钨/钼/磷钨/磷钼酸铋盐的催化性能

利用水热和共沉淀法合成了钨酸铋、钼酸铋、磷钨酸铋和磷钼酸铋4种铋系催化剂,通过红外光谱(IR)、紫外光谱(UV-vis)、荧光光谱(FL)、X-ray粉末衍射(XRD)和扫描电镜(SEM)等手段对所合成样品的形貌和性质进行表征.从制备条件、焙烧温度、不同降解底物等方面对4种催化剂的催化降解性能进行探究和对比,发现当钨酸铋催化剂中W与Bi物质的量之比为1∶2的未焙烧的催化剂催化降解4mg/L的罗丹明B(RhB)的效果最佳,可达98.1%,并对甲基橙、亚甲基蓝等多种有机污染物有一定的催化降解效果;钨酸铋、钼酸铋催化剂也分别对RhB、甲基橙、亚甲基蓝等有良好的催化效果;而磷钼酸铋对上述污染物催化降解效果较差.

Catalytic Performance of Tungstate/Molybdate/Phosphotungstic/Phosphomolybdate Acid Bismuth Salt

Bi₂WO₆,Bi₂MoO₆,BiPW₁₂O₄₀ and BiPMo₁₂O₄₀ catalysts were synthesized by hydrothermal and co-precipitation method and characterized by IR,UV-vis,FL,SEM and X-ray power diffraction (XRD).The relationship between catalytic performance of catalysts and preparation conditions,calcination temperature and different substrates was explored.The best degradation of RhB (100 mL 4 mg/L) achieved 98.1% over the unbaked Bi2WO6 with the W/Bi molar rate 1∶2,which also had certain catalytic effect for degrading methyl orange and methylthionine chloride.The tungstate bismuth and molybdate bismuth catalysts had a good catalytic effect for degrading RhB,methyl orange and methylthionine chloride as well.The catalytic performance of phosphomolybdate bismuth was poorer.