Effects of pH on the Structure of Titania Prepared via Ionic Liquid-assisted Hydrothermal Method

doi:10.3724/SP.J.1077.2014.13229

Journal of Inorganic Materials ›› 2014, Vol. 29 ›› Issue (2): 131-136.DOI: 10.3724/SP.J.1077.2014.13229

• Research Paper • Previous Articles Next Articles

Effects of pH on the Structure of Titania Prepared via Ionic Liquid-assisted Hydrothermal Method

WANG Kai¹, ZHANG Li-Juan¹, XU Zhi-Jian¹, QI Bin¹, DI Lan-Bo¹, ZHANG Xiu-Ling^1,2

(1. College of Physical Science and Technology, Dalian University, Dalian 116622, China; 2. Liaoning key Laboratory of Bio-organic chemistry, Dalian University, Dalian 116622, China)

Received:2013-04-24 Revised:2013-05-27 Published:2014-02-20 Online:2014-01-17
About author:WANG Kai. E-mail:wangkai04@126.com
Supported by:
National Natural Science Foundation of China (21173028); Program for Liaoning Excellent Talents in University (LR2012042)

Abstract

Abstract: The mesoporous anatase TiO₂ material was prepared by ionic liquid-assisted hydrothermal method using tetrabutyl titanate as titanium source and ionic liquid 1-butyl-3-methylimida-zolium tetrafluoroborate ([C₄MIM]BF₄) as template. The pH values of the starting suspensions were adjusted from 1 to 11 using HCl or NH₃·H₂O solution. The influence of pH on the ionic liquid-water system for the preparation of titanium dioxide was investigated. The obtained TiO₂ samples were characterized with X-ray diffraction (XRD) and N₂ adsorption-desorption measurements, respectively. The results showed that the addition of ionic liquid inhibited the formation of the brookite TiO₂, and increasing pH values enhanced the crystallization. When the pH was changed at a wide range (pH=1~9), the pore size distributions of the samples were relatively narrow, and the average pore diameter was reduced from 6.6 nm to 5.0 nm by increasing pH value. At the same time, the average size of the TiO₂ nanoparticles in the samples was controlled at about 9 nm by using ionic liquid-assisted hydrothermal method. This is consistent with the results of the transmission electron microscopy (TEM) analyses.

Key words: hydrothermal method, ionic liquid, pH, mesoporous titania

CLC Number:

O649

WANG Kai, ZHANG Li-Juan, XU Zhi-Jian, QI Bin, DI Lan-Bo, ZHANG Xiu-Ling. Effects of pH on the Structure of Titania Prepared via Ionic Liquid-assisted Hydrothermal Method[J]. Journal of Inorganic Materials, 2014, 29(2): 131-136.

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Effects of pH on the Structure of Titania Prepared via Ionic Liquid-assisted Hydrothermal Method

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