铋银氧化物降解孔雀石绿研究

Degradation of Malachite Green by Bismuth Silver Oxide

采用一步共沉淀法合成氧化性铋银氧化物(BSO),并基于BSO开发了一种简单高效的有机染料降解方法。以孔雀石绿(MG)为目标污染物考察该方法的降解效率,结果表明,通过搅拌混合BSO,35 mg/L的MG溶液快速降解,一级反应速率常数k=0.507 min-1。BSO可以重复使用,连续降解MG溶液至少23次。XRD、SEM、EDX和XPS等表征结果显示BSO在循环使用过程中初始钙钛矿结构逐渐转变为Bi2O2CO3结构。单重态氧是反应主要活性自由基直接导致了MG降解,反应过程受溶解氧影响很小。提出了BSO降解MG的作用机理,为BSO在降解染料废水的应用提供理论依据和实验方法参考。

The oxidative powder bismuth silver oxide（BSO）was prepared by one step coprecipitation method.A simple and efficient approach based on BSO for degrading organic dye was developed and it was evaluated for the oxidation of malachite green（MG）.35 mg/L of MG was rapidly decolorized with a pseudo-first-order kinetic constant 0.507 min-1 by mixing with BSO and the reaction can be repeated at least 23 times with the same BSO particles.Characterizations by XRD,SEM,EDX and XPS indicated that perovskite-like structure was transformed into Bi2O2CO3 structure during the cyclic BSO/MG reaction process.Singlet oxygen was identified as the major reactive species for MG degradation.Dissolved oxygen has little influence on the degradation reaction.The reaction mechanism was proposed.The study would provide theoretical basis and experimental reference for practical application of BSO on dye wastewater treatment.