fang Yuan; Han Zhao; Haibing Sun; Jinhui Zhao; Yongjun Sun. Abundance, morphology, and removal efficiency of microplastics in two wastewater treatment plants in Nanjing, China. Environmental Science and Pollution Research 2020, 28, 9327 -9337.

AMA Style

Fang Yuan, Han Zhao, Haibing Sun, Jinhui Zhao, Yongjun Sun. Abundance, morphology, and removal efficiency of microplastics in two wastewater treatment plants in Nanjing, China. Environmental Science and Pollution Research. 2020; 28 (8):9327-9337.

Chicago/Turabian Style

Fang Yuan; Han Zhao; Haibing Sun; Jinhui Zhao; Yongjun Sun. 2020. "Abundance, morphology, and removal efficiency of microplastics in two wastewater treatment plants in Nanjing, China." Environmental Science and Pollution Research 28, no. 8: 9327-9337.

Journal article
Published: 02 November 2020 in Journal of Environmental Chemical Engineering
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The preparation of [email protected]γ-Al2O3 3D particle electrode was studied, and the preparation process was optimized on the basis of its electrolytic performance and treatment efficiency on coal chemical wastewater. Infrared spectroscopy, X-ray fluorescence, scanning electron microscopy, X-ray diffraction, and energy dispersive X-ray spectroscopy were used to characterize the loaded element, element morphology, and micromorphology of [email protected]γ-Al2O3 3D particle electrode. Results show that the optimal conditions for the preparation of [email protected]γ-Al2O3 3D particle electrode are as follows: Ti:Ag:W = 10:10:5, the calcination temperature of the particle electrode is 450 ℃, and the number of times of loading is twice. Coal chemical wastewater degradation was significantly influenced by operating conditions. The research on particle electrode regeneration and stability shows good electrolysis performance after four electrolysis procedures. The effects of conductivity, pH, current intensity, aeration, plate spacing, and filling degree on the removal efficiency of chemical oxygen demand (COD), ammonia nitrogen, and total phenol by [email protected]γ-Al2O3 particle electrode were studied. Under the optimal optimization conditions, the COD removal rate was 67.6%, the ammonia nitrogen removal rate was 42.8%, and the total phenol removal rate was 51.7%. Three dimensional electrocatalytic system shows good degradation ability and capacity.

ACS Style

Wenquan Suna; Shengbao Zhoua; Yongjun Suna; Yanhua Xub; Huaili Zhengc. [email protected]γ-Al2O3 particle electrodes for enhanced electrocatalytic pretreatment of coal chemical wastewater. Journal of Environmental Chemical Engineering 2020, 9, 104681 .

AMA Style

Wenquan Suna, Shengbao Zhoua, Yongjun Suna, Yanhua Xub, Huaili Zhengc. [email protected]γ-Al2O3 particle electrodes for enhanced electrocatalytic pretreatment of coal chemical wastewater. Journal of Environmental Chemical Engineering. 2020; 9 (1):104681.

Chicago/Turabian Style

Wenquan Suna; Shengbao Zhoua; Yongjun Suna; Yanhua Xub; Huaili Zhengc. 2020. "[email protected]γ-Al2O3 particle electrodes for enhanced electrocatalytic pretreatment of coal chemical wastewater." Journal of Environmental Chemical Engineering 9, no. 1: 104681.

Journal article
Published: 30 October 2020 in Separation and Purification Technology
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Mn/MCM-41 and imp-Mn/MCM-41 catalysts were prepared in this study through metal heteroatom substitution and impregnation methods, respectively, and their catalytic oxidation performance of toluene under non-thermal plasma (NTP) in a dielectric barrier discharge reactor was studied. The stability of the catalyst and the parameters of catalytic oxidation conditions (initial concentration of toluene, O2 ratio, and relative humidity of carrier gas) were optimized. Characterization proved that the impregnation method resulted in the existence of manganese in the form of oxides (MnO2, Mn2O3) outside the pores of MCM-41. Meanwhile, the metal heteroatom substitution method implanted manganese into the mesoporous structure and replaced part of it with Si-O-Mn. NTP catalytic oxidation of toluene, ozone emission, and GC–MS by-product analysis confirmed that 60Mn/MCM-41 catalyst has high catalytic activity. Moreover, the catalyst affected the production of by-products. The stability test revealed that the 60Mn/MCM-41 catalyst still respectively reached 84.6% and 61% in the conversion of toluene and the selectivity of CO2 under the SED of 558 J/L after 40 h discharge reaction.

ACS Style

Xiao Zhang; Bin Ren; Yanhua Xu; Xi Li; Peng Yu; Yongjun Sun; Huaili Zheng. Catalytic oxidation of toluene in air using manganese incorporated catalyst by non-thermal plasma system. Separation and Purification Technology 2020, 257, 117973 .

AMA Style

Xiao Zhang, Bin Ren, Yanhua Xu, Xi Li, Peng Yu, Yongjun Sun, Huaili Zheng. Catalytic oxidation of toluene in air using manganese incorporated catalyst by non-thermal plasma system. Separation and Purification Technology. 2020; 257 ():117973.

Chicago/Turabian Style

Xiao Zhang; Bin Ren; Yanhua Xu; Xi Li; Peng Yu; Yongjun Sun; Huaili Zheng. 2020. "Catalytic oxidation of toluene in air using manganese incorporated catalyst by non-thermal plasma system." Separation and Purification Technology 257, no. : 117973.

Review
Published: 26 October 2020 in Environmental Science and Pollution Research
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Discharge plasma technology is a new advanced oxidation technology for water treatment, which includes the effects of free radical oxidation, high energy electron radiation, ultraviolet light hydrolysis, and pyrolysis. In order to improve the energy efficiency in the plasma discharge processes, many efforts have been made to combine catalysts with discharge plasma technology. Some heterogeneous catalysts (e.g., activated carbon, zeolite, TiO2) and homogeneous catalysts (e.g., Fe2+/Fe3+, etc.) have been used to enhance the removal of pollutants by discharge plasma. In addition, some reagents of in situ chemical oxidation (ISCO) such as persulfate and percarbonate are also discussed. This article introduces the research progress of the combined systems of discharge plasma and catalysts/oxidants, and explains the different reaction mechanisms. In addition, physical and chemical changes in the plasma catalytic oxidation system, such as the effect of the discharge process on the catalyst, and the changes in the discharge state and solution conditions caused by the catalysts/oxidants, were also investigated. At the same time, the potential advantages of this system in the treatment of different organic wastewater were briefly reviewed, covering the degradation of phenolic pollutants, dyes, and pharmaceuticals and personal care products. Finally, some suggestions for future water treatment technology of discharge plasma are put forward. This review aims to provide researchers with a deeper understanding of plasma catalytic oxidation system and looks forward to further development of its application in water treatment.

ACS Style

Jiawei Fan; Haixia Wu; Ruoyu Liu; Liyuan Meng; Yongjun Sun. Review on the treatment of organic wastewater by discharge plasma combined with oxidants and catalysts. Environmental Science and Pollution Research 2020, 28, 2522 -2548.

AMA Style

Jiawei Fan, Haixia Wu, Ruoyu Liu, Liyuan Meng, Yongjun Sun. Review on the treatment of organic wastewater by discharge plasma combined with oxidants and catalysts. Environmental Science and Pollution Research. 2020; 28 (3):2522-2548.

Chicago/Turabian Style

Jiawei Fan; Haixia Wu; Ruoyu Liu; Liyuan Meng; Yongjun Sun. 2020. "Review on the treatment of organic wastewater by discharge plasma combined with oxidants and catalysts." Environmental Science and Pollution Research 28, no. 3: 2522-2548.

Journal article
Published: 30 August 2020 in Separation and Purification Technology
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In this study, co-precipitation was used to prepare Fe3O4 magnetic powder activated carbon (PAC) (Fe3O4-PAC) and MnFe2O4 magnetic PAC (MnFe2O4-PAC) for the in-depth treatment of glyphosate pesticide wastewater. Magnetic adsorbent characterization results indicate that MnFe2O4 was successfully loaded on the activated carbon powder. Adsorption experiment results show that the maximum adsorption capacity of MnFe2O4-PAC for glyphosate is two to three times that of the original PAC. The adsorption of glyphosate by using magnetic PAC conforms to the Langmuir adsorption isotherm, and the adsorption kinetics is consistent with the quasi-second adsorption kinetic model. The adsorption capacity of Fe3O4-PAC and MnFe2O4-PAC showed the same trend effect with the change in pH, temperature, and adsorbent dosage. The adsorption capacity of Fe3O4-PAC and MnFe2O4-PAC for glyphosate decreased with the increase in pH and magnetic PAC and rises with temperature. Regeneration experiment results showed that the order of the regeneration method of MnFe2O4-PAC is: microwave combined Fenton reagent regeneration> wet microwave regeneration> microwave combined hydrogen peroxide regeneration. MnFe2O4-PAC after regeneration still exhibited good magnetic properties and adsorption capacity.

ACS Style

Peng Yu; Xi Li; Xiao Zhang; Hui Zhou; Yanhua Xu; Yongjun Sun; Huaili Zheng. Insights into the glyphosate removal efficiency by using magnetic powder activated carbon composite. Separation and Purification Technology 2020, 254, 117662 .

AMA Style

Peng Yu, Xi Li, Xiao Zhang, Hui Zhou, Yanhua Xu, Yongjun Sun, Huaili Zheng. Insights into the glyphosate removal efficiency by using magnetic powder activated carbon composite. Separation and Purification Technology. 2020; 254 ():117662.

Chicago/Turabian Style

Peng Yu; Xi Li; Xiao Zhang; Hui Zhou; Yanhua Xu; Yongjun Sun; Huaili Zheng. 2020. "Insights into the glyphosate removal efficiency by using magnetic powder activated carbon composite." Separation and Purification Technology 254, no. : 117662.

Journal article
Published: 29 August 2020 in Journal of Molecular Liquids
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In order to deal with the increasingly serious water pollution caused by dye wastewater, a novel sulfonic acid-modified polyacrylamide magnetic composite ([email protected]/P(AM-AMPS)) was facilely prepared by crosslink reaction. The physicochemical properties and adsorption performances of [email protected]/P(AM-AMPS) were systematically studied by different characterization techniques and a series of batch experiments, respectively. It was found that the adsorption capacities of [email protected]/P(AM-AMPS) towards cationic dyes crystal violet (CV) and methylene blue (MB) were largely enhanced than those of silica-coated Fe3O4 ([email protected]) and maintained at relatively high levels in a wide pH range, due to the three-dimensional network structure and abundant functional groups of modified polyacrylamide. Besides, owing to the introduction of [email protected], [email protected]/P(AM-AMPS) presented a unique magnetic property that helped it to be rapidly separated from water in a magnetic field. The maximum adsorption capacities of [email protected]/P(AM-AMPS) were 2106.37 mg g−1 for CV removal and 1462.34 mg g−1 for MB removal at 298.15 K, much higher than those of other reported magnetic composites. Furthermore, [email protected]/P(AM-AMPS) was effectively regenerated with HCl solution and the regeneration rates were higher than 97% and 80% for CV and MB removal after five adsorption-desorption cycles, respectively. With its excellent adsorption capacity, wide pH applicability, high separation speed, and satisfactory regeneration ability, [email protected]/P(AM-AMPS) was expected to become a promising adsorbent in the purification of cationic dye wastewater.

ACS Style

Xinyu Zheng; Huaili Zheng; Rui Zhao; Zikang Xiong; Yili Wang; Yongjun Sun; Wei Ding. Sulfonic acid-modified polyacrylamide magnetic composite with wide pH applicability for efficient removal of cationic dyes. Journal of Molecular Liquids 2020, 319, 114161 .

AMA Style

Xinyu Zheng, Huaili Zheng, Rui Zhao, Zikang Xiong, Yili Wang, Yongjun Sun, Wei Ding. Sulfonic acid-modified polyacrylamide magnetic composite with wide pH applicability for efficient removal of cationic dyes. Journal of Molecular Liquids. 2020; 319 ():114161.

Chicago/Turabian Style

Xinyu Zheng; Huaili Zheng; Rui Zhao; Zikang Xiong; Yili Wang; Yongjun Sun; Wei Ding. 2020. "Sulfonic acid-modified polyacrylamide magnetic composite with wide pH applicability for efficient removal of cationic dyes." Journal of Molecular Liquids 319, no. : 114161.