Structural and electrosurface characteristics of titanium dioxide xerogel prepared by the sol–gel method
- 作者: Kobulei O.P.1, Strelko V.V.1, Psareva T.S.1, Barany S.2,3
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隶属关系:
- Institute of Sorption and Endoecology Problems
- MTA-ME Materials Science Research Group and Institute of Chemistry
- Ferenc Rácöczi II Transcarpathian Hungarian Institute
- 期: 卷 78, 编号 2 (2016)
- 页面: 164-169
- 栏目: Article
- URL: https://journals.rcsi.science/1061-933X/article/view/200243
- DOI: https://doi.org/10.1134/S1061933X16020058
- ID: 200243
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详细
Stable highly concentrated TiO2 sol has been synthesized using binary titanyl ammonium sulfate monohydrate, (NH4)2TiO(SO4)2 · H2O. Treatment of the sol with an ammonia solution has yielded a stable hydrogel, which, after being dried, is transformed into a TiO2 xerogel. Study of the structure-related sorption and crystalline-chemical properties of the synthesized xerogel has shown that it represents a semicrystalline micro/mesoporous material with a rather developed specific surface area (Ssp = 120 m2/g). According to potentiometric titration data, the point of zero charge (PZC) of this material is located at pH 3.9. Measurements of the electrophoretic mobility (by microelectrophoresis) of TiO2 xerogel particles in solutions of HCl, NaOH, and salts of mono-, bi-, and trivalent cations have shown that (1) the isoelectric point (IEP) of the particles lies in the vicinity of pH 6.2, i.e., at a much higher pH than that for PZC; (2) the presence of increasing amounts of 1: 1 and 2: 1 electrolytes causes a gradual and a dramatic reduction in the ζ potential of the particles, respectively; and (3), in the presence of an electrolyte with a trivalent counterion, the surface charge is reversed. The behavior of TiO2 xerogel in an electric field is similar to that of lyophobic particles, with the difference that there is no maximum in the ζ potential versus 1: 1 electrolyte concentration dependence and the measured IEP of the xerogel is much higher than its PZC. Possible reasons for this discrepancy have been discussed.
作者简介
O. Kobulei
Institute of Sorption and Endoecology Problems
编辑信件的主要联系方式.
Email: akmbsab@uni-misckolc.hu
乌克兰, ul. Generala Naumova 13, Kyiv, 03164
V. Strelko
Institute of Sorption and Endoecology Problems
Email: akmbsab@uni-misckolc.hu
乌克兰, ul. Generala Naumova 13, Kyiv, 03164
T. Psareva
Institute of Sorption and Endoecology Problems
Email: akmbsab@uni-misckolc.hu
乌克兰, ul. Generala Naumova 13, Kyiv, 03164
S. Barany
MTA-ME Materials Science Research Group and Institute of Chemistry; Ferenc Rácöczi II Transcarpathian Hungarian Institute
Email: akmbsab@uni-misckolc.hu
匈牙利, Miskolc-Egyetemváros, 3515; Beregovo
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