AI Jianping 1, LI Meng 1, HU Liling 2, DUO Shuwang 1, LIN Mengting 1, CHENG Lihong 1, ZHOU Zehua 1, LI Wenkui 1
(1. College of Materials and Mechatronics, Jiangxi Science and Technology Normal University, Nanchang 330038, Jiangxi, China; 2. College of Chemistry and Chemical Engineering, Jiangxi Science and Technology Normal University, Nanchang 330038, Jiangxi, China)
Abstract: Magnetic MFe2O4 (M = Co,Zn)/reduced graphene oxide (MFe2O4/rGO) nanocomposites were prepared by using a solvothermal method. Physical and chemical properties of the nanocomposites were characterized. The effect of ethylenediamine tetraacetic acid (EDTA) ion on photo-Fenton catalytic activity of the magnetic MFe2O4 (M=Co,Zn)/reduced graphene oxide (rGO) composites was studied in detail. Photo-Fenton catalytic activity and recycling performance of the MFe2O4 (M = Zn,Co)-rGO + EDTA + H2O2 systems were evaluated through the degradation of different organic dyes under the irradiation of simulated sunlight at approximately neutral pH values. Comparatively, the MFe2O4 (M = Zn,Co)-rGO + EDTA + H2O2 systems exhibited enhanced catalytic degradation performance for both the cationic and anionic dyes. Moreover, photo-Fenton catalytic activity of the ZnFe2O4-rGO+EDTA+ H2O2 system was higher than that of the CoFe2O4-rGO+EDTA+H2O2 system. The former had an RhB degradation rate of up to 92.1% after 5 min of light exposure, which is the highest concentration of hydroxyl radicals (•OH) produced in the reaction system that accelerated the degradation of organic dyes. In addition, possible mechanism for the enhanced oxidization of organic dyes over the MFe2O4 (M = Zn, Co)-rGO + EDTA + H2O2 system was proposed according to the experimental results.
Key words: activated complex; heterogeneous photo-Fenton catalyst; magnetically separable; visible-light degradation