紫外活化过硫酸盐降解水中三氯蔗糖动力学和机制  

Kinetics and Mechanism of Sucralose Degradation in Water Using UV-activated Persulfate Process

作　　者：余韵 陆金鑫 吕贞[2] 彭明国 徐彬焜 杜尔登 郑璐 YU Yun;LU Jin-xin;LZhen;PENG Ming-guo;XU Bin-kun;DU Er-deng;ZHENG Lu(School of Environmental&Safety Engineering,Changzhou University,Changzhou 213164,China;Office of Drainage Management,Changzhou 213016,China)

机构地区：[1]常州大学环境与安全工程学院,常州213164 [2]常州市排水管理处,常州213016

出　　处：《环境科学》2020年第10期4626-4635,共10页Environmental Science

基　　金：国家水体污染控制与治理科技重大专项(2017X07202004);常州市科技支撑计划项目(CE20185027);江苏省研究生科研与实践创新计划项目(SJCX19_0639);江苏省国际科技合作项目(BZ2018019);江苏高校中青年教师境外研修项目。

摘　　要：以新兴污染物人工甜味剂三氯蔗糖(SUC)为对象,研究紫外活化过硫酸盐(UV/PS)对其的降解效果.考察UV光强、PS投加量、溶液初始pH值和阴离子浓度等因素的影响,解析UV/PS降解SUC过程中的降解产物并评估其生态毒性.结果表明,对比单一UV和单一PS,UV/PS降解SUC效果更为明显,SUC降解反应速率常数随光强、PS投加量增加而增大,中性条件更有利于SUC降解,背景离子NO3^-和HCO-3对UV/PS降解SUC有一定的抑制作用,而Cl-和SO4^2-促进降解过程.基于高分辨质谱HRMS和GC-MS解析出16种中间产物,降解过程主要涉及羟基化、氧化和醚裂解等反应.发光细菌毒性实验和ECOSAR预测结果表明,UV/PS降解SUC过程中会产生毒性高于母物质的中间产物,对生态环境存在潜在威胁.The degradation of emerging pollutant artificial sweetener sucralose(SUC)using UV/persulfate(UV/PS).The effects of several process parameters,including UV light intensity,PS dosage,pH,and anion concentration,were also investigated.The degradation products and their toxicity during the UV/PS process were further analyzed and evaluated.It is reported that,compared with single UV or PS,the degradation of SUC by UV/PS was more obvious.The degradation rate constants increased with an increase in the light intensity and PS dosage.The SUC degradation could be improved under neutral conditions.The background ions NO3^- and HCO-3 could inhibit the degradation process,while Cl-and SO4^2-ions could accelerate the process.Sixteen intermediate products were identified using high-resolution mass spectrometry(HRMS)and GC-MS.Hydroxylation,oxidation,ether cracking,and other reactions were involved.A degradation path was further proposed.Moreover,luminescent bacteria toxicity test and ECOSAR prediction showed that the intermediates with higher toxicity could be produced during UV/PS,which could pose a potential threat to the ecological environment.

关 键 词：三氯蔗糖(SUC) 人工甜味剂(Ass) 紫外/活化过硫酸盐 动力学 降解机制 

分 类 号：X703.1[环境科学与工程—环境工程]