123rd General Meeting of the KCS

Type Poster Presentation
Area Material Chemistry
Room No. Exhibition Hall 2
Time 4월 19일 (금요일) 11:00~12:30
Code MAT.P-449
Subject High Photocatalytic Degradation of Organic Dyes by GO/HNTs/ZnO Nanocomposites under Visible Light Irradiation
Authors Jongik Park, Jewon Lee, Jaegeun Noh1,*
Department of Convergence Nanoscience, Hanyang University, Korea
1Department of Chemistry, Hanyang University, Korea
Abstract ZnO is a semiconductor material with a wide bandgap of 3.4 eV and large exciton binding energy of 60 meV. It also shows optical activity and no photocorrosion effect. With these properties, numerous reports have been studying photocatalytic degradation of organic dyes using ZnO as a catalyst under visible light irradiation. Halloysite nanotubes (HNTs) are an aluminosilicate clay with the kaolin group (Al2Si2O5(OH)4·2H2O). The outer surface of the HNTs comprises a silicate negative charge layer, whereas the inner surface comprises an alumina positive charge layer. Due to these properties, we have found that ZnO effectively adsorbed on the surface of HNTs. HNTs prevent aggregation of ZnO and bring photocatalytic synergy effect. Graphene oxide (GO) consists of hexagonal carbon atoms to sp2 bonds. It has features for photocatalytic application including high surface area, high thermal stability and excellent electron mobility. Taking these advantages, HNTs/ZnO nanocomposites grown on GO are thermally stable during photocatalyst. The photocatalytic degradation of methyl orange (MO) by ZnO and synthesized GO/HNTs/ZnO was compared under visible light irradiation. It was found that photocatalytic degradation ratio of MO using ZnO for 120 min reached 35%, whereas the degradation ratio of MO using GO/HNTs/ZnO for 120 min reached 95%, suggesting that these nanocomposites remarkably enhance the photocatalytic degradation of MO. In addition, we found that these nanocomposites show excellent photocatalytic capability and recycle stability during four cycles.
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