多壁碳纳米管改性InVO_4光催化剂的制备及性能

Preparation and Property of Visible-light-driven InVO_4/MWCNTs Photocatalyst for Benzene Decomposition

以酸处理的多壁碳纳米管(MWCNTs)为载体,采用水热合成法制备了InVO4/MWCNTs光催化剂.利用场发射扫描电镜、X射线粉末衍射、BET-N2吸附、傅里叶红外光谱和紫外-可见漫反射吸收光谱等技术对样品的形貌、晶相组成、比表面积和吸光性能等物理性质进行了表征,并以气相的苯作为模型污染物,研究催化剂样品在可见光(λ>420 nm)照射下的光催化氧化能力.结果表明,InVO4颗粒均匀附着于MWCNTs,表面粒径约100 nm.与纯InVO4相比,InVO4/MWCNTs的比表面积和可见光吸收性能显著提高.在可见光照射下,InVO4/MWCNTs具有良好的光催化活性,反应4 h光催化降解苯的转化率和矿化率分别为41.0%和43.4%,其转化率分别是InVO4的1.5倍和掺氮TiO2的3倍,InVO4/MWCNTs光催化活性的提高与载体MWCNTs良好的电子传输特性有关.

InVO4/MWCNTs photocatalyst was synthesized by a hydrothermal method using acid-treated multi- walled carbon nanotubes （MWCNTs） as a support. The prepared InVO4/MWCNTs photocatalyst was examined by X-ray diffraction （XRD）, field emission scanning electron microscope （FE-SEM）, Brunauer-Emmett-Teller （BET） nitrogen adsorption, Fourier transform infrared spectroscopy （FTIR） and UV-Vis diffuse reflectance spectrum （UV-Vis DRS）. The photocatalytic activity of the as-prepared samples was determined by the degradation of gas-phase benzene under visible light （λ〉420 nm） irradiation. The results show that the InVO4 particles are uniformly anchored on the surface of MWCNTs with average size of 100 nm. The specific surface area and the optical absorption of InVO4/MWCNTs are remarkably improved, as compared with that of the pure InVO4. After photo- catalytic oxidation for 4h, the conversion rate of benzene over the InVO4/MWCNTs is 41.0%, which is 1.5 times as much as that of the InVO4 or 3 times greater than that of the N-doped TiO/, respectively. Simultaneously, the min- eralization rate of benzene on the InVO4/MWCNTs is 43.4%. The enhanced photocatalytic performance of the InVOa/MWCNTs is related to the excellent electron-transporting properties of the MWCNTs, which acts as a trap for photogenerated electron.