摘要
研究了次甲基蓝(Methylene Blue,MB)初始质量浓度、H_2O_2浓度、草酸高铁铵浓度和初始p H值等对其降解率的影响。以叔丁醇捕获体系产生的·OH,并采用GC-MS鉴定其光降解部分产物,探讨了其可能的降解途径。结果表明,随着MB初始质量浓度的增加,降解率减小;UV/H_2O_2/草酸高铁铵体系在弱酸性和中性条件下对MB的降解作用最佳,降解率最高可达97.85%。MB降解过程符合Langmuir一级反应动力学,GC-MS检测到的中间产物有苯乙酮、苯胺、异氰酸苯酯、苯并噻唑、甲苯等,主要降解途径为MB分子被·OH攻击,导致C—C、C—N、C—S等键发生断裂或被·OH氧化。
The influences of initial concentration of Methylene Blue （MB）, dosages of H2O2 and ammonium ferric oxalate and initial pH values on degradation rate of MB are investigated. As radical scavenger, tert-butylalcohol is used to capture the · OH radical. The degradation pathways are discussed after some intermediates are identified by GC-MS. The results show that, with the increase of initial concentration of MB, degradation rate of MB decreases. Compared with UV/H2O2 system, UV/ferrioxalate system and UV/H2O2/ferrioxalate system, UV/H2O2/ferrioxalate system shows the highest degradation rate of MB is 97.85%. Moreover, MB degradation process is consistent with Langmuir first order reaction kinetics. As intermediate products, acetophenone, benzenamine, iso-cyanobenzene, benzothiazole and methyl ben- zene are determined by GC-MS. The main pathway is that .OH attacks the MB and leads to cleavage of C-C,C-N,C S bonds or -OH oxidation process.
出处
《印染》
北大核心
2016年第14期1-6,共6页
China Dyeing and Finishing
基金
国家自然科学基金项目(21167012)
2015年内蒙古自治区科技计划项目
关键词
印染废水
染料
次甲基蓝
光降解
草酸高铁铵
dyeing and finishing wastewater
dyestuff
Methylene Blue
photodegradation
ammonium ferrioxalate
