Solvothermal Preparation of Nanocrystalline TiO2 Using Alcohol-water Mixed Solvent

알코올-물 혼합용액을 이용하는 Solvothermal 법에 의한 나노크기의 TiO2 제조

  • Lee, Sang Geun (Department of Industrial Chemistry, Pukyong National University) ;
  • Park, Seong Soo (Department of Industrial Chemistry, Pukyong National University) ;
  • Hong, Seong Soo (Department of Chemical Engineering, Pukyong National University) ;
  • Park, Jong Myung (Graduate Institute of Ferrous Technology, Pohang University of Science and Technology) ;
  • Lee, Seung Ho (Composite Materials Center, Korea Institute of Ceramic Engineering & Technology) ;
  • Kim, Dae Sung (Composite Materials Center, Korea Institute of Ceramic Engineering & Technology) ;
  • Lee, Gun Dae (Department of Industrial Chemistry, Pukyong National University)
  • 이상근 (부경대학교 공업화학과) ;
  • 박성수 (부경대학교 공업화학과) ;
  • 홍성수 (부경대학교 화학공학과) ;
  • 박종명 (포항공과대학 철강대학원) ;
  • 이승호 (한국세라믹 기술원 복합재료센터) ;
  • 김대성 (한국세라믹 기술원 복합재료센터) ;
  • 이근대 (부경대학교 공업화학과)
  • Received : 2011.09.20
  • Accepted : 2011.10.23
  • Published : 2011.12.10

Abstract

In this study, a solvothermal reaction to prepare nanocrystalline titania was carried out using $TiCl_4$ and mixed solvents of alcohol and water. The effects of the type and the composition of alcohol on the crystal structure and agglomeration of final $TiO_2$ products were investigated. The products were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) as well as scanning electron microscopy (SEM). In the solvothermal reaction using the n-butanol solutions with different volume ratios of n-butanol/water (100/0, 75/25, 50/50, 25/75, 0/100), the extent of agglomeration of obtained rutile $TiO_2$ was found to change with the volume ratio of n-butanol/water, and the n-butanol/water ratio of 75/25 revealed the best result for the preparation of well-dispersed nanocrystalline $TiO_2$ powders. The crystal phase of $TiO_2$ prepared through the solvothermal reaction changed with the type of alcohol in solvent (alcohol/water = 75/25). $TiO_2$ products obtained with the aqueous solutions of methanol, ethanol and isopropanol have an anatase phase, while that with n-butanol has a rutile phase. The results showed that, in the solvothermal reaction using both $TiCl_4$ as a starting material and the alcohol-water mixed solvents without any other additive, the enhancement of dispersion and control of crystal structure of $TiO_2$ products can be feasible by simply varying the composition and type of alcohol in the mixed solvents.

Keywords

solvothermal;mixed solvent;alcohol-water;titania

Acknowledgement

Supported by : 지식경제부

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