【摘要】 通过简单水热法制备新型铋金属（Bi）与还原氧化石墨烯（r GO）共修饰SnO₂三元光催化剂,并采用多种手段对其进行表征。以亚甲基蓝（MB）和四环素（TCH）为目标污染物,考察三元材料对污染物的光催化降解性能。结果表明,在可见光条件下,复合光催化材料对四环素去除率为94. 1%（60 min）,对亚甲基蓝去除率为75. 5%（120 min）,降解效果显著好于纯SnO₂与二元催化剂Bi-SnO₂。光致发光光谱（PL）、瞬态光电流响应和电化学阻抗谱（EIS）结果表明,复合材料中电子转移及分离效率的提升显著提高了自由基的产生及光催化效率。阐述了铋金属、还原氧化石墨烯和二氧化锡中间的协同效应,并基于自由基掩蔽试验和电子自旋共振谱（ESR）提出了光催化机制。更多还原

【Abstract】 The given paper intends to make an investigation of the SPR effect of bismuth and that of the reduced graphene oxide on the photocatalysis. For the research purpose,we have worked out and prepared a novel ternary photocatalyst via the simple hydrothermal procedure of the bismuth and the reduced graphene oxide co-doped SnO₂. Furthermore,we have also done a series of photocatalytic degradation experiments under the visible light to find the effects of bismuth and the reduced graphene oxide on the photocatalysis. The as-prepared nanocomposites have demonstrated the superior visible light photocatalytic activity for the tetracycline hydrochloride（ short for TCH） degradation with a removal efficiency of 94. 1% for 60 min and methylene blue degradation with 75. 5% removal for 120 min. The paper has also examined and presented the impact of the bismuth proportion and the reduced graphene oxide on the degradation of methylene blue and tetracycline by comparing the removal efficiency under the photocatalysts with the different amounts of bismuth and the reduced graphene oxide. The likely reasons may account for the experiment results and the relevant references,which help to improve the photocatalytic activity to some extent. Nevertheless,excessive contents of bismuth and reduced graphene oxide turn to be disadvantageous to the use of light and transfer of charge/electron.The pollutants removal efficiencies in terms of G_{0. 15}Bi₂₀SnO₂ also prove to be much higher than those of SnO₂,G_{0. 15}SnO₂ and Bi₂₀SnO₂. The excellent behavior of G_{0. 15}Bi₂₀SnO₂ should be ascribed to the enhancement of the electronic transfer and separation.Besides,the synergistic effect among the bismuth,the reduced graphene oxide and SnO₂ and the mechanism the paper has proposed in detail should be behaving based on the degradation pathway analysis,whereas the quenching experiment has been also proven of great significance with the electron spin resonance（ short for ESR） spectra. The results of the above said study have thus demonstrated that the prepared plasmonic photocatalyst doped with bismuth and reduced graphene oxide has been verified to be a promising one for degrading pollutants. In addition,it has also presented the degradation pathway of the methylene blue and tetracycline through mass spectrometer. Thus,this paper proves to be successful in proposing reasons accounting for the apparent difference on degradation of the antibiotic elements and dye.更多还原