酸法纳米纤维素模板剂合成介孔TiO_2及光催化活性  

Synthesis and Photocatalytic Activity of Mesoporous TiO_2 Using Nano-Cellulose Template Prepared by Acid Method

作　　者：陈孝云[1] 陆东芳[2] 陈彦[1] 谭非[1] 

机构地区：[1]福建农林大学材料工程学院,福州350002 [2]福建农林大学园林学院,福州350002

出　　处：《无机化学学报》2013年第3期528-536,共9页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.31000269);福建省高等学校杰出青年科研人才培育计划(No.JA11072);福建省教育厅基金(No.JA00121)资助项目

摘　　要：以生物可再生资源的酸法纳米纤维素为模板剂,四氯化钛为钛源,采用液相水解-沉淀法制备了具有介孔结构的TiO2光催化剂。采用低温N2物理吸附-脱附、透射电镜(TEM)、X射线衍射(XRD)、热重-量热扫描(TG/DSC)、傅里叶变换红外(FTIR)、X射线光电子能谱(XPS)等对介孔TiO2进行了表征,并以甲基橙为模型物,考察了介孔TiO2光催化活性。结果表明,以酸法纳米纤维素为模板剂合成的TiO2光催化活性显著提高,且具有良好的孔隙结构,平均孔径5.03 nm、总孔容积0.35 cm3.g-1、比表面积192m2.g-1;纤维素模板剂合成的TiO2表面羟基数量降低;纤维素长链分子结构之间的羟基与TiO2表面羟基的键合,可有效限制TiO2前驱体的生长和团聚,并抑制锐钛矿相TiO2向金红石相转变。Mesoporous TiO2 was synthesized by a hydrolysis-precipitation method using a renewable biological resource of nano-cellulose as the template and TiCl4 as the precursor. The photocatalytic activity of TiO2 was evaluated using the degradation of methyl orange under ultraviolet light irradiation as a model reaction. N2 adsorption- desorption, transmission electron microscopy （TEM）, X-ray diffraction （XRD）, thermogravimetry-differential Scanning Calorimetry （TG/DSC）, fourier transform infrared spectroscopy （FTIR） and X-ray photoelectron spectroscopy （XPS） were used for catalyst characterization. The results show that TiO2 synthesized with acid nano-cellulose template exhibits high activity under UV irradiation. The material exhibits mesoporous structure with specific area of 192 m^2·g^-1, average pore size of 5.03 nm, and pore volume of 0.35 cm^3·g^-1. The addition of acid nano-cellulose template can reduce the amount of surface OH-of TiO2, hydroxyl groups of long-chain cellulose and surface hydroxyl groups of TiO2 bonding can inhibit the TiO2 precursor growth and aggregation, and inhibit the phase transformation from anatase to rutile.

关 键 词：二氧化钛 纳米纤维素 模板剂 介孔 光催化 

分 类 号：O643[理学—物理化学]