| 玉米秸秆衍生碳/BiOBr复合材料的制备及其对罗丹明B的光催化降解性能 |
| Corn stalk-derived carbon/BiOBr composite: Synthesis and photocatalytic degradation performance for rhodamine B |
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| 摘要: 以玉米秸秆衍生的碳材料(CS)为载体制备了一种花状BiOBr光催化剂(CS/BiOBr)。采用X射线衍射(XRD)、傅里叶变换红外(FIIR)光谱、扫描电镜(SEM)、X射线光电子能谱(XPS)和紫外可见漫反射光谱(UVVis DRS)对制备的材料进行了表征。SEM分析表明，CS的引入促进了BiOBr独特花状结构的形成，不仅优化了其光捕获效率，还增加了比表面积。与纯BiOBr相比，CS/BiOBr复合材料的带隙更窄。在可见光照射下CS/BiOBr的光催化活性高于CS和BiOBr，其一级反应速率常数(k)为0.043 7min-1，高于BiOBr (0.014 6 min-1)，并展现出优异的稳定性和可重复使用性。光催化活性的增强归因于光诱导电子和空穴的有效分离。超氧自由基和空穴是光催化反应的主要活性物质。 |
| 关键词: 玉米秸秆 农业废弃物 BiOBr 光催化 罗丹明B |
| 基金项目: |
| Abstract: A flowerlike BiOBr photocatalyst (CS/BiOBr) was prepared by using the carbon material derived from corn straw (CS) as the carrier. The prepared composites were characterized by Xray diffraction (XRD), Fourier transform infrared (FIIR) spectra, scanning electron microscope (SEM), Xray photoelectron spectra (XPS), and UVVis diffuse reflectance spectra (UVVis DRS). The SEM analyses indicate that the introduction of CS promotes the formation of a unique flowerlike structure in BiOBr, which not only optimizes the efficiency of light capture but also increases the specific surface area of BiOBr. The bandgap of the composite was narrower compared with the pure BiOBr. The CS/BiOBr composites exhibited higher photocatalytic activity than pure CS and BiOBr under visible light irradiation, and a higher firstorder reaction rate constant (k) of 0.043 7 min-1 than BiOBr (0.014 6 min-1), and exhibited excellent stability and reusability during the cyclic run. The enhanced photocatalytic activity is attributed to the efficient separation of photoinduced electrons and holes. Superoxide radicals and holes were the major active species. |
| Keywords: corn straws agricultural waste BiOBr photocatalysis rhodamine B |
| 投稿时间：2025-01-24 修订日期：2025-05-09 |
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