Wsw. Ngah et Kh. Liang, Adsorption of gold(III) ions onto chitosan and N-carboxymethyl chitosan: Equilibrium studies, IND ENG RES, 38(4), 1999, pp. 1411-1414
The adsorption of gold(III) ions onto chitosan and N-carboxymethyl chitosan
(NCMC) has been investigated. Experiments were carried out as a function o
f pH, agitation period, and concentration of Au3+ ions. It was shown that t
he adsorption of Au3+ ions occurred only at the optimum pH. Kinetic studies
showed a rapid adsorption of Au3+ from aqueous solution. Adsorption isothe
rmal data could be interpreted by the Langmuir equation. Langmuir constants
have been determined. The experimental data of the adsorption equilibrium
from Au3+ solutions correlated well with the Langmuir isotherm equation. Th
e uptake of Au3+ On chitosan and NCMC were 30.95 mg/g of chitosan and 33.90
mg/g of NCMC. The Au3+ ions were readily removed from chitosan and NCMC by
treatment with an aqueous EDTA solution.