一维纳米h-MoO3的制备及其光催化降解罗丹明B的研究

Preparation of one-dimensional nano-sized h-MoO_3 and its photocatalytic degradation of Rhodamine B

为考察六方相三氧化钼(h-MoO_3)对罗丹明B废水体系的光催化降解能力,以钼酸铵[(NH)6Mo7O24·4H2O]为原料,通过沉淀法合成了一维纳米六方相h-MoO_3。在实验中着重考察了光照强度、反应体系p H值、催化剂用量及催化剂浓度对罗丹明B降解效果的影响,并利用X射线衍射谱(XRD)、扫描电子显微镜(SEM)、紫外漫反射光谱分析(DRS)、N2吸脱附等方法对h-MoO_3的物相、结构、形貌进行表征。结果表明:0. 045 g h-MoO_3在250 W汞灯照射下,对p H=4、浓度为50 mg/L的罗丹明B溶液的降解率可达94. 2%,进一步证明了合成的一维纳米h-MoO_3是一种性能优良的光催化剂。

In order to investigate the photocatalytic degradation of hexagonal molybdenum trioxide(h-MoO3)to Rhodamine B wastewater system,one-dimensional nano h-MoO3 was synthesized which using ammonium molybdate[(NH4)6 Mo7O24·4H2O]as reactant.The effects of light intensity,pH of the reaction system,amount and concentration of catalyst to the degradation of Rhodamine B were investigated.The phase,structure and morphology of h-MoO3 were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),ultraviolet diffuse reflectance spectroscopy(DRS)and N2 adsorption-desorption.The results shows that the degradation rate of Rhodamine B by 0.045 g h-MoO3 can reach 94.2%,under the condition of 250 W,pH=4 and concentration of 50 mg/L.It is proved that the one-dimensional nano h-MoO3 is an excellent photocatalyst.