W(Ⅴ)掺杂MoO_3微纳米片的静电纺丝制备及光催化活性

The preparation of W(Ⅴ) doped MoO_3 micro-nanoplates by electrospinning and their photocatalytic activity

采用静电纺丝技术结合溶胶过程制备W(Ⅴ)掺杂的PVP/(NH_4)_6Mo_7O_(24)·4H_2O前躯体,经缓慢控温焙烧前躯体,600℃时获得结晶度良好的MoO_3及Mo_(0.97)W(V)_(0.03)O_(3-δ)微纳米片.通过热重-差热分析(TG-DTA)、X-射线光电子能谱(XPS)、红外光谱(FT-IR)、X-射线粉末衍射(XRD)、场发射扫描电子显微镜(FE-SEM)和紫外-可见分光光度计(UVVis)等表征手段研究W(Ⅴ)掺杂对MoO_3微纳米片晶体生长和结构的影响;以亚甲基蓝(MB)的光降解为模型反应研究其光催化性能.结果表明,热处理温度600℃时生成的Mo_(0.97)W(Ⅴ)_(0.03)O_(3-δ)微纳米片光催化活性最好.

W（Ⅴ） doped PVP/（NH4）6Mo7O（24）·4H2O precursors was fabricated by electrospinning technique combined with sol process and then the electrospun precursors were calcined through slow temperature control. Good crystallinity of MoO3 and Mo（0.97）W（Ⅴ）（0.03）O（3-δ） micro-nanoplates were obtained after calcined at 600 ℃. The effects of crystal growth and structure of W（Ⅴ） doped MoO3 micro-nanoplates were carefully studied by thermal gravimetric and differential thermal analysis（TG-DTA）, X-ray photoelectron spectroscopy（XPS）,Fourier transform infrared spectroscopy（FT-IR）, X-ray spectroscopy（XRD）, Scanning electron microscopy（FESEM） and the UV–Vis diffuse reflectance spectroscopy（DRS）. The photocatalytic performance of MoO3micro-nanoplates was evaluated by the photocatalytic degradation of methylene blue（MB） under visible light irradiation. Our results showed that the photocatalytic activity of Mo（0.97）W（Ⅴ）（0.03）O（3-δ）micro-nanoplates by heat treatment at 600 ℃ was the best, and its photocatalytic mechanism was also discussed.