Sonocatalytic degradation of RhB over LuFeO3 particles under ultrasonic irradiation.
Sonocatalytic degradation of RhB over LuFeO3 particles under ultrasonic irradiation.
复制标题
DOI：
10.1016/j.jhazmat.2015.02.054
复制
发表时间：
2015-05
影响因子：
13.6
通讯作者：
M. Zhou;H. Yang;T. Xian;Ruishan Li;Huining Zhang;Xiangxian Wang
中科院分区：
文献类型：
--
作者：
M. Zhou;H. Yang;T. Xian;Ruishan Li;Huining Zhang;Xiangxian Wang
采用聚丙烯酰胺凝胶法合成了平均粒径约为200 nm的LuFeO3纳米粒子。以罗丹明B（RhB）为目标化合物，研究了LuFeO 3的声催化活性，结果表明，LuFeO 3具有良好的声催化活性。考察了超声频率（f）、反应温度（T）、催化剂用量（Ccatalytic）、RhB初始浓度（CRhB）和pH值等因素对超声催化效率的影响。结果表明，前4个因素对超声催化降解RhB有重要影响，最佳降解条件为：f = 60 kHz，T= 40 °C，C催化剂= 4 g L−1，CRhB = 5 mg L−1。与其他实验因素相比，pH值对RhB的声催化降解影响相对较小。羟基（自由基dotOH）自由基的荧光检测使用对苯二甲酸作为探针分子，揭示了它们产生的超声波辐照的LuFeO3颗粒。乙醇的加入导致猝灭的自由基dotOH自由基和同时减少的RhB降解。这表明自由基dotOH自由基是导致染料降解的主要活性物质。
LuFeO3particles with an average particle size of ∼200 nm were synthesized via a polyacrylamide gel route. The sonocatalytic activity of LuFeO3particles was evaluated by the degradation of Rhodamine B (RhB) under ultrasonic irradiation, revealing that they exhibit a good sonocatalytic activity. The effects of various experimental factors including ultrasonic frequency (f), reaction solution temperature (T), catalyst dosage (Ccatalyst), initial RhB concentration (CRhB), and pH value on the sonocatalysis efficiency were investigated. It is found that the former four factors have an important influence on the sonocatalytic degradation of RhB, where the best degradation conditions are obtained to bef= 60 kHz,T= 40 °C,Ccatalyst= 4 g L−1, andCRhB= 5 mg L−1. The pH value has a relatively small effect on the sonocatalytic degradation of RhB compared with other experimental factors. Hydroxyl (radical dotOH) radicals were detected by fluorimetry using terephthalic acid as a probe molecule, revealing that they are produced over the ultrasonic-irradiated LuFeO3particles. The addition of ethanol leads to a quenching of radical dotOH radicals and a simultaneous decrease in the RhB degradation. This indicates that radical dotOH radicals are the primary active species responsible for the dye degradation.