电晕放电等离子体降解酸性嫩黄2G及其机理探究

Degradation of acid brilliant yellow 2G by corona discharge plasma and related mechanisms

用电晕放电等离子体来降解染料废水中的酸性嫩黄2G,探讨了不同条件对酸性嫩黄2G去除率的影响。实验结果显示:电晕放电等离子体可有效降解酸性嫩黄2G;在放电功率90 W、频率5 kHz、初始质量浓度20 mg/L、电极间距5 mm、空气流速1.6 L/min的条件下反应30 min,酸性嫩黄2G的去除率可达到98.46%;降解反应遵循一级反应动力学。酸性嫩黄2G废水经放电处理后的中间产物主要为甲酸、乙酸、哌嗪、乳酸、R-3-氨基哌啶、对硝基苯酚、对甲基苯甲酸、2,3-氨基-1-丁烯、1-羟基-2-氨基丙烯、2-氨基丁烷、丙二酸、顺丁烯二酸等,这表明酸性嫩黄2G的降解过程中有N=N的断裂,以及苯环上的Cl原子被取代等反应。

Corona discharge plasma was used to degrade the acid brilliant yellow 2G in dyeing waste water, and its effect on the removal rate of acid yellow 2G at different conditions was discussed. The results of the experiments showed that the corona discharge plasma had effectively degrade the acid yellow 2G solution. The removal rate of acid yellow 2G could reach 98.46% with the reaction time for 30 min, under the conditions of discharge power to be 90 W, frequency 5 kHz, initial concentration 20 mg/L, electrode spacing 5 mm, air velocity 1.6 L/min. The degradation reaction followed the first order reaction kinetics. The intermediate products of acid yellow 2G waste water were mainly formic acid, acetic acid, piperazine, lactic acid, R-3-aminodroperidine, p-nitrophenol, p-methylbenzoic acid, 2,3-amino-1-butene, 1-hydroxyl-2-amino-propylene, 2-aminobutane, malonic acid, maleic acid, etc. This indicated that N=N was broken during the degradation of acid yellow 2G, and the Cl atom on the benzene ring was substituted.