利用共沉淀一步法在常温下合成具有高光催化活性的ZnxCd1-xS固溶体光催化剂,用XRD、SEM、XPS、BET、UV-VIS DRS和PL对制备出的ZnxCd1-xS样品进行结构和光学性能的表征,并在模拟太阳光照射下对罗丹明B（RhB）溶液进行降解,评价其光催化活性。结果表明,ZnxCd1-xS对可见光的吸收阀值随Zn含量增加而减少,禁带宽度随之增大;颗粒状ZnxCd1-xS固溶体对罗丹明B具有较高的光催化活性,其中Zn0.8Cd0.2S的光催化性能最优,在90 min内对RhB的降解率达到98.5%,远高于CdS和ZnS光催化剂;经过4次重复使用后,Zn0.8Cd0.2S对RhB的降解率维持在75%以上。Zn0.8Cd0.2S的比表面积和孔隙体积相对于CdS分别增至154.6 m2/g和0.40 cm3/g,其光催化活性显著增强的主要原因是由于其较高的光生电子空穴对的分离效率及较低的复合率。
Abstract
ZnxCd1-xS solid solution photocatalysts with high photocatalytic activity were prepared by the coprecipitation one-step method at room temperature. The structural and optical properties of the as-prepared samples were characterized by XRD, SEM, XPS, BET, UV-VIS DRS and PL. Photocatalytic activity of the samples was evaluated via degrading the Rhodamine B solution under simulated sunlight. The results show that the visible light absorption threshold of ZnxCd1-xS decreases with the increase of Zn, while the band gap increases gradually. Moreover, the granular ZnxCd1-xS exhibits excellent photocatalytic activity for the degradation of Rhodamine B, and Zn0.8Cd0.2S has the best photocatalytic performance among the as-prepared samples. The degradation rate of Zn0.8Cd0.2S for Rhodamine B reaches 98% within 90 min, which is much higher than that of CdS and ZnS. After four recycles, the RhB degradation is still more than 75%. Compared with CdS, the specific surface area and pore volume of Zn0.8Cd0.2S increase to 154.6 m2/g and 0.40 cm3/g, respectively. The main reasons for the enhanced photocatalytic activity are the effective separation efficiency of photogenerated electron-hole pairs and the lower recombination rate.
关键词
共沉淀 /
罗丹明B /
降解 /
ZnxCd1-xS /
光催化活性
Key words
coprecipitation /
Rhodamine B /
degradation /
ZnxCd1-xS /
photocatalytic activity
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基金
煤矿灾害动力学与控制国家重点实验室自主研究重点项目（2011DA105287-zd201904）
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