采用静电纺丝技术在不同退火条件下制备不同物相的Nb2Q纳米纤维,研究了产物的物相对光催化染料降解性能的影响.光吸收结果表明,伪六方相Nb2O5纳米纤维的光学带隙为2.77 eV,单斜相为主的混合相Nb2O5纳米纤维带隙为2.51 eV.在混合相材料中,光学带隙随着单斜相成分的增加而改变.光催化结果表明,伪六方相Nb2O5纳米纤维具有最高的光催化活性,其效率k值可达-0.025 min-1.混合相纳米纤维中,单斜相的增加会引起催化活性的变化,其变化趋势与带隙相符.物相对Nb2O5纳米纤维光催化活性的影响可归结于带隙变化引起的入射光吸收效率和电子空穴对氧化能力的变化.
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