基于氰胺锌的复合光催化剂的结构与可见光催化性能
Structure and Visible-Light Induced Photocatalytic Activity of Zinc Cyanamide-Based Photocatalysts
荣凤鸣 1王誉 1张霞1
作者信息
- 1. 东北大学理学院化学系 沈阳 110819
- 折叠
摘要
应用锌盐与氨水以及单氰胺水溶液间配体交换反应,制备了氰胺锌(ZnNCN)颗粒.并通过在前驱体盐溶液中共混银盐,利用相同的配体交换反应过程,制备了氰胺银(Ag2NCN)/ZnNCN复合颗粒.利用XRD、SEM、红外光谱(FT-IR)和紫外-可见(UV-Vis)吸收光谱对光催化剂的结构进行表征.结果表明,单一ZnNCN为花瓣状颗粒,宽禁带半导体材料(禁带宽度Eg=4.71 eV).Ag2NCN/ZnNCN复合颗粒形貌与单一ZnNCN和Ag2NCN相比有很大变化,2种金属氰胺化物以弱的物理作用力结合形成异质结构,复合颗粒的光谱响应范围扩展至可见光区,Eg=2.05 eV.以罗丹明B为光催化降解对象,研究了ZnNCN、Ag2NCN/ZnNCN复合颗粒在氙灯激发下的光催化活性.与单一ZnNCN以及AgNCN+ZnNCN机械混合物相比,Ag2NCN/ZnNCN复合颗粒表现出增强的光催化性能,表现为一级反应动力学特征.
Abstract
Semiconductor-based photocatalytic technology,using abundant and renewable sunlight as an induced light source represents an emerging successful technology to solve the global energy and environmental challenges.Considerable efforts have been paid to develop novel photocatalysts with good response to sunlight and high quantum conversion efficiency.In this work,single ZnNCN microparticles have been prepared by the ligand exchange reaction between zinc salt,ammonia and cyanamide.And Ag2NCN/ZnNCN hetero structure has been also fabricated using the same ligand exchange process but mixing the silver salt with zinc salt together.Some means,such as XRD,SEM,infrared spectroscopy (FT-IR) and ultraviolet visible spectrometer (UV-Vis) were used to characterize the samples.The results showed that the single ZnNCN was flower-like particles with wide band gap (Eg=4.71 eV).Compared with single ZnNCN,the Ag2NCN/ZnNCN composite particles presented different morphology with rough surface,and physical interaction was existed between two kinds of metal cyanamide for Ag2NCN/ZnNCN composites.Because of the heterostructure,the light response spectrum for Ag2NCN/ZnNCN composite particles was extended to the visible light region,and the band gap was changed to 2.05 eV.The photocatalytic activity of Ag2NCN/ZnNCN composite particles in the degradation of Rhodamine B under Xenon irradiation was investigated,meanwhile,single ZnNCN and the mixture of Ag2NCN and ZnNCN was also applied in the photocatalysis under same conditions for comparison.The apparently enhanced photocatalytic activity of Ag2NCN/ZnNCN heterostructure was observed,and a first-order kinetic was discussed.
关键词
可见光催化/氰胺锌/氰胺银/配体交换反应Key words
visible-light photocatalysis/zinc cyanamide/silver cyanamide/ligand exchange reaction引用本文复制引用
基金项目
国家自然科学基金(21501023)
和国家级大学生创新创业训练计划项目(201610145019)
出版年
2018
NETL
NSTL
维普
万方数据