摘要
通过测定在可见光照射下过氧化氢降解罗丹明B的UV-vis吸收光谱变化,探讨了可见光照的条件下过氧化氢对罗丹明B的降解情况及影响因素.实验表明:过氧化氢在碱性条件下可以有效地氧化罗丹明B,可见光能有效加快该降解过程.在pH=12的条件下,光照100min后罗丹明B(10μmol/L)降解率达到95%以上.并通过初始速率法确定了反应符合零级反应动力学.pH值对罗丹明B的氧化降解有很大的影响,当pH<9值时罗丹明B难以被氧化降解.羟基自由基和单态氧都不是该过程的活性氧化物种.
In this work,the degradation of rhodamine B(RhB) by hydrogen peroxide under visible light irradiation is studied by detecting UV-vis spectral changes of RhB solution.The results indicated that visible light induction can efficiently improve the oxidative degradation of RhB by hydrogen peroxide in alkaline solution,especially more than 95% conversion of RhB(10μmol/L) at pH = 12 after irradiated for 100min.Zero-order kinetics was confirmed by initial concentration method.The pH effect was studied that the deg...
出处
《中南民族大学学报（自然科学版）》
CAS
2007年第1期13-15,共3页
Journal of South-Central University for Nationalities：Natural Science Edition
基金
国家自然科学基金资助项目(20577070)
国家民委自然科学基金重点资助项目(MZZ04003)
关键词
可见光
过氧化氢
罗丹明B
氧化降解
visible light
hydrogen peroxide
rhodamine B
oxidative degradation
