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The TiO2-graphene oxide-Hemin ternary hybrid composite material as an efficient heterogeneous catalyst for the degradation of organic contaminants

TiO2-Graphene Oxide-Hemin (TiO2/GO/Hemin) ternary composite hybrid material was prepared by the sol-gel method and used as a heterogeneous catalyst for the photocatalytic degradation of organic contaminants. The catalytic activity of GO-TiO2-Hemin was evaluated by the degradation of Rhodamine B (RhB) under the UV-visible light irradiation and in the presence of hydrogen peroxide. | Journal of Science Advanced Materials and Devices 4 2019 80e88 Contents lists available at ScienceDirect Journal of Science Advanced Materials and Devices journal homepage www.elsevier.com locate jsamd Original Article The TiO2-graphene oxide-Hemin ternary hybrid composite material as an efficient heterogeneous catalyst for the degradation of organic contaminants C. Munikrishnappa a d Surender Kumar b S. Shivakumara c G. Mohan Rao a N. Munichandraiah d a Department of Instrumentation and Applied Physics Indian Institute of Science Bangalore 560012 India b CSIR - Advanced Materials and Processes Research Institute Bhopal 462026 India c School of Chemical Sciences REVA University Bangalore Karnataka 560064 India d Department of Inorganic and Physical Chemistry Indian Institute of Science Bangalore 560012 India a r t i c l e i n f o a b s t r a c t Article history TiO2-Graphene Oxide-Hemin TiO2 GO Hemin ternary composite hybrid material was prepared by the Received 28 June 2018 sol-gel method and used as a heterogeneous catalyst for the photocatalytic degradation of organic Received in revised form contaminants. The catalytic activity of GO-TiO2-Hemin was evaluated by the degradation of Rhodamine B 14 December 2018 RhB under the UV-visible light irradiation and in the presence of hydrogen peroxide. The ternary Accepted 16 December 2018 Available online 27 December 2018 composite of TiO2 GO Hemin shows an excellent activity over a wide pH range from 3 to 11 and also a stable catalytic activity after five recycles. The increase in the efficiency of TiO2-GO-Hemin-UV processes is attributed to the Fe2þ ions produced from the cleavage of stable iron complexes which participate in Keywords Photocatalysis the continuous cyclic process for the generation of hydroxyl radicals resulting from the heterogeneous Advance oxidation processes AOPs photocatalytic reactions and the adsorption power of GO. Metal ligand charge transfer processes 2019 Publishing services by Elsevier B.V. on