过硫酸钠/钴离子/超声波协同降解酸性橙7

Degradation of Acid Orange 7 by Na_2S_2O_8/Co^(2+)/ultrasound system

以酸性橙7(AO7)为目标污染物,研究了过硫酸钠(Na_2S_2O_8)/钴离子(Co^(2+))/超声波(US)协同降解水体中AO7的过程及其降解机理,并分别考察了Na_2S_2O_8初始浓度、AO7初始浓度、催化剂投加量和超声波功率对AO7降解率的影响。实验结果表明,过硫酸钠/钴离子/超声波协同工艺能有效的降解水中的酸性橙7。初始AO7浓度越低降解效果越好。超声功率在200~450 W之间时,AO7的降解率随着超声波功率的增大同样先升高后降低。在体系中加入乙醇和叔丁醇后明显抑制AO7的降解,证明该体系中主要氧化物种为硫酸根自由基(SO-4·)和羟基自由基(·OH)。

The degradation process and degradation mechanism were investigated for the removal of Acid Orange 7（ AO7） by a Na_2S_2O_8/Co^2＋/ultrasound（ US） system in aqueous solution. The variables considered for studying the degradation were the initial Na_2S_2O_8 concentration,the initial AO7 concentration,catalyst dosage,and the power of US. Experimental results showed that the Na_2S_2O_8/Co^（2＋）/US system can effectively degrade AO7 in aqueous solution. When the initial AO7 concentration was lower,the removal efficiency of AO7 was higher. For US power in the range from 200 to 450 W,the degradation rate of AO7 increased first and then decreased. The degradation efficiency of AO7 could be lowered with the addition of ethanol and tert-butanol,implying that the main oxide of Na_2S_2O_8/Co^2＋/US system were sulfate radicals（ SO-4·） and hydroxyl radicals（ ·OH）.