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제112회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Photocatalytic Reduction of Azobenzene Using ZnO - Noble Metal Nanoparticles Composites

2013년 8월 27일 10시 42분 53초
ELEC.O-4 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
금 11시 : 00분
전기화학 - Young Electrochemists Symposium
저자 및
김재현, 이동일*
연세대학교 화학과, Korea
This presentation describes metal effect on the catalytic activities of ZnO nanoparticles coated with noble metal nanoparticles with diameters of 2.4nm (metal = Au, Ag, Pd, and Pt).The ZnO-metal composites were prepared by anchoring glutathione-protected metal nanoparticles on ZnO surface and photocatalytic experiments were conducted with composite colloids under UV-vis light (λ>320 nm) in a deaerated 1:1 (v/v) EtOH-H2O medium.The photocatalytic activity of bare ZnO was found negligible, comparing with ZnO-noble metal composites for reduction of azobenzene. The photolysis time(t1/2) corresponding to 50% reduction of azobenzene was 1.5 min with ZnO-Pd composites which was at least 10 times higher than that of ZnO-other noble metal composites. Similar metal effects have been found in electrocatalytic measurements. In trifluoroacetic acid medium, current reached to 550㎂ and 450㎂ for ZnO-Pt and ZnO-Pd which are 5 fold higher than that of ZnO-Au and ZnO-Ag. Through product analysis of photocatalytic measurements, it was observed that azobenzene has been reduced to hydrazobenzene, accompanying with 2 electron and 2 proton transfer, which is called hydrogenation reaction. It is known that proton is easy to bind with Pd and Pt, and its bonding strength is proper for catalytic hydrogenation. These results demonstrate that the photolysis activity of the composites can be controlled by metal nanoparticles, and the proton is playing an important role in catalytic reduction of azobenzene using ZnO-noble metal composites.