氧化钨及其水合物光催化性质研究

摘要

Tungsten trioxides and tungsten trioxide hydrates were synthesized via mixing tungsten with H2 O2 in a water bath.Samples were characterized by X-ray diffraction (XRD),X-ray photoelectron spectroscopy (XPS),cyclic voltammetry (CV).The UV-visible photo activity was evaluated through the photo degradation of methyl orange in aqueous solution.The effects of photoreaction conditions on the photoactivity of the ob-tained samples were investigated in detail.Cyclic voltammetry measurements showed that WO3 ·0.33H2 O, WO3 ·H2 O and WO3 have different oxidation-reduction potentia,that lead to a higher conductive band of WO3 ·0.33H2O than H+/H2.The experimental results indicated that photoactivity of WO3·0.33H2O was deeply related with the crystal structure and energy band structure.%钨粉和双氧水过氧聚钨酸法制备出了 WO 3及其水合物 WO3·0.33H2O、WO3·H2O 纳米材料。紫外-可见光催化降解甲基橙溶液测试表明 WO 3·0.33H2 O 具有优越的紫外光催化性能和明显的可见光催化能力。通过 XRD、FT-IR、XPS、电化学、紫外光催化等测试手段对物质的晶相、晶体结构和性能进行分析。结果表明 WO3·0.33H2O 和 WO3·H2O 具有不同于 WO 3的 W -O 双键结构；但是 WO 3·0.33H2 O具有更宽的带隙和更负的氧化还原电位，解释了其独特的光催化性能产生的原因。