为了有效地改善和处理环境污染问题,光催化技术因其具有二次污染小、耗能低、制作成本低廉和绿色环保等优点备受研究人员的关注。卤氧化铋催化剂因其独特的能带结构及在可见光下表现出良好的光催化性能,在诸多催化剂材料中脱颖而出。采用溶剂热法合成产物BiOCl0.25Br0.75,通过扫描电子显微镜(SEM)和X射线衍射仪(XRD)对所得产物的形貌和结构进行表征。所制球形BiOCl0.25Br0.75的直径约为1.25μm,且分散性良好;在可见光照射下,以甲基橙为降解目标,探讨了反应时间、催化剂质量、甲基橙溶液的初始浓度、溶液pH等因素对催化剂BiOCl0.25Br0.75的催化性能的影响。结果表明:在可见光下,BiOCl0.25Br0.75光催化剂用量为0.1g,降解100mL 50mg/L甲基橙溶液,降解时间为150min时,其降解效果优异;且BiOCl0.25Br0.75在可见光下催化降解甲基橙与一级动力学过程一致。
To effectively improve and deal with the problem of environmental pollution,photocatalytic technology has the characteristics of small secondary pollution,low energy consumption,low production cost and green environmental protection,and has attracted lots of attentions from researchers.Bismuth halogen oxide,owing to its unique band structure and excellent photocatalytic performance under visible light,stand out among many catalyst materials.The product BiOCl0.25Br0.75 was synthesized by solvothermal method.The morphology and structure of as-synthesized BiOCl0.25Br0.75 were characterized by SEM and XRD,respectively.The morphologies of BiOCl0.25Br0.75 were microspheres with the diameter of 1.25μm and good dispersion.Under visible light irradiation,with methyl orange (MO) as the degradation target,the influence of reaction time,photocatalyst quality,initial concentration of MO solution,and solution pH on the catalytic properties of BiOCl0.25Br0.75 was investigated.The results showed that,under visible light,the degradation effect of MO solution was excellent when the dosage of BiOCl0.25Br0.75 photocatalyst was 0.1g and 100mL of 50mg/L.MO solution was degraded for 150min.Besides,the catalytic degradation of MO by BiOCl0.25Br0.75 under visible light was consistent with the first-order kinetic process.
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基金资助
玉林师范学院高层次人才启动项目(G2019ZK22)
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