不同形貌WO_3的水热合成及其在水处理中的应用研究

Hydrothermal Synthesis of Tungsten Trioxide with Different Morphologies and their Application in Water Treatment

三氧化钨(WO3)以其较窄的带隙,成为继二氧化钛(TiO2)之后颇具发展潜力的n型半导体光催化剂.本文采用水热合成法,通过调控反应参数,如原料组成、沉淀时间等,合成了不同形貌和晶型的WO3;采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、傅里叶变换红外光谱(FT-IR)、氮气吸附-脱附(N2adsorption-desorption)等表征了所合成的WO3产品,发现原料组成、沉淀时间等条件对WO3的晶型和形貌都有影响;研究了所合成的WO3产品去除水中亚甲基蓝染料污染物的性能,结果表明,所制备的WO3对水中亚甲基蓝具有较好的去除效果,去除率可达97%.

Tungsten trioxide（WO3） with narrow band gap,becomes a promising n-type semiconductor photocatalyst after titanium dioxide（TiO2）.In this work,WO3 nanostructures were synthesized by hydrothermal method.Different morphologies and crystalline structures could be obtained by tailoring reaction parameters,such as precursor composition and precipitation time,etc.The as-prepared WO3 products were characterized by X-ray diffraction（XRD）,scanning electron microscopy（SEM）,transmission electron microscopy（TEM）,Fourier transform infrared spectroscopy（FT-IR）,and N2 adsorption-desorption.The precursor composition and precipitation time were found to largely affect the morphology and crystalline structure of WO3 nanostructures.The obtained WO3 products were applied for the removal of methylene blue in aqueous solution.It showed that all the obtained WO3 nanostructures exhibited high activities for the removal of methylene blue,and 97 % of methylene blue could be removed.