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中文摘要：
用高温固相法制备Ta^5＋掺杂的K2-xLa2Ti3-xTaxO10（x=0．1—1．0）系列层状钙钛矿，用XRD，UV—VIS和BET等方法对样品进行表征，研究了钽取代钛对层状钙钛矿镧钛酸钾光催化性能的影响．结果表明，掺杂，Ta降低了半导体颗粒能隙，拓展了光响应范围，提高了光催化活性．随着Ta掺杂量的增加，少量，Ta团聚覆盖在材料颗粒表面，x增至0．8时发生相转变，导致光催化活性下降．结果表明，K1.9La2Ti2．9Ta0.1O10具有最佳光催化活性．
英文摘要：
K2-xLa2Ti3-xTaxO10 （x=0.1-1.0） were synthesized by high temperature solid state method and characterized by XRD, UV-VIS and BET. The influence of substitution of Ta^5＋ for Ti^4＋ in K2La2Ti3O10 with a layered perovskite structure had been studied on the photocatalytic decomposition of water under UV light irradiation. Both the optical property and photocatalytic activity of K2-xLa2Ti3-xTaxO10 are varied by the substitution of Ta for Ti. As Ta content increased the band gap and light response range are changed, which have a positive effect on the photocatalytic activity in the water splitting reaction. However, a little amount of Ta covers the surface of particle with increase of Ta content, and the phase transfer from Ruddlesden-Popper to Dion-Jacobson is found when x up to 0.8, which result in lowering the photocatalytic activity. As a result, the highest activity is obtained for K1.9La2Ti2.9Ta0.1O10.
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