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以纳米微晶纤维素为模板的酸催化水解法制备球形介孔TiO_2
引用本文:李伟,赵莹,刘守新. 以纳米微晶纤维素为模板的酸催化水解法制备球形介孔TiO_2[J]. 催化学报, 2012, 0(2): 342-347
作者姓名:李伟  赵莹  刘守新
作者单位:东北林业大学生物质材料教育部重点实验室
基金项目:国家自然科学基金(31170545);高等学校博士学科点专项科研基金(20100062110003);东北林业大学优秀博士学位论文培育计划(Grap09)~~
摘    要:以纳米微晶纤维素(NCC)为模板剂,采用酸催化水解法制备了球形介孔TiO2(SP-TiO2).并采用扫描电镜、透射电镜、X射线衍射、紫外-可见漫反射光谱和低温N2吸附-脱附等手段对其进行了表征.结果表明,所制SP-TiO2为直径100~200nm的规整球形颗粒,单个球形颗粒由粒径为10~20nm的TiO2小晶粒组成.其介孔孔径为8.2~13.5nm,且随焙烧温度的升高而增大.NCC长链结构之间羟基键合所形成的狭小空间构成的微反应器,可有效限制TiO2前驱体的生长和团聚,诱导其晶粒自组装成球形结构,并抑制由锐钛矿相向金红石相转变.600oC焙烧的SP-TiO2表现出最高的光催化活性,对苯酚降解率达89%.

关 键 词:球形  介孔  二氧化钛  纳米微晶纤维素  模板  水解

Mesoporous TiO2 Spheres Prepared by an Acid Catalyzed Hydrolysis Method Using Nanocrystalline Cellulose as Template
LI Wei,ZHAO Ying,LIU Shouxin. Mesoporous TiO2 Spheres Prepared by an Acid Catalyzed Hydrolysis Method Using Nanocrystalline Cellulose as Template[J]. Chinese Journal of Catalysis, 2012, 0(2): 342-347
Authors:LI Wei  ZHAO Ying  LIU Shouxin
Affiliation:Key Laboratory of Bio-based Material Science and Technology of Ministry of Education,Northeast Forestry University,Harbin 150040,Heilongjiang,China
Abstract:Mesoporous nanosize TiO2 spheres(SP-TiO2) were prepared using natural polymer nanocrystalline cellulose(NCC) as template.Scanning electron microscopy,transmission electron microscopy,X-ray diffraction,ultraviolet-visible diffuse reflection spectroscopy,and N2 adsorption-desorption were used for the characterization of the SP-TiO2 photocatalyst.The results showed that SP-TiO2 was uniform in size with a diameter of 100-200 nm.SP-TiO2 was composed of smaller crystal particles(10-20 nm).The average mesoporous pore diameter of SP-TiO2 was 8.2-13.5 nm,which increased with increasing calcination temperature.A nano-scale reactor that was formed by bonding between the hydroxyl groups of NCC long-chain can inhibit the growth and aggregation of the TiO2 precursor,promote its self-assembly into spherical structure,and inhibit the phase transformation from anatase to rutile.SP-TiO2 prepared at 600 oC exhibited the highest activity with the phenol degradation percentage of 89%.
Keywords:sphere  mesopore  titania  nanocrystalline cellulose  template  hydrolysis
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