Open AccessSpecific Adsorption of Aspartic Acid on Iron (III) and Nickel (II) Oxides
Author(s) -
И. Б. Дмитриева,
Alexander S. Chukhno,
Ekaterina Yu . Rodionova,
R. V. Novichkov
Publication year - 2012
Publication title -
eurasian chemico-technological journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.227
H-Index - 9
eISSN - 2522-4867
pISSN - 1562-3920
DOI - 10.18321/ectj126
Subject(s) - aspartic acid , chemistry , adsorption , inorganic chemistry , isoelectric point , potentiometric titration , nuclear chemistry , base (topology) , ion , amino acid , organic chemistry , biochemistry , mathematical analysis , mathematics , enzyme
The dependences of zeta – potential and adsorption of aspartic acid on NiO and Fe 2 O 3 oxideswere investigated as a function of aspartic acid concentration, pH and adsorption time using microelectrophoresis and potentiometric titration methods. Shifting of pHIEP (the isoelectric point or IEP) towards the acid zone for Fe 2 O 3 and towards the base zone for NiO in the solutions of aspartic acid in comparison with HCl shows the presence of specific adsorption of aspartic acid anion and cation forms on the surfaces of Fe 2 O 3 and NiO oxides, respectively. The complexation process of Fe(III) ions with aspartic acid in the bulk solution and on the oxide surface was examined by spectrophotometer. It was determined that Fe(III) ions form complexes with aspartic acid in the bulk solution.