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.
- Heavy metals
- Perovskite related structure
ASJC Scopus subject areas
- Environmental Engineering
- Environmental Chemistry
- Waste Management and Disposal
- Health, Toxicology and Mutagenesis