Open AccessCation-Exchange Properties of CrPO4
Author(s) -
S. Mustafa,
Shahzad Murtaza,
Abdul Naeem,
B. Dilara,
K. Farina
Publication year - 2003
Publication title -
adsorption science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.682
H-Index - 36
eISSN - 2048-4038
pISSN - 0263-6174
DOI - 10.1260/026361703769013880
Subject(s) - chemistry , alkali metal , potentiometric titration , inorganic chemistry , deprotonation , ion exchange , chromium , metal , qualitative inorganic analysis , titration , adsorption , metal ions in aqueous solution , ion , organic chemistry
Alkali metal ion exchange (Li + , Na + and K + ) on chromium phosphate (CrPO 4 ) was studied potentiometrically as a function of temperature and metal ion concentration. The shift in the potentiometric titration curves corresponding to the exchange of alkali metal cations increased with increasing pH and concentration of the metal ions, while the opposite results were obtained by increasing the temperature of the system. The affinity of the exchanger for alkali metal ions was also found to be in the order Li + > Na + > K + . The data were employed to evaluate the apparent deprotonation constants of CrPO 4 and the corresponding thermodynamic parameters ΔH 0 , ΔS 0 and ΔG 0 .