胶体碳球制备新型Sn/Se共掺杂TiO_(2)及其光催化性能

Preparation of Novel Sn/Se Codoped TiO_(2)by Colloidal Carbon Spheres and Their Photocatalytic Properties

TiO_(2)的光催化性能改性是水污染治理和光催化领域研究的重点方向。为了增强TiO_(2)的光催化性能,以胶体碳球为模板,采用水热-煅烧法首次制备了TiO_(2)空心球、硒掺杂二氧化钛(Se-TiO_(2))空心球和锡/硒共掺杂二氧化钛(Sn/Se-TiO_(2))空心球。同时,对Sn/Se-TiO_(2)空心球的形貌、结构以及元素组成进行了表征,并以罗丹明B为模拟污染物,评价了样品的光催化性能。结果表明:TiO_(2)为单一的锐钛矿相,Sn和Se成功地掺杂进入了TiO_(2)晶格中;Sn/Se共掺杂形成了缺陷能级,降低了禁带宽度和电子-空穴对的复合几率,提高了可见光的响应范围。当Se掺杂2.0%(物质的量分数,下同),Sn掺杂0.5%时,样品光催化性能最好,去除率为76.92%。同等条件下空心球的光催化去除率:TiO_(2)<Se-TiO_(2)<Sn/Se-TiO_(2),说明Sn/Se共掺杂TiO_(2)空心球成功提高了TiO_(2)的光催化性能。

In this paper,TiO_(2)hollow spheres,Se-doped TiO_(2)hollow spheres and Sn/Se-doped TiO_(2)hollow spheres were prepared by hydrothermal-calcination method using colloidal carbon spheres as templates,in order to enhance the photocatalytic performance of TiO_(2).At the same time,the morphology,structure and elemental composition of Sn/Se-TiO_(2)hollow spheres were characterized.The photocatalytic performance of the samples was evaluated by using Rhodamine B as a simulated pollutant.The results show that TiO_(2)is a single anatase phase,and Sn and Se are successfully doped into the TiO_(2)lattice.The Sn/Se co-doping results in the formation of defect levels,decreases the band gap width and the recombination probability of electron-hole pairs,and improves the response range of visible light.When the Se doping amount is 2.0%and the Sn doping amount is 0.5%,the photocatalytic performance of the sample is the best,and the removal rate is 76.92%.Under the same conditions,the photocatalytic efficiency of hollow spheres is as follows:TiO_(2)<Se-TiO_(2)<Sn/Se-TiO_(2).The results indicated that the photocatalytic performance of TiO_(2)was improved by Sn/Se codoped hollow spheres.