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为了提高二氧化钛在可见光下的光催化性能,通过水解超声法合成CdS/TiO_2复合粉末,并以甲醛溶液为污染物,在可见光照射条件下对其进行光催化净化,分别考察了CdS/TiO_2摩尔比、反应温度、反应时间和超声时间等影响因素。采用扫描电子显微镜(SEM)、X-射线衍射(XRD)、傅立叶红外光谱(FT-IR)对所得样品进行表征。结果表明:当CdS/TiO_2摩尔比为0.75,超声时间为30min,反应时间为90min,反应温度为70℃时,制备得到的样品由锐钛矿相TiO_2、立方晶相和六方晶相CdS组成,光催化活性最佳,在可见光下光催化净化甲醛180min后,降解率达到40.12%。
In order to improve the photocatalytic activity of titania under visible light, CdS / TiO 2 composite powders were synthesized by hydrolytic sonication. The formaldehyde solution was used as the pollutant and photocatalyzed under visible light irradiation. The CdS / TiO 2 molar ratio , Reaction temperature, reaction time and ultrasonic time and other influencing factors. The obtained samples were characterized by SEM, XRD and FT-IR. The results show that when the molar ratio of CdS / TiO 2 is 0.75, the ultrasonic time is 30 min, the reaction time is 90 min and the reaction temperature is 70 ℃, the prepared sample is composed of anatase phase TiO 2, cubic phase and hexagonal CdS. The photocatalytic activity was the best. After photocatalytic purification of formaldehyde in visible light for 180min, the degradation rate reached 40.12%.