紫外活化过硫酸钠去除水体中的三氯卡班

发布时间：2018-09-06 11:47

【摘要】：采用紫外活化过硫酸钠(UV/PS)降解三氯卡班(TCC).考察了UV、PS和UV/PS联用工艺去除TCC的效果,研究了PS投加量、反应初始p H值和腐殖酸(HA)等因素对UV/PS降解TCC的影响,推测了UV/PS工艺中TCC可能的降解途径,并对比了UV/PS和UV/H2O2工艺对TCC的去除效果和经济性.研究表明:UV与PS联用能够高效去除TCC,其降解过程符合拟一级动力学模型(R~2≥0.95);拟一级反应速率常数k随着PS投加量的增加先增大再减小,在PS投加量为250μmol/L时,k达到最大值0.0810min~(-1);偏酸性条件(p H=6.0)有利于TCC的降解;HA对TCC的降解有抑制作用,抑制作用与HA的浓度呈正相关;GC/MS鉴定表明,TCC降解过程中主要的中间产物有异氰酸4-氯苯酯和对氯苯胺,其可能的降解途径为TCC分子结构中与酮羰基相连的C-N键断裂,脱氯,经过一系列的反应形成对氯苯胺和异氰酸4-氯苯酯;UV/PS降解TCC过程中溶液中脱氯反应导致Cl~-浓度增加;与UV/H_2O_2工艺相比,相同条件下UV/PS工艺中k值增大了96.65%,单位电能消耗量提高了97%.
[Abstract]:Trichlorocarban (TCC) was degraded by ultraviolet activated sodium persulfate (UV/PS). The removal efficiency of TCC by UV, PS and UV/PS combined processes was investigated. The effects of PS dosage, initial P H value and humic acid (HA) on the degradation of TCC by UV/PS were studied. The possible degradation pathways of TCC in UV/PS process were speculated. The removal of TCC by UV/PS and UV/H2O2 processes were compared. The results showed that UV combined with PS could effectively remove TCC, and the degradation process accorded with pseudo-first-order kinetic model (R~2>0.95); the pseudo-first-order reaction rate constant K increased first and then decreased with the increase of PS dosage, and reached the maximum value of 0.0810 min~(-1) when PS dosage was 250 micromol/L; the partial acidity condition (p H=6.0) was favorable for TCC. The results of GC/MS analysis showed that the main intermediates in TCC degradation were isocyanate 4-chlorophenyl ester and p-chloroaniline, and the possible degradation pathway was C-N bond cleavage, dechlorination, and formation of pairs after a series of reactions. Chloraniline and isocyanate 4-chlorophenyl ester; chlorine removal in solution during UV/PS degradation of TCC resulted in an increase of Cl~ - concentration; compared with UV/H_2O_2 process, the K value of UV/PS process increased by 96.65%, and the unit power consumption increased by 97%.
【作者单位】：苏州科技大学环境科学与工程学院;厦门理工学院水资源环境研究所;浙江工业大学建筑工程学院;同济大学污染控制与资源化研究国家重点实验室;
【基金】：国家自然科学基金项目(51378446,51678527,51408518) 福建省科技计划引导性项目(2017Y0079) 福建省高校新世纪优秀人才支持计划项目(JA14227) 福建省自然科学基金项目(2016J01695) 江苏省企业研究生工作站合作项目厦门市科技局项目(3502Z20131157,3502Z20150051)
【分类号】：X52

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