摘要
采用简单高效的方法制备CdS-TiO2复合光催化剂,用UV-Vis DRS、XRD、SEM和TEM对样品进行了微观结构表征。结果表明,复合催化剂中TiO2主要以锐钛矿形态存在,颗粒尺寸约为25 nm;CdS以四方相形态存在,颗粒尺寸约为12 nm。偶联剂投加量的增加可促进催化剂对可见光的吸收能力,使吸光边界扩展到570 nm,进入可见光区域。可见光体系中,催化剂投加量1.5 g/L、黄连素初始质量浓度80 mg/L的条件下,各催化剂4 h内对黄连素的降解效果依次为:CdS-TiO2>CdS>TiO2。CdS-TiO2可实现电子在两种半导体间的转移,提高催化剂活性。
The CdS-TiO2 composite photocatalyst was prepared in an easy and efficient way.The structural and optical properties of CdS-TiO2 composite photocatalyst were characterized by ultraviolet-visible diffuse reflection spectroscopy（UV-Vis DRS）,X-ray powder diffraction（XRD）,scanning electron microscopy（SEM）,and transmission electron microscopy（TEM）.The results show that the particles size of TiO2is about 25 nm and the crystalloid of TiO2is anatase.The particle size of CdS is about 12 nm and the crystalloid of CdS is zinc blende.The results of UV-Vis DRS indicate that the absorbing capacity of composite photocatalyst for visible light increases,absorption boundary extended to 570 nm,with increasing the coupling agent dosage.The photocatalytic activity of the photocatalyst was evaluated by photocatalytic degradation of berberine.when the catalyst dosage is 1.5 g/L and the initial concentration of berberine is 80 mg/L within 4 h under the visible light,the degradation rate of catalysts for berberine as follows： CdS-TiO2＆gt;CdS＆gt;TiO2.CdS-TiO2can realize electron transfer between the two kinds of semiconductor and improve the catalyst activity.
出处
《水处理技术》
CAS
CSCD
北大核心
2013年第3期67-72,共6页
Technology of Water Treatment
基金
福建省光催化重点实验室-省部共建国家重点实验室培育基地基金项目资助
