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Prof. Ki-Hyun Kim
Department of Civil & Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul, 04763 Republic of Korea

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0 Material engineering
0 Metal-Organic Frameworks (MOFs)
0 Coordination Polymers
0 environmental & biomedical monitoring
0 air quality & Environmental Engineering

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Metal-Organic Frameworks (MOFs)
air quality & Environmental Engineering
Coordination Polymers

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Review article
Published: 17 August 2021 in Journal of Cleaner Production
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The electrochemical applicabilities of graphitic carbon nitride (g-C3N4) are yet confined to a degree (e.g., due possibly to an inherently low electrical conductivity) to contrast its great utility in photocatalytic applications. However, desirable electronic properties along with chemical stability can be achieved through coupling with various conducting substrates or modification of surface properties. The electrocatalytic activity of g-C3N4 was greatly enhanced by doping of hetero atoms, alloying with conducting substrates, noble metals, and other nanostructures. As such, composites of g-C3N4 have attracted widespread attention due to their great potential in environment and energy sectors as electro and photoelectrocatalysts. The electro catalytic applications are diverse enough to include hydrogen evolution reaction (HER), oxygen evolution reaction (OER), oxygen reduction reaction (ORR), fuel cells, supercapacitors and electro/photoelectrochemical sensors. This review presents the basic aspects of various studies on g-C3N4 composites in electro and photoelectrochemical applications such as energy conversion reactions, storage and sensors along with a discussion of their future prospects.

ACS Style

Varsha Raj Govindaraju; Kempahanumakkagari Sureshkumar; Thippeswamy Ramakrishnappa; Sreeramareddygari Muralikrishna; Devaramani Samrat; Ranjith Krishna Pai; Vanish Kumar; Kumar Vikrant; Ki-Hyun Kim. Graphitic carbon nitride composites as electro catalysts: Applications in energy conversion, storage, and sensor systems. Journal of Cleaner Production 2021, 128693 .

AMA Style

Varsha Raj Govindaraju, Kempahanumakkagari Sureshkumar, Thippeswamy Ramakrishnappa, Sreeramareddygari Muralikrishna, Devaramani Samrat, Ranjith Krishna Pai, Vanish Kumar, Kumar Vikrant, Ki-Hyun Kim. Graphitic carbon nitride composites as electro catalysts: Applications in energy conversion, storage, and sensor systems. Journal of Cleaner Production. 2021; ():128693.

Chicago/Turabian Style

Varsha Raj Govindaraju; Kempahanumakkagari Sureshkumar; Thippeswamy Ramakrishnappa; Sreeramareddygari Muralikrishna; Devaramani Samrat; Ranjith Krishna Pai; Vanish Kumar; Kumar Vikrant; Ki-Hyun Kim. 2021. "Graphitic carbon nitride composites as electro catalysts: Applications in energy conversion, storage, and sensor systems." Journal of Cleaner Production , no. : 128693.

Journal article
Published: 16 August 2021 in Separation and Purification Technology
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The effects of moisture on adsorption of gaseous benzene have been investigated using microporous activated carbon (AC). Here, the performance metrics of an AC bed are explored in terms of the interplay between benzene concentrations (1 to 20 Pa) and relative humidity (RH, 0–100%). At lower benzene levels (< 10 Pa), the adsorption capacity of AC bed was affected sensitively by water vapor with its reduction by 27 to 65% at 100% RH (e.g., relative to 0% RH). In contrast, at higher benzene levels (∼20 Pa), such effect was not so evident with only less than 5.3%. A test on the combinatory effects of temperature (25, 40, and 60 ℃) and moisture (100% RH) elucidate the occurrences in performance reduction evident only under high temperature rather than moisture (e.g., regardless of dry or humid) conditions. The isotherm analysis of benzene indicates complex fitting results of microporous AC across varying RH levels. The kinetic analysis further demonstrates that the physical nature of benzene is best explained by the pseudo-first order fitting. The test of temperature-swing cycles between adsorption-desorption clarifies the slightly decreases in the adsorption capacity (reduction of 11.9% at 0% RH and 3.4% at 50% RH) at lower RH levels, although such reduction is prominent (35.5%) at the saturated RH. As a whole, the commercial AC product is verified as an excellent adsorbent for the real-world capture of gaseous benzene even in the presence of competing component like water.

ACS Style

Botao Liu; Sherif A. Younis; Jechan Lee; Jan E. Szulejko; Xiaomin Dou; Ki-Hyun Kim. The competing role of moisture in adsorption of gaseous benzene on microporous carbon. Separation and Purification Technology 2021, 277, 119487 .

AMA Style

Botao Liu, Sherif A. Younis, Jechan Lee, Jan E. Szulejko, Xiaomin Dou, Ki-Hyun Kim. The competing role of moisture in adsorption of gaseous benzene on microporous carbon. Separation and Purification Technology. 2021; 277 ():119487.

Chicago/Turabian Style

Botao Liu; Sherif A. Younis; Jechan Lee; Jan E. Szulejko; Xiaomin Dou; Ki-Hyun Kim. 2021. "The competing role of moisture in adsorption of gaseous benzene on microporous carbon." Separation and Purification Technology 277, no. : 119487.

Review article
Published: 02 August 2021 in Coordination Chemistry Reviews
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Metal-organic framework (MOF)-based materials are recognized as potential media for photo-reductive demineralization of heavy and radioactive metal(loid) pollutants. In this review, the recent progress achieved in the development of MOF-based photocatalysts is highlighted for the photocatalytic reduction of Cr(VI)) and U(VI) metal(loid)s in water based on three key performance metrics such as quantum yield (QE), space–time yield (STY), and figures of merit (FOMs). For such evaluation, particular emphasis has been placed on the effect of modification strategies and inorganic nodes (e.g., Zn, Ti, Zr, Fe, In, Cd, and Cr metal sites). Among the surveyed MOFs, flower-like Zn-MOF/[email protected] nanotube/[email protected][email protected] and MOF-derived g-C3N4 nanosheets were identified as the best performers to detoxify chromium and uranium, respectively. The superiority of these MOF-photocatalysts is attributable to their superior capabilities for photoreduction process (e.g., in terms of electron-hole pair separation mechanisms, metals adsorption, and UV-visible light harvesting). The overall results of this review will help open a new room for the development of the next-generation MOF-based photocatalytic systems (in terms of catalytic activity, upscalability, and photocatalytic stability/reusability) for the efficient reduction of heavy and radioactive metal ions in water under solar light.

ACS Style

Vanish Kumar; Vinamrita Singh; Ki-Hyun Kim; Eilhann E. Kwon; Sherif A. Younis. Metal-organic frameworks for photocatalytic detoxification of chromium and uranium in water. Coordination Chemistry Reviews 2021, 447, 214148 .

AMA Style

Vanish Kumar, Vinamrita Singh, Ki-Hyun Kim, Eilhann E. Kwon, Sherif A. Younis. Metal-organic frameworks for photocatalytic detoxification of chromium and uranium in water. Coordination Chemistry Reviews. 2021; 447 ():214148.

Chicago/Turabian Style

Vanish Kumar; Vinamrita Singh; Ki-Hyun Kim; Eilhann E. Kwon; Sherif A. Younis. 2021. "Metal-organic frameworks for photocatalytic detoxification of chromium and uranium in water." Coordination Chemistry Reviews 447, no. : 214148.

Review article
Published: 19 July 2021 in Environmental Research
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Commercial membranes typically suffer from fouling and wetting during membrane distillation (MD). In contrast, reverse osmosis (RO) can be subject to the fouling issue if applied for highly saline feed solutions containing foulants (e.g., organics, oils, and surfactants). Among the diverse treatment options, the nanomaterial-based membranes have recently gained great interest due to their advantageous properties (e.g., enhanced flux and roughness, better pore size distribution, and higher conductivity). This review focuses on recent advances in the mechanical properties, anti-fouling capabilities, salt rejection, and economic viability of metal oxide (SiO2, TiO2, and ZnO) and carbon nanomaterial (graphene oxide/carbon nanotube)–based membranes. Current challenges in applying nanomaterial-based membranes are also discussed. The study further describes the preparation methods, mechanisms, commercial applications, and economical feasibility of metal oxide– and carbon nanomaterial–based membrane technologies.

ACS Style

Aftab Ahmad Khan; Hubdar Ali Maitlo; Imtiaz Afzal Khan; Daehwan Lim; Ming Zhang; Ki-Hyun Kim; Jechan Lee; Jong-Oh Kim. Metal oxide and carbon nanomaterial based membranes for reverse osmosis and membrane distillation: A comparative review. Environmental Research 2021, 202, 111716 .

AMA Style

Aftab Ahmad Khan, Hubdar Ali Maitlo, Imtiaz Afzal Khan, Daehwan Lim, Ming Zhang, Ki-Hyun Kim, Jechan Lee, Jong-Oh Kim. Metal oxide and carbon nanomaterial based membranes for reverse osmosis and membrane distillation: A comparative review. Environmental Research. 2021; 202 ():111716.

Chicago/Turabian Style

Aftab Ahmad Khan; Hubdar Ali Maitlo; Imtiaz Afzal Khan; Daehwan Lim; Ming Zhang; Ki-Hyun Kim; Jechan Lee; Jong-Oh Kim. 2021. "Metal oxide and carbon nanomaterial based membranes for reverse osmosis and membrane distillation: A comparative review." Environmental Research 202, no. : 111716.

Review
Published: 16 July 2021 in Journal of Cleaner Production
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Use of agri-biomass is a promising sustainable approach for the production of functional materials while utilizing agro-biomass at the same time. In this respect, lignin derivable from agri-biomass is an economic source to generate functional biomaterials with the biocompatibility and sustainability. As such, lignin has been favorably utilized as a raw material for the preparation of various substances including metal oxide nanocomposites (MONCs). As is the case of MONCs, the applicabilities of lignin-derived MONCs should be extendible to versatile fields [e.g., Ultraviolet (UV) protection, photocatalysis, and antimicrobial agents]. Fabrication of lignocellulosic biomass as a raw material should be a plausible option for the development of UV protective material from the industrial perspective. This review aims to highlight the notable research findings (e.g., in viewpoint of lignin as an economically and environmentally better alternative to the raw chemical material for MONCs synthesis) made over the past few years. In this respect, our emphasis was placed on the development of lignin-based ZnO and TiO2 composites for UV protective applications. The use of lignin for the synthesis of MONCs is thus found as a significant technological advancement over the existing chemical-based methods. This review will also aid in expanding the future applications of lignin-based MONCs, especially with an emphasis on UV-protecting agents in diverse product forms (e.g., coatings, films, and sunscreen).

ACS Style

Ravneet Kaur; Sanjeev K. Bhardwaj; Sanjam Chandna; Ki-Hyun Kim; Jayeeta Bhaumik. Lignin-based metal oxide nanocomposites for UV protection applications: A review. Journal of Cleaner Production 2021, 317, 128300 .

AMA Style

Ravneet Kaur, Sanjeev K. Bhardwaj, Sanjam Chandna, Ki-Hyun Kim, Jayeeta Bhaumik. Lignin-based metal oxide nanocomposites for UV protection applications: A review. Journal of Cleaner Production. 2021; 317 ():128300.

Chicago/Turabian Style

Ravneet Kaur; Sanjeev K. Bhardwaj; Sanjam Chandna; Ki-Hyun Kim; Jayeeta Bhaumik. 2021. "Lignin-based metal oxide nanocomposites for UV protection applications: A review." Journal of Cleaner Production 317, no. : 128300.

Journal article
Published: 13 July 2021 in Chemical Engineering Journal
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As one of the most toxic contaminants, arsenic (As) is well-known for diverse types of adversary effects on the life of living beings. Unfortunately, as the conventional methods of its detection generally suffer from several demerits (e.g., long duration, high cost, and complexity), the engineering of advanced materials could be a solution for the development of next generation sensors. In an effort to validate such proposition, we developed a molybdenum based metal–organic framework (Mo-MOF) by modifying a common form of [(Mo2O6)(4,4′–bpy)]n) as a new sensing platform for As. We have successfully developed and characterized a mixed metal (Co/Mo) MOF for the specific, sensitive, and expeditious detection of As(V) metal ions. The color changing capacity (from purple to blue) of Co/Mo-MOF is found to maintain a good linear relationship with changes in the concentration of As(V) from 0.05 ppb to 1000 ppm. This Mo-based MOF sensor, when bound with spectroscoptic and paper-based methods, offered exceptionally low limits of detection (LOD) for As(V) ions such as 0.02 and 0.04 ppb, respectively.

ACS Style

Kalyan Vaid; Jasmeen Dhiman; Suresh Kumar; Ki-Hyun Kim; Vanish Kumar. Mixed metal (cobalt/molybdenum) based metal-organic frameworks for highly sensitive and specific sensing of arsenic (V): Spectroscopic versus paper-based approaches. Chemical Engineering Journal 2021, 426, 131243 .

AMA Style

Kalyan Vaid, Jasmeen Dhiman, Suresh Kumar, Ki-Hyun Kim, Vanish Kumar. Mixed metal (cobalt/molybdenum) based metal-organic frameworks for highly sensitive and specific sensing of arsenic (V): Spectroscopic versus paper-based approaches. Chemical Engineering Journal. 2021; 426 ():131243.

Chicago/Turabian Style

Kalyan Vaid; Jasmeen Dhiman; Suresh Kumar; Ki-Hyun Kim; Vanish Kumar. 2021. "Mixed metal (cobalt/molybdenum) based metal-organic frameworks for highly sensitive and specific sensing of arsenic (V): Spectroscopic versus paper-based approaches." Chemical Engineering Journal 426, no. : 131243.

Journal article
Published: 13 July 2021 in Bioresource Technology
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Biochar modification is widely used to improve its capability for environmental application, while its impact on carbon sequestration potential is unknown. Herein, the oxidation-resistance stability of biochar with different activation processes was first evaluated, which is crucial for sustainable production of engineered biochar. Thermal activation enhanced the thermal stability of biochar with a higher R50 as 61.5–62.7%, whereas a higher carbon loss of 15.2–17.2% was revealed after chemical oxidation. Physical activation of biochar had marginal effect on thermal stability, but it still weakened its chemical stability. By contrast, chemical activation with H2SO4 improved the stability in terms of chemical-oxidation (6.7% carbon loss) and thermal-oxidation (R50 as 66.2%). Further analysis revealed that the thermal stability of engineered biochar was controlled by aromaticity, while the surface area was a vital factor correlating to the chemical stability. Our findings serve as an important reference to understand trade-off between biochar stability and broader application.

ACS Style

Zibo Xu; Mingjing He; Xiaoyun Xu; Xinde Cao; Daniel C.W. Tsang. Impacts of different activation processes on the carbon stability of biochar for oxidation resistance. Bioresource Technology 2021, 338, 125555 .

AMA Style

Zibo Xu, Mingjing He, Xiaoyun Xu, Xinde Cao, Daniel C.W. Tsang. Impacts of different activation processes on the carbon stability of biochar for oxidation resistance. Bioresource Technology. 2021; 338 ():125555.

Chicago/Turabian Style

Zibo Xu; Mingjing He; Xiaoyun Xu; Xinde Cao; Daniel C.W. Tsang. 2021. "Impacts of different activation processes on the carbon stability of biochar for oxidation resistance." Bioresource Technology 338, no. : 125555.

Review article
Published: 10 July 2021 in Environmental Pollution
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Hollow porous molecularly imprinted polymers (HPMIPs) are regarded as promising adsorbents due to many advantageous properties such as large number of imprinted cavities, highly accessible binding sites, controllable pore structure, and fast mass transfer. This permits analyte molecules to readily access the recognition sites located inside the shell. HPMIPs have improved binding capacity and kinetics with the aid of a greater number of recognition sites on the imprinted shell. This review highlights the synthesis and utility of HPMIPs as adsorbents for extracting targets of interest (e.g., endocrine disrupting chemicals, pharmaceuticals, pesticides, and heavy metal ions). The potential of HPMIPs for the efficient extraction of trace-level targets from complex matrices is also discussed.

ACS Style

Shikha Bhogal; Kuldeep Kaur; Irshad Mohiuddin; Sandeep Kumar; Jechan Lee; Richard J.C. Brown; Ki-Hyun Kim; Ashok Kumar Malik. Hollow porous molecularly imprinted polymers as emerging adsorbents. Environmental Pollution 2021, 288, 117775 .

AMA Style

Shikha Bhogal, Kuldeep Kaur, Irshad Mohiuddin, Sandeep Kumar, Jechan Lee, Richard J.C. Brown, Ki-Hyun Kim, Ashok Kumar Malik. Hollow porous molecularly imprinted polymers as emerging adsorbents. Environmental Pollution. 2021; 288 ():117775.

Chicago/Turabian Style

Shikha Bhogal; Kuldeep Kaur; Irshad Mohiuddin; Sandeep Kumar; Jechan Lee; Richard J.C. Brown; Ki-Hyun Kim; Ashok Kumar Malik. 2021. "Hollow porous molecularly imprinted polymers as emerging adsorbents." Environmental Pollution 288, no. : 117775.

Journal article
Published: 08 July 2021 in Chemical Engineering Journal
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Catalytic oxidation of pollutant(s) into innocuous end products (carbon dioxide (CO2) and water) without heat or light sources is an ideal option for air quality management. In pursuit of such goal, platinum (Pt) supported by waste eggshell (biogenic calcium carbonate), namely Pt/eggshell, is synthesized through a simple wetness impregnation approach to catalyze 100 ppm formaldehyde (FA) into CO2 at room temperature (RT: 30 °C). The co-impregnation of potassium (K) alongside Pt leads to a full-sclae (100%) enhancement in the net catalytic activity to destruct FA. The in-situ diffuse reflectance infrared Fourier transform spectroscopy analysis suggests the FA oxidation pathway to involve dioxymethylene, formate, and carbon monoxide intermediates. The FA reaction pathways and associated mechanisms are also accounted for based on the density functional theory simulations. This study opens a new path for developing high-performance biowaste-derived catalysts for the complete mineralization of gaseous FA without the supply of external energy sources.

ACS Style

Kumar Vikrant; Ki-Hyun Kim; Fan Dong; Danil W. Boukhvalov; Wonyong Choi. Deep oxidation of gaseous formaldehyde at room-temperature by a durable catalyst formed through the controlled addition of potassium to platinum supported on waste eggshell. Chemical Engineering Journal 2021, 428, 131177 .

AMA Style

Kumar Vikrant, Ki-Hyun Kim, Fan Dong, Danil W. Boukhvalov, Wonyong Choi. Deep oxidation of gaseous formaldehyde at room-temperature by a durable catalyst formed through the controlled addition of potassium to platinum supported on waste eggshell. Chemical Engineering Journal. 2021; 428 ():131177.

Chicago/Turabian Style

Kumar Vikrant; Ki-Hyun Kim; Fan Dong; Danil W. Boukhvalov; Wonyong Choi. 2021. "Deep oxidation of gaseous formaldehyde at room-temperature by a durable catalyst formed through the controlled addition of potassium to platinum supported on waste eggshell." Chemical Engineering Journal 428, no. : 131177.

Journal article
Published: 07 July 2021 in Environmental Research
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Phosphorus (P) availability is closely related to the distributions of pH, O2 and phosphatase activities in the rhizosphere of plants growing in soils and sediments. In this study, the P uptake processes and mechanisms of Vallisneria natans (V. natans) during two vegetation periods (i.e., week three and six) were revealed using three noninvasive 2D imaging techniques: planar optode (PO), diffusive gradients in thin films (DGT) and zymography. The results showed that increased phosphatase activity, O2 concentration and root-induced acidification were observed together in the rhizosphere of root segments and tips. In week three, when V. natans was young, the flux of DGT-labile P accumulated more in the rhizosphere in comparison with the bulk sediment. This was because increased phosphatase activity (of up to 35%) and root-induced acidification (with pH decreasing by up to 0.25) enhanced P acquisition of V. natans by the third week. However, the flux of DGT-labile P turned to depletion during weeks three to six of V. natans growth, after Fe plaque formed at the matured stage. The constant hydrolysis of phosphatase and acidification could not compensate for the P demand of the roots by the sixth week. At this stage, Fe plaque become the P pool, due to P fixation with solid Fe(III) hydroxides. Subsequently, V. natans roots acquired P from Fe plaque via organic acid complexation of Fe(III).

ACS Style

Yi Zhang; Cai Li; Qin Sun; Cuiling Jiang; Shiming Ding; Musong Chen; Xin Ma; Zhilin Zhong; Yan Wang; Daniel C.W. Tsang. Phosphorus acquisition strategy of Vallisneria natans in sediment based on in situ imaging techniques. Environmental Research 2021, 202, 111635 .

AMA Style

Yi Zhang, Cai Li, Qin Sun, Cuiling Jiang, Shiming Ding, Musong Chen, Xin Ma, Zhilin Zhong, Yan Wang, Daniel C.W. Tsang. Phosphorus acquisition strategy of Vallisneria natans in sediment based on in situ imaging techniques. Environmental Research. 2021; 202 ():111635.

Chicago/Turabian Style

Yi Zhang; Cai Li; Qin Sun; Cuiling Jiang; Shiming Ding; Musong Chen; Xin Ma; Zhilin Zhong; Yan Wang; Daniel C.W. Tsang. 2021. "Phosphorus acquisition strategy of Vallisneria natans in sediment based on in situ imaging techniques." Environmental Research 202, no. : 111635.

Review article
Published: 04 July 2021 in Applied Materials Today
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Modern civilization has been accompanied by increased emissions of many harmful organic pollutants into ecosystems. Photocatalysis is a green, viable, and inexpensive technique to destruct harmful organic compounds into CO2 and water. In this regard, bimetallic nanostructure doped semiconductor (BDS) composites have gained a great deal of attention as photocatalysts with the aid of progress achieved in the design, synthesis, and modification of porous metal-organic frameworks (MOFs). In this review, the basic principle of BDS-based photocatalysis is discussed with a main emphasis on bimetallic nanostructure doped MOFs (BDM). The photocatalytic performances of various target species are thus evaluated for BDM in reference to other types of BDS or to its monometallic counterparts. Further, different synthesis approaches employed for their construction are also discussed. Moreover, the new challenges and future research prospects are highlighted to help gain advancement in the BDM-based photocatalytic systems.

ACS Style

Aadil Bathla; Sherif A. Younis; Bonamali Pal; Ki-Hyun Kim. Recent progress in bimetallic nanostructure impregnated metal-organic framework for photodegradation of organic pollutants. Applied Materials Today 2021, 24, 101105 .

AMA Style

Aadil Bathla, Sherif A. Younis, Bonamali Pal, Ki-Hyun Kim. Recent progress in bimetallic nanostructure impregnated metal-organic framework for photodegradation of organic pollutants. Applied Materials Today. 2021; 24 ():101105.

Chicago/Turabian Style

Aadil Bathla; Sherif A. Younis; Bonamali Pal; Ki-Hyun Kim. 2021. "Recent progress in bimetallic nanostructure impregnated metal-organic framework for photodegradation of organic pollutants." Applied Materials Today 24, no. : 101105.

Journal article
Published: 02 July 2021 in Chemical Engineering Journal
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Highly active platinum (Pt)-based nanostructured materials are expected as catalysts to effectively mineralize recalcitrant aromatic volatile organic compounds (e.g., benzene) even at low temperature conditions. In this regard, the utility of a titanium dioxide (TiO2) supported Pt (1 wt%) catalyst was explored for the thermocatalytic oxidation of benzene in the air. The superior performance of Pt/TiO2-R (‘R’ denotes the high-temperature hydrogen-based reduction pre-treatment of the catalyst) over its non-reduced counterpart was attributed to the increase in metallic Pt (Pt0) nanoparticles present on the TiO2 surface alongside strong metal-support interactions (SMSIs). The SMSIs at the Pt-TiO2 interface partially reduced the metal oxide structure to generate Ti3+ centers, giving rise to oxygen vacancies. The analysis of in-situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) revealed that the benzene molecules are oxidized into carbon dioxide via phenolate, benzoquinone, carboxylate, and carbon monoxide intermediates. The present study offers new insights into the application of Pt-based high-performance catalysts for achieving complete removal of benzene at low temperatures.

ACS Style

Jeong-Min Kim; Kumar Vikrant; Taejin Kim; Ki-Hyun Kim; Fan Dong. Thermocatalytic oxidation of gaseous benzene by a titanium dioxide supported platinum catalyst. Chemical Engineering Journal 2021, 428, 131090 .

AMA Style

Jeong-Min Kim, Kumar Vikrant, Taejin Kim, Ki-Hyun Kim, Fan Dong. Thermocatalytic oxidation of gaseous benzene by a titanium dioxide supported platinum catalyst. Chemical Engineering Journal. 2021; 428 ():131090.

Chicago/Turabian Style

Jeong-Min Kim; Kumar Vikrant; Taejin Kim; Ki-Hyun Kim; Fan Dong. 2021. "Thermocatalytic oxidation of gaseous benzene by a titanium dioxide supported platinum catalyst." Chemical Engineering Journal 428, no. : 131090.

Review article
Published: 29 June 2021 in Coordination Chemistry Reviews
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Zeolitic imidazolate frameworks (ZIFs) can be classified as metal–organic frameworks (MOFs) or metal-azolate frameworks (MAFs) with unique topologies. The presence of five membered heterocyclic ring structure in imidazole ring-based linkers facilitates their robust coordination with bridging metal nodes. This stable coordination imparts numerous advantageous properties (e.g., facile and reproducible crystallization, nanoscale processability, high loading capacities, and good biocompatibility) to ZIFs. Further, the technical advancements in the synthesis of porous coordination polymers have contributed to the diversification in the fabrication approaches needed for the ZIFs and to the characterization of their structural and functional attributes (e.g., ZIF-8 and ZIF-67). In light of this advancement in ZIF technologies, we describe the synthesis methods for the fabrication of ZIFs in relation to their resulting properties. This review also highlights the application of ZIF-based probes for sensing of a diverse array of targets (e.g., gas molecules, metabolites, pesticides, and metals). Further, a performance comparison between various ZIF-based sensing systems has been made for the listed target analytes in terms of various quality assurance (QA) criteria (e.g., sensor response and recovery time, limit of detection (LOD), specificity, and reproducibility). At last, the current challenges and future outlook for this research field are also discussed to help expand their real-world applications.

ACS Style

Preeti Kukkar; Ki-Hyun Kim; Deepak Kukkar; Pritpal Singh. Recent advances in the synthesis techniques for zeolitic imidazolate frameworks and their sensing applications. Coordination Chemistry Reviews 2021, 446, 214109 .

AMA Style

Preeti Kukkar, Ki-Hyun Kim, Deepak Kukkar, Pritpal Singh. Recent advances in the synthesis techniques for zeolitic imidazolate frameworks and their sensing applications. Coordination Chemistry Reviews. 2021; 446 ():214109.

Chicago/Turabian Style

Preeti Kukkar; Ki-Hyun Kim; Deepak Kukkar; Pritpal Singh. 2021. "Recent advances in the synthesis techniques for zeolitic imidazolate frameworks and their sensing applications." Coordination Chemistry Reviews 446, no. : 214109.

Journal article
Published: 26 June 2021 in Energy
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The pyrolysis of metal-organic frameworks (MOFs) is an effective strategy for the synthesis of novel nanoporous structures for energy storage applications. In this work, the preparation of a zirconium oxide/carbon (ZrO2/C) nanocomposite via the pyrolysis of UiO-66 (a zirconium-based MOF) is reported for the first time. These MOF-derived metal oxide/carbon (ZrO2/C) materials have a great advantage in the case of supercapacitor applications over other MOFs or their derivatives as they do not need any external conductive agent. The ZrO2/C electrode exhibits an excellent electrochemical performance, delivering a specific capacitance of 241.5 F/g at 1 A/g current density. A 2 V symmetrical supercapacitor device is also prepared by employing a solid-state polymer gel electrolyte. The assembled device of ZrO2/C electrode has delivered a high energy density of around 29 Wh/kg (at a high power density of 1.5 kW/kg) while retaining almost 97% of the specific capacitance even after 2000 continuous charge/discharge cycles.

ACS Style

Vishal Shrivastav; Shashank Sundriyal; Umesh K. Tiwari; Ki-Hyun Kim; Akash Deep. Metal-organic framework derived zirconium oxide/carbon composite as an improved supercapacitor electrode. Energy 2021, 235, 121351 .

AMA Style

Vishal Shrivastav, Shashank Sundriyal, Umesh K. Tiwari, Ki-Hyun Kim, Akash Deep. Metal-organic framework derived zirconium oxide/carbon composite as an improved supercapacitor electrode. Energy. 2021; 235 ():121351.

Chicago/Turabian Style

Vishal Shrivastav; Shashank Sundriyal; Umesh K. Tiwari; Ki-Hyun Kim; Akash Deep. 2021. "Metal-organic framework derived zirconium oxide/carbon composite as an improved supercapacitor electrode." Energy 235, no. : 121351.

Journal article
Published: 24 June 2021 in Chemical Engineering Journal
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To learn more about the competing roles of the key process variables (e.g., particle size vs. space velocity) in the adsorption of volatile organic compounds (VOCs), the breakthrough (BT) behavior of gaseous benzene (at 3 Pa) was investigated using microporous activated carbon (AC) beds built individually with each of four different particle size ranges (<0.6, 0.6–1.7, 1.7–2.36, and 2.36–5 mm) at three flow rates (300, 500, and 1000 mL min−1). The effects of each variable on AC performance were evaluated in relation to the occurrence patterns of BT. The key performance metrics (e.g., capacity and partition coefficient) generally increased with decreases in particle size and flow rate, reflecting the critical role of sorbent bed physical properties (e.g., surface area, space velocity, and residence time) in the adsorption process. The smallest particle group (<0.6 mm) exhibited the highest uptake rate in the initial BT stage in terms of breakthrough volume (BTV: L g−1) (e.g., BTV5% (5% BTV) = 424 L g−1). In contrast, the order for 100% BT was reversed to record the highest at the largest particle group (2.36 – 5 mm). The kinetic modeling suggests the dominant role of the pore-diffusion mechanism on the overall adsorption process with enhanced benzene uptake rate onto smaller carbon particle sizes at higher flow rates. Based on this work, we recommend accurate determination of the relative dominance between adsorbent particle size and space velocity to maximize the efficiency of air filtration systems for real-world applications.

ACS Style

Seung-Ho Ha; Sherif A. Younis; Kumar Vikrant; Jan E. Szulejko; Ki-Hyun Kim. Evidence of the dominant role of particle size in controlling the dynamic adsorption breakthrough behavior of gaseous benzene in a microporous carbon bed system. Chemical Engineering Journal 2021, 427, 130977 .

AMA Style

Seung-Ho Ha, Sherif A. Younis, Kumar Vikrant, Jan E. Szulejko, Ki-Hyun Kim. Evidence of the dominant role of particle size in controlling the dynamic adsorption breakthrough behavior of gaseous benzene in a microporous carbon bed system. Chemical Engineering Journal. 2021; 427 ():130977.

Chicago/Turabian Style

Seung-Ho Ha; Sherif A. Younis; Kumar Vikrant; Jan E. Szulejko; Ki-Hyun Kim. 2021. "Evidence of the dominant role of particle size in controlling the dynamic adsorption breakthrough behavior of gaseous benzene in a microporous carbon bed system." Chemical Engineering Journal 427, no. : 130977.

Review article
Published: 17 June 2021 in Science of The Total Environment
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The abatement of airborne pathogens such as bacteria, viruses, and fungi has become an important goal of air-quality management. Efficient and effective treatment techniques such as photocatalysis are essential for disinfection of airborne microorganisms. This review focuses on recent advances in the formulation and development of photocatalytic disinfection, design of efficient photocatalysts, choice of photocatalytic reactor, removal and/or disinfection mechanisms, and the role of reactive ion species. Data from recent studies are analyzed to accurately assess the efficacy of such disinfection approaches. This review also highlights the application of innovative materials in individual and combined abatement systems against airborne bacterial, viral, and fungal pathogens. We discuss the efficiency and benefits presented by such systems, address the challenges, and provide a perspective for future research.

ACS Style

Younes Ahmadi; Neha Bhardwaj; Ki-Hyun Kim; Sandeep Kumar. Recent advances in photocatalytic removal of airborne pathogens in air. Science of The Total Environment 2021, 794, 148477 .

AMA Style

Younes Ahmadi, Neha Bhardwaj, Ki-Hyun Kim, Sandeep Kumar. Recent advances in photocatalytic removal of airborne pathogens in air. Science of The Total Environment. 2021; 794 ():148477.

Chicago/Turabian Style

Younes Ahmadi; Neha Bhardwaj; Ki-Hyun Kim; Sandeep Kumar. 2021. "Recent advances in photocatalytic removal of airborne pathogens in air." Science of The Total Environment 794, no. : 148477.

Journal article
Published: 16 June 2021 in Journal of Cleaner Production
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Producing commodity aromatic hydrocarbons from textile waste is a promising approach to promote carbon neutrality and circular economy. Catalytic degradation of flax waste (FW) to generate furans and its subsequent Diels-Alder transformation to monocyclic aromatic hydrocarbons over USY zeolite were conducted. Experimental results indicated that USY catalyzed FW resulted in a 5.5-fold increase in furans production compared with the non-catalytic trial. The Si/Al molar ratio in USY played a determining role in furans formation, and a 5-fold increase was observed over USY with a Si/Al ratio of 5.3 as opposed to that with a Si/Al ratio of 11. Plastic waste, polyethylene (PE), co-fed with FW yielded 1.6 times higher aromatic hydrocarbons than polypropylene (PP). The selectivity to aromatic hydrocarbons reached 81.6% under 20% PE co-fed with 80% FW, in which benzene, toluene, and xylenes (BTX) were predominant products with the maximum selectivity of 68%. This study presents a cleaner approach for value-added resource recovery and sustainable management of textile and plastic waste.

ACS Style

Jia Wang; Jianchun Jiang; Jinhua Ding; Xiaobo Wang; Yunjuan Sun; Roger Ruan; Arthur J. Ragauskas; Yong Sik Ok; Daniel C.W. Tsang. Promoting Diels-Alder reactions to produce bio-BTX: Co-aromatization of textile waste and plastic waste over USY zeolite. Journal of Cleaner Production 2021, 314, 127966 .

AMA Style

Jia Wang, Jianchun Jiang, Jinhua Ding, Xiaobo Wang, Yunjuan Sun, Roger Ruan, Arthur J. Ragauskas, Yong Sik Ok, Daniel C.W. Tsang. Promoting Diels-Alder reactions to produce bio-BTX: Co-aromatization of textile waste and plastic waste over USY zeolite. Journal of Cleaner Production. 2021; 314 ():127966.

Chicago/Turabian Style

Jia Wang; Jianchun Jiang; Jinhua Ding; Xiaobo Wang; Yunjuan Sun; Roger Ruan; Arthur J. Ragauskas; Yong Sik Ok; Daniel C.W. Tsang. 2021. "Promoting Diels-Alder reactions to produce bio-BTX: Co-aromatization of textile waste and plastic waste over USY zeolite." Journal of Cleaner Production 314, no. : 127966.

Review article
Published: 16 June 2021 in Science of The Total Environment
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The ongoing COVID-19 pandemic made us re-realize the importance of environmental disinfection and sanitation in indoor areas, hospitals, and clinical rooms. UVC irradiation of high energy and short wavelengths, especially in the 200–290-nm range possesses the great potential for germicidal disinfection. These properties of UVC allow to damage or destruct the nucleic acids (DNA/RNA) in diverse microbes (e.g., bacteria, fungi, and viruses). UVC light can hence be used as a promising tool for prevention and control of their infection or transmission. The present review offers insights into the historical perspective, mode of action, and recent advancements in the application of UVC-based antiviral therapy against coronaviruses (including SARS CoV-2). Moreover, the application of UVC lights in the sanitization of healthcare units, public places, medical instruments, respirators, and personal protective equipment (PPE) is also discussed. This article, therefore, is expected to deliver a new path for the developments of UVC-based viricidal approach.

ACS Style

Sanjeev K. Bhardwaj; Harpreet Singh; Akash Deep; Madhu Khatri; Jayeeta Bhaumik; Ki-Hyun Kim; Neha Bhardwaj. UVC-based photoinactivation as an efficient tool to control the transmission of coronaviruses. Science of The Total Environment 2021, 792, 148548 -148548.

AMA Style

Sanjeev K. Bhardwaj, Harpreet Singh, Akash Deep, Madhu Khatri, Jayeeta Bhaumik, Ki-Hyun Kim, Neha Bhardwaj. UVC-based photoinactivation as an efficient tool to control the transmission of coronaviruses. Science of The Total Environment. 2021; 792 ():148548-148548.

Chicago/Turabian Style

Sanjeev K. Bhardwaj; Harpreet Singh; Akash Deep; Madhu Khatri; Jayeeta Bhaumik; Ki-Hyun Kim; Neha Bhardwaj. 2021. "UVC-based photoinactivation as an efficient tool to control the transmission of coronaviruses." Science of The Total Environment 792, no. : 148548-148548.

Journal article
Published: 16 June 2021 in ACS Sustainable Chemistry & Engineering
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Biochar is a known product to permanently remove carbon from its cycle. It is essential to find high-quality and large-quantity utilization for biochar. This study assessed the efficacy of biochar on the hydration of magnesia cement (MC) and magnesia cement–Portland binary cement (MP)-based pastes and evaluated the synergistic effect of biochar and CO2 curing on the pastes. The thermogravimetric and X-ray diffraction analyses showed that the incorporation of biochar, especially CO2 gasification biochar, promoted the generation of hydration products due to the internal curing effect. The use of CO2 curing effectively accelerated the carbonation of pastes. Hydrated magnesium carbonates were preferentially formed in CO2-cured MC pastes, whereas CaCO3 was preferentially generated in CO2-cured MP pastes. Moreover, the incorporation of biochar, especially porous CO2 gasification biochar, could further facilitate CO2 diffusion and promote carbonation. As a result, the synchronous use of biochar and CO2 curing significantly enhanced the mechanical strength of blocks. Therefore, biochar-augmented and CO2-enhanced composites could be novel and low-carbon construction materials for sustainable engineering applications.

ACS Style

Lei Wang; Liang Chen; C. S. Poon; Chi-Hwa Wang; Yong Sik Ok; Viktor Mechtcherine; Daniel C. W. Tsang. Roles of Biochar and CO2 Curing in Sustainable Magnesia Cement-Based Composites. ACS Sustainable Chemistry & Engineering 2021, 1 .

AMA Style

Lei Wang, Liang Chen, C. S. Poon, Chi-Hwa Wang, Yong Sik Ok, Viktor Mechtcherine, Daniel C. W. Tsang. Roles of Biochar and CO2 Curing in Sustainable Magnesia Cement-Based Composites. ACS Sustainable Chemistry & Engineering. 2021; ():1.

Chicago/Turabian Style

Lei Wang; Liang Chen; C. S. Poon; Chi-Hwa Wang; Yong Sik Ok; Viktor Mechtcherine; Daniel C. W. Tsang. 2021. "Roles of Biochar and CO2 Curing in Sustainable Magnesia Cement-Based Composites." ACS Sustainable Chemistry & Engineering , no. : 1.

Journal article
Published: 16 June 2021 in Journal of Cleaner Production
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NO2 is a potent air pollutant because of its deleterious effects on human beings and other organisms. The state-of-the-art catalysis-based deNOx techniques (e.g., selective catalytic/non-catalytic reduction) are incapable of ambient NO2 abatement due to their low efficiency at temperatures below 300 °C. It is thus conceivable to directly capture NO2 from the atmosphere by selective adsorption on porous materials. This work reports the rational development and demonstration of the Mg–Al layered double hydroxides (LDHs) and their derived mixed metal oxides (MMO), using environmentally benign solvents, as high-capacity adsorbents for ambient NO2 abatement. By boosting the densities of accessible basic sites using layer delamination strategies, the highest NO2 adsorption capacity of 8.52 mmol/g was achieved by the delaminated LDH material (LDH-AM), which was substantially higher than other popular and robust adsorbents, such as zeolites (0.36–3 mmol/g) and carbon-based adsorbents (2–6 mmol/g). Using Fourier transform infrared spectroscopy and powder X-ray diffraction, it was revealed that NO2 adsorption occurs on the surface M-OH basic sites and within the layers by simultaneously replacing the interlayer CO32− ions of LDH. This work affords not only promising, durable, and scalable adsorbents for ambient NO2 removal but also a strategy to develop adsorbents with high density of basic sites for capture of other pollutant acid gases from the environment.

ACS Style

Aamir Hanif; Mingzhe Sun; Tianqi Wang; Shanshan Shang; Daniel C.W. Tsang; Jin Shang. Ambient NO2 adsorption removal by Mg–Al layered double hydroxides and derived mixed metal oxides. Journal of Cleaner Production 2021, 313, 127956 .

AMA Style

Aamir Hanif, Mingzhe Sun, Tianqi Wang, Shanshan Shang, Daniel C.W. Tsang, Jin Shang. Ambient NO2 adsorption removal by Mg–Al layered double hydroxides and derived mixed metal oxides. Journal of Cleaner Production. 2021; 313 ():127956.

Chicago/Turabian Style

Aamir Hanif; Mingzhe Sun; Tianqi Wang; Shanshan Shang; Daniel C.W. Tsang; Jin Shang. 2021. "Ambient NO2 adsorption removal by Mg–Al layered double hydroxides and derived mixed metal oxides." Journal of Cleaner Production 313, no. : 127956.