Department of Physics and Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, Wuhan University, Wuhan 430072, China.
Chem Asian J. 2013 Jan;8(1):204-11. doi: 10.1002/asia.201200768. Epub 2012 Nov 13.
Layered protonated titanate nanosheets (LPTNs) loaded with silver nanoparticles are prepared by a simple one-pot hydrothermal route in silver-ammonia solution. The as-synthesized Ag-loaded LPTNs possess large specific surface area. The Ag nanoparticles are highly dispersed on the surface of the LPTNs. They have negligible effects on the crystal structure, crystallinity, and surface area of the LPTNs but result in considerable enhancement of visible-light absorption and in a red-shift of the band gap for the LPTNs. The Ag-loaded LPTNs show enhanced photocatalytic activity for both liquid- and gas-phase reactions under visible-light irradiation. Moreover, the photocatalytic activity first increases gradually with increasing Ag loading content, and then decreases after maximizing at an optimal Ag content. At the Ag loading content of 2.87 mol% and 1.57 mol%, the Ag-loaded LPTNs exhibit the highest visible-light photocatalytic activity for degradation of rhodamine B in water and mineralization of benzene in air, respectively. An alternative possible mechanism for the enhancement of the visible-light photocatalytic activity is also proposed.
负载银纳米颗粒的层状质子化钛酸盐纳米片（LPTNs）通过在银氨溶液中的简单一锅水热路线制备。所合成的负载 Ag 的 LPTNs 具有大的比表面积。Ag 纳米颗粒高度分散在 LPTNs 的表面上。它们对 LPTNs 的晶体结构、结晶度和比表面积几乎没有影响，但导致可见光吸收的显著增强和带隙的红移。负载 Ag 的 LPTNs 在可见光照射下对液相和气相反应均表现出增强的光催化活性。此外，光催化活性先随着 Ag 负载含量的增加而逐渐增加，然后在最佳 Ag 含量下达到最大值后减小。在 Ag 负载含量为 2.87 mol%和 1.57 mol%时，负载 Ag 的 LPTNs 在降解水中的罗丹明 B 和空气中的苯矿化方面表现出最高的可见光光催化活性。还提出了增强可见光光催化活性的另一种可能机制。
