Activation of persulfate by UV and Fe2+ for the defluorination of perfluorooctanoic acid

被引:11
作者
Song, Zhou [1 ,2 ,3 ]
Tang, Heqing [1 ,2 ]
Wang, Nan [3 ]
Wang, Xiaobo [3 ]
Zhu, Lihua [3 ]
机构
[1] South Cent Univ Nationalities, Coll Chem & Mat Sci, Key Lab Catalysis & Mat Sci, State Ethn Affairs Commiss, 182 Minyuan Rd, Wuhan, Hubei, Peoples R China
[2] South Cent Univ Nationalities, Coll Chem & Mat Sci, Minist Educ, Wuhan, Hubei, Peoples R China
[3] Huazhong Univ Sci & Technol, Coll Chem & Chem Engn, Wuhan, Hubei, Peoples R China
来源
ADVANCES IN ENVIRONMENTAL RESEARCH-AN INTERNATIONAL JOURNAL | 2014年 / 3卷 / 03期
基金
国家高技术研究发展计划(863计划);
关键词
perfluorooctanoic acid; synergism; persulfate; UV; ferrous ions;
D O I
10.12989/aer.2014.3.3.185
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Efficient defluorination of perfluorooctanoic acid (PFOA) was achieved by integrating UV irradiation and Fe2+ activation of persulfate (S2O82-). It was found that the UV-Fe2+, Fe2+-S2O82-, and UV-S2O82-processes caused defluorination efficiency of 6.4%, 1.6% and 23.2% for PFOA at pH 5.0 within 5 h, respectively, but a combined system of UV-Fe2+-S(2)O(8)(2-)dramatically promoted the defluorination efficiency up to 63.3%. The beneficial synergistic behavior between Fe2+-S(2)O(8)(2-)and UV-S2O82-was demonstrated to be dependent on Fe2+ dosage, initial S(2)O(8)(2-)concentration, and solution pH. The decomposition of PFOA resulted in generation of shorter-chain perfluorinated carboxylic acids (PFCAs), formic acid and fluoride ions. The generated PFCAs intermediates could be further defluorinated by adding supplementary Fe2+ and, S(2)O(8)(2-)and re-adjusting solution pH in later reaction stage. The much enhanced PFOA defluorination in the UV-Fe2+-S(2)O(8)(2-)system was attributed to the fact that the simultaneous employment of UV light and Fe2+ not only greatly enhanced the activation of S(2)O(8)(2-)to form strong oxidizing sulfate radicals (SO4(center dot-)), but also provided an additional decarboxylation pathway caused by electron transfer from PFOA to in situ generated Fe3+.
引用
收藏
页码:185 / 197
页数:13
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