制备方法对Cd_(0.1)Cu_(0.01)Zn_(0.89)S光催化剂产氢性能的影响

Study on Photocatalytic Activity for Hydrogen Evolution over Cd_(0.1)Cu_(0.01)Zn_(0.89)S Catalysts by Different Synthesis Methods

通过共沉淀法、水热法以及高温硫化法分别合成了Cd0.1Cu0.01Zn0.89S新型光催化剂,并通过XRD、SEM和UV-vis吸收光谱等技术对催化剂进行了表征.从UV-vis吸收光谱可以发现,Cu2+的加入都引起了催化剂吸收边不同程度的红移.在产氢测试中发现,高温合成的催化剂产氢能力反而下降.在3种催化剂中,共沉淀法合成的催化剂具有最高的产氢活性,无负载时在可见光照射下产氢速率为350μmol/h,而水热法和高温硫化法合成的催化剂的产氢速率分别只有120μmol/h和13μmol/h.

CdxCuyZn1-x-y S photocatalysts were prepared by coprecipitation, hydrothermal and thermal sulfidation methods. They were characterized by XRD, SEM, BET and UV-vis spectra. The UV-vis spectra showed that the absorption edge of the photocatalysts which contained Cu^2＋ had a red shift compared with that of Cd0.1Zn0.9 S. It was found that the photoactivity decreased when the temperature in the preparing process increased. The photocatalyst prepared by coprecipitation method had the highest photoactivity. Its rate of hydrogen production without any cocatalysts was 350 μmol/h under visible light irradiation. Moreover, the rates of the photocatalysts prepared by hydrothermal and thermal sulfidation methods were only 120 μmol/h and 13 μmol/h, respectively.