Kmetykó Ákos, Mogyorósi Károly, Pusztai Péter, Radu Teodora, Kónya Zoltán, Dombi András, Hernádi Klára
Research Group of Environmental Chemistry, Institute of Chemistry, University of Szeged, Tisza L. krt. 103., H-6720 Szeged, Hungary.
Department of Applied and Environmental Chemistry, University of Szeged, Rerrich tér 1., H-6720 Szeged, Hungary.
Materials (Basel). 2014 Nov 26;7(12):7615-7633. doi: 10.3390/ma7127615.
One weight percent of differently sized Au nanoparticles were deposited on two commercially available TiO₂ photocatalysts: Aeroxide P25 and Kronos Vlp7000. The primary objective was to investigate the influence of the noble metal particle size and the deposition method on the photocatalytic activity. The developed synthesis method involves a simple approach for the preparation of finely-tuned Au particles through variation of the concentration of the stabilizing agent. Au was deposited on the TiO₂ surface by photo- or chemical reduction, using trisodium citrate as a size-tailoring agent. The Au-TiO₂ composites were synthetized by reduction or by mixing the titania suspension with a previously prepared gold sol. The H₂ production activities of the samples were studied in aqueous TiO₂ suspensions irradiated with near-UV light in the absence of dissolved O₂, with oxalic acid or methanol as the sacrificial agent. The H₂ evolution rates proved to be strongly dependent on Au particle size: the highest H₂ production rate was achieved when the Au particles measured ~6 nm.
将1重量百分比不同尺寸的金纳米颗粒沉积在两种市售的二氧化钛光催化剂上：Aeroxide P25和Kronos Vlp7000。主要目的是研究贵金属颗粒尺寸和沉积方法对光催化活性的影响。所开发的合成方法涉及一种简单的方法，通过改变稳定剂的浓度来制备经过精细调节的金颗粒。使用柠檬酸三钠作为尺寸调整剂，通过光还原或化学还原将金沉积在二氧化钛表面。通过还原或将二氧化钛悬浮液与预先制备的金溶胶混合来合成金-二氧化钛复合材料。在没有溶解氧的情况下，以草酸或甲醇作为牺牲剂，在近紫外光照射的二氧化钛水悬浮液中研究了样品的产氢活性。结果表明，产氢速率强烈依赖于金颗粒尺寸：当金颗粒尺寸约为6nm时，产氢率最高。
