一步法制备Bi2MoO6/CoMoO4绣花球结构及其光催化性能

以五水硝酸铋为铋源,采用简易的一步水热法合成出Bi_2MoO_6/CoMoO_4绣花球结构。通过X射线粉末衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、傅里叶红外光谱(FT-IR)、紫外-可见漫反射光谱(UV-Vis DRS)、荧光光谱(PL)和电化学测试等表征对所制备催化剂的物相组成、微观形貌、光学性质以及光生电荷复合效率进行了分析。研究结果表明,引入Bi_2MoO_6之后,Bi_2MoO_6/CoMoO_4复合异质结的光吸收范围明显被拓宽,其光生电荷的分离率也得到了提升。以亚甲基蓝和头孢曲松钠为污染物来模拟废水,在可见光的条件下评估催化剂样品的光催化降解活性。在可见光下光照60 min后,Bi_2MoO_6负载量为30%(w/w)的复合物具有最佳的光催化性能,其降解速率常数约为纯CoMoO_4的2倍。基于实验的所有表征,进一步地研究了Bi_2MoO_6/CoMoO_4体系相应的光催化机理。

One-Step Preparation and Photocatalytic Activity of Bi2MoO6/CoMoO4 Embroidery Ball Structure

Herein, Bi₂MoO₆/CoMoO₄ embroidery ball structures were synthesized by a simple one-step hydrothermal method that using bismuth nitrate pentahydrate as the bismuth source. By X-ray powder diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), Fourier infrared spectroscopy (FT-IR), ultraviolet-visible diffuse reflection spectroscopy (UV-Vis DRS), fluorescence spectrum (PL), and electrochemical tests were performed to analyze the phase composition, micromorphology, optical properties, and recombination rate of photogenerated charge of the prepared catalyst. The results showed that when introducing Bi₂MoO₆, the light absorption range of the Bi₂MoO₆/CoMoO₄ heterojunctions were significantly enhanced, and the separation of photogenerated charges were also improved. Methylene blue and ceftriaxone sodium were used as pollutants to simulate wastewater, and the photocatalytic degradation activity of the catalyst samples was evaluated under visible light. After irradiation for 60 min, the composite with Bi₂MoO₆ loading of 30%(w/w) composites has the best photocatalytic performance, and the degradation rate constant was twice that of pure CoMoO₄. Based on all the experimental characterizations, the corresponding photocatalytic mechanism of the Bi₂MoO₆/CoMoO₄ system was further studied.