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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 by a simple and efficient method. The microstructure of the sample was characterized by UV-Vis DRS, XRD, SEM and TEM. The results show that the TiO2 in the composite catalyst mainly exists in the anatase phase and the particle size is about 25 nm. The CdS exists in the tetragonal phase with the particle size of about 12 nm. Increasing dosage of coupling agent can promote the absorption of visible light by the catalyst, extending the absorption boundary to 570 nm and entering the visible light region. Visible light system, the catalyst dosage 1.5 g / L, the initial concentration of berberine 80 mg / L under the conditions of each catalyst within 4 h of berberine degradation were: CdS-TiO2> CdS> TiO2. CdS-TiO2 can transfer electrons between the two semiconductors and improve the activity of the catalyst.