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Various advanced microwave absorbing materials have been developed for reducing/avoiding the harm of microwave radiation. Among them, core-shell structural nanomaterials have been widely fabricated for microwave absorption. However, the “structure-performance” relationship between shell thickness and microwave absorption performance is rarely reported. In this paper, we first explored the “structure-performance” relationship between shell thickness and microwave absorption performance, based on the core-shell α[email protected] nanoparticles with a constant α-Fe2O3-core size and changeable SiO2-shell thickness. With increasing the SiO2-shell thickness, the microwave absorption ability first increased, then decreased. Under a proper SiO2-shell thickness of 35 nm, α[email protected] sample achieved the strongest microwave absorbing ability with a reflection loss minimum value of –4.3 dB, better than that of pure α-Fe2O3 (–3.8 dB). This enhanced microwave absorption performance was mainly derived from the dielectric loss. Although the absolute value of the reflection loss was relatively low (-4.3 dB), this study shed an important reference on designing next-generation advanced iron oxide-based materials for microwave absorption.
Honghong Fu; Yue Guo; Jian Yu; Zhen Shen; Jie Zhao; Yu Xie; Yun Ling; Sheng Ouyang; Shiqi Li; Wei Zhang. Tuning the shell thickness of core-shell α[email protected] nanoparticles to promote microwave absorption. Chinese Chemical Letters 2021, 1 .
AMA StyleHonghong Fu, Yue Guo, Jian Yu, Zhen Shen, Jie Zhao, Yu Xie, Yun Ling, Sheng Ouyang, Shiqi Li, Wei Zhang. Tuning the shell thickness of core-shell α[email protected] nanoparticles to promote microwave absorption. Chinese Chemical Letters. 2021; ():1.
Chicago/Turabian StyleHonghong Fu; Yue Guo; Jian Yu; Zhen Shen; Jie Zhao; Yu Xie; Yun Ling; Sheng Ouyang; Shiqi Li; Wei Zhang. 2021. "Tuning the shell thickness of core-shell α[email protected] nanoparticles to promote microwave absorption." Chinese Chemical Letters , no. : 1.
Microplastics are ubiquitous in aquatic environments and interact with other kinds of pollutants, which affects the migration, transformation, and fate of those other pollutants. In this study, we employ carbamazepine (CBZ) as the contaminant to study the influence of polyethylene (PE) microplastics on the adsorption of CBZ pollutants by multiwalled carbon nanotubes (MCNTs) in aqueous solution. The adsorption capacity of CBZ by MCNTs in the presence of PE microplastics was obviously lower than that by MCNTs alone. The influencing factors, including the dose of microplastics, pH, and CBZ solution concentration, on the adsorption of CBZ by MCNTs and MCNTs−PE were thoroughly investigated. The adsorption rate of CBZ by MCNTs decreased from 97.4% to 90.6% as the PE microplastics dose increased from 2 g/L to 20 g/L. This decrease occurred because the MCNTs were coated on the surface of the PE microplastics, which further decreased the effective adsorption area of the MCNTs. This research provides a framework for revealing the effect of microplastics on the adsorption of pollutants by carbon materials in aqueous environments.
Xiaoyu Sheng; Junkai Wang; Wei Zhang; Qiting Zuo. The Potential for PE Microplastics to Affect the Removal of Carbamazepine Medical Pollutants from Aqueous Environments by Multiwalled Carbon Nanotubes. Toxics 2021, 9, 139 .
AMA StyleXiaoyu Sheng, Junkai Wang, Wei Zhang, Qiting Zuo. The Potential for PE Microplastics to Affect the Removal of Carbamazepine Medical Pollutants from Aqueous Environments by Multiwalled Carbon Nanotubes. Toxics. 2021; 9 (6):139.
Chicago/Turabian StyleXiaoyu Sheng; Junkai Wang; Wei Zhang; Qiting Zuo. 2021. "The Potential for PE Microplastics to Affect the Removal of Carbamazepine Medical Pollutants from Aqueous Environments by Multiwalled Carbon Nanotubes." Toxics 9, no. 6: 139.
The considerable amount of Cr(VI) pollutants in the aqueous environment is a significant environmental concern that cannot be ignored. A series of novel Mxene–CS inorganic–organic composite nanomaterials synthesized by using the solution reaction method was applied to treat the Cr(VI) contaminated water. The Mxene–CS composites were characterized through SEM (scanning electron microscope), XRD (X–ray diffraction), XPS (X–ray photoelectron spectroscopy), and FTIR (Fourier transform infrared). The XRD patterns (observed at 2θ of 18.1°, 35.8°, 41.5°, and 60.1°) and the FT–IR spectra (-NH2 group for 1635 and 1517 cm−1, and -OH group for 3482 cm−1) illustrated that CS was successfully loaded on the Mxene. The effects of solution pH, the dosage of Mxene–CS, and duration time on the adsorption of Cr(VI) by synthesized Mxene–CS were investigated. The removal efficiency of Cr(VI) was increased from 12.9% to 40.5% with Mxene–CS dosage ranging from 0.02 to 0.12 g/L. The adsorption process could be well fitted by the pseudo–second–order kinetics model, indicating chemisorption occurred. The Langmuir isotherm model could be better to describe the process with a maximum adsorption capacity of 43.1 mg/g. The prepared novel Mxene–CS composite was considered as an alternative for adsorption of heavy metals from wastewater.
Hongyou Wan; Lan Nan; Huikai Geng; Wei Zhang; Huanhuan Shi. Green Synthesis of A Novel MXene–CS Composite Applied in Treatment of Cr(VI) Contaminated Aqueous Solution. Processes 2021, 9, 524 .
AMA StyleHongyou Wan, Lan Nan, Huikai Geng, Wei Zhang, Huanhuan Shi. Green Synthesis of A Novel MXene–CS Composite Applied in Treatment of Cr(VI) Contaminated Aqueous Solution. Processes. 2021; 9 (3):524.
Chicago/Turabian StyleHongyou Wan; Lan Nan; Huikai Geng; Wei Zhang; Huanhuan Shi. 2021. "Green Synthesis of A Novel MXene–CS Composite Applied in Treatment of Cr(VI) Contaminated Aqueous Solution." Processes 9, no. 3: 524.
The design of advanced electrocatalysts is key for capturing chemically inert CO2 for conversion into value-added products (e.g., fuel) and to effectively mitigate greenhouse gas emissions and energy crisis with high standards of sustainability. However, control of product selectivity at a low overpotential is a challenge. In this work, the electrocatalyzing potential of different single transition metals (including Ti, V, Cr, and Mn) was explored in the CO2 reduction reaction (CRR) based on density functional theory (DFT). The efficiency of CRR was examined for each transition metal in relation to their reaction intermediates (COOH, CO, and CHO) after being embedded into graphyne (GY) systems. Accordingly, embedding Cr into GY is the most efficient option for the CRR to produce CH4 with an ultralow limiting potential of −0.29 V based on reaction energies and barriers. For the hydrogen evolution reaction (HER), CO2 is more advantageous to preferentially occupy the activation site than H2 on Cr-GY to reflect their differences in the adsorption energy (-0.83 vs. −0.38 eV). At the same time, Cr-GY can effectively inhibit the HER in the CRR process with the limiting potential of HER as −0.34 V. The overall results of this research are expected to deliver a new path for the development of low-potential electrocatalysts with high activity and selectivity for reduction of CO2.
Ling Fu; Ran Wang; Chenxu Zhao; Jinrong Huo; Chaozheng He; Ki-Hyun Kim; Wei Zhang. Construction of Cr-embedded graphyne electrocatalyst for highly selective reduction of CO2 to CH4: A DFT study. Chemical Engineering Journal 2021, 414, 128857 .
AMA StyleLing Fu, Ran Wang, Chenxu Zhao, Jinrong Huo, Chaozheng He, Ki-Hyun Kim, Wei Zhang. Construction of Cr-embedded graphyne electrocatalyst for highly selective reduction of CO2 to CH4: A DFT study. Chemical Engineering Journal. 2021; 414 ():128857.
Chicago/Turabian StyleLing Fu; Ran Wang; Chenxu Zhao; Jinrong Huo; Chaozheng He; Ki-Hyun Kim; Wei Zhang. 2021. "Construction of Cr-embedded graphyne electrocatalyst for highly selective reduction of CO2 to CH4: A DFT study." Chemical Engineering Journal 414, no. : 128857.
To enhance the photodegradation ability of CeO2 for organic dyes, an effective strategy is to introduce oxygen vacancies (Vo). In general, the introduced Vo are simultaneously present both on the surface and in the bulk of CeO2. The surface oxygen vacancies (Vo-s) can decrease the band gap, thus enhancing light absorption to produce more photogenerated e− for photodegradation. However, the bulk oxygen vacancies (Vo-b) will inhibit photocatalytic activity by increasing the recombination of photogenerated e− and Vo-b. Therefore, regulating the concentrations of Vo-s to Vo-b is a breakthrough for achieving the best utilization of photogenerated e− during photodegradation. We used an easy hydrothermal method to achieve tunable concentrations of Vo-s to Vo-b in CeO2 nanorods. The optimized CeO2 presents a 70.2% removal of rhodamine B after 120 min of ultraviolet − visible light irradiation, and a superior photodegradation performance of multiple organics. This tuning strategy for Vo also provides guidance for developing other advanced metal-oxide semiconductor photocatalysts for the photodegradation of organic dyes.
Zhen Shen; Yipeng Zhou; Yue Guo; Jie Zhao; Jianhua Song; Yu Xie; Yun Ling; Wei Zhang. Tuning the concentration of surface/bulk oxygen vacancies in CeO2 nanorods to promote highly efficient photodegradation of organic dyes. Chinese Chemical Letters 2021, 1 .
AMA StyleZhen Shen, Yipeng Zhou, Yue Guo, Jie Zhao, Jianhua Song, Yu Xie, Yun Ling, Wei Zhang. Tuning the concentration of surface/bulk oxygen vacancies in CeO2 nanorods to promote highly efficient photodegradation of organic dyes. Chinese Chemical Letters. 2021; ():1.
Chicago/Turabian StyleZhen Shen; Yipeng Zhou; Yue Guo; Jie Zhao; Jianhua Song; Yu Xie; Yun Ling; Wei Zhang. 2021. "Tuning the concentration of surface/bulk oxygen vacancies in CeO2 nanorods to promote highly efficient photodegradation of organic dyes." Chinese Chemical Letters , no. : 1.
This paper proposes a novel method relating to the recycling of waste lead ash originated from procedure of lead alloy production. The spent lead ash was first disposed by acetic acid leaching system, where lead ash structure wrapping impurities would be destroyed. The synthesis of lead oxide products was conducted at a lower temperature of 90 °C. The effect of molar ratio of CH3COOH to lead content of the ash on leaching efficiency was studied through the acetic acid leaching system. The results demonstrate that 84.6% of lead could be obtained in the leaching solution, while merely 0.7% of Fe blend in solution within a leaching time of 120 min. In the stage of lead oxide synthesis from leaching solution, the yield of lead oxide products could reach up to 94.4% when the molar ratio of NaOH to lead in filtrate was 2.5. This novel green method could shed light on the reuse of lead from exhausted ash with a much more convenient and environmentally friendly procedure.
Wei Zhang; Gang Tang; Xiaoqin Xiang; Renyu Wang; Shuangquan Gao; Xinfeng Zhu; Qiting Zuo. A low-cost green approach for synthesis of lead oxide from waste lead ash for use in new lead-acid batteries. Chinese Journal of Chemical Engineering 2018, 27, 1674 -1679.
AMA StyleWei Zhang, Gang Tang, Xiaoqin Xiang, Renyu Wang, Shuangquan Gao, Xinfeng Zhu, Qiting Zuo. A low-cost green approach for synthesis of lead oxide from waste lead ash for use in new lead-acid batteries. Chinese Journal of Chemical Engineering. 2018; 27 (7):1674-1679.
Chicago/Turabian StyleWei Zhang; Gang Tang; Xiaoqin Xiang; Renyu Wang; Shuangquan Gao; Xinfeng Zhu; Qiting Zuo. 2018. "A low-cost green approach for synthesis of lead oxide from waste lead ash for use in new lead-acid batteries." Chinese Journal of Chemical Engineering 27, no. 7: 1674-1679.