[Enhanced decomposition of 1, 4-benzoquinone ring by DSA electrode under ultraviolet irradiation].
Commercial DSA electrode was employed for photoelectrochemical degradation of a model pollutant 1,4-benzoquinone. The effect of electrolyte, electrical field intensity and solution pH conditions were investigated. The results proved that the TOC removal by photoelectrochemical oxidation was 1.25 times that of photocatalytic oxidation and electrocatalytic oxidation alone, indicating a synergetic effect. Addition of electrolyte and application of external electrical field have effectively enhanced the photoelectrochemical oxidation efficiency within a certain range of concentration and intensity. Acidic and neutral pH conditions are favorable for ring opening of 1,4-Benzoquinone.The photoelectrochemical oxidation mechanism is also discussed. It suggests that the efficiency of electrochemically assisted photoelectrochemical oxidation process can be manipulated, accompanied by the generation of hydroxyl radicals, which will be more adaptable for water and wastewater treatment.
Li
Guo-Ting
GT
College of Environmental and Municipal Engineering, North China University of Water Conservancy and Electric Power, Zhengzhou 450011, China. liguoting@ncwu.edu.cn
Wang
Hai-Rong
HR
Li
Dong-Ying
DY
Zhao
Xu
X
Liu
Hui-Juan
HJ
Qu
Jiu-Hui
JH
D016227:Benzoquinones / Q000737:chemistry / Q000302:isolation & purification*; D004563:Electrochemistry / Q000379:methods; D004566:Electrodes; D006863:Hydrogen-Ion Concentration; D010084:Oxidation-Reduction; D010777:Photochemistry / Q000379:methods; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
D016227:Benzoquinones; D014874:Water Pollutants, Chemical; C004532:quinone