一步溶剂热法合成C掺杂介孔TiO_2可见光光催化材料

Synthesis of Carbon-doped Mesoporous TiO_2 Visible-light Photocatalytic Materials via One Pot Solvothermal Method

在无模板剂的条件下,以钛酸四丁酯为钛源,采用一步溶剂热法,在乙醇体系中合成出C掺杂TiO2球状介孔可见光光催化材料.通过X射线粉末衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、氮气吸附-脱附仪、X射线光电子能谱(XPS)、固体漫反射(UV-Vis)以及光降解罗丹明B实验等对其进行了结构表征和性能测试.实验结果表明,合成样品为锐钛矿晶型,材料表现为由纳米粒子堆积而成的大小均一的球形形貌.TiO2材料的结晶度和粒子形貌大小可以通过乙酸加入量来进行调控,这对于实际应用具有重要意义.同时,通过测试证明样品中的C原子进入TiO2晶格内部,取代了O原子的位置,窄化了TiO2内部的能带结构,从而大大提高了材料的可见光光催化活性,结果证明合成材料对污染物具有很好的吸附性能和光降解性能.

C doped TiO2 mesoporous materials with spherical morphology were synthesized via solvothermal method in ethanol, using tetrabutyl titanate（ TBOT） as the titanium source under template-free condition. The synthesized samples were characterized by XRD, SEM, TEM, N2 adsorption-desorption, XPS, UV-Vis, and photocatalytic degradation of RhB. The results indicated that, the synthesized samples were pure phase anatase TiO2 , and they had morphology of uniform size spheres with the accumulation of the nanoparticles. The crystallinity and morphology of the synthesized samples could be regulated by the volume of adding acetic acid during the synthesis process. The results showed trace of C atoms getting into TiO2 crystal lattice, replacing the position of O atoms, narrowing the band gap of TiO2 , and leading to the enhancement of visible light absorption. Photocatalytic test confirmed its excellent adsorption property and photocatalytic activity under visible light, which have very important meaning for solving environmental problems in current society.