前驱物中Mo(Ⅵ)浓度对h-MoO_3的制备及其光催化性能的影响  

Influence of Mo(Ⅵ) Concentration in Precursors on Preparation and Photocatalytic Activity of h-MoO_3 Crystallites

作　　者：马凤兰[1] 曹丽云[1] 黄剑锋[1] 吴建鹏[1] 

机构地区：[1]陕西科技大学材料科学与工程学院,西安710021

出　　处：《硅酸盐学报》2013年第6期867-870,共4页Journal of The Chinese Ceramic Society

基　　金：陕西省国际科技合作重点项目(2011KW-11);陕西省自然科学基金(2010JM6001);陕西省教育厅专项项目(2010JK444);陕西省教育厅自然科学专项基金项目(09JK361);陕西科技大学材料科学与工程学院创新基金资助

摘　　要：以分析纯钼酸铵((NH4)6Mo7O24 4H2O)和硝酸(HNO3)为原料,采用水热法制备了六方相结构的h-MoO3微晶。通过X射线衍射和扫描电子显微镜分别对在不同Mo(Ⅵ)浓度的钼酸铵溶液中所制备产物的物相组成、显微结构进行了分析。并以亚甲基蓝染料为目标降解物,评价了不同Mo(Ⅵ)浓度制备的h-MoO3微晶的光催化性能。结果表明:无模板剂条件下,当Mo(Ⅵ)浓度为0.04～0.60mol/L时均可合成单一物相、六方棒状结构的h-MoO3微晶,且随着Mo(Ⅵ)浓度提高,棒的尺寸逐渐增大。在可见光照射下,Mo(Ⅵ)浓度为0.07mol/L时制备的h-MoO3样品的光催化降解亚甲基蓝的效果最明显,在光照100min后光催化降解率达到了99.7%。The hexagonal h-MoO3 crystallines were synthesized by a hydrothermal method using analytical grade reagents ammo- nium molybdate （（NH4）6Mo7O24.4H2O） and nitric acid （HNO3） as raw materials. The phase and morphology of the samples prepared in ammonium molybdate solution with different Mo（Ⅵ） concentrations were characterized by X-ray diffraction and scanning electron microscopy, respectively. The photocatalytic property of the h-MoO3 samples prepared at different Mo（Ⅵ） concentrations was evalu- ated by using methylene blue dye as target degradation products. The results show that in the Mo（Ⅵ） concentration range from 0.04 mol/L to 0.6 mol/L, the pure and hexagonal rod structured h-MoO3 microcrystalline is obtained without any template agent. The size of the rod increases with the increase of Mo（Ⅵ） concentration. It is indicated that after the visible light irradiation, the samples pre- pared at Mo（Ⅵ） concentration of 0.07 mol/L and the irradiation time of 100 min have the superior photocatalytic performance for the degradation of methylene blue, and the degradation rate reaches 99.7%.

关 键 词：三氧化钼微晶 水热法 六价钼离子浓度 光催化降解率 

分 类 号：TB321[一般工业技术—材料科学与工程]