The ELECTRICAL INTERFACIAL LAYER at theTiO2(ANATASE)/ELECTROLYTE INTERFACE - ADSORPTION of Zn(II) and Cd(II) IONS
作者:
W. Janusz,
J. Jabloński,
R. Sprycha,
期刊:
Journal of Dispersion Science and Technology
(Taylor Available online 2000)
卷期:
Volume 21,
issue 6
页码: 739-759
ISSN:0193-2691
年代: 2000
DOI:10.1080/01932690008913306
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Mechanism of adsorption of Zn(II) and Cd(II) ions at the TiO2(anatase)/electrolyte interface has been studied by different experimental techniques (potentiometric titration, microelectrophoresis and adsorption measurements of zinc and cadmium species). It was found that the point of zero charge (pzc) of anatase (pH =5.8) was shifted to the lower pH values with increasing concentrations of Zn(II) or Cd(Il) ions. The surface charge of anatase in the presence of Zn(II) and Cd(II) for pH > pHpzcwas higher than that observed for original sample in NaClO4solutions only. Due to low coverage of anatase surface with Zn(II) or Cd(II) species almost no shift of the isoelectric point (iep) or charge reversal were observed. Adsorption density vs. pH plots for both Zn(Il) or Cd(II) showed, typical for multivalent ions, presence of “adsorption edge.”
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