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Effects of pH value on photocatalytic performance of ZnO composite graphene for degradation of methyl orange



  1. School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan, 523808, China
  2. College of Environment and Safe Engineering, Qingdao University of Science & Technology, Qingdao, 266042, China
  3. Key Laboratory of Pulp and Paper Science & Technology of Ministry of Education of China, Qilu University of Technology, Jinan 250353, China


The ZnO nanoparticles were coated with an appropriate amount of graphene oxide. The structure, surface morphology and Band gap of ZnO/graphene were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and UV-vis absorption spectra. The effect of PH on the photocatalytic degradation of methyl orange using ZnO/ graphene composites under visible light was studied. The research indicated that ZnO/graphene photocatalyst showed enhanced effect for the degradation of Methyl orange in pH=3-5. Cycle degradation in different pH environment, and a cyclic degradation of recovered sample by scanning electron microscope showed that the presence of graphene has a protective effect on ZnO, which was able to inhibit the corrosion of ZnO in acidic environment, and improve the stability of its repeated degradation. As can be seen from photoluminescence spectroscopy experiments of ZnO /graphene and ZnO, the existence of graphene can effectively accelerate the separation efficiency of ZnO photogenerated electrons and holes, improving the photocatalytic degradation efficiency, which provides a theoretical basis for ZnO/graphene degrading dye wastewater in different pH especially in acidic environment..


pH, ZnO/graphene, Photocatalytic, Degradation, Methyl orange.

Submitted at: May 25, 2017
Accepted at: June 7, 2018


SHANHONG LAN, HAO ZHANG, JUNJIE HU, SHIWEN GENG, HUIXIA LAN, Effects of pH value on photocatalytic performance of ZnO composite graphene for degradation of methyl orange, Journal of Optoelectronics and Advanced Materials Vol. 20, Iss. 5-6, pp. 337-345 (2018)