摘要
以棉纤维素为模板,钛酸四丁酯为前驱体,无水乙醇为溶剂,通过表面溶胶-凝胶法和火焰燃烧的方法制备具有精细纤维素形貌的锐钛矿型二氧化钛和碳(TiO_2@C)的复合光催化材料。研究了磷酸二氢铵处理对TiO_2@C光催化剂的光催化性能的影响,分析了钛酸四丁酯与无水乙醇的体积比、沉积次数以及沉积后棉布的煅烧时间对TiO_2@C光催化剂性能的影响,通过测试棉纤维素基TiO_2@C光催化剂对染料的吸附降解性能,对TiO_2@C光催化剂的制备工艺进行优化。采用红外光谱、X射线衍射、扫描电镜、透射电镜等方法对棉纤维素基TiO_2@C光催化剂进行结构和形貌分析。优化制备工艺为:采用质量分数为20%的磷酸二氢铵溶液浸渍棉布20h,钛酸四丁酯与无水乙醇体积比为1∶1的溶液抽滤沉积、水解、烘干,反复沉积10次,空气中煅烧150min得到棉纤维素基TiO_2@C光催化剂。棉纤维在沉积钛酸四丁酯前利用磷酸二氢铵浸渍,起到了催化纤维素成炭的作用,一定程度阻碍了二氧化钛晶粒的凝聚。
TiO_2@C composite catalyst was prepared via a surface sol-gel method and flame burning,using cotton cellulose as a template,tetrabutyl titanate as a precursor,anhydrous ethanol as a solvent.Flameproof treatment of cellulose was performed using a flame retardant of ammonium dihydrogen phosphate to catalyze the carbon formation of cellulose.The effect of ammonium dihydrogen phosphate on photocatalytic performance of TiO_2@C photocatalyst was discussed.The effect of volume ratio of tetrabutyltitanate and ethanol,deposition times and calcination time after deposition on photocatalytic performance of TiO_2@C was analyzed.The optimum preparation process of cotton cellulose-based TiO_2@C photocatalyst was obtained through analyzing the properties of adsorption and degradation of dye molecules.The structure and morphology of TiO_2@C photocatalyst were characterized by infrared spectroscopy,X ray diffraction,scanning electron microscopy and transmission electron microscopy. The optimum preparation process of cotton cellulose based TiO_2@C catalyst involved soaking in 20% NH4 H2 PO4 solution for 20 hand drying,hydrolysis of tetrabutyl titanate and anhydrous ethanol volume ratio of 1∶1 solution,depositing 10 times via filtration and calcining in air for 150 min.The results indicate that the soaking ammonium dihydrogen phosphate plays a role in catalyzing the formation of cellulose into the cotton fiber before deposition in tetrabutyl titanate,hindering the condensation of titanium dioxide grains in a certain extent.
出处
《大连工业大学学报》
CAS
北大核心
2018年第1期44-48,共5页
Journal of Dalian Polytechnic University
