摘要
采用水热法与原位煅烧法制备BiOCl/BiSbO_(4)/g-C_(3)N_(4)复合材料,并以罗丹明B为目标污染物,系统研究其在可见光条件下的光催化降解性能。同时,通过傅里叶变换红外光谱和紫外-可见漫反射光谱对复合材料结构及光学性质进行表征。结果表明,该复合材料的光吸收阈值约为470 nm,对应禁带宽度为2.6 eV,比单一BiOCl、BiSbO_(4)、g-C_(3)N_(4)禁带宽度窄,具有良好的可见光响应能力。在可见光照射条件下,投加15 mg BiOCl/BiSbO_(4)/g-C_(3)N_(4)(BiSbO_(4)质量分数为7%)光催化剂,可将200 mL、初始质量浓度为20 mg/L的罗丹明B溶液在60 min内的降解率提升至97.15%;当溶液pH值为2时,罗丹明B在30 min内的降解率可达99.67%。研究结果表明,BiOCl/BiSbO_(4)/g-C_(3)N_(4)复合材料在酸性至近中性条件下表现出优异的可见光催化活性,在染料废水治理领域具有良好的应用潜力,经过4次循环后降解率仍有73.4%。
The BiOCl/BiSbO_(4)/g-C_(3)N_(4) composite material is prepared by the hydrothermal method and insitu calcination.Rhodamine B is used as the target pollutant to systematically study its photocatalytic degradation performance under visible light conditions.Meanwhile,the structure and optical properties of the composite material are characterized by Fourier transform infrared spectroscopy and ultraviolet-visible diffuse reflectance spectroscopy.The results show that the light absorption threshold of the composite material is approximately 470 nm,corresponding to a band gap width of 2.6 eV,which is narrower than that of the single BiOCl,BiSbO_(4),and g-C_(3)N_(4) materials,and it has good visible light response ability.Under visible light irradiation,when 15 mg BiOCl/BiSbO_(4)/g-C_(3)N_(4)(BiSbO_(4) with 7%mass fraction)photocatalyst is added to 200 mL of Rhodamine B solution with an initial mass concentration of 20 mg/L,the degradation rate could be increased to 97.15%within 60 min.When the solution pH is 2,the degradation rate of Rhodamine B could reach 99.67%within 30 min.The research results show that the BiOCl/BiSbO_(4)/g-C_(3)N_(4) composite material exhibits excellent visible light catalytic activity in acidic to near-neutral conditions and has good application potential in the field of dye wastewater treatment.Moreover,the degradation rate remained at 73.4%after four cycles.
作者
杨芬
王加婷
张永伍
YANG Fen;WANG Jiating;ZHANG Yongwu(College of Chemistry and Material Engineering,Qujing Normal University,Qujing 655000,China;Qujing No.1 Middle School,Qujing 655000,China)
出处
《生物化工》
2025年第6期11-15,共5页
Biological Chemical Engineering
基金
曲靖师范学院光催化净化光伏废水和回收退役光伏器件中贵金属博士创新团队(2023-22)
云南峻旭建设工程有限公司环保技术咨询项目(2106500988T650)
大学生创新创业训练计划(S202410684039)。
