电晕放电等离子体降解酸性嫩黄2G及其机理探究*

本文运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的去除率的影响。实验结果显示,电晕放电等离子体可有效降解酸性嫩黄2G溶液。在放电功率90W、频率5kHZ、初始浓度20mg?L_-1、电极间距5mm、空气流速1.6L?min_-1条件下反应30min,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的降解过程中也有N=N的断裂,以及苯环上的Cl原子被取代等反应。

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

Corona discharge plasma was used to degrade the acid brilliant yellow 2G in water, and its effect on the removal rate of acid yellow 2G at different conditions was discussed. The results of the experiments show that the corona discharge plasma has effectively degrade the acid yellow 2G solution. The removal rate of acid yellow 2G can reach 94.23% with the reaction time for 30min, under the conditions of discharge power to be 70W, frequency 5kHZ, initial concentration 20mg?L-1, electrode spacing 5mm, air velocity 1.6L?min-1. The degradation reaction follows the first order reaction kinetics. The intermediate products of acid yellow 2G waste water are 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., indicating that the degradation process of acidic yellow 2G is also found and the reaction of the Cl atoms on the benzene ring was replaced by the breakage of N=N.