Electrochemical oxidation combined with UV irradiation for synergistic removal of perfluorooctane sulfonate (PFOS) in water

被引：20

作者：

Li, Chenguang ^{[1
,2
,3
]}

Wang, Yifei ^{[2
]}

Wang, Yaye ^{[2
]}

Wang, Zunyao ^{[3
]}

Huang, Qingguo ^{[2
]}

机构：

[1] Ocean Univ China, Coll Environm Sci & Engn, Key Lab Marine Environm & Ecol, Minist Educ, Qingdao 266100, Peoples R China

[2] Univ Georgia, Coll Agr & Environm Sci, Dept Crop & Soil Sci, Griffin, GA 30223 USA

[3] Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resource Reuse, Nanjing 210023, Peoples R China

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2022年 / 436卷

关键词：

PFOS; Electrochemical and UV process; Synergistic effect; Time-dependent density functional theory; Excited state; PERFLUORINATED COMPOUNDS; DESTRUCTION; DEGRADATION; ANODE; TETRACYCLINE; SUBSTANCES; KINETICS;

D O I：

10.1016/j.jhazmat.2022.129091

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The effect of electrochemical degradation on Magneli phase Ti(4)O(7)( )anode combined with UV irradiation on the removal of PFOS was systematically evaluated in the present study. A synergistic effect of electrolysis and UV irradiation rather than a simple additive effect for PFOS degradation was demonstrated experimentally and theoretically. The short wavelength irradiation within 400 nm is the main contribution to enhance the electrochemical degradation of PFOS, while the initial pH of the solution has little effect on the PFOS degradation. The increase of current density accelerates the removal of PFOS either by electrolysis treatment or the joint process. The time-dependent density functional theory (TD-DFT) calculation indicates that the synergistic effect of the electrolysis and UV irradiation is most likely due to the involvement of the excited PFOS induced under UV irradiation in the electrochemical reaction. This study provides the first mechanistic explanation for the electrochemical degradation of PFOS enhanced by UV irradiation.

引用

页数：8

共 49 条

[1] Mechanistic Investigation of Haloacetic Acid Reduction Using Carbon-Ti4O7 Composite Reactive Electrochemical Membranes [J].