广西师范大学学报（自然科学版） ›› 2016, Vol. 34 ›› Issue (4): 60-69.doi: 10.16088/j.issn.1001-6600.2016.04.010

• 广西高校优秀中青年骨干教师培养工程论坛 • 上一篇    下一篇

方形花状Bi2WO6可见光催化降解制革废水

陈渊1,2,3,杨家添1,2,3,韦庆敏1,2,3,晏全1,2,3,黎中良1,2,3,秦颖瑜1,2,3   

  1. 1.玉林师范学院广西农产资源化学与深度利用重点实验室培育基地,广西玉林537000;
    2. 玉林师范学院广西高校桂东南特色农产资源高效利用重点实验室,广西玉林537000;
    3. 玉林师范学院化学与食品科学学院,广西玉林537000
  • 收稿日期:2016-06-23 出版日期:2016-07-18 发布日期:2018-07-18
  • 通讯作者: 陈渊(1971—),女,广西博白人,玉林师范学院教授。E-mail:chenyuan197191@163.com
  • 基金资助:
    广西科学研究与技术开发计划项目(桂科攻1598007-1);广西教育厅科研项目(KY2015ZD097,LX2014295);广西理工科学实验中心开放课题(LGZXKF201111);玉林师范学院教授科研启动基金(G20140006);全国大学生创新创业训练计划项目(201510606021,201610606008)

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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摘要： 以Bi(NO3)3·5H2O和Na2WO3·2H2O为原料,EDTA为络合剂,辅助水热法合成Bi2WO6光催化剂,采用X射线衍射(XRD)、扫描电镜(SEM)、拉曼光谱(Raman)、紫外—可见漫反射光谱(DRS)等测试手段对产品进行表征。同时,在Bi2WO6光催化降解制革废水反应中考察了催化剂投加量、空气通入量、溶液pH值、双氧水用量及光照强度对制革废水CODcr去除率的影响。结果表明,Bi2WO6光催化剂的结晶度良好,具有Bi2WO6特征峰,为规则方形花状Bi2WO6,其带隙能为2.696 eV。Bi2WO6能有效降解制革废水中的有机物质,废水的CODcr去除率显著提高。通过正交实验确定了降解制革废水最佳工艺条件为:Bi2WO6光催化剂的投加量为2.0 g/L,自然pH值,体积分数2% H2O2,空气通入量为中档,灯液光照距离为11 cm,可见光照射3.0 h。该条件下,制革废水的脱色率和CODcr去除率分别达到91.5%和92.6%,达到了国家相关排放标准。Bi2WO6晶体的可见光催化降解制革废水过程符合一级反应速率动力学方程。

关键词: Bi2WO6, 水热法, 制革废水, 脱色率, CODcr去除率

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

中图分类号: 

  • TQ032.4
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