层状纳米光催化复合材料HNb WO_6/Pt的合成及性质

Synthesis and Property of HNb WO_6/Pt Layered Nanocomposite Photocatalyst

用固相合成法合成出LiNbWO6,并用离子交换法制备出HNbWO6;通过PrNH2 层间膨胀、Pt(NH3 ) 2 + 4层间插入和紫外光分解等反应 ,合成出一种新的层状光催化纳米复合材料HNbWO6/Pt ,并比较了不同合成方法对样品性能的影响 .X射线衍射、漫反射、ICP和比表面积测定等的表征结果表明 :该样品的层间高度为 0 .3～ 0 .5nm ,禁带能隙为 2 .2 5～ 3.10eV .用波长大于 2 90nm的 45 0W汞灯照射 5h ,1g样品可催化分解甲醇溶液 (10 % )产生氢气约 40ml。

HNbWO 6 was prepared by calcining stoichiometric mixture of Li 2CO 3, WO 3 and Nb 2O 5 followed by ion exchange reaction with HNO 3. HNbWO 6/Pt layered nanocomposite photocatalyst was synthesized by successive reaction of HNbWO 6 with n PrNH 2 and [Pt(NH 3) 4]Cl 2 under UV light irradiation. The influence of different preparation methods on property of HNbWO 6/Pt was compared. The results of XRD, DRS(diffuse reflectance spectrum), ICP(inductivity coupled plasma) and specific surface area measuremtents for the samples indicated that, for HNbWO 6/Pt, the gallery height was 0.3～0.5 nm, the band gap energy was 2.25～3.10 eV. Under irradiation with λ >290 nm from a Hg lamp of 450 W for 5 h, about 40 ml of hydrogen was produced from 1 250 ml of methanol solution(10%) containing 1 g of dispersed HNbWO 6/Pt.