合成具有增强可见光光催化性能的新型 CeO2-BiVO4/FAC 复合材料。
Synthesis of novel CeO2-BiVO4/FAC composites with enhanced visible-light photocatalytic properties.
机构信息
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China.; School of Biochemical and Environmental Engineering, Nanjing Xiaozhuang University, Nanjing 211171, China.
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China.
出版信息
J Environ Sci (China). 2014 Sep 1;26(9):1936-42. doi: 10.1016/j.jes.2014.07.006. Epub 2014 Jul 16.
To utilize visible light more effectively in photocatalytic reactions, a fly ash cenosphere (FAC)-supported CeO2-BiVO4 (CeO2-BiVO4/FAC) composite photocatalyst was prepared by modified metalorganic decomposition and impregnation methods. The physical and photophysical properties of the composite have been characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), and UV-Visible diffuse reflectance spectra. The XRD patterns exhibited characteristic diffraction peaks of both BiVO4 and CeO2 crystalline phases. The XPS results showed that Ce was present as both Ce(4+) and Ce(3+) oxidation states in CeO2 and dispersed on the surface of BiVO4 to constitute a p-n heterojunction composite. The absorption threshold of the CeO2-BiVO4/FAC composite shifted to a longer wavelength in the UV-Vis absorption spectrum compared to the pure CeO2 and pure BiVO4. The composites exhibited enhanced photocatalytic activity for Methylene Blue (MB) degradation under visible light irradiation. It was found that the 7.5wt.% CeO2-BiVO4/FAC composite showed the highest photocatalytic activity for MB dye wastewater treatment.
为了在光催化反应中更有效地利用可见光，通过改进的金属有机分解和浸渍法制备了粉煤灰空心微珠（FAC）负载的 CeO2-BiVO4（CeO2-BiVO4/FAC）复合光催化剂。采用 X 射线衍射（XRD）、扫描电子显微镜（SEM）和能谱（EDX）、X 射线光电子能谱（XPS）和紫外-可见漫反射光谱对复合材料的物理和光物理性质进行了表征。XRD 图谱显示了 BiVO4 和 CeO2 晶相的特征衍射峰。XPS 结果表明，Ce 在 CeO2 中以 Ce（4+）和 Ce（3+）两种氧化态存在，并分散在 BiVO4 表面上，构成 p-n 异质结复合材料。与纯 CeO2 和纯 BiVO4 相比，CeO2-BiVO4/FAC 复合材料的紫外-可见吸收光谱的吸收阈值向长波长移动。结果表明，CeO2-BiVO4/FAC 复合材料在可见光照射下对亚甲基蓝（MB）的降解具有增强的光催化活性。发现 7.5wt.% CeO2-BiVO4/FAC 复合材料对 MB 染料废水处理具有最高的光催化活性。
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