碳酸银光催化性能研究

doi:10.11962/1006-4990.2019-0251

摘要/Abstract

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%。

关键词: 碳酸银, 罗丹明B, 光催化

Abstract:

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 pH,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 pH 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%.

Key words: Ag₂CO₃, Rhodamine B, photocatalyst

中图分类号:

TQ131.22

安伟佳,谢婉丽. 碳酸银光催化性能研究[J]. 无机盐工业, 2020, 52(3): 107-111.

An Weijia,Xie Wanli. Study on photocatalytic performance of silver carbonate[J]. Inorganic Chemicals Industry, 2020, 52(3): 107-111.

图/表 6

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