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BiOBr/GO复合纳米光催化剂的制备及可见光下降解环丙沙星废水

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郑乐媚, 关亦玮, 文定, 唐叶如, 李旭辉, 令玉林, 周建红. BiOBr/GO复合纳米光催化剂的制备及可见光下降解环丙沙星废水[J]. 环境化学, 2020, (8): 2137-2146. doi: 10.7524/j.issn.0254-6108.2019070906
引用本文: 郑乐媚, 关亦玮, 文定, 唐叶如, 李旭辉, 令玉林, 周建红. BiOBr/GO复合纳米光催化剂的制备及可见光下降解环丙沙星废水[J]. 环境化学, 2020, (8): 2137-2146. doi: 10.7524/j.issn.0254-6108.2019070906
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ZHENG Lemei, GUAN Yiwei, WEN Ding, TANG Yeru, LI Xuhui, LIN Yuling, ZHOU Jianhong. Preparation of BiOBr/GO composition nanocatalysts and application of degradation of ciprofloxacin wastewater in visible light[J]. Environmental Chemistry, 2020, (8): 2137-2146. doi: 10.7524/j.issn.0254-6108.2019070906
Citation: ZHENG Lemei, GUAN Yiwei, WEN Ding, TANG Yeru, LI Xuhui, LIN Yuling, ZHOU Jianhong. Preparation of BiOBr/GO composition nanocatalysts and application of degradation of ciprofloxacin wastewater in visible light[J]. Environmental Chemistry, 2020, (8): 2137-2146. doi: 10.7524/j.issn.0254-6108.2019070906
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BiOBr/GO复合纳米光催化剂的制备及可见光下降解环丙沙星废水

  • 1. 湖南科技大学生命科学学院, 湘潭, 411201;

  • 2. 湖南科技大学化学化工学院, 湘潭, 411201

    • 通讯作者: 周建红, E-mail: jianhongzhou@163.com
  • 基金项目:

    湖南省大学生研究性学习和创新性实验计划项目（湘教通[2018]255号-521），湖南省教育厅2018年普通高校教学改革研究项目（G21816，湘教通[2018]436号-372：新工科背景下《生化反应工程》研讨式教学改革与探索）和湖南科技大学大学生研究性学习和创新性实验计划项目（201810534049）资助.

Preparation of BiOBr/GO composition nanocatalysts and application of degradation of ciprofloxacin wastewater in visible light

  • 1. School of Life Science, Hunan University of Science and Technology, Xiangtan, 411201, China;

  • 2. School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, 411201, China

    • Corresponding author: ZHOU Jianhong, jianhongzhou@163.com
  • Fund Project: Supported by Hunan University Students Research Learning and Innovative Experimental Project, (Xiangjiaotong[2018] no.255-521)

  • 摘要: 通过改进的Hummers法制备氧化石墨烯（GO）、水热法制得BiOBr，再由GO与BiOBr制备出新型的可见光复合纳米光催化剂BiOBr/GO，并用扫描电子显微镜（SEM）和X-射线衍射（XRD）进行了表征分析.用BiOBr/GO来催化降解环丙沙星溶液，得出最佳的GO与BiOBr的复合配比.探究了环丙沙星溶液的浓度、催化剂的投加量、废水pH值、照射光的波长以及光照强度5个因素对BiOBr/GO的光催化降解性能的影响并研究了催化降解环丙沙星的动力学，最后通过自由基捕获实验探究了BiOBr/GO光催化降解抗生素的机理.实验结果表明，相比于纯的BiOBr，BiOBr/GO有更好的可见光催化性能，其催化降解环丙沙星在浓度较低时符合拟一级动力学，在浓度较高时符合拟二级反应动力学；在优化条件下，即环丙沙星的初始浓度为20 mg·L-1、BiOBr/GO的投加量120 mg、溶液的pH值9.02、照射光的波长400 nm以及光照强度10.1 mW·cm-2时，BiOBr/GO在可见光下，对环丙沙星的去除率达到85%，自由基捕获实验得出·O2-在BiOBr/GO光催化降解中占主导地位.研究结果表明复合材料BiOBr/GO可以在可见光下很好地降解环丙沙星，有望在实际应用中降解抗生素废水.
    Abstract: Graphene (GO) was prepared via an improved Hummers method and BiOBr was synthesized by hydrothermal method. And then a novel composite visible light-driven nanometer photocatalyst BiOBr/GO was constructed. The morphology and structure of the prepared of BiOBr/GO were characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD). The optimized GO/BiOBr ratio was obtained via estimation the photocatalytic performance of the catalyst to degrade ciprofloxacin solution. The effect of five factors that the concentration of cycloproxacin, the amount of the catalyst, the pH of the wastewater, the wavelength of the light and the light intensity were investigated on the degradation efficiency of ciprofloxacin. The kinetics of catalytic degradation of ciprofloxacin was also studied. Finally, the mechanism of BiOBr/GO photocatalytic degradation of antibiotics was explored through free radical capture experiment. The photocatalytic degradation rates were fitted with pseudo-first-order kinetics at low initial substrate concentrations and pseudo-second-order kinetics at high initial concentrations. Under the optimum conditions, the removal rate of cycloproxacin by BiOBr/GO could reach 85% under visible light when the concentration of cycloproxacin was 20 mg·L-1, the amount of catalyst added 120 mg, the value of pH 9.02, the wavelength of the light 400 nm, and the intensity of the light was 10.1 mW·cm-2 respectively. The free radical capture experiment showed that·O2- played a dominant role in BiOBr/GO photocatalytic degradation. The composite BiOBr/GO displayed enhanced visible-light driven photocatalytic activity toward ciprofloxacin, showing a promising application potential for the removal antibiotics in wastewater.
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  • 收稿日期:  2019-07-09

BiOBr/GO复合纳米光催化剂的制备及可见光下降解环丙沙星废水

    通讯作者: 周建红, E-mail: jianhongzhou@163.com
  • 1. 湖南科技大学生命科学学院, 湘潭, 411201;
  • 2. 湖南科技大学化学化工学院, 湘潭, 411201
  • 收稿日期:  2019-07-09
基金项目:

湖南省大学生研究性学习和创新性实验计划项目（湘教通[2018]255号-521），湖南省教育厅2018年普通高校教学改革研究项目（G21816，湘教通[2018]436号-372：新工科背景下《生化反应工程》研讨式教学改革与探索）和湖南科技大学大学生研究性学习和创新性实验计划项目（201810534049）资助.

摘要: 通过改进的Hummers法制备氧化石墨烯（GO）、水热法制得BiOBr，再由GO与BiOBr制备出新型的可见光复合纳米光催化剂BiOBr/GO，并用扫描电子显微镜（SEM）和X-射线衍射（XRD）进行了表征分析.用BiOBr/GO来催化降解环丙沙星溶液，得出最佳的GO与BiOBr的复合配比.探究了环丙沙星溶液的浓度、催化剂的投加量、废水pH值、照射光的波长以及光照强度5个因素对BiOBr/GO的光催化降解性能的影响并研究了催化降解环丙沙星的动力学，最后通过自由基捕获实验探究了BiOBr/GO光催化降解抗生素的机理.实验结果表明，相比于纯的BiOBr，BiOBr/GO有更好的可见光催化性能，其催化降解环丙沙星在浓度较低时符合拟一级动力学，在浓度较高时符合拟二级反应动力学；在优化条件下，即环丙沙星的初始浓度为20 mg·L-1、BiOBr/GO的投加量120 mg、溶液的pH值9.02、照射光的波长400 nm以及光照强度10.1 mW·cm-2时，BiOBr/GO在可见光下，对环丙沙星的去除率达到85%，自由基捕获实验得出·O2-在BiOBr/GO光催化降解中占主导地位.研究结果表明复合材料BiOBr/GO可以在可见光下很好地降解环丙沙星，有望在实际应用中降解抗生素废水.

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