Preparation of BiOCl/MgAl-LDH and research on its photocatalytic properties
BiOCl/MgAl-LDH的制备及其光催化性能的研究

摘要

氯氧化铋（BiOCl）作为光催化材料备受关注。但单一单体难以满足实际光催化降解需求，因此将其作为修饰量，修饰镁铝类水滑石并复合，可显著提升光催化性能。本文通过水热法制备出BiOCl和镁铝类水滑石（MgAl-LDH），把MgAl-LDH作为载体，负载BiOCl单体，制得BiOCl/MgAl-LDH复合光催化材料。通过改变BiOCl负载量，得到不同负载率的复合光催化剂，以探究其光催化活性与性能。利用扫描电镜、X射线衍射和紫外-可见漫反射光谱进行表征分析，确定BiOCl成功负载到MgAl-LDH上。以有机染料亚甲基蓝（MB）为降解目标，用氙灯照射180分钟，结果显示负载率25%的BiOCl/MgAl-LDH复合光催化材料光催化效果最佳，降解率达99.1%。对该材料进行可重复性实验，探究其稳定性，发现它具有优异的稳定性。最后通过淬灭实验证明，h+是参与反应的主要活性物种。

Abstract

Bismuth Chloride (BiOCl) has attracted much attention as a photocatalytic material. However, it is difficult for a single monomer to meet the actual needs of photocatalytic degradation, so it can be used as a modified quantity to modify MgAl-layered double hydroxide (MgAl-LDH) and composite it, which can significantly improve the photocatalytic performance.This paper prepares BiOCl and MgAl-layered double hydroxide (MgAl-LDH) by hydrothermal method, and uses MgAl-LDH as a carrier to load BiOCl monomer to prepare BiOCl/MgAl-LDH composite photocatalytic materials. By changing the BiOCl load, a composite photocatalyst with different load rates is obtained to explore its photocatalytic activity and performance. Using scanning electron microscopy, X-ray diffraction and ultraviolet-visible diffuse reflection spectrum for characterisation analysis, it was determined that BiOCl was successfully loaded on MgAl-LDH.Taking the organic dye methylene blue (MB) as the degradation target, it was irradiated with a xenon lamp for 180 minutes. The results showed that the photocatalytic effect of BiOCl/MgAl-LDH composite photocatalytic material with a load rate of 25% was the best, with a degradation rate of 99.1%. Conduct repeatability experiments on the material, explore its stability, and find that it has excellent stability. Finally, the quenching experiment proved that h + is the main active species involved in the reaction.