BiOBr/CdS异质结构材料的制备及其光催化还原Cr⁶⁺的研究

Preparation of BiOBr/CdS Heterostructured Materials and Their Study on Photocatalytic Reduction of Cr⁶⁺

摘要: 全球经济的蓬勃发展给人类社会带来了物质方面的极大满足，与此同时也导致了环境污染和能源短缺等问题的出现。目前来说，光催化技术是一种环境友好型处理环境污染的方式，BiOBr材料具有独特的层状结构及合适的带隙，这使得其具有独特的光催化性能。本实验以乙二醇为溶剂，以五水硝酸铋和十六烷基三甲基溴化铵为原料，通过溶剂热法合成了花形BiOBr，并以其为基底，通过一锅水浴法制得了BiOBr/CdS复合催化剂。为了评价其降解废水污染物(本实验以重铬酸钾作为模拟污染物)的作用，将BiOBr及BiOBr/CdS作为模型光催化剂，通过XRD、SEM、DRS、PL、EIS等一系列表征对其进行了深入的研究。光催化实验结果显示：在可见光的环境下，复合光催化剂BiOBr/CdS在进行光催化反应21 min后，对Cr(VI)的还原效率高达96.42%，远高于单一BiOBr催化剂的还原效率，是单一BiOBr催化剂的1.38倍。

Abstract: The vigorous development of the global economy has brought great material satisfaction to human society, but at the same time, it has also led to the emergence of problems such as environmental pollution and energy shortage. At present, photo-catalytic technology is an environmentally friendly way to deal with environmental pollution, and BiOBr materials have unique layered structures and suitable band gaps, which make them have unique photocatalytic properties. In this experiment, ethylene glycol was used as solvent, bismuth nitrate pentahydrate and cetyltrimethylammonium bromide were used as raw materials, and flower-shaped BiOBr was synthesized by solvothermal method, and the BiOBr/CdS composite catalyst was prepared by a pot of water bath with ethylene glycol as the solvent. In order to evaluate its role in degrading wastewater pollutants (potassium dichromate was used as a simulated pollutant in this experiment), BiOBr and BiOBr/CdS were used as model photocatalysts, and a series of characterization such as XRD, SEM, DRS, PL, and EIS were studied. The results of photocatalytic experiments showed that the reduction efficiency of Cr(VI) of the composite photocatalyst BiOBr/CdS in the visible light environment was as high as 96.42% after 21 min of photocatalytic reaction, which was much higher than that of a single BiOBr catalyst and 1.38 times that of a single BiOBr catalyst.