本文關鍵詞： 雙氯芬酸鈉 動力學 過硫酸鹽 速率常數(shù) 降解路徑　出處：《哈爾濱工業(yè)大學學報》2017年08期 　論文類型：期刊論文

【摘要】：為解決傳統(tǒng)工藝難以有效去除水中有機污染物的問題,采用紫外激活過硫酸鹽工藝去除水中典型PPCPs類物質雙氯芬酸鈉,考察雙氯芬酸鈉初始質量濃度、過硫酸鹽(PS)投加量、溶液pH、陰離子質量濃度和腐殖酸(HA)投加量多種因素對紫外(UV)激活PS去除雙氯芬酸鈉的影響,并分析反應后中間產(chǎn)物可能的降解路徑.結果表明:該工藝降解雙氯芬酸鈉與準一級動力學模型相符(R~2≥0.95),準一級反應速率常數(shù)隨雙氯芬酸鈉初始質量濃度增加而減小,但隨PS投加量的增加雙氯芬酸鈉的降解速率快速增大.不同的pH環(huán)境對雙氯芬酸鈉的降解有一定影響,溶液pH從酸性到堿性的過程中,反應速率常數(shù)的總體趨勢增大.溶液中的陰離子會對系統(tǒng)降解雙氯芬酸鈉產(chǎn)生影響,碳酸氫根離子總體呈促進作用,氯離子呈抑制作用.HA的存在對系統(tǒng)去除雙氯芬酸鈉有較強抑制作用.SO_4~-·可能與雙氯芬酸鈉分子發(fā)生去羧基、去羥基等反應,主要生成N-苯基-2,6-二氯苯胺、1-(2,6-二氯苯基)-2吲哚酮、2-二氫吲哚酮及醛類物質等中間產(chǎn)物.
[Abstract]:In order to solve the problem that the traditional process is difficult to remove organic pollutants effectively in water, the UV activated persulfate process was used to remove diclofenac sodium, a typical PPCPs substance in water, and the initial mass concentration of diclofenac sodium was investigated. The effects of different factors such as the dosage of PS- persulfate, pH of solution, the concentration of anionic ions and the dosage of humic acid (HA) on the removal of diclofenac sodium from PS activated by UV and UV were studied. The results showed that the degradation of diclofenac sodium by this process was consistent with the quasi-first-order kinetic model. The quasi-first-order reaction rate constant decreases with the increase of the initial mass concentration of diclofenac sodium. However, the degradation rate of diclofenac sodium increased rapidly with the increase of PS dosage. The degradation of diclofenac sodium was affected by different pH conditions, and the pH of the solution changed from acidic to alkaline. The general trend of the reaction rate constant is increasing. The anion in the solution will affect the degradation of diclofenac sodium, and the bicarbonate ion will promote the degradation of diclofenac sodium. The presence of chloride ions has a strong inhibitory effect on the removal of diclofenac sodium. So _ 4- 路may have the reaction of decarboxylation and dehydroxyl with diclofenac sodium. The intermediate products such as N- phenyl-2o-6-dichloroaniline-2-dichlorophenyl-2-indolone-2-dihydroindole-one and aldehydes are mainly produced.
【作者單位】： 污染控制與資源化研究國家重點試驗室(同濟大學);
【基金】：國家自然科學基金(51178321,51608372) 國家科技重大專項(2012ZX07403-001,2012ZX07403-002,2008ZX07421-002) 高校博士點基金(20120072110050)
【分類號】：TU991.2
【正文快照】： 藥物與個人護理用品(簡稱PPCPs)廣泛應用于人類和獸類醫(yī)藥、農(nóng)業(yè)及水產(chǎn)養(yǎng)殖業(yè)中.其通過醫(yī)療廢水與生活污水處理廠排放的出水到達生態(tài)環(huán)境,并以垃圾滲濾液、制造過程殘余等方式進入環(huán)境,導致地表水、地下水、飲用水中多次檢測出PPCPs母體化合物及其代謝產(chǎn)物[1].雙氯芬酸鈉是一，

本文編號：1453333