Gan Huihui, Pan Shuo, Liu Xiuhang, Huang Ying
Civil and Environmental Engineering Department, Ningbo University, Ningbo 315100, China.
Nanomaterials (Basel). 2022 Jun 22;12(13):2138. doi: 10.3390/nano12132138.
A BiTiO/RGO photocatalyst with polyhedron microstructure was fabricated via the template-free hydrothermal method, and the visible-light-induced photocatalytic activity of the prepared BiTiO was also evaluated by the photocatalytic reduction of heavy metal pollutants. The structures and optical properties of the prepared BiTiO/RGO were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and UV-vis diffuse reflectance spectrum (UV-vis DRS). The effects of the reaction time and mineralizer concentration on the formation of the BiTiO polyhedral microstructure were analyzed. The enhanced photocatalytic performances of BiTiO/RGO were observed which were ascribed to the combination of the BiTiO microstructure induced photogenerated charges and the RGO nanostructure as a photogenerated charges carrier. The effect of organic acids, p-hydroxybenzoic acid (PHBA), chloroacetic acid, and citric acid on the Cr(VI) photocatalytic reduction was also discussed. This work provides an insight into the design of the bismuth-based microstructure photocatalyst towards the application for environment purification of heavy metals.
通过无模板水热法制备了具有多面体微观结构的BiTiO/RGO光催化剂，并通过光催化还原重金属污染物来评估所制备的BiTiO的可见光诱导光催化活性。采用X射线衍射（XRD）、扫描电子显微镜（SEM）和紫外-可见漫反射光谱（UV-vis DRS）对所制备的BiTiO/RGO的结构和光学性质进行了表征。分析了反应时间和矿化剂浓度对BiTiO多面体微观结构形成的影响。观察到BiTiO/RGO具有增强的光催化性能，这归因于BiTiO微观结构诱导光生电荷与作为光生电荷载体的RGO纳米结构的结合。还讨论了有机酸、对羟基苯甲酸（PHBA）、氯乙酸和柠檬酸对Cr(VI)光催化还原的影响。这项工作为基于铋的微观结构光催化剂在重金属环境净化应用方面的设计提供了思路。
