摘要
银系光催化剂制备方法简单且带隙较窄,在可见光照射下具有良好的光催化效果,因此受到人们的广泛关注。以罗丹明B为降解物,在模拟可见光条件下利用碳酸银进行光催化降解实验,比较同等条件下碳酸银和二氧化钛的光催化性能,探究了碳酸银在不同pH、降解物质量浓度和催化剂投加量条件下的光催化活性,并利用总有机碳(TOC)分析矿化程度。通过X射线衍射仪(XRD)、激光拉曼光谱仪(RRS)、傅里叶变换红外光谱仪(FT-IR)和紫外吸收光谱仪(UV-Vis)对碳酸银进行表征并分析其晶相组成。结果表明,在同等条件下碳酸银对罗丹明B的光催化降解速率远大于二氧化钛,并且在溶液pH小于7、碳酸银投加量为1 g/L条件下催化剂对质量浓度为5 mg/L的罗丹明B染料的光催化降解效果最好,紫外灯照射100 min后罗丹明B染料降解率达到98%以上,最终矿化率达到66%。
Silver-based photocatalysts have attracted extensive attention due to their good photocatalytic effects under visible light irradiation,which have simple preparation method and narrow band gap.Using Rhodamine B as a degradant,the photolytic degradation experiment was carried out by using silver carbonate(Ag2CO3)under simulated visible light to characterize its photocatalytic performance.The photocatalytic performance of Ag2CO3 and TiO2 under the same conditions was compared.The photocatalytic activities of Ag2CO3 under the different p H,degradation concentration and Ag2CO3 mass were investigated and the mineralization degree was analyzed by using TOC.Ag2CO3 was characterized and its crystal phase composition was analyzed by X-ray diffractometry(XRD),laser Raman spectroscopy(RRS),Fourier transform infrared spectroscopy(FT-IR)and ultraviolet absorption spectroscopy(UV-Vis).Results showed Ag2CO3 had the better photolytic degradation rate than TiO2 under the same conditions.Under the conditions,such as solution p H of less than 7 and the Ag2CO3 dosage of 1 g/L,the photocatalytic degradation effect of catalyst on Rhodamine B with the mass concentration of 5 mg/L was the best.After 100 min of UV lamp irradiation,the degradation rate of Rhodamine B dye was above 98%,and the final mineralization rate was 66%.
作者
安伟佳
谢婉丽
An Weijia;Xie Wanli(North China University of Science and Technology,Tangshan 063210,China)
出处
《无机盐工业》
CAS
CSCD
北大核心
2020年第3期107-111,共5页
Inorganic Chemicals Industry
基金
大学生创新训练计划项目(X2018069)