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마이크로 기공 알루미나 기판위에 스프레이 코팅된 ZnO 고정막의 광촉매 성질을 이용한 사진폐액으로 부터 Ag이온 회수
김홍식,안정민,박성 明知大學校 産業技術硏究所 2009 産業技術硏究所論文集 Vol.28 No.-
ZnO nanopowders were synthesized by solution combustion method(SCM) and their average particle size was about 30nm. They were immobilized on microporous alumina substrates by spray coating. The microporous alumina substrates were prepared by anodization and the average pore size was about 150nm. Ag ions were tried to be recovered from waste photograph developing solution by photocatalytic reaction. Three kinds of samples were prepared to compare their photocatalytic efficiency commercial ZnO powders (slurry type reaction), SCM ZnO powders immobilized on normal alumina substrates and SCM ZnO powders immobilized on anodized alumina substrates. The commercial ZnO powders without immobilization did not sbow any photocatalytic reaetion even though they have maximum surface area. This is probably ascribed to their poor cristalline quality. However, the Ag ions recovery rate by SCM ZnO powders immobilized on anodized alumina substrates was about 2.5 times higher than that by SCM ZnO powders immobilized on normal alumina substrates. This big difference in photocatalytic efficiency is probably due to the large surface area of the anodized alumina. This result was correspondent to photoluminescence measurement results.