用高温固相法制备Ta5+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.
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