S掺杂的HTiNbO5纳米片: 一种新型高效可见光催化剂

将层状HTiNbO₅剥层絮凝成HTiNbO₅纳米片, 然后与硫脲焙烧, 制得了S掺杂的HTiNbO₅纳米片. 与原始HTiNbO₅和HTiNbO₅纳米片相比, 该样品具有较大的比表面积和明显的可见光吸收. 以罗丹明B为降解物, 评价了该催化剂的吸附性能和可见光催化性能. 结果表明, HTiNbO₅纳米片和S掺杂的HTiNbO₅纳米片都具有很好的吸附能力和很高的可见光降解速率. 然而, 对于罗丹明B的矿化, S掺杂的HTiNbO₅纳米片可以达到41%矿化率, 而HTiNbO₅纳米片上矿化单几乎为零. 这说明S掺杂能有效改善纳米片的光催化效果. 最后, 对可能的光催化机理进行了探讨.

S-doped HTiNbO5 nanosheets：A novel efficient visible-light photocatalyst

S-doped HTiNbO₅ nanosheets were prepared via an exfoliation-flocculation-calcination process using layered HTiNbO₅ as the starting material and thiourea as the S source. The resulting catalyst had higher surface area and visible-light absorption than did unexfoliated HTiNbO₅ or HTiNbO₅ nanosheets. The adsorption and photodegradation of rhodamine B were evaluated under visible-light irradiation on the obtained catalysts. Both HTiNbO₅ nanosheets and S-doped HTiNbO₅ nanosheets showed enhanced adsorption capacity and a high visible-light photodegradation rate. However, a much higher degree of mineralization (41%) was achieved using the S-doped HTiNbO₅ nanosheets, compared with almost no mineralization for the HTiNbO₅ nanosheets, indicating that S doping can effectively improve the photocatalytic activity of nanosheets. The possible photodegradation mechanisms are also discussed.