| AuCu/ZnAl-LDO复合光催化剂的制备及其光催化性能 | |
| Preparation and Photocatalytic Activity of AuCu/ZnAl-LDO Composite Photocatalysts | |
| 摘要: 采用浸渍还原法成功将金铜纳米颗粒负载到锌铝水滑石表面（AuCu/ZnAl-LDHs），焙烧制得复合金属氧化物（AuCu/ZnAl-LDO）。通过X射线粉末衍射（XRD）、透射电子显微镜（TEM）、X射线光电子能谱（XPS）和紫外-可见漫反射光谱（UV-Vis DRS）技术对材料的晶型、形貌、元素组成以及光吸收性能进行分析。以邻苯二酚为降解物，研究AuCu/ZnAl-LDO在可见光下的光催化性能。实验结果显示：相比于纯锌铝复合金属氧化物（ZnAl-LDO），AuCu/ZnAl-LDO具有更强的可见光吸收能力。Au、Cu负载比例为5：1，焙烧温度为400℃的催化剂在5 h内对邻苯二酚的降解率为94.5%，其降解的反应速率常数为ZnAl-LDO的13.4倍。此外，借助理论计算推测了AuCu/ZnAl-LDO电子转移的路径，并以此提出可能的光催化降解机理。 | |
| 关键词: AuCu/ZnAl-LDO 光催化 电子传递 密度泛函理论 | |
| 基金项目: 国家自然科学基金（No.21503188）资助和浙江省清洁染整技术研究重点实验室开放基金资助（No.QJRZ1901）资助。 | |
| Abstract: Gold and copper nanoparticles were supported on the surface of zinc-aluminum layered double hydroxides (AuCu/ZnAl-LDHs) by method of impregnation-reduction. Mixed metal oxides (AuCu/ZnAl-LDO) were obtained from AuCu/ZnAl-LDHs after calcination. The as-prepared photocatalysts were well characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and UVVis diffuse reflectance spectroscopy (UV-Vis DRS) to investigate the crystal structures, microstructure, elemental composition and visible light absorption capability. The photocatalytic performance of AuCu/ZnAl-LDO was studied by degradation of catechol under visible Light. The results of experimental indicated that AuCu/ZnAl-LDO had stronger visible light absorption capacity than pure zinc-aluminum mixed metal oxides (ZnAl-LDO). The degradation efficiency of catechol reached 94.5% after 5 h irradiation, when loading ratio of AuCu was 5:1 and calcination temperature was 400℃. The photodegradation reaction rate constant was 13.4 times that of ZnAl-LDO. In addition, The path of AuCu/ZnAl-LDO electron transfer was deduced and a possible photocatalytic degradation mechanism was proposed by density functional theory calculation. | |
| Keywords: AuCu/ZnAl-LDO photocatalytic electron transfer density functional theory | |
| 投稿时间：2020-02-23 修订日期：2020-03-22 | |
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| 张冠华,陈语芙,孟跃,张连阳,薛继龙,夏盛杰,倪哲明.AuCu/ZnAl-LDO复合光催化剂的制备及其光催化性能[J].无机化学学报,2020,36(5):875-884. | |
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