摘要
尝试将超声氧化与单质锌还原耦合来降解对硝基苯胺,考察了初始pH、锌投加量及超声功率对去除率的影响。实验结果表明,超声与锌耦合处理对硝基苯胺的最佳条件为:溶液初始pH为7,锌投加量为0.6 g/L,超声功率为40 W,超声时间30 min,对硝基苯胺去除率高达94.2%,比单独超声和单独锌作用时分别提高了85.9%和47.2%。超声-单质锌耦合降解对硝基苯胺的过程符合拟一级动力学模型,且超声与单质锌表现出了明显的协同作用,协同因子为4.06。理论分析显示,超声/单质锌体系主要是依靠羟基自由基氧化和单质锌还原之间的耦合来达到降解对硝基苯胺的目的。
Combination of the oxidation of ultrasound and the reduction of zero zinc is used to degrade p-nitroaniline.The factors affecting the reaction,such as initial pH,the dosage of zero zinc and ultrasound power are studied.The results shows that the best condition is: initial pH of 7,the dosage of zero zinc of 0.6 g/L,ultrasound power of 40 W,ultrasound time of 30 min,the degradation of p-nitroaniline reaches 94% in the system of ultrasound combined with zero zinc,which is respectively improved by 85.93% and 47.18%,compared to ultrasound alone and zero zinc alone.The reaction follows a pseudo-first order model.Ultrasound and zero zinc have synergistic effect in the process,and the cofactor is 4.06.Analysis indicates that in the ultrasound/zero zinc system p-nitroaniline is degraded primarily by the oxidation of hydroxyl radicals and the reduction of zero zinc.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2013年第S1期163-166,共4页
Environmental Science & Technology
基金
深圳市科技研发资金(JSF201006300042A)
关键词
超声
单质锌
协同
对硝基苯胺
ultrasound
zinc
synergism
p-nitroaniline
