TiO2-碳纳米管复合材料的制备和光催化性能

Preparation and Photocatalytic Activity of TiO2-Carbon Nanotube Composites

以多壁碳纳米管(MWCNT)为载体,四氯化钛为前驱体,经常压水解获得了TiO2/MWCNT纳米复合材料,对纳米复合材料的晶相组成、形貌和微结构等进行了表征,测试了在酸性、中性、碱性3种体系下复合材料对甲醇的电催化氧化性能。结果表明:复合材料的晶相由锐钛矿、金红石和MWCNT组成,锐钛矿和金红石均匀地分布于MWCNT的外表面,且复合材料中锐钛矿和金红石的含量和分布与制备过程中钛与碳的质量比有关;TiO2与MWCNT复合后,复合材料对甲醇的电催化氧化性能显著提高,且其性能与TiO2在MWCNT外表面的含量和分布密切相关。方法:采用常压水解法制备了TiO2/MWCNT纳米复合材料,对纳米复合材料的晶相构成、外观等进行了表征,测试了在不同pH条件下复合材料对甲醇的电催化氧化性能。结果:TiO2-碳纳米管复合材料对甲醇的电催化氧化性能显著提高,且其性能与TiO2在MWCNT外表面的含量和分布密切相关。

Multi-walled carbon nanotubes(MWCNTs)were used as carriers,titanium tetrachloride was used as precursor,and TiO2/MWCNT nanocomposites were obtained by pressure hydrolysis.The crystal phase composition,morphology and microstructure of nanocomposites were investigated.Characterization and testing of the electrocatalytic oxidation performance of the composites on methanol in acid,medium and alkali systems.The results show that the crystal phase of the composite consists of anatase,rutile and MWCNT.The anatase and rutile are evenly distributed on the outer surface of MWCNT,and the content and distribution of anatase and rutile in the composite are in the process of preparation.Titanium is related to the mass ratio of carbon.After TiO2 is combined with MWCNT,the electrocatalytic oxidation performance of the composite is significantly improved,and its performance is closely related to the content and distribution of TiO2 on the outer surface of MWCNT.Methods:The TiO2/MWCNT nanocomposites were prepared by atmospheric pressure hydrolysis.The crystal phase composition and appearance of the nanocomposites were characterized.The electrocatalytic oxidation properties of the composites to methanol under different pH conditions were tested.RESULTS:The electrocatalytic oxidation performance of TiO2-carbon nanotube composites for methanol was significantly improved,and its performance was closely related to the content and distribution of TiO2 on the outer surface of MWCNT.