發(fā)布時間：2018-06-07 07:34

  本文選題：BiOBr + 自摻雜��； 參考：《西南石油大學(xué)》2017年碩士論文

【摘要】：油氣井壓裂作業(yè)后產(chǎn)生的廢水已成為當(dāng)前主要的油田廢水之一,此類廢水具有高COD、高濁度、高粘度難處理等特點,特別是壓裂廢中聚合物的處理極其棘手,若不經(jīng)處理直接外排會對周圍的環(huán)境造成嚴(yán)重的污染。光催化技術(shù)作為一種綠色經(jīng)濟環(huán)保技術(shù),將其應(yīng)用于處理壓裂廢水可避免傳統(tǒng)處理方法所具備的高投資、二次化學(xué)污染等缺點,為處理當(dāng)面壓裂廢水的提供一種新思路。本文采用自摻雜方式對BiOBr光催化材料進(jìn)行改性研究,以提高BiOBr光催化材料光催化性能,并用于處理難降解的壓裂廢水中大量存在的羥丙基胍膠。本文的具體研究內(nèi)容和結(jié)論如下:1.以五水硝酸鉍(Bi(NO_3)_(3.)5H)2O)為實驗的鉍源,研究溴源、反應(yīng)溶劑、鉍摻雜量、溶劑熱時間、溶劑熱溫度對鉍摻雜BiOBr光催化活性的影響。光催化降解實驗結(jié)果表明,當(dāng)以十六烷基三甲基溴化銨(CTAB)為溴源,乙二醇為反應(yīng)溶劑,Bi:Br=1.2:1,溶劑熱時間為16h,溶劑熱溫度為140℃時所制備的鉍摻雜BiOBr光催化劑的光催化性能較為優(yōu)異,且在可見光照射80min后,光催化效率達(dá)到99.4%。2.采用溶劑熱方法制備溴摻雜BiOBr光催化材料,研究溴摻雜量、溶劑熱時間、溶劑熱溫度對溴摻雜BiOBr光催化活性的影響。光催化降解實驗結(jié)果表明,當(dāng)Bi:Br=1:2,溶劑熱時間為16h,溶劑熱溫度為140℃時所制備的溴摻雜BiOBr光催化劑的光催化性能較為優(yōu)異,在可見光照射80min后,光催化效率達(dá)到98.4%。3.將條件優(yōu)化后所自制的自摻雜BiOBr光催化劑用于處理羥丙基胍膠水溶液,實驗結(jié)果表明,在可見光照射60min后,光催化降解率可達(dá)到80%。為探索自摻雜BiOBr光催化劑的光催化機理,分別加入捕獲劑苯琨(·O_2-)、叔丁醇(·OH)、硝酸銀(e-)、三乙醇胺(h+)捕獲光催化降解過程中所產(chǎn)生的活性物質(zhì),通過判斷加入捕獲劑后的抑制率判斷光催化過程所起作用的活性物質(zhì),確定光催化作用機理。
[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，

本文編號：1990372