title: The mechanisms of Ni2+ ions sorption by AlPO4.
abstract: Sorption of Ni2+ ions by AlPO4 is studied as a function of concentrations and temperature at pH 7. Potentiometric titration, dissolution and FTIR studies are employed to determine the mechanism of the process of the uptake of Ni2+ ions which is found to be both the ion exchange and the surface precipitation of the corresponding metal phosphates. Freundlich equation is found applicable to the sorption data, and is employed to evaluate the thermodynamic parameters deltaH(o) and deltatS(o).
authors.affiliation: National Centre For Excellence in Physical Chemistry, Peshawar University, Peshawar-25120, Pakistan.
authors.forename: S
authors.initials: S
authors.lastname: Mustafa
authors.forename: M
authors.initials: M
authors.lastname: Javid
authors.forename: M I
authors.initials: MI
authors.lastname: Zaman
authors.forename: R
authors.initials: R
authors.lastname: Gul
authors.forename: H
authors.initials: H
authors.lastname: Ali
mesh_terms: D000327:Adsorption; D017607:Aluminum Compounds / Q000737:chemistry*; D011232:Chemical Precipitation; D007477:Ions; D009532:Nickel / Q000737:chemistry*; D010710:Phosphates / Q000737:chemistry*; D012995:Solubility; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature
chemical_list: D017607:Aluminum Compounds; D007477:Ions; D010710:Phosphates; D009532:Nickel; C012714:aluminum phosphate