Kumar Panneer Selvam Sathish, Raj Michael Ruby, Anandan Sambandam, Zhou Meifang, Ashokkumar Muthupandian
Nanomaterials and Solar Energy Conversion Lab, Department of Chemistry, National Institute of Technology, Tiruchirappalli 620015, India.
Water Sci Technol. 2009;60(6):1589-96. doi: 10.2166/wst.2009.496.
Photocatalytic degradation of acid red 88 (AR88) in aqueous suspensions of Au-ZnO nanoparticles under visible light illumination was studied in order to evaluate various effects of the Au deposition on the ZnO photocatalytic activity. Au-ZnO nanoparticles were prepared by deposition precipitation method and characterized by different analytical techniques. In Au-ZnO system, all gold nanoparticles were tethered on the surface of zinc oxide particles. This enhanced the AR88 adsorption on the Au-ZnO surface and acted as electron traps which is the main reason for significant enhancement in the AR88 photodegradation under visible light illumination compared to ZnO alone. Further in the presence of electron acceptors complete decolorization of the dye was observed, which might be due to immediate trapping of the photogenerated electrons by electron acceptors.
为了评估金沉积对氧化锌光催化活性的各种影响，研究了在可见光照射下金 - 氧化锌纳米颗粒水悬浮液中酸性红88（AR88）的光催化降解。通过沉积沉淀法制备了金 - 氧化锌纳米颗粒，并采用不同的分析技术对其进行了表征。在金 - 氧化锌体系中，所有金纳米颗粒都附着在氧化锌颗粒表面。这增强了AR88在金 - 氧化锌表面的吸附，并充当电子陷阱，这是与单独的氧化锌相比，在可见光照射下AR88光降解显著增强的主要原因。此外，在电子受体存在的情况下，观察到染料完全脱色，这可能是由于光生电子被电子受体立即捕获所致。
