摘要
Many sub-products of pulsed discharge,such as ultraviolet light,strong electric fields,shock waves and active species,are effective in treating wastewater.To improve the efficiency of the discharge plasma technology in removing pollutants,adding TiO2 photo-catalyst to pulsed discharges could help.A negative-pulsed-discharge system,which has nozzle discharge electrodes with or without TiO2 coating,is used to degrade azo dye Acid Orange Ⅱ,and the effects of several key conditions(maximum pulse voltage,pulse repetition frequency,initial mass concentration of Acid Orange Ⅱ initial solution pH,treatment duration,the phase of discharge,and the existence of TiO2) on the degradation are experimentally investigated.The degradation of Acid Orange Ⅱ increases with maximum pulse voltage,pulse repetition frequency,and treatment duration,and it is larger when putting the discharge electrode on the solution surface than in air or inside the solution,i.e.the discharge in gas phase is more effective than that in gas-liquid phase or liquid phase.The degradation decreases as the initial mass concentration of the solution increases.It also relates to pH and is higher at acidic conditions than at neutral or alkaline conditions.Compared to treatments without TiO2,the ones using the nozzle discharge electrode with TiO2 coated increase the degradation of Acid Orange Ⅱ by 5 %.It is concluded that the proposed system with TiO2 added in can remove Acid Orange Ⅱ from wastewater effectively.
Many sub-products of pulsed discharge, such as ultraviolet light, strong electric fields, shock waves and active species, are effec- tive in treating wastewater. To improve the efficiency of the discharge plasma technology in removing pollutants, adding TiO2 photo-catalyst to pulsed discharges could help. A negative-pulsed-discharge system, which has nozzle discharge electrodes with or without TiO2 coating, is used to degrade azo dye Acid Orange II, and the effects of several key conditions （maximum pulse voltage, pulse repeti- tion frequency, initial mass concentration of Acid Orange Ⅱ initial solution pH, treatment duration, the phase of discharge, and the existence of TiO2） on the degradation are experimentally investigated. The degradation of Acid Orange II increases with maximum pulse voltage, pulse repetition frequency, and treatment duration, and it is larger when putting the discharge electrode on the solution surface than in air or inside the solution, i.e. the discharge in gas phase is more effective than that in gas-liquid phase or liquid phase. The degradation decreases as the initial mass concentration of the solution increases. It also relates to pH and is higher at acidic conditions than at neutral or alkaline conditions. Compared to treatments without TiO2, the ones using the nozzle discharge electrode with TiO： coated increase the de- gradation of Acid Orange Ⅱ by 5 %. It is concluded that the proposed system with TiO2 added in can remove Acid Orange II from wastewater effectively.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2013年第10期2514-2519,共6页
High Voltage Engineering
基金
Project supported by National Natural Science Foundation of China （51207089）, Shang- hai Maritime University （20120097）.
