一步水热法合成Mn3O4/CuMnO2及其光芬顿反应性能的研究

Synthesis of Mn3O4/CuMnO2 by One⁃Step Hydrothermal Method and Its Photo⁃Fenton Reaction Performance

李哲 王芳芳 陈常东

Zhe LI Fangfang WANG Changdong CHEN

辽宁石油化工大学 石油化工学院，辽宁 抚顺 113001

School of Petrochemical Engineering，Liaoning Petrochemical University，Fushun Liaoning 113001，China

以二水合氯化铜、四水合氯化锰为原料，通过一步水热法制备了Mn3O4/CuMnO2异质结构催化剂CMO?A（A为水热合成温度）；通过X射线粉末衍射仪对不同合成温度下制备的样品进行了组成分析；以汞灯为光源，50 mg/L罗丹明B(RhB)溶液作为污染物模型，对所制备CMO?A样品的光芬顿反应性能进行了测试；向反应体系中加入牺牲剂，结合对照实验探究了反应机理。结果表明，在反应温度为150 ℃时合成的样品CMO?150对RhB溶液的降解效果最好，降解时间为15 min时降解率可达98.01%；0.2 mol/L H2O2、50 mg CMO?150催化剂、50 mg/L RhB溶液、pH=3.0为最佳反应条件；经过5次循环后，降解时间为15 min时降解率仅下降22.24%；反应的主要活性物种为羟基自由基(·OH)；结合对照实验，对反应机理进行了探究。

Heterogeneous Mn3O4/CuMnO2 catalyst CMO?A is prepared by a one?step hydrothermal method using cupric chloride dihydrate and manganese chloride tetrahydrate as raw materials.The composition of the samples prepared at different temperatures is analyzed by X?ray diffraction analysis.Using mercury lamp as light source and 50 mg/L Rhodamine B(RhB) solution as contaminant model,the photo?Fenton reaction performance of the prepared CMO?A sample is tested.The results show that CMO?150 has the best degradation effect on RhB solution when the reaction temperature is 150 ℃,and the degradation rate reaches 98.01% when the reaction time is 15 min.The optimal reaction conditions and cyclic stability of CMO?150 catalyst are investigated.The experimental results show that the optimal reaction conditions are 0.2 mol/L H2O2,50 mg CMO?150 catalyst,50 mg/L RhB solution and pH=3.0.After 5 cycles,the degradation rate only decreases by 22.24% at 15 min.The main active species in the reaction is hydroxyl radical (·OH) through the sacrificial agent experiment,and the reaction mechanism is explored by combining with the control experiment.

教育部“春晖计划”合作科研项目(2020703?8);国家留学基金委公派访学学者面上项目(CSC202008210025);辽宁省教育厅项目(LJKMZ20220736)

10.12422/j.issn.1006-396X.2024.03.010