Chang Qiang-Qiang, Cui Yi-Wei, Zhang Hai-Huan, Chang Fei, Zhu Bao-Hua, Yu Shi-Yong
Inner Mongolia Key Laboratory of Chemistry and Physics of Rare Earth Materials, School of Chemistry and Chemical Engineering, Inner Mongolia University Hohhot 010021 Inner Mongolia China
RSC Adv. 2019 Apr 26;9(22):12689-12695. doi: 10.1039/c8ra09985e. eCollection 2019 Apr 17.
Recently, engineering metal-organic frameworks (MOFs) into metal oxides by solid state thermal decomposition has attracted wide attention for photocatalytic applications. Here, a series of C-doped ZnO materials decorated with Au nanoparticles (Au/C-ZnO) were constructed controlled pyrolysis of ZIF-8 adsorbing different amounts of HAuCl·4HO. In this pyrolysis process, ZIF-8 was transformed into C-doped ZnO according to the EDX and XPS analysis. Meanwhile, HAuCl·4HO was transformed into Au nanoparticles that were uniformly dispersed on the surface of C-ZnO as seen in TEM images. The photocatalytic activity of as-prepared catalysts was evaluated by the degradation of methyl orange under UV-vis light irradiation. It was found that the photocatalytic activity of Au/C-ZnO was better than C-ZnO and pure ZnO. Furthermore, Au/C-ZnO exhibited high photocatalytic stability. After three consecutive cycles, there was no noticeable deactivation in the reaction. This unusual photocatalytic activity was attributed to the synergistic effect of C-doping and Au NPs.
最近，通过固态热分解将工程金属有机框架（MOF）转化为金属氧化物在光催化应用中引起了广泛关注。在此，通过对吸附不同量HAuCl₄·4H₂O的ZIF-8进行控制热解，构建了一系列用金纳米颗粒修饰的碳掺杂氧化锌材料（Au/C-ZnO）。在该热解过程中，根据能谱仪（EDX）和X射线光电子能谱（XPS）分析，ZIF-8转化为碳掺杂的氧化锌。同时，如透射电子显微镜（TEM）图像所示，HAuCl₄·4H₂O转化为均匀分散在碳掺杂氧化锌表面的金纳米颗粒。通过在紫外-可见光照射下甲基橙的降解来评估所制备催化剂的光催化活性。发现Au/C-ZnO的光催化活性优于碳掺杂氧化锌和纯氧化锌。此外，Au/C-ZnO表现出高光催化稳定性。连续三个循环后，反应中没有明显的失活现象。这种异常的光催化活性归因于碳掺杂和金纳米颗粒的协同效应。
