利用纳米铸造法, 以立方有序介孔分子筛MCM-48为硬模板, 550℃成功制备了结晶良好的纯相单斜介孔BiVO4. 采用XRD、TEM、BET及UV-Vis光谱分析对样品的结构进行了表征, 结果表明: 与水热法制备的大颗粒样品相比, “纳米铸造”介孔BiVO4的平均孔径为16.8nm, 孔体积为0.1 cm2/g, 比表面积高达22.9 m2/g, 有效减少了光生电子和空穴复合的几率, 在可见光范围内表现出优良的可见光催化活性, 90min内对乙基黄原酸钾的光催化降解率高达78%.
Ordered nanocrystalline mesoporous BiVO4 with pure phase was successfully synthesized at 550℃ via nanocasting using cubic MCM-48 molecular sieves as hard template. The long-range ordered mesostructure was characterized by XRD, TEM, BET as well as UV-Vis spectrophotometer. Compared with the BiVO4 synthesized by conventional hydrothermal method, the nanocasting mesoporous BiVO4 has the average pore diameter of 16.8nm, pore volume of 0.1 cm3/g and specific surface area up to 22.9 m2/g. The structure decreases the recombination of optical excitation electrons and holes efficiently, so the mesoporous BiVO4 has an excellent photocatalytic activity in the visible light region. As a result, the photocatalytic efficiency of mesoporous BiVO4 for xanthate in 90min reaches 78%.
参考文献
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