采用溶胶-凝胶、质子交换和层状剥离的方法,制备出金红石TiO2纳米片.利用X射线电子衍射谱(XRD)、透射电子显微镜(TEM)、紫外-可见吸收光谱(UV-Vis)、X光电子能谱(xPS)的价带谱和荧光光谱(PL)等对样品进行了表征,研究了光生载流子的转移过程.结果证明:金红石TiO2纳米片具有较大的比表面积(185.7 m2/g),厚度约5 nm,与金红石TiO2样品相比,金红石TiO2纳米片的禁带宽度增加,氧化还原能力增强;此外,纳米片结构能够促使光生载流子快速转移到纳米片的表面并产生有效分离,阻止了光生电子和空穴的复合,提高了光催化反应中光生载流子的利用率.金红石纳米片的这些特性导致其具有较高的光催化活性,紫外光催化降解对氯苯酚的实验表明:金红石TiO2纳米片的光催化活性高于金红石TiO2和锐钛矿TiO2样品.
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