紫外激活过硫酸盐降解水中双氯芬酸钠

发布时间：2018-01-22 02:24

  本文关键词： 双氯芬酸钠 动力学 过硫酸盐 速率常数 降解路径　出处：《哈尔滨工业大学学报》2017年08期 　论文类型：期刊论文

【摘要】：为解决传统工艺难以有效去除水中有机污染物的问题,采用紫外激活过硫酸盐工艺去除水中典型PPCPs类物质双氯芬酸钠,考察双氯芬酸钠初始质量浓度、过硫酸盐(PS)投加量、溶液pH、阴离子质量浓度和腐殖酸(HA)投加量多种因素对紫外(UV)激活PS去除双氯芬酸钠的影响,并分析反应后中间产物可能的降解路径.结果表明:该工艺降解双氯芬酸钠与准一级动力学模型相符(R~2≥0.95),准一级反应速率常数随双氯芬酸钠初始质量浓度增加而减小,但随PS投加量的增加双氯芬酸钠的降解速率快速增大.不同的pH环境对双氯芬酸钠的降解有一定影响,溶液pH从酸性到碱性的过程中,反应速率常数的总体趋势增大.溶液中的阴离子会对系统降解双氯芬酸钠产生影响,碳酸氢根离子总体呈促进作用,氯离子呈抑制作用.HA的存在对系统去除双氯芬酸钠有较强抑制作用.SO_4~-·可能与双氯芬酸钠分子发生去羧基、去羟基等反应,主要生成N-苯基-2,6-二氯苯胺、1-(2,6-二氯苯基)-2吲哚酮、2-二氢吲哚酮及醛类物质等中间产物.
[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.
【作者单位】： 污染控制与资源化研究国家重点试验室(同济大学);
【基金】：国家自然科学基金(51178321,51608372) 国家科技重大专项(2012ZX07403-001,2012ZX07403-002,2008ZX07421-002) 高校博士点基金(20120072110050)
【分类号】：TU991.2
【正文快照】： 药物与个人护理用品(简称PPCPs)广泛应用于人类和兽类医药、农业及水产养殖业中.其通过医疗废水与生活污水处理厂排放的出水到达生态环境,并以垃圾渗滤液、制造过程残余等方式进入环境,导致地表水、地下水、饮用水中多次检测出PPCPs母体化合物及其代谢产物[1].双氯芬酸钠是一，

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