一步法制备Bi2MoO6/CoMoO4绣花球结构及其光催化性能

One-Step Preparation and Photocatalytic Activity of BiMoO/CoMoO Embroidery Ball Structure

以五水硝酸铋为铋源,采用简易的一步水热法合成出Bi2MoO6/CoMoO4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Bi2MoO6之后,Bi2MoO6/CoMoO4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,Bi2MoO6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CoMoO4的2倍。基于实验的所有表征,进一步地研究了Bi2MoO6/CoMoO4体系相应的光催化机理。

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),ultravi-olet-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 absorp-tion range of the Bi2MoO6/CoMoO4 heterojunctions were significantly enhanced,and the separation of photogenerat-ed charges were also improved.Methylene blue and ceftriaxone sodium were used as pollutants to simulate wastewa-ter,and the photocatalytic degradation activity of the catalyst samples was evaluated under visible light.After irradi-ation for 60 min,the composite with Bi2MoO6 loading of 30%(w/w)composites has the best photocatalytic perfor-mance,and the degradation rate constant was twice that of pure CoMoO4.Based on all the experimental characteriza-tions,the corresponding photocatalytic mechanism of the Bi2MoO6/CoMoO4 system was further studied.