氨基修饰增强的Fe/Cu-MOF对罗丹明B的光催化降解性能及相关机理

利用溶剂热合成法合成了氨基修饰的Fe/Cu-MOF-NH₂，分别采用XRD、SEM、N₂吸附-脱附、UV-vis、EA等检测方法进行了表征分析，并将其用于RhB的光催化降解，考察了RhB的初始质量浓度、催化剂质量浓度和pH对光催化降解的影响。结果表明，氨基的引入显著提升了催化剂的可见光响应性能；在合成Fe/Cu-MOF-NH₂时，当含氨基配体与不含氨基配体的摩尔比为1∶1、RhB初始质量浓度为300 mg·L⁻¹、催化剂质量浓度为1 mg·mL⁻¹、pH为4.2时，光照4 h后，催化剂对RhB的去除率达到99.53%。活性物种淬灭实验结果表明，·OH、h⁺分别是Fe/Cu-MOF-NH₂和Fe/Cu-MOF在催化降解过程中的主要活性物种。以上结果可为探究Fe/Cu-MOF-NH₂光催化降解RhB的机制提供参考。

Performance and mechanism of amino modification enhanced photocatalytic degradation of Rhodamine B by Fe/Cu-MOF

An amino-modified Fe/Cu-MOF-NH2 was synthesized by solvothermal method for photocatalytic degradation of RhB. And this composite was characterized by XRD, SEM, N2 adsorption-desorption, UV-vis and EA. The effects of RhB initial concentration, catalyst concentration and pH on the photocatalytic degradation of RhB were investigated. The result showed that the visible light response of the catalyst increased greatly after amino modification. When the molar ratio of the amino ligand to the non-amino ligand was 1∶1 during Fe/Cu-MOF-NH2 synthesis, the removal rate of RhB reached 99.53% for 300 mg·L−1 RhB after 4 hours of irradiation at Fe/Cu-MOF-NH2 dosage of 1 mg·mL−1 and pH=4.2. The quenching experiments of active species showed that ·OH and h+ were the main active species in the catalytic degradation of Fe/Cu-MOF-NH2 and Fe/Cu-MOF, respectively. The above results can provide a reference for exploring the mechanism of photocatalytic degradation of RhB by Fe/Cu-MOF-NH2.