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Jin Wook Chung - One of the best experts on this subject based on the ideXlab platform.
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evaluation of potential for reuse of industrial wastewater using metal Immobilized Catalysts and reverse osmosis
Chemosphere, 2015Co-Authors: Jeongyun Choi, Jin Wook ChungAbstract:This report describes a novel technology of reusing the wastewater discharged from the display manufacturing industry through an advanced oxidation process (AOP) with a metal-Immobilized Catalyst and reverse osmosis (RO) in the pilot scale. The reclaimed water generated from the etching and cleaning processes in display manufacturing facilities was low-strength organic wastewater and was required to be recycled to secure a water source. For the reuse of reclaimed water to ultrapure water (UPW), a combination of solid-phase AOP and RO was implemented. The removal efficiency of TOC by solid-phase AOP and RO was 92%. Specifically, the optimal acid, pH, and H2O2 concentrations in the solid-phase AOP were determined. With regard to water quality and operating costs, the combination of solid-phase AOP and RO was superior to activated carbon/RO and ultraviolet AOP/anion polisher/coal carbon.
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Reuse of Semiconductor Wastewater Using Reverse Osmosis and Metal-Immobilized Catalyst-Based Advanced Oxidation Process
Industrial & Engineering Chemistry Research, 2014Co-Authors: Jeongyun Choi, Jin Wook ChungAbstract:This report describes an efficient hybrid treatment process that recycles semiconductor wastewater by reverse osmosis (RO) and advanced oxidation process (AOP) with metal-Immobilized Catalysts based on activated carbon. High-loading organic wastewater was pretreated biologically using a membrane bioreactor, and the remaining organic compounds were filtered by RO and oxidized chemically by AOP. The recycling of the final effluent to ultrapure water (UPW) was evaluated using a pilot-scale UPW production system. AOP with a metal Catalyst improved the oxidation of low-molecular-weight organic compounds, such as acetonitrile and acetaldehyde, in electronics wastewater. The pilot-scale RO and AOP with a metal Catalyst were performed under optimal conditions and satisfied the water quality standards for UPW. We conclude that the proposed hybrid process is a powerful tool that can be used to recycle electronics wastewater and satisfy the water quality standards for UPW.
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Degradation of acetone and isopropylalcohol in electronic wastewater using Fe- and Al-Immobilized Catalysts
Chemical Engineering Journal, 2013Co-Authors: Jeongyun Choi, Joon-hee Jeong, Jin Wook ChungAbstract:This paper describes a novel technology for the reuse of electronic wastewater by advanced oxidation process (AOP) using an Fe/Al-Immobilized Catalyst. The metal Catalyst in the AOP improved the oxidation of low-molecular-weight organic compounds, such as acetone and isopropylalcohol, in electronic wastewater. The removal efficiency of acetone and isopropylalcohol were 78.5% and 99.9%, respectively. The optimal combination of metal Catalysts in the oxidation of acetone was Fe and Al—10% Al in various Fe/Al Catalysts. The optimal pH was less than 3, and the proper addition of H2O2 and Catalysts was an important factor in the AOP. Using optimal metal Catalysts, significant amounts of organic compounds were removed from raw electronic wastewater using a continuous flow reactor. We conclude that an AOP with a metal Catalyst removes low-molecular-weight organic compounds (91% removal efficiency of isopropylalcohol) and can be implemented as a wastewater treatment and reuse system.
Krzysztof Matyjaszewski - One of the best experts on this subject based on the ideXlab platform.
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Fundamentals of Supported Catalysts for Atom Transfer Radical Polymerization (ATRP) and Application of an Immobilized/Soluble Hybrid Catalyst System to ATRP
Macromolecules, 2002Co-Authors: Sung Chul Hong, Krzysztof MatyjaszewskiAbstract:A series of hybrid Catalysts, comprising a tethered ligand Immobilized Catalyst operating in conjunction with a small amount of soluble Catalyst, were evaluated for atom transfer radical polymerization (ATRP). The level of control over the ATRP of vinyl monomers was significantly improved by the addition of part per million levels of a soluble Catalyst, or soluble Catalyst precursor, to the Immobilized Catalyst. Use of a hybrid Catalyst system for polymerization of vinyl monomers such as MMA, MA, and styrene provided polymers with a predetermined molecular weight and a narrow molecular weight distribution. The Immobilized Catalyst can be removed from the polymerization by simple filtration, or sedimentation, affording a colorless transparent polymer solution with a salient reduction in the concentration of any residual transition metal in the final polymeric products.
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An Immobilized/Soluble Hybrid Catalyst System for Atom Transfer Radical Polymerization
Macromolecules, 2001Co-Authors: Sung Chul Hong, Hyun-jong Paik, Krzysztof MatyjaszewskiAbstract:A new two-component Catalyst system consisting of an Immobilized Catalyst and a soluble Catalyst in ppm quantities was applied to atom transfer radical polymerization (ATRP). A high conversion of monomer (>90%) was achieved with a predetermined molecular weight and narrow molecular weight distribution (Mw/Mn = 1.1−1.3) in the ATRP of methyl methacrylate and methyl acrylate. The Immobilized Catalyst was removed by a filtration or sedimentation procedure. The casting of the reaction solution afforded clear and colorless polymer films. It was confirmed by the inductively coupled plasma (ICP) analysis that the residual amount of Cu in the resulting polymer was as low as 20 ppm.
Jeongyun Choi - One of the best experts on this subject based on the ideXlab platform.
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evaluation of potential for reuse of industrial wastewater using metal Immobilized Catalysts and reverse osmosis
Chemosphere, 2015Co-Authors: Jeongyun Choi, Jin Wook ChungAbstract:This report describes a novel technology of reusing the wastewater discharged from the display manufacturing industry through an advanced oxidation process (AOP) with a metal-Immobilized Catalyst and reverse osmosis (RO) in the pilot scale. The reclaimed water generated from the etching and cleaning processes in display manufacturing facilities was low-strength organic wastewater and was required to be recycled to secure a water source. For the reuse of reclaimed water to ultrapure water (UPW), a combination of solid-phase AOP and RO was implemented. The removal efficiency of TOC by solid-phase AOP and RO was 92%. Specifically, the optimal acid, pH, and H2O2 concentrations in the solid-phase AOP were determined. With regard to water quality and operating costs, the combination of solid-phase AOP and RO was superior to activated carbon/RO and ultraviolet AOP/anion polisher/coal carbon.
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Reuse of Semiconductor Wastewater Using Reverse Osmosis and Metal-Immobilized Catalyst-Based Advanced Oxidation Process
Industrial & Engineering Chemistry Research, 2014Co-Authors: Jeongyun Choi, Jin Wook ChungAbstract:This report describes an efficient hybrid treatment process that recycles semiconductor wastewater by reverse osmosis (RO) and advanced oxidation process (AOP) with metal-Immobilized Catalysts based on activated carbon. High-loading organic wastewater was pretreated biologically using a membrane bioreactor, and the remaining organic compounds were filtered by RO and oxidized chemically by AOP. The recycling of the final effluent to ultrapure water (UPW) was evaluated using a pilot-scale UPW production system. AOP with a metal Catalyst improved the oxidation of low-molecular-weight organic compounds, such as acetonitrile and acetaldehyde, in electronics wastewater. The pilot-scale RO and AOP with a metal Catalyst were performed under optimal conditions and satisfied the water quality standards for UPW. We conclude that the proposed hybrid process is a powerful tool that can be used to recycle electronics wastewater and satisfy the water quality standards for UPW.
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Degradation of acetone and isopropylalcohol in electronic wastewater using Fe- and Al-Immobilized Catalysts
Chemical Engineering Journal, 2013Co-Authors: Jeongyun Choi, Joon-hee Jeong, Jin Wook ChungAbstract:This paper describes a novel technology for the reuse of electronic wastewater by advanced oxidation process (AOP) using an Fe/Al-Immobilized Catalyst. The metal Catalyst in the AOP improved the oxidation of low-molecular-weight organic compounds, such as acetone and isopropylalcohol, in electronic wastewater. The removal efficiency of acetone and isopropylalcohol were 78.5% and 99.9%, respectively. The optimal combination of metal Catalysts in the oxidation of acetone was Fe and Al—10% Al in various Fe/Al Catalysts. The optimal pH was less than 3, and the proper addition of H2O2 and Catalysts was an important factor in the AOP. Using optimal metal Catalysts, significant amounts of organic compounds were removed from raw electronic wastewater using a continuous flow reactor. We conclude that an AOP with a metal Catalyst removes low-molecular-weight organic compounds (91% removal efficiency of isopropylalcohol) and can be implemented as a wastewater treatment and reuse system.
Sung Chul Hong - One of the best experts on this subject based on the ideXlab platform.
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Fundamentals of Supported Catalysts for Atom Transfer Radical Polymerization (ATRP) and Application of an Immobilized/Soluble Hybrid Catalyst System to ATRP
Macromolecules, 2002Co-Authors: Sung Chul Hong, Krzysztof MatyjaszewskiAbstract:A series of hybrid Catalysts, comprising a tethered ligand Immobilized Catalyst operating in conjunction with a small amount of soluble Catalyst, were evaluated for atom transfer radical polymerization (ATRP). The level of control over the ATRP of vinyl monomers was significantly improved by the addition of part per million levels of a soluble Catalyst, or soluble Catalyst precursor, to the Immobilized Catalyst. Use of a hybrid Catalyst system for polymerization of vinyl monomers such as MMA, MA, and styrene provided polymers with a predetermined molecular weight and a narrow molecular weight distribution. The Immobilized Catalyst can be removed from the polymerization by simple filtration, or sedimentation, affording a colorless transparent polymer solution with a salient reduction in the concentration of any residual transition metal in the final polymeric products.
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An Immobilized/Soluble Hybrid Catalyst System for Atom Transfer Radical Polymerization
Macromolecules, 2001Co-Authors: Sung Chul Hong, Hyun-jong Paik, Krzysztof MatyjaszewskiAbstract:A new two-component Catalyst system consisting of an Immobilized Catalyst and a soluble Catalyst in ppm quantities was applied to atom transfer radical polymerization (ATRP). A high conversion of monomer (>90%) was achieved with a predetermined molecular weight and narrow molecular weight distribution (Mw/Mn = 1.1−1.3) in the ATRP of methyl methacrylate and methyl acrylate. The Immobilized Catalyst was removed by a filtration or sedimentation procedure. The casting of the reaction solution afforded clear and colorless polymer films. It was confirmed by the inductively coupled plasma (ICP) analysis that the residual amount of Cu in the resulting polymer was as low as 20 ppm.
A A C M Beenackers - One of the best experts on this subject based on the ideXlab platform.
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modeling the photocatalytic degradation of formic acid in a reactor with Immobilized Catalyst
Chemical Engineering Science, 2002Co-Authors: M F J Dijkstra, H J Panneman, J G M Winkelman, J J Kelly, A A C M BeenackersAbstract:A kinetic model for the photocatalytic degradation of formic acid in an Immobilized system is presented, including the dependency of the reaction rate on the concentration of formic acid and oxygen, the Catalyst layer thickness and the light flux. In the system some external mass transfer limitation occurs which is included in the modeling with experimentally determined values for the mass transfer coefficient of both formic acid and oxygen. The model describes the measurements well. The degradation rate appears to depend linearly on the light intensity. The adsorption of formic acid and oxygen on the Catalyst layer appears to play an important role in the degradation rate.
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polyhipe a new polymeric support for heterogeneous catalytic reactions kinetics of hydration of cyclohexene in two and three phase systems over a strongly acidic sulfonated polyhipe
Industrial & Engineering Chemistry Research, 2000Co-Authors: Marcel Ottens, G Leene, A A C M Beenackers, Neil R Cameron, David C SherringtonAbstract:A novel type of highly porous polymeric monolith called PolyHipe has been applied as a support for an Immobilized Catalyst (sulfonic acid). Somewhat differently from a conventional packed bed where the reaction mixture flows around the porous catalytic particles, here, the reaction mixture is forced through the pores of the monolith. The kinetics of the liquid-phase hydration were measured both in a three-phase system consisting of an aqueous, an organic, and the polymer resin phase and in a two-phase system consisting of a solution of cyclohexene in aqueous sulfolane (90 mol % sulfolane) and the polymer resin phase, at a pressure of 2 MPa and temperatures between 343 and 368 K. In the three-phase system the observed conversion rates were analyzed by a three-phase reaction model with mass transfer and reaction based on the rate equation RA = k1psCA − k-1CP (with k1ps = k1*σρPH (with k1ps being the pseudo-first-order reaction rate constant of the forward reaction, k1* the idem, but applied per equivalent a...
