作者:米世新， 牟红旭， 王剑浩， 杨陆娟， 吴鹏伟， 刘子薇， 庄艳丽

Authors:MI Shixin, MU Hongxu, WANG Jianhao, YANG Lujuan, WU Pengwei, LIU Ziwei, ZHUANG Yanli摘要: 针对提高单体 BiOI 的可见光催化降解效率的问题,采用煅烧法在不同温度下制备出了 CeO2 三维花型结构,然后将 CeO2 加入到 BiOI 前驱体溶液中,通过溶剂热法制备出不同复合比例的 BiOI/ CeO2 复合光催化剂。运用X 射线粉末衍射 ( XRD) 、扫描电子显微镜 ( SEM) 、紫外 - 可见漫反射光谱 ( UV-Vis DRS) 、电化学等对制备样品进行表征,利用对罗丹明 B ( RhB) 的降解实验评价了不同 CeO2 煅烧温度、不同复合比例对光催化降解效率的影响,并通过自由基捕获实验对复合材料的光催化机理进行了分析。 结果表明,当 BiOI 与 CeO2 ( 煅烧温度为 400℃ ) 的质量比为 1∶ 1 时,复合材料对 RhB 的降解率最佳,约为 38. 1% 。 相比于 BiOI ( 约为 24% ) 和 CeO2 ( 约为23% ) 其降解率有了一定的提高。 这可能归因于两种材料复合后在界面处形成的异质结结构有效地抑制了光生电子 - 空穴的复合速率,实现了光催化性能的提高。

Abstract:\n\t In order to improve the visible light catalytic degradation efficiency of monomer BiOI, the three-dimensional floral structure of CeO2 was prepared by calcination at different temperatures. Then, CeO2 was added to BiOI precursor solution and BiOI/ CeO2 composite photocatalysts with different composite ratios were prepared by solvothermal method. X-ray powder diffraction ( XRD), scanning electron microscope ( SEM), ultraviolet-visible diffuse reflectance spectroscopy ( UV-Vis DRS) and electrochemistry were used to characterize the prepared samples, and the effects of CeO2 calcination temperatures and different mass ratios on the photocatalytic degradation efficiency were evaluated by the degradation experiments of rhodamine B ( RhB) .\n
\n\n\tThe photocatalytic mechanism of the composites was analyzed by radical trapping experiments. The results showed that when the mass ratio of BiOI to CeO2 (400℃ ) was 1∶ 1, the degradation rate of RhB was the best, which was about 38. 1%. Compared with BiOI ( about 24% ) and CeO2 ( about 23% ), the degradation rate was improved. This may be attributed to the heterojunction structure formed at the interface after the composite of the two materials, which effectively inhibits the photoelectron-hole recombination rate and improves the photocatalytic performance.\n


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