Ni2+ and H2PO4- uptake properties of compounds in the CaTiO3-CaFeO2.5 system

Catalin Popa, Yoshikazu Kameshima, Toshihiro Isobe, Akira Nakajima, Kiyoshi Okada

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A batch method was used to investigate the uptake of heavy metal cations and anions by the compounds in the CaTiO3-CaFeO2.5 system, in which a series of oxygen vacancies was systematically introduced into a perovskite structure as the x-value of Ca(FexTi1-x)O3-x/2 was increased. Samples of CaTiO3, CaFe0.1Ti0.9O2.95, CaFe0.5Ti0.5O2.75, CaFe0.67Ti0.33O2.67 and CaFeO2.5 were prepared by solid mixing (SM), co-precipitation (CP) and gel evaporation (GE) methods. The resulting samples were calcined at temperatures between 400 and 1000°C. The target crystalline phases differed according to the preparation method, but in most cases were formed at 700-800°C. The Ni2+ sorption isotherms of all the samples were fitted better by the Langmuir model than by the Freundlich model, while in the case of H2PO4- sorption isotherms, these were better fitted by the latter model. The uptake ability increased with increasing x value of the samples. The maximum values for the saturated sorption of Ni2+ (Q0(Ni2+)=2.83mmol/g) and H2PO4- (KF(H2PO4-)=2.95mmol/g) were achieved for x=1 (i.e. CaFeO2.5) sample.

Original languageEnglish
Pages (from-to)1390-1397
Number of pages8
JournalJournal of Hazardous Materials
Volume185
Issue number2-3
DOIs
Publication statusPublished - Jan 30 2011
Externally publishedYes

Fingerprint

Sorption
sorption
Isotherms
isotherm
perovskite
Oxygen vacancies
Coprecipitation
Heavy Metals
Perovskite
Heavy metals
Anions
Cations
anion
Evaporation
Negative ions
Gels
gel
evaporation
cation
Positive ions

Keywords

  • CaFeO
  • CaTiO
  • Heavy metals
  • Perovskite related structure
  • Uptake

ASJC Scopus subject areas

  • Health, Toxicology and Mutagenesis
  • Pollution
  • Waste Management and Disposal
  • Environmental Chemistry
  • Environmental Engineering

Cite this

Ni2+ and H2PO4- uptake properties of compounds in the CaTiO3-CaFeO2.5 system. / Popa, Catalin; Kameshima, Yoshikazu; Isobe, Toshihiro; Nakajima, Akira; Okada, Kiyoshi.

In: Journal of Hazardous Materials, Vol. 185, No. 2-3, 30.01.2011, p. 1390-1397.

Research output: Contribution to journalArticle

Popa, Catalin ; Kameshima, Yoshikazu ; Isobe, Toshihiro ; Nakajima, Akira ; Okada, Kiyoshi. / Ni2+ and H2PO4- uptake properties of compounds in the CaTiO3-CaFeO2.5 system. In: Journal of Hazardous Materials. 2011 ; Vol. 185, No. 2-3. pp. 1390-1397.
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