【作者】 郭贺； 王慧娟； 杨文明； 李洋； 依成武；

【Author】 GUO He;WANG Huijuan;YANG Wenming;LI Yang;YI Chengwu;School of the Environment and Safety Engineering, Jiangsu University;School of Material Science and Engineering, Jiangsu University;

【机构】 江苏大学环境与安全工程学院； 江苏大学材料科学与工程学院；

【摘要】 为了提高脉冲放电等离子体（pulsed discharge plasma,PDP）对染料废水的降解效果,以酸性橙Ⅱ（acid orange,AO7）作为目标污染物,建立多针-板电极形式的PDP与活性炭（activated carbon,AC）相联合的循环脱色体系。考察PDP/AC协同体系中,AC的添加、AC粒径、电极间距、溶液pH、载气种类、载气量等关键参数对AO7降解效果的影响,同时考察相同操作参数条件下,以去离子水为介质放电60min后,PDP/AC协同体系中过氧化氢（hydrogen peroxide,H₂O₂）的生成浓度,以说明各参数变化对系统活性物种浓度的影响。研究结果表明:PDP/AC联合体系降解AO7废水的效果优于单独PDP体系;粒径为1-2mm的AC添加更有利于AO7降解,降解效率可以提高20.4%,但此时AC损耗较大;同时,PDP/AC联合体系所产生H₂O₂量高于单独PDP体系H₂O₂生成量,且粒径为1-2 mm的AC添加体系中可以产生更多的H₂O₂;1.5 cm较0.8 cm的电极间距不利于系统中AO7的降解和H₂O₂的生成;酸性溶液条件下AO7降解率较高且相应产生的H₂O₂浓度较高;载氧气流速为2L/min时,AO7降解效果最佳,降解率可达到81.5%,该条件下水溶液中H₂O₂的生成量可达0.5316mmol·L^-1。更多还原

【Abstract】 In order to improve the degradation efficiency of dye wastewater by pulsed discharge plasma（PDP）,a cyclic synergistic decoloration system of PDP with a multi-needle-to-plate geometry electrode combined with activated carbon（AC） was established in this paper.Acid Orange 7（AO7） was chosen as the typical pollutant,the influences of many critical parameters in the system,including particle size of AC,electrode distance,solution pH,varieties and bubbling rate of gas,on degradation efficiency of AO7 were investigated.The formation of hydrogen peroxide（H₂O₂）in deionized water after 60 min discharge under the same reaction condition was also reviewed to illustrate the effect of different parameters on active species formation in the synergistic system.The obtained results show that degradation of AO7 in the combined system of PDP and AC was better than that in the sole PDP system;the AC with 1-2 mm particle size was more favorable for AO7 degradation than that of the AC with 2-3 mm size,but the carbon loss was higher in the case of 1-2 mm AC addition;the production of H₂O₂ in the PDP/AC system was higher than that in the sole PDP system,and the production of H₂O₂ in the synergistic system with l-2mm AC addition was also higher than that in the system with 2-3 mm AC addition;compared to 15 mm electrode distance,the degradation of AO7 was higher under the condition of 8 mm electrode distance and the generated H₂O₂ concentration was higher;the acidic solution was benefit for AO7 degradation and H₂O₂ formation in the synergistic system;under the condition of 2 L/min oxygen bubbling rate,the degradation of AO7 in the synergistic system achieved was 81.5%and H₂O₂ concentration was 0.5316 mmol·L^-1.更多还原