Journal of Guangxi Normal University(Natural Science Edition) ›› 2016, Vol. 34 ›› Issue (4): 60-69.doi: 10.16088/j.issn.1001-6600.2016.04.010

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Photocatalytic Degradation of Tannery Wastewater by Square Flower-like Bi2WO6 under Visible Light

CHEN Yuan1,2,3,YANG Jiatian1,2,3,WEI Qingmin1,2,3,YAN Quan1,2,3,LI Zhongliang1,2,3,QIN Yingyu1,2,3   

  1. 1. Guangxi Key Laboratory for Agricultural Resources Chemistry and Efficient Utilization Cultivation Base, Yulin Normal University, Yulin Guangxi 537000;
    2. Colleges and Universities Key Laboratory for Efficient Use of Agricultural Resources in the Southeast of Guangxi, Yulin Normal University, Yulin Guangxi 537000, China;
    3. College of Chemistry and Food Science, Yulin Normal University, Yulin Guangxi 537000, China
  • Received:2016-06-23 Online:2016-07-18 Published:2018-07-18

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Abstract: Using Bi(NO3)3·5H2O and Na2WO3·2H2O as raw materials, Bi2WO6 was successfully synthesized by hydrothermal method with ethylenediamine tetraacetic acid (EDTA) as the chelating agent. The properties of the as-prepared samples were investigated by XRD, SEM, Raman and UV-vis DRS tests. The as-prepared products were used to photodegrade tannery wastewater. The effects of dosage of Bi2WO6 photocatalyst, air flow rate, pH of wastewater, H2O2 dosage and the illumination intensity on the wastewater degradation were investigated in detail. The results showed that highly crystallinity square flower-like Bi2WO6 with its band gap of 2.696 eV could be obtained via a hydrothermal route assisted by EDTA. The Bi2WO6 could effectively degrade the hardly-degraded organic pollutants, and the CODcr removal rate increased significantly. The optimum conditions of treatment of tannery wastewater were natural pH value, Bi2WO6 of 2 g/L, H2O2 of 2%, amount of air of mid-range, distance of light liquid light of 11 cm, reaction time of 3.0 h. Under the optimal conditions, the decolorization rate and CODcr removal rate were 91.5% and 92.6%. The dynamic behavior of Bi2WO6 photocatalyst degrading the molasses fermentation wastewater agrees with the first-order rate dynamic equation.

Key words: Bi2WO6, hydrothermal method, tannery wastewater, decolorization rate, CODcr removal

CLC Number: 

  • TQ032.4
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