TY - JOUR
T1 - Treatment of azo dye (Acid Orange II) wastewater by pulsed high-voltage hybrid gas-liquid discharge
AU - Zhou, Zhiyong
AU - Zhang, Xiaying
AU - Liu, Ying
AU - Ma, Yuepeng
AU - Lu, Shuaijun
AU - Zhang, Wei
AU - Ren, Zhongqi
N1 - Publisher Copyright:
© The Royal Society of Chemistry 2015.
PY - 2015/8/20
Y1 - 2015/8/20
N2 - Pulsed high-voltage electrical discharge was used in treating azo dye (Acid Orange ii, AO7) wastewater. The effects of initial pH, Fe2+ concentration, discharge mode, conductivity of initial aqueous solution and the type of bubbling gas (air, O2, N2) on AO7 degradation were studied. A new gas-liquid discharge (NGL) mode, by which a plate was exposed to air and needles were immersed in liquid, displayed a remarkably better AO7 degradation than the gas-liquid discharge (GL) mode and the liquid discharge (L) mode. The lower conductivity of aqueous solution and the higher oxygen concentration in bubbled gas were of benefit to the degradation process. In addition, owing to the multi-point structure and self-provided Fe2+, the electrode with iron mesh-plate discharge showed a more competitive degradation performance than that with multi-needle-plate discharge. The oxidant of OH and H2O2 induced by the discharge process were also studied to explore the degradation processes. By NGL mode with iron mesh electrode and bubbled air in reactor, the degradation efficiency of AO7 was up to 85.8% when the initial pH, conductivity and Fe2+ concentration were 2.28, 200 μS·cm-1 and 1.635 mmol L-1, respectively.
AB - Pulsed high-voltage electrical discharge was used in treating azo dye (Acid Orange ii, AO7) wastewater. The effects of initial pH, Fe2+ concentration, discharge mode, conductivity of initial aqueous solution and the type of bubbling gas (air, O2, N2) on AO7 degradation were studied. A new gas-liquid discharge (NGL) mode, by which a plate was exposed to air and needles were immersed in liquid, displayed a remarkably better AO7 degradation than the gas-liquid discharge (GL) mode and the liquid discharge (L) mode. The lower conductivity of aqueous solution and the higher oxygen concentration in bubbled gas were of benefit to the degradation process. In addition, owing to the multi-point structure and self-provided Fe2+, the electrode with iron mesh-plate discharge showed a more competitive degradation performance than that with multi-needle-plate discharge. The oxidant of OH and H2O2 induced by the discharge process were also studied to explore the degradation processes. By NGL mode with iron mesh electrode and bubbled air in reactor, the degradation efficiency of AO7 was up to 85.8% when the initial pH, conductivity and Fe2+ concentration were 2.28, 200 μS·cm-1 and 1.635 mmol L-1, respectively.
UR - https://www.scopus.com/pages/publications/84940530888
U2 - 10.1039/c5ra11864f
DO - 10.1039/c5ra11864f
M3 - 文章
AN - SCOPUS:84940530888
SN - 2046-2069
VL - 5
SP - 71973
EP - 71979
JO - RSC Advances
JF - RSC Advances
IS - 88
ER -