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Ha MJ, Lee JE, Park Y, Cha JS, Kim YM, Kim BS. Catalytic ozonation of methylethylketone over porous Mn-Cu/HZSM-5. Environ Res 2023; 227:115706. [PMID: 36931381 DOI: 10.1016/j.envres.2023.115706] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2022] [Revised: 03/08/2023] [Accepted: 03/15/2023] [Indexed: 05/08/2023]
Abstract
The catalytic ozonation of methylethylketone (MEK) was performed at the room temperature (25 °C) using the synthesized Mn and Cu-loaded zeolite (ZSM-5, SiO2/Al2O3 = 80) catalysts. The ZSM-5 zeolite was used as a porous support material due to the large surface area and high capacity for adsorption of volatile organic compounds. Since Mn and Cu-loaded zeolite catalysts were effective for the catalytic ozonation of VOCs such as MEK, according to the loaded concentration of Mn and Cu, there are four types of metal loaded ZSM5 catalysts synthesized [5 wt% Mn/ZSM-5, 5 wt% Cu/ZSM-5, 5 wt% Mn-1 wt% Cu/ZSM-5 (5Mn1CuZSM), and 5 wt% Cu-1 wt% Mn/ZSM-5]. The catalytic efficiency for the removal of MEK and ozonation using the different catalysts was also studied. Based on various experimental analysis processes, the characteristics of the synthesized catalysts were explored and the removal efficiencies of MEK and O3 together with the COx concentration generated from the destruction of MEK and O3 were explored. The results for the decomposition of MEK and O3 at the room temperature indicated that the Mn dominant ZSM-5 catalysts showed better efficiency for the conversion of MEK and O3. The 5 wt% Mn/ZSM-5 outweighed the rest of them for the removal of MEK while the 5Mn1CuZSM showed the best catalytic reactivity for the conversion of O3 and the CO2 selectivity. It was ascertained that during the reaction time of catalyst and reactants of 120 min the Mn dominantly deposited bimetallic catalyst, 5Mn1CuZSM, was determined as the most effective for the removal of MEK and O3 due to the high capability of production of Mn3+ species and more available adsorbed oxygen sites compared to the other catalysts. Finally, the durability measurement for the 5Mn1CuZSM catalyst was performed together with the produced CO and CO2 concentration for 420 min.
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Affiliation(s)
- Min-Ji Ha
- Korea Environment Corporation, Incheon, 22689, Republic of Korea
| | - Jung Eun Lee
- Department of Environmental Engineering, Kwangwoon University, Seoul, 01897, Republic of Korea
| | - Y Park
- University of Seoul, Seoul, 02504, Republic of Korea
| | - Jin Sun Cha
- Material Technology Center, Korea Testing Laboratory, Seoul, 08389, Republic of Korea
| | - Young-Min Kim
- Department of Environmental Engineering, Daegu University, Gyeongsan, 38453, Republic of Korea.
| | - Beom-Sik Kim
- Hydrogen Research Center, Research Institute of Industrial Science and Technology, Pohang, 37673, Republic of Korea.
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Cha JS, Kim YM, Lee IH, Choi YJ, Rhee GH, Song H, Jeon BH, Lam SS, Khan MA, Andrew Lin KY, Chen WH, Park YK. Mitigation of hazardous toluene via ozone-catalyzed oxidation using MnOx/Sawdust biochar catalyst. Environ Pollut 2022; 312:119920. [PMID: 35977635 DOI: 10.1016/j.envpol.2022.119920] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Revised: 07/16/2022] [Accepted: 08/04/2022] [Indexed: 06/15/2023]
Abstract
This study investigated catalytic ozone oxidation using a sawdust char (SDW) catalyst to remove hazardous toluene emitted from the chemical industry. The catalyst properties were analyzed by proximate, ultimate, nitrogen adsorption-desorption isotherms, Fourier-transform infrared, and X-ray photoelectron spectroscopy analyses. In addition, hydrogen-temperature programmed reduction experiments were conducted to analyze the catalyst properties. The specific area and formation of micropores of SDC were improved by applying KOH treatment. MnOx/SDC-K3 exhibited a higher toluene removal efficiency of 89.7% after 100 min than MnOx supported on activated carbon (MnOx/AC) with a removal efficiency of 6.6%. The higher (Oads (adsorbed oxygen)+Ov(vacancy oxygen))/OL (lattice oxygen) and Mn3+/Mn4+ ratios of MnOx/SDC-K3 than those of MnOx/AC seemed to be important for the catalytic oxidation of toluene.
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Affiliation(s)
- Jin Sun Cha
- Material Technology Center, Korea Testing Laboratory, Seoul, 08389, Republic of Korea
| | - Young-Min Kim
- Department of Environmental Engineering, Daegu University, Gyeongsan, 38453, Republic of Korea
| | - Im Hack Lee
- School of Environmental Engineering, University of Seoul, Seoul, 02504, Republic of Korea
| | - Yong Jun Choi
- School of Environmental Engineering, University of Seoul, Seoul, 02504, Republic of Korea
| | - Gwang Hoon Rhee
- Department of Mechanical and Information Engineering, University of Seoul, 02504, Seoul, Republic of Korea
| | - Hocheol Song
- Department of Earth Resources and Environmental Engineering, Hanyang University, Seoul, 04763, Republic of Korea
| | - Byong-Hun Jeon
- Department of Earth Resources and Environmental Engineering, Hanyang University, Seoul, 04763, Republic of Korea
| | - Su Shiung Lam
- Higher Institution Centre of Excellence (HICoE), Institute of Tropical Aquaculture and Fisheries (AKUATROP), Universiti Malaysia Terengganu, 21030, Kuala Nerus, Terengganu, Malaysia
| | - Moonis Ali Khan
- Chemistry Department, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia
| | - Kun-Yi Andrew Lin
- Department of Environmental Engineering, National Chung Hsing University, 250 Kuo-Kuang Road, Taichung, Taiwan
| | - Wei-Hsin Chen
- Department of Aeronautics and Astronautics, National Cheng Kung Univ., Tainan, 701, Taiwan; Research Center for Smart Sustain. Circular Economy, Tunghai Univ., Taichung, 407, Taiwan; Department of Mechanical. Engineering, National Chin-Yi Univ. of Technol., Taichung, 411, Taiwan
| | - Young-Kwon Park
- School of Environmental Engineering, University of Seoul, Seoul, 02504, Republic of Korea.
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Cha JS, Jang SH, Lam SS, Kim H, Kim YM, Jeon BH, Park YK. Performance of CO 2 and Fe-modified lignin char on arsenic (V) removal from water. Chemosphere 2021; 279:130521. [PMID: 33866093 DOI: 10.1016/j.chemosphere.2021.130521] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2021] [Revised: 03/26/2021] [Accepted: 04/05/2021] [Indexed: 05/28/2023]
Abstract
Biochar was produced by the pyrolysis of Kraft lignin at 600 °C followed by modification with CO2 at 700 and 800 °C and impregnation with FeOx. The physicochemical properties and arsenic (V) adsorption performance of biochar were evaluated. The characteristics of the lignin biochar before and after CO2 modification and FeOx impregnation were analyzed using the following methods: proximate and ultimate analysis, specific surface area (Brunauer-Emmett-Teller (BET) surface area), porosity, scanning electron microscopy and energy dispersive spectroscopy mapping, Fourier-transform infrared spectroscopy and X-ray photoelectron spectroscopy. The specific surface area and porosity of biochar were improved significantly after CO2 modification. However, impregnation of FeOx in CO2-modified biochar showed a 50%-60% decrease of BET surface area and porosity due to pore blocking of FeOx. The batch adsorption of arsenic (V) showed that FeOx-LC-800 (FeOx impregnation lignin char modified with CO2 at 800 °C) had the highest adsorption efficiency among the biochars tested because of its highest Fe-O intensity and large surface area. The Langmuir adsorption model was suitable for the curve fitting arsenic (V) adsorption. The theoretical equilibrium adsorption amount (qe) was calculated to be 6.8 mg/g using a pseudo-second-order kinetic model.
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Affiliation(s)
- Jin Sun Cha
- Material Technology Center, Korea Testing Laboratory, Seoul, 08389, Republic of Korea
| | - Seong-Ho Jang
- Department of Bio-Environmental Energy, Pusan National University, Miryang, 50463, Republic of Korea
| | - Su Shiung Lam
- Higher Institution Centre of Excellence (HICoE), Institute of Tropical Aquaculture and Fisheries (AKUATROP), Universiti Malaysia Terengganu, 21030, Kuala Nerus, Terengganu, Malaysia
| | - Hyungjoo Kim
- School of Environmental Engineering, University of Seoul, Seoul, 02504, Republic of Korea; Environmental New Business Center, Korea Testing Laboratory, Seoul, 08389, Republic of Korea
| | - Young-Min Kim
- Department of Environmental Engineering, Daegu University, Gyeongsan, 38453, Republic of Korea
| | - Byong-Hun Jeon
- Department of Earth Resources and Environmental Engineering, Hanyang University, Seoul, 04763, Republic of Korea
| | - Young-Kwon Park
- School of Environmental Engineering, University of Seoul, Seoul, 02504, Republic of Korea.
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Abstract
In this study, the physicochemical properties of modified biochar using different methods, such as physical (CO₂, steam) and chemical (KOH and H₃PO₄) methods, were estimated by X-ray diffraction, N₂ adsorption-desorption, field-emission scanning electron microscopy equipped with energy-dispersive X-ray spectroscopy, and Fourier transform infrared spectroscopy. The performance of chars was evaluated using a Cr adsorption performance test. Among various chars modified in this study, CHC-P modified by H₃PO₄ showed the highest chromium adsorption efficiency. The adsorption efficiency was affected by the high nano-porosity, large surface area, and surface oxygen-containing functional groups.
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Affiliation(s)
- Hyungjoo Kim
- Environmental New Business Center, Korea Testing Laboratory, Seoul, 08389, Republic of Korea
| | - Jin Sun Cha
- Material Technology Center, Korea Testing Laboratory, Seoul, 08389, Republic of Korea
| | - Jieun Park
- School of Environmental Engineering, University of Seoul, Seoul, 02504, Republic of Korea
| | - Young-Min Kim
- Department of Environmental Engineering, Daegu University, Gyeongsan, 38453, Korea
| | - Young-Kwon Park
- School of Environmental Engineering, University of Seoul, Seoul, 02504, Republic of Korea
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Ro D, Shafaghat H, Jang SH, Lee HW, Jung SC, Jae J, Cha JS, Park YK. Production of an upgraded lignin-derived bio-oil using the clay catalysts of bentonite and olivine and the spent FCC in a bench-scale fixed bed pyrolyzer. Environ Res 2019; 172:658-664. [PMID: 30878737 DOI: 10.1016/j.envres.2019.03.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Revised: 02/27/2019] [Accepted: 03/06/2019] [Indexed: 06/09/2023]
Abstract
Lignocellulosic biomass is an abundant renewable energy source that can be converted into various liquid fuels via thermochemical processes such as pyrolysis. Pyrolysis is a thermal decomposition method, in which solid biomass are thermally depolymerized to liquid fuel called bio-oil or pyrolysis oil. However, the low quality of pyrolysis oil caused by its high oxygen content necessitates further catalytic upgrading to increase the content of oxygen-free compounds, such as aromatic hydrocarbons. Among the three different types of lignocellulosic biomass components (hemicellulose, lignin, and cellulose), lignin is the most difficult fraction to be pyrolyzed because of its highly recalcitrant structure for depolymerization, forming a char as a main product. The catalytic conversion of lignin-derived pyrolyzates is also more difficult than that of furans and levoglucosan which are the main pyrolysis products of hemicellulose and cellulose. Hence, the main purpose of this study was to develop a bench-scale catalytic pyrolysis process using a tandem catalyst (both in-situ and ex-situ catalysis mode) for an efficient pyrolysis and subsequent upgrading of lignin components. While HZSM-5 was employed as an ex-situ catalyst for its excellent aromatization efficiency, the potential of the low-cost additives of bentonite, olivine, and spent FCC as in-situ catalysts in the Kraft lignin pyrolysis at 500 °C was investigated. The effects of these in-situ catalysts on the product selectivity were studied; bentonite resulted in higher selectivity to aromatic hydrocarbons compared to olivine and spent FCC. The reusability of HZSM-5 (with and without regeneration) was examined in the pyrolysis of lignin mixed with the in-situ catalysts of bentonite, olivine, and spent FCC. In the case of using bentonite and spent FCC as in-situ catalysts, there were no obvious changes in the activity of HZSM-5 after regeneration, whereas using olivine as in-situ catalyst resulted in a remarkable decrease in the activity of HZSM-5 after regeneration.
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Affiliation(s)
- Donghoon Ro
- School of Environmental Engineering, University of Seoul, Seoul 02504, Republic of Korea
| | - Hoda Shafaghat
- School of Environmental Engineering, University of Seoul, Seoul 02504, Republic of Korea
| | - Seong-Ho Jang
- Department of BioEnvironmental Energy, Pusan National University, Miryang 50463, Republic of Korea
| | - Hyung Won Lee
- School of Environmental Engineering, University of Seoul, Seoul 02504, Republic of Korea
| | - Sang-Chul Jung
- Department of Environmental Engineering, Sunchon National University, Suncheon 57922, Republic of Korea
| | - Jungho Jae
- School of Chemical and Biomolecular Engineering, Pusan National University, Busan 46241, Republic of Korea
| | - Jin Sun Cha
- Korea Testing Laboratory, Seoul 08389, Republic of Korea
| | - Young-Kwon Park
- School of Environmental Engineering, University of Seoul, Seoul 02504, Republic of Korea.
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Kim SH, Cha JS, Jeon YS, Park BC, Shin MC, Song JK, Kim YK. Catalytic activity of vanadium oxide catalysts prepared by electrodeposition for the selective catalytic reduction of nitrogen oxides with ammonia. Reac Kinet Mech Cat 2016. [DOI: 10.1007/s11144-016-1010-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Cha JS, Cooksey DA. Copper Hypersensitivity and Uptake in Pseudomonas syringae Containing Cloned Components of the Copper Resistance Operon. Appl Environ Microbiol 2010; 59:1671-4. [PMID: 16348944 PMCID: PMC182136 DOI: 10.1128/aem.59.5.1671-1674.1993] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Copper resistance in Pseudomonas syringae carrying the copABCD operon is associated with accumulation of copper in the periplasm and outer membrane, apparently as a function of the copper-binding activities of the copABC gene products. However, no specific function for copD has been determined. In this study, P. syringae cells containing copCD or copBCD cloned behind the lac promoter were hypersensitive to copper. An increased accumulation of copper was measured in cells containing several combinations of cop genes that included copC and copD. Our data suggest that CopC, a periplasmic copper-binding protein, and CopD, a probable inner membrane protein, may function together in copper uptake.
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Affiliation(s)
- J S Cha
- Department of Plant Pathology, University of California, Riverside, California 92521-0122
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Abstract
Copper-resistant strains of Xanthomonas campestris pv. vesicatoria, Pseudomonas cichorii, Pseudomonas putida, Pseudomonas fluorescens, and a yellow Pseudomonas sp. were isolated from tomato plants or seeds. In Southern hybridizations, DNA from each strain showed homology with the copper resistance (cop) operon previously cloned from Pseudomonas syringae pv. tomato PT23. Homology was associated with plasmid and chromosomal DNA in X. compestris pv. vesicatoria, P. putida, and the yellow Pseudomonas sp. Homology was detected only in the chromosomal DNA of P. cichorii and P. fluorescens. Homology with cop was also detected in chromosomal DNA from copper-sensitive strains of P. cichorii, P. fluorescens, and P. syringae pv. tomato, suggesting that the cop homolog may be indigenous to certain Pseudomonas species and have some function other than copper resistance. No homology was detected in DNA from a copper-sensitive X. campestris pv. vesicatoria strain. Copper-inducible protein products were detected in each copper-resistant bacterium by immunoblot analysis with antibodies raised to the CopB protein from the cop operon. The role of the homologous DNA in copper resistance was confirmed for the X. campestris pv. vesicatoria strain by cloning and transferring the cop homolog to a copper-sensitive strain of X. campestris pv. vesicatoria. The possibility and implications of copper resistance gene exchange between different species and genera of pathogenic and saprophytic bacteria on tomato plants are discussed.
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Affiliation(s)
- D A Cooksey
- Department of Plant Pathology, University of California, Riverside, California 92521-0122
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Cha JS, Moon SJ, Park JH. A solution of borane in tetrahydrofuran. A stereoselective reducing agent for reduction of cyclic ketones to thermodynamically more stable alcohols. J Org Chem 2001; 66:7514-5. [PMID: 11681970 DOI: 10.1021/jo010401c] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- J S Cha
- Department of Chemistry and Institute of Natural Sciences, Yeungnam University, Gyongsan 712-749, Republic of Korea.
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Cha JS, Pujol C, Kado CI. Identification and characterization of a Pantoea citrea gene encoding glucose dehydrogenase that is essential for causing pink disease of pineapple. Appl Environ Microbiol 1997; 63:71-6. [PMID: 8979341 PMCID: PMC168304 DOI: 10.1128/aem.63.1.71-76.1997] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Pantoea citrea, a member of the family Enterobacteriaceae, causes pink disease of pineapple, whose symptom is characterized by the formation of pink to brown discolorations of the infected portions of the pineapple fruit cylinder upon canning. Molecular genetic approaches were applied to elucidate the mechanism responsible for this fruit discoloration. A P. citrea mutant strain, CMC6, defective in its ability to cause pink disease and fruit discoloration, was generated by nitrosoguanidine mutagenesis. A DNA fragment that restored these activities was isolated by screening a genomic cosmid library of P. citrea. A large open reading frame of 2,361 bp, identified by nucleotide sequencing of a subclone of the complementing DNA, showed high similarities to identified genes encoding glucose dehydrogenase (GDH) in Escherichia coli, Acinetobacter calcoaceticus, and Gluconobacter oxydans. The predicted amino acid sequence of GDH of P. citrea was identical to known GDHs in these bacteria by 54, 44, and 34%, respectively. GDH of P. citrea has a predicted molecular mass of 86.2 kDa, contains a conserved binding domain for the cofactor pyrroloquinoline quinone, and possesses GDH activity as demonstrated by biochemical assay. GDH is the key branch point enzyme leading to the biosynthesis of gluconate, which in turn serves as the substrate leading to the formation of 2-ketogluconate, 2,5-diketogluconate, 6-phosphogluconate, and 2-keto-6-phosphogluconate. Addition of gluconate to CMC6 restores the juice- and fruit-discoloring activity. Although the pigments formed by heating (or canning) have not been identified, it is clear that GDH is one of the enzymes required for pigment formation leading to pink disease.
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Affiliation(s)
- J S Cha
- Department of Plant Pathology, University of California, Davis 95616, USA
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Abstract
Copper-resistant strains of Pseudomonas syringae pathovar tomato accumulate copper and develop blue colonies on copper-containing media. Three of the protein products of the copper-resistance operon (cop) were characterized to provide an understanding of the copper-resistance mechanism and its relationship to copper accumulation. The Cop proteins, CopA (72 kDa), CopB (39 kDa), and CopC (12 kDa), were produced only under copper induction. CopA and CopC were periplasmic proteins and CopB was an outer membrane protein. Leader peptide sequences of CopA, CopB, and CopC were confirmed by amino-terminal peptide sequencing. CopA, CopB, and CopC were purified from strain PT23.2, and their copper contents were determined. One molecule of CopA bound 10.9 +/- 1.2 atoms of copper and one molecule of CopC bound 0.6 +/- 0.1 atom of copper. The Cop proteins apparently mediate sequestration of copper outside of the cytoplasm as a copper-resistance mechanism.
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Affiliation(s)
- J S Cha
- Department of Plant Pathology, University of California, Riverside 92521-0122
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Cha JS. [New method for evaluation of student's practice]. Taehan Kanho 1970; 9:47-52. [PMID: 5276135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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