以五水硝酸铋、碳纳米管(CNTs)和蒙脱石(MMT)为原料,采用水热法制备溴氧化铋(BiOBr)、BiOBr/CNTs和BiOBr/MMT复合材料,通过X射线衍射仪、扫描电子显微镜和比表面积及孔隙度分析仪等对复合材料的结构、形貌和孔径分布进行分析表征。以BiOBr基复合材料作为催化剂进行光催化降解亚甲基蓝实验,研究了复合材料的催化性能及其降解机理。结果表明:BiOBr为典型四方晶相结构,CNTs和MMT负载到BiOBr表面且样品结晶度好;复合材料呈薄片裹成的中空球形结构;氮气吸附-脱附等温线显示BiOBr/CNTs的吸附能力明显提高。可见光激发以及弱碱性条件下,BiOBr/CNTs与BiOBr/MMT复合材料的催化降解性能较BiOBr得到提升,BiOBr/CNTs对亚甲基蓝的催化降解性能最好;降解溶液pH分别为8.0、9.0和9.0时,BiOBr/CNTs、BiOBr/MMT和BiOBr对亚甲基蓝的降解率最佳,分别为98.6%、86.8%和82.2%;随着亚甲基蓝初始质量浓度的逐步提升,BiBr/CNTs和BiOBr/MMT复合材料降解能力表现出明显下降趋势,说明BiOBr基复合材料适合降解低浓度亚甲基蓝。循环使用3次后,BiOBr/CNTs对亚甲基蓝仍具有较好的催化降解性能。
Bismuth oxybromide (BiOBr),BiOBr/CNTs,and BiOBr/MMT composite materials were prepared by hydrothermal method using Bi(NO2)3·5H2O,carbon nanotubes (CNTs),and montmorillonite (MMT) as raw materials.The structure,morphology,and pore distribution of the composite materials were analyzed and characterized by X-ray diffractometer,scanning electron microscope,and specific surface area and porosity analyzer methods.The BiOBr-based composites were used as photocatalysts in the degradation of methylene blue under visible light to investigate their catalytic performance and degradation mechanism.The results showed that BiOBr-based composite materials had a typical tetragonal crystal structure,CNTs and MMT were successfully loaded onto the surface of BiOBr,and the samples exhibited good crystallinity.BiOBr composite materials presented hollow spherical structures wrapped in thin sheets.The adsorption-desorption curve indicated a significant improvement in the adsorption capacity of BiOBr/CNTs.Under visible light excitation and weak alkaline conditions,the catalytic degradation performance of BiOBr/CNTs and BiOBr/MMT composite materials was improved compared to BiOBr,and BiOBr/CNTs possessed the best catalytic degradation performance for methylene blue.When the pH value of the solution was 8.0,9.0 and 9.0,the highest catalytic degradation rates of methylene blue by BiOBr/CNTs,BiOBr/MMT,and BiOBr were 98.6%,86.8%,and 82.2%,respectively.However,with the initial concentration of methylene blue gradually increased,the degradation abilities of the BiOBr/CNTs and BiOBr/MMT materials were decreased,indicating BiOBr-based composite catalysts were suitable for the degradation of low concentration methylene blue solution.After three cycles of use,BiOBr/CNTs still exhibited good catalytic degradation performance for methylene blue.
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基金资助
国家自然科学基金(52166008);大学生创新创业训练计划项目(202310664006)
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