γ射线辐照降解水中磺胺甲恶唑的效应及降解机理研究  

Research on Degradation Effect and the Mechanism of Sulfamethoxazole Under Gamma-ray Irradiation in Aqueous Solution

作　　者：王瑾瑾 郭照冰 赵永富[3] 祝胜男[1,2] 沈潇雨 柏杨[1,2] 任杰 WANG Jinjin;GUO Zhaobing;ZHAO Yongfu;ZHU Shengnan;SHEN Xiaoyu;BAI Yang;REN Jie(Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanfing, Jiangsu 210044;School of Environmental Science and Engineering, Nanfing University of Information Science ＆ Technology, Nanjing, Jiangsu 210044;Institute of Facilities and Equipment in Agriculture, Jiangsu Academy of Agricultural Sciences, Nanfing, Jiangsu 210014)

机构地区：[1]江苏省大气环境与装备技术协同创新中心,江苏南京210044 [2]南京信息工程大学环境科学与工程学院,江苏南京210044 [3]江苏省农业科学院农业设施与装备研究所,江苏南京210014

出　　处：《核农学报》2018年第6期1180-1185,共6页Journal of Nuclear Agricultural Sciences

基　　金：国家自然科学基金项目(41373023);江苏省"333高层次人才"培养对象项目;江苏省"青蓝工程"培养对象项目;江苏省研究生培养创新工程项目(SJZZ16_0157)

摘　　要：为了探究γ射线辐照降解含抗生素废水的效应,选取磺胺甲恶唑(SMX)这种难以在废水中分解的磺胺类抗生素,研究不同溶剂对γ射线辐照降解废水中SMX效果的影响,以及羟基自由基(·OH)、水合电子(e_(aq)^-)和氢自由基(H·)在SMX降解过程中的作用及数量关系。结果表明,γ射线辐照可有效降解水中的SMX,低浓度与酸性条件更有利于SMXγ射线辐照降解;γ射线辐照联合1、10和100mmol·L^(-1)H_2O_2均会促进SMX降解;自由基清除剂(叔丁醇和异丙醇)会抑制SMXγ射线辐照降解效果。SMX辐照降解过程中·OH、e_(aq)^-和H·的降解速率常数比例为14.6∶1.0∶3.0,表明SMX降解主要是以·OH氧化的途径完成。当辐照剂量达到6 000 Gy时,100 mg·L^(-1)SMX的降解率达88.88%,而总有机碳(TOC)的降解率仅为15.30%,表明SMX经γ射线辐照降解后矿化效果不佳。本研究结果为γ射线辐照降解含抗生素废水提供了理论依据。In order to explore the degradation effect of antibiotic wastewater under gamma-ray irradiation,sulfamethoxazole（ SMX） which was difficult to dissipate in water,was selected to study its degradation effect during gamma-ray irradiation with different additives,meanwhile,the role and quantitative relationship of hydroxyl radical（ ·OH）,hydrated electron（ eaq^-） and hydrogen（ H·） were determined during in SMX degradation process. The results showed that gamma-ray irradiation could effectively degrade SMX in aqueous solution,low initial concentration and acid condition remarkably improved SMX degradation under gamma-ray irradiation; gamma-ray irradiation with 1,10 and 100 mmol·L^-1 H2O2 solvent could promote SMX degradation. However,the addition of redical scavengers（ 2-propanol and tert-butanol） inhibited SMX radiolytic removal. Besides,the degradation rate constant ratios of ·OH,eaq^-and H· on SMX gamma-ray irradiation degradation process was 14. 6 ∶ 1. 0 ∶ 3. 0,which indicated ·OH radical played the most important role in degrading SMX. It is noted that the degradation of 100 mg·L^-1 SMX was 88. 88% at 6 000 Gy,while TOC removal rate just was 15. 30%,suggesting that gamma-ray irradiation degradation of SMX had a poor mineralization effect. The findings provided a theoretical basis for the degradation of antibiotic wastewater by γ-ray irradiation.

关 键 词：Γ射线 磺胺甲恶唑 辐照降解 自由基 

分 类 号：X703[环境科学与工程—环境工程]