铌酸钾纳米管的制备及其光催化还原水制氢研究

Preparation of Potassium Hexaniobate Nanotubes and Their Photocatalytic Hydrogen Evolution from Water Reduction

以铌酸钾颗粒为前驱体,经酸化和剥落处理,在简单、温和的条件下制得铌酸钾纳米管。透射电镜结果表明,产物具有管状形貌,且管形完整、管径分布窄、长径比大。研究了铌酸钾纳米管在紫外光照射下的光催化还原水制氢性能,铌酸钾纳米管的活性明显高于铌酸钾颗粒,负载Pt的铌酸钾纳米管的制氢活性明显提高,在pH=3的10%(体积分数)甲醇水溶液中负载1.5%铂的铌酸钾纳米管的产氢活性(18.8 mmol/g.h)最高,是铌酸钾纳米管负载前(0.385 mmol/(g.h))的48.8倍。

Potassium hexaniobate nanotubes were prepared using potassium hexaniobate particles as precursor at a simple and mild condition via the acid-exchanging and exfoliating processes.The results of transmission electron microscopy（TEM） showed that the product possessed favorable tubular morphology with narrow size distribution and large aspect ratio.The photocatalytic hydrogen evolution activity of potassium hexaniobate nanotubes from water reduction was studied under ultraviolet light irradiation.The photocatalytic activity of potassium hexaniobate nanotubes is higher than that of potassium hexaniobate particles.Loading platinum on the surface of potassium hexaniobate nanotubes can significantly improve their hydrogen evolution rate.The highest hydrogen evolution rate（18.8 mmol/（g·h）） was obtained by loading 1.5% platinum in 10 %φ_b methanol aqueous solution at pH = 3,which was 48.8 times higher than that of the original potassium hexaniobate nanotubes（0.385 mmol/（g·h））.