Enhanced Photodegradation of Paper-making Wastewater by Two-dimensional Heterojunction of Titania Plates with Exposed {001} Facets-Graphene Composite

2017 International Conference on Environmental and Energy Engineering

生态环境科学;能源学

Liu, Yiming^1 ; Wang, Chunxiao^1 ; Shen, Tingting^1 ; Liu, Qing^1 ; Sun, Jing^1 ; Wang, Xikui^2

Department of Environmental Science and Engineering, Qilu University of Technology, Jinan

250353, China^1

Chemistry and Pharmaceutical Engineering, Qilu University of Technology, Jinan

250353, China^2

关键词: Graphene composites;    Graphene nanosheets;    Industrial wastewaters;    Papermaking wastewater;    Photocatalytic efficiency;    Photocatalytic performance;    Solvothermal method;    Structure and morphology;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/63/1/012019/pdf
DOI  :  10.1088/1755-1315/63/1/012019

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

As a typical industrial wastewater, paper-making wastewater contains a number of toxic compounds which is harmful to the environment. In this report, TiO2plates/graphene composite based 2D-2D heterojunctions were synthesized via one-step solvothermal method. The structure and morphology of the as-prepared composite were characterized by Transmission electron microscope (TEM), X-ray diffraction (XRD), and Raman spectra. The results indicated that sheet-like anatase TiO2with exposed {001} facets was anchored on the graphene nanosheet. In the degradation of papermaking wastewater under UV irradiation, the as synthesized TiO2plates/graphene composite exhibited higher photocatalytic performance than the commercial Degussa P25. The effects of the amount of catalyst, H2O2dosage, pH and the time of light irradiation on the photocatalytic efficiency were also discussed. At the optimum condition of 1.0 g •L-1RGO/TiO2with the dosage of 0.3% H2O2at pH=3, the removal rate of CODCrand chroma could reach 86% and 100%, respectively in 8 h. This work could provide new insights into the wastewater treatment with a well-defined nanocomposite.