PVP辅助合成Bi/BiOBr复合材料固氮性能研究
Study on the Nitrogen Fixation Performance of Bi/BiOBr Composite Synthesized via PVP-Assisted Method
DOI: 10.12677/ms.2026.162044, PDF,    科研立项经费支持
作者: 胡梦琪, 丁 妍, 王世豪, 许书帆, 马晓天, 孙海杰*：郑州师范学院化学化工学院，河南 郑州
关键词: 聚乙烯吡咯烷酮；溴氧化铋；光催化；固氮；PVP； Bismuth Oxybromide； Photocatalysis； Nitrogen Fixation
摘要: 以五水合硝酸铋(Bi(NO3)3·5H2O)和溴化钾(KBr)为原料，采用溶剂热法成功制备了溴氧化铋(BiOBr)。在合成过程中引入表面活性剂聚乙烯吡咯烷酮(PVP)，系统考察了PVP添加量及溶剂热反应温度对材料光催化固氮性能的影响。进一步以硼氢化钠(NaBH4)为还原剂，将部分BiOBr还原为金属铋(Bi)，构建了Bi/BiOBr复合催化剂，并评价了其固氮性能。利用X射线衍射(XRD)、紫外–可见漫反射光谱(UV-Vis-DRS)、荧光光谱以及紫外–可见分光光度计等表征手段，分析了样品的晶体结构、光学性质及光生载流子行为。结果表明，PVP的引入有效缩小了BiOBr的禁带宽度，增强了光吸收能力，从而提升了光催化活性。当溶剂热温度为160℃、PVP添加量为0.4 g时，所制备的BiOBr/0.4样品表现出最优的固氮性能。在BiOBr与NaBH4物质的量比为2:0.6的条件下，制得的Bi/BiOBr复合材料具有最佳的固氮效果。反应进行至150 min时，其固氮速率达到7.93 μg∙g−1∙min−1。本研究为调控BiOBr基材料能带结构与表面特性提供了可行策略，对开发高效光催化固氮材料具有参考意义。
Abstract: Bismuth oxybromide (BiOBr) was successfully synthesized via a solvothermal method using bismuth nitrate pentahydrate (Bi(NO3)3∙5H2O) and potassium bromide (KBr) as starting materials. The surfactant polyvinylpyrrolidone (PVP) was introduced to assist the solvothermal synthesis, and the effects of PVP dosage and solvothermal temperature on the nitrogen fixation performance of BiOBr were systematically investigated. Furthermore, a Bi/BiOBr composite was prepared by reducing part of the BiOBr to metallic bismuth (Bi) using sodium borohydride (NaBH4) as a reducing agent, and its nitrogen fixation performance was evaluated. The as-prepared samples were characterized by X-ray diffraction (XRD), ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis-DRS), photoluminescence spectroscopy, and UV-Vis spectrophotometry to analyze their phase structure, light absorption properties, and photogenerated carrier behavior. The results indicated that the introduction of PVP effectively narrowed the band gap of BiOBr and enhanced its light absorption capacity, thereby improving the photocatalytic activity. The BiOBr/0.4 sample, prepared at a solvothermal temperature of 160˚C with a PVP addition of 0.4 g, exhibited the optimal photocatalytic nitrogen fixation performance. The Bi/BiOBr composite obtained at a BiOBr to NaBH4 molar ratio of 2:0.6 showed the best nitrogen fixation activity. After 150 minutes of reaction, the nitrogen fixation rate reached 7.93 μg∙g−1∙min−1. This study provides a feasible strategy for regulating the band structure and surface properties of BiOBr-based materials, offering valuable insights for the development of efficient photocatalytic nitrogen fixation materials.
文章引用：胡梦琪, 丁妍, 王世豪, 许书帆, 马晓天, 孙海杰. PVP辅助合成Bi/BiOBr复合材料固氮性能研究[J]. 材料科学, 2026, 16(2): 252-264. https://doi.org/10.12677/ms.2026.162044

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