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活性炭载体对TiO2/活性炭中二氧化钛晶粒生长及相变的影响
引用本文:李佑稷,李效东,李君文,尹静,冯春祥. 活性炭载体对TiO2/活性炭中二氧化钛晶粒生长及相变的影响[J]. 无机材料学报, 2005, 20(2): 291-298
作者姓名:李佑稷  李效东  李君文  尹静  冯春祥
作者单位:1. 吉首大学化学化工学院,吉首,416000;国防科技大学CFC国防科技重点实验室,长沙,410073
2. 国防科技大学CFC国防科技重点实验室,长沙,410073
3. 军事医学科学院卫生学环境医学研究所,天津,300050
基金项目:军事医学科学院创新基金
摘    要:以活性炭为载体,采用溶胶-凝胶法制备了TiO2/活性炭(TiO2/AC)复合体,并利用SEM和XRD手段对复合体进行表征,通过Dt2=ktnexp(-E/RT)方程的计算,分析,研究活性炭对复合体中TiO2晶粒生长及其相变的影响.结果表明TiO2/AC复合体晶粒粒径增长的时间比TiO2本体短;TiO2/AC复合体纳米粒子平均尺寸为50nm比TiO2本体小;锐钛矿向金红石转变的相变温度和晶粒生长最快温度TiO2/AC复合体比TiO2本体高.锐钛矿和金红石晶粒生长的表观活化能TiO2/AC复合体分别为6.21±1.27和46.54±1.56kJ/mol,TiO2本体分别为5.764±1.02和36.4±1.14kJ/mol.在锐钛矿阶段和金红石阶段TiO2/AC复合体反应指数分别为0.19和0.35,而TiO2本体分别为0.13和0.26.原因是活性炭的强吸附力和非晶相层对TiO2晶粒生长的阻遏作用.

关 键 词:TiO2/活性炭 晶粒生长 相变 表观活化能
文章编号:1000-324X(2005)02-0291-08
收稿时间:2004-03-22
修稿时间:2004-06-14

Effects of Active Carbon Carrier on Phase Transform and Crystallite Growth of Titanium Dioxide in TiO2/AC
LI You-Ji,LI Xiao-Dong,LI Jun-wen,YIN Jing,FENG Chun-xiang. Effects of Active Carbon Carrier on Phase Transform and Crystallite Growth of Titanium Dioxide in TiO2/AC[J]. Journal of Inorganic Materials, 2005, 20(2): 291-298
Authors:LI You-Ji  LI Xiao-Dong  LI Jun-wen  YIN Jing  FENG Chun-xiang
Affiliation:1.CollegeofChemistryandChemosynthesisofJishouUniversity;Jishou416000;China;2.KeyLabofSchoolofAerospaceandMaterialsEngineering;NationalUnversityofDefenceTechnology;Changsha410073,China;3.InstituteofHygieneandEnvironmentalMedicine;AcademyofMilitaryMedicalScience;Tianjin300050;China
Abstract:TiO2-bonded active carbon (TiO2/AC) composites were prepared via a sol-gel dip-bonding process by a carrier of active carbon. The as-prepared composites were characterized by scanning electrical microscope (SEM) and X-ray diffraction (XRD). The effects of active carbon on crystallite growth and phase transform of TiO2 in composites were studied by calculating and analysing the formula: Dt2=ktn{ exp(-E/RT). The results show that, comparing with TiO2 powders, the time of crystallite growth of the composite is shorter, and the composite has an average particle size of 50nm, smaller than that ot TiO2 powder. Temperature of crystalline phase transform from anatase to rutile and temperature of crystallite-rapidity growth for the composites are higher than that for TiO2 powder. The activation energies E(anatase) and E(rutile) are respectively 6.21±1.27kJ/mol and 46.5±1.56kJ/mol for the composites, while they are respectively 5.76±1.02kJ/mol and 36.4±1.14kJ/mol for TiO2 powder. The reaction exponent n(anatase) and n(rutile) are respectively 0.19 and 0.35 for the composites and 0.13 and 0.26 for TiO2 powder. Above narrated differences between composites and TiO2 powder attribute to the fact that the great adsorbability and no-crystalline layer of active carbon retard TiO2 crystallite growth.
Keywords:TiO2-bonded active carbon  crystallite growth  phase transform  apparent activation energy
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