摘要
以雌酮(E1)、17β-雌二醇(E2)和17α-乙炔基雌二醇(EE2)模拟水中微量类固醇雌激素复合污染体系,考察UV(/H2O2/TiO2)工艺对共存微污染的控制效果及影响因素。结果表明,3种物质降解过程均符合一级反应动力学,但降解效果不同,雌酮易于降解,在单纯UV体系中反应30 min,去除率可达93.9%,且在混合基质中呈优势降解趋势,单纯UV工艺中,雌酮降解速率常数为0.065 min-1,远高于17β-雌二醇(0.006 min-1)和17α-乙炔基雌二醇(0.006 min-1);投加H2O2和TiO2可显著提高3种目标物的反应速率常数和降解效果,雌酮降解速率常数可分别提高至0.098和0.111min-1。以UV/H2O2系统为典型工艺,考察了底物初始浓度、pH值和阴阳离子等因素对复合污染体系中雌酮、17β-雌二醇和17α-乙炔基雌二醇共降解的影响,结果表明,多种环境因素均未改变雌酮在混合基质中高效去除的优势;底物初始浓度的增加会降低去除效果,减缓降解速率常数;降低pH有利于降解速率和去除率的提高;阳离子对去除效果及降解速率的影响不大;水中常见阴离子会抑制雌酮的降解速率,抑制强弱顺序为HCO3->SO42->CO32->NO3-,对17β-雌二醇和17α-乙炔基雌二醇的影响不明显。
Three co-existing steroid estrogens of estrone（ E1）,17β- estradiol（ E2） and 17α- ethinyl estradiol（ EE2） were selected to simulate combined polluted aqueous system and UV（ / H2O2/ TiO2） was used to control coexisted micropollutants simultaneously. Results showed that degradation of each contaminant fitted first-order kinetic model,while different removal efficiencies of the three aimed compounds indicated competition degradation existed in mixed matrix. E1 could be effectively degraded even in single UV process with removal ratio of 93. 9%after 30 min contact and took advantages in competition with reaction velocity constant of 0. 065 min- 1,E2 and EE2 had the similar and comparably lower degradation rate constant of 0. 006 min- 1. Compared with single UV,the addition of H2O2and TiO2could promote the removal efficiency and reaction rate constant apparently. Taken UV/ H2O2as typical investigated process,the influences of initial concentration,pH value,existence of cations and anions were evaluated for co-removal of steroid estrogens which showed no alternation on E1＇s superior degradation. Higher initial concentration led to lower removal efficiency and reaction rate constant,low pH value could enhance degradation effect and reaction rate constant,cations had little influence on degradation and presence of anions had negative effect on degradation of E1,inhibition sequence was HCO3- SO42- CO32- NO3-,while for E2 and EE2,little influence was concluded.
出处
《四川大学学报（工程科学版）》
EI
CAS
CSCD
北大核心
2013年第5期177-184,共8页
Journal of Sichuan University (Engineering Science Edition)
基金
国家自然科学基金资助项目(51208468
51008261
51208469)
浙江省自然科学基金(Q12E080063)
浙江工业大学校校基金重点项目(1101106040408)
浙江省教育厅科研资助项目(Y201119321)
