化工进展 ›› 2019, Vol. 38 ›› Issue (9): 4085-4094.DOI: 10.16085/j.issn.1000-6613.2018-2317

• 工业催化 • 上一篇    下一篇

SiO2/BiOBr光催化材料制备及其对含油废水的处理

仇宏暄1(),余义昌2,黎城君1,郜洪文1()   

  1. 1. 同济大学环境科学与工程学院,上海 200092
    2. 重庆市环境科学研究院环境工程技术研究中心,重庆 401147
  • 收稿日期:2018-11-28 出版日期:2019-09-05 发布日期:2019-09-05
  • 通讯作者: 郜洪文
  • 作者简介:仇宏暄(1995—),男,硕士研究生,研究方向为含油废水的处理。E-mail:sharpqiu@126.com
  • 基金资助:
    政府间国际科技创新合作重点项目(2016YFE0123800);重庆市科研机构绩效激励引导专项(cstc2018jxjl2017)

Preparation of SiO2/BiOBr photocatalytic materials and treatment ofoily wastewater

Hongxuan QIU1(),Yichang YU2,Chengjun LI1,Hongwen GAO1()   

  1. 1. College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
    2. Environmental Engineering Technology Research Center, Chongqing Academy of Environmental Sciences, Chongqing 401147,China
  • Received:2018-11-28 Online:2019-09-05 Published:2019-09-05
  • Contact: Hongwen GAO

摘要:

近几年来,水体中油污污染问题已引起广泛关注。许多研究尝试利用光催化材料催化降解含油废水,但催化条件大多仍局限于紫外光照。为解决这一问题,本研究将SiO2作为催化剂载体,采用共沉淀法制备出能在可见光下使用的SiO2/BiOBr复合材料。该材料经XRD、XPS、DRS、BET等测试分析后发现,BiOBr可负载于SiO2的片层表面,同时可有效增大其比表面积,提高吸附性能。并且将制备条件优化后表明,当n(Bi)∶n(Si)=1∶1时,该材料的比表面积为83.53m2/g,禁带宽度(E g)为2.79eV,复合效果最佳。使用该复合材料对不同类型油进行催化反应后,机油、柴油、食用油的去除率分别可达25%、60%、93%。本文详细分析了该材料柴油的光降解机理,发现·O2 -是最为主要的活性基团。

关键词: 催化剂, 二氧化硅, 复合材料, 含油废水处理, 环境

Abstract:

In recent years, oil pollution in water has caused wide concerns. Many studies have attempted to catalyze the degradation of oily wastewater by photocatalytic materials, but most techniques are still limited to ultraviolet light. In order to solve this problem, SiO2/BiOBr composites which can be used under visible light were prepared by coprecipitation method using SiO2 as the catalyst carrier. The material was characterized by XRD, XPS, DRS, BET and so on. It was found that BiOBr can be supported on the surface of SiO2, and it can effectively increase the specific surface area of SiO2, and thus can improve the adsorption performance. With n(Bi)∶n(Si)=1∶1, the specific surface area and the forbidden band width (E g) of the material was 83.53m2/g and 2.79eV respectively, resulting in the best performance. When the composite material was used to catalyze different types of oily wastewater, the removal rates of engine oil, diesel oil and edible oil were up to 25%, 60% and 93%, respectively. Further, the photodegradation mechanism of diesel oil was analyzed in detail, and it was found that ·O2 - was the most active group.

Key words: catalyst, silica, composites, treatment of oily wastewater, environment

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