二氧化钛纳米管/硅气凝胶复合材料制备及其光吸收性能研究  

Preparation and spectral absorption of titanium oxide nanotubes/silica aerogel composites

作　　者：李红伟[1] 曹亚华[1] 饶欣远 张海岳[1] Li Hongwei Cao Yahua Rao Xinyuan Zhang Haiyue(School of Materials Science and Engineering, Chang＇an University, Xi＇an 710064, China)

机构地区：[1]长安大学材料科学与工程学院,陕西西安710064

出　　处：《无机盐工业》2017年第5期78-81,85,共5页Inorganic Chemicals Industry

摘　　要：为了提高一维钛纳米管(TNTs)的催化效率,将水热合成的TNTs均匀分散在不同氧化硅的前驱体溶胶中,经快速凝胶,二氧化碳超临界干燥后制成复合粉体,最终TNTs被原位钉扎在包含大量纳米孔结构的二氧化硅气凝胶网络结构中。通过FE-SEM、EDS、BET等表征了粉体的微观形貌和结构,采用紫外-可见光漫反射研究了复合粉体的紫外-可见光光谱的吸收现象。结果表明:复合材料遗传了二氧化硅气凝胶的介孔结构形貌,比表面积高达600 g/m^2,但平均孔径略有增加;水热合成的TNTs的吸收光谱较P25出现蓝移,具有更宽的光响应区间,可达到可见光区;而复合材料的吸收光谱较TNTs进一步出现蓝移,且其在可见光区的吸光度也有所提高。In order to improve the photo-catalytic efficiency of one-dimensional titanium nanotubes （TNTs）,TNTs prepared by hydrothermal method was uniformly dispersed in the silica sol as the processor,rapidly formed into gel state and then manu- factured into composite powder through supercritical COz drying.Finally ,TNTs was pricked into nano-network structure of silica aerogel by in-situ pinning.Through the means of FE-SEM,EDS, and BET etc.,the microcosmic appearance and structure of the powder were characterized.UV-VIS absorption phenomenon of the composite powder was studied by adopting ultraviolet- visible diffuse reflection.Results showed that the composite powder has inherited mesoporous structure of silica aerogels with specific surface area being up to 600 g/m2,but the average pore size increased slightly;compared with P25 the absorption spec- trometry of the hydrothermal synthetic TNTs showed blue shift and had a wider spectral response area which can have access to the visible light spectrum.What＇s more, composite materials showed wider blue shift and stronger absorbance than TNTs.

关 键 词：二氧化钛纳米管 二氧化硅气凝胶 光谱吸收 

分 类 号：TQ134.11[化学工程—无机化工]