自掺杂BiOBr的制备与光催化性能研究

发布时间：2018-06-07 07:34

  本文选题：BiOBr + 自掺杂　； 参考：《西南石油大学》2017年硕士论文

【摘要】：油气井压裂作业后产生的废水已成为当前主要的油田废水之一,此类废水具有高COD、高浊度、高粘度难处理等特点,特别是压裂废中聚合物的处理极其棘手,若不经处理直接外排会对周围的环境造成严重的污染。光催化技术作为一种绿色经济环保技术,将其应用于处理压裂废水可避免传统处理方法所具备的高投资、二次化学污染等缺点,为处理当面压裂废水的提供一种新思路。本文采用自掺杂方式对BiOBr光催化材料进行改性研究,以提高BiOBr光催化材料光催化性能,并用于处理难降解的压裂废水中大量存在的羟丙基胍胶。本文的具体研究内容和结论如下:1.以五水硝酸铋(Bi(NO_3)_(3.)5H)2O)为实验的铋源,研究溴源、反应溶剂、铋掺杂量、溶剂热时间、溶剂热温度对铋掺杂BiOBr光催化活性的影响。光催化降解实验结果表明,当以十六烷基三甲基溴化铵(CTAB)为溴源,乙二醇为反应溶剂,Bi:Br=1.2:1,溶剂热时间为16h,溶剂热温度为140℃时所制备的铋掺杂BiOBr光催化剂的光催化性能较为优异,且在可见光照射80min后,光催化效率达到99.4%。2.采用溶剂热方法制备溴掺杂BiOBr光催化材料,研究溴掺杂量、溶剂热时间、溶剂热温度对溴掺杂BiOBr光催化活性的影响。光催化降解实验结果表明,当Bi:Br=1:2,溶剂热时间为16h,溶剂热温度为140℃时所制备的溴掺杂BiOBr光催化剂的光催化性能较为优异,在可见光照射80min后,光催化效率达到98.4%。3.将条件优化后所自制的自掺杂BiOBr光催化剂用于处理羟丙基胍胶水溶液,实验结果表明,在可见光照射60min后,光催化降解率可达到80%。为探索自掺杂BiOBr光催化剂的光催化机理,分别加入捕获剂苯琨(·O_2-)、叔丁醇(·OH)、硝酸银(e-)、三乙醇胺(h+)捕获光催化降解过程中所产生的活性物质,通过判断加入捕获剂后的抑制率判断光催化过程所起作用的活性物质,确定光催化作用机理。
[Abstract]:The wastewater produced by oil and gas well fracturing has become one of the main oil field wastewater at present. This kind of wastewater has the characteristics of high COD, high turbidity, high viscosity and so on, especially the treatment of polymer in fracturing waste is extremely difficult. Direct discharge without treatment can cause serious pollution to the surrounding environment. As a kind of green economic and environmental protection technology, photocatalytic technology can avoid the disadvantages of high investment and secondary chemical pollution in the treatment of fracturing wastewater, which provides a new way for treating face fracturing wastewater. In order to improve the photocatalytic performance of BiOBr photocatalytic materials and to treat a large number of hydroxypropyl guanidine gum in refractory fracturing wastewater, the self-doping method was used to modify the photocatalytic materials of BiOBr. The specific contents and conclusions of this paper are as follows: 1. The effects of bromine source, reaction solvent, bismuth doping amount, solvothermal time and solvothermal temperature on the photocatalytic activity of bismuth-doped BiOBr were studied. The results of photocatalytic degradation showed that the bismuth doped BiOBr photocatalyst prepared with hexadecyltrimethylammonium bromide as bromine source, ethylene glycol as reaction solvent Bi: Brn 1.2: 1, solvothermal time 16 h and solvothermal temperature 140 鈩，

本文编号：1990372