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  • 02월 28일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제123회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Oxidative Degradation of Refractory Contaminants Mediated by Surface SO4•- Immobilized on Metal Oxides

2019년 1월 18일 14시 32분 05초
PHYS.P-82 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
4월 19일 (금요일) 11:00~12:30
Physical Chemistry
저자 및
Yun Jeong Choe, Sang Hoon Kim, Jongsik Kim*
Materials Architecturing Research Center, Korea Institute of Science and Technology, Korea
OH has been regarded as one of potent oxidants to degrade aqueous pollutants, yet, oftentimes remains challenging in terms of its proficient utilization as a recalcitrants’ consumer. This is because of 1) a short lifetime of OH active in decomposing pollutants under a narrow pH span, 2) a limited quantity of H2O2 activators (Mδ+, M: metal; δ ≤ 2) to form OH, 3) oxidation of Mδ+ species to form M3+ analogues sluggish to dissect H2O2, and 4) severe leaching of Mδ+ species to catalyze H2O2 scission via heterogeneous catalysis. In contrast, SO4•- was reported to provide several benefits relative to OH such as 1) a longer lifetime and 2) a greater oxidation ability over a wide pH range, yet, could not be free from serious leaching of S2O8- activators (Mδ+) to from SO4•- species used to oxidize aqueous contaminants. This presentation highlights an adaptable synthetic method of SO42--functionalized metal oxide platforms to sustain the degradation of contaminants via unique heterogeneous catalytic pathway. Specifically, both Mδ+ and SO42- species are populated on the surfaces of metal oxides, wherein Mδ+ species catalytically cleave aqueous H2O2 to produce OH, whereas SO42- functionalities are excited by radicals from aqueous OH species and thus are transformed into surface SO4•- species. This presentation also showcases kinetic analysis on a series of controlled reaction runs. This was used to conclude 1) ‘H2O2OH↔SO42-↔SO4•- pathway’ is greatly feasible and 2) ‘surface SO4•- species’ are ‘major’ active sites to consume pollutants with great activity and ‘recyclability’ via ‘heterogeneous catalysis’.