BiOBr/BiVO4复合物的制备及其光催化性能研究
Preparation of BiOBr/BiVO4 composite with enhanced photocatalytic performance
采用原位沉淀法成功制备BiOBr/BiVO4复合光催化剂,对其晶体结构、微观形貌、吸光性能、能带结构等进行表征分析。BiOBr和BiVO4之间形成的良好异质结界面和匹配的能带结构,有效促进光生电子-空穴对的分离与迁移。在可见光照射下,BiOBr/BiVO4复合物对盐酸四环素(TCH)表现出显著增强的光催化降解性能,其中BiOBr/BiVO4-2样品光催化活性最优,光照40 min后,TCH的降解率达到80.0%,其一级动力学拟合的反应速率常数达到0.035 0 min-1,是单一BiVO4的2.01倍。自由基捕获实验进一步表明,·OH和光生空穴(h+)在BiOBr/BiVO4复合物光催化降解TCH过程中起主要作用。
BiOBr/BiVO4 composite photocatalysts were successfully synthesized via an in situ precipitation method and systematically characterized in terms of its crystal structure,morphology,light absorption properties,and band structure.The results indicate that well-defined heterojunction interface with matched band alignment was formed between BiOBr and BiVO4,which effectively facilitated the separation and migration of photogenerated electron-hole pairs.Under visible-light irradiation,the BiOBr/BiVO4 composite exhibited significantly enhanced photocatalytic performance for the degradation of tetracycline hydrochloride (TCH).Among the samples,BiOBr/BiVO4-2 displayed the highest photocatalytic activity with TCH degradation rate of 80.0% within 40 min and the pseudo-first-order kinetic rate constant was calculated to be 0.035 0 min-1,which is 2.01 times higher than that of pure BiVO4.Free radical trapping experiments further revealed that ·OH and photogenerated holes (h+) played major roles in the photocatalytic degradation process.
photocatalysis / tetracycline hydrochloride / BiOBr / BiVO4
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河南省科技攻关项目(242102110189)
河南省高等学校重点科研项目(25B150020)
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