COMPARATIVE STUDY ON THE ADSORPTION OF [AUCL4]– ONTO SALICYLIC ACID AND GALLIC ACID MODIFIED MAGNETITE PARTICLES
ABSTRACT: Salicylic
acid-modified magnetite (Mag-SA) and gallic acid-modified magnetite (Mag-GA)
particles were prepared by co-precipitation procedure. Characterization results
showed the interaction that occurs between the surface of magnetite with
salicylic acid (Mag-SA) and gallic acid (Mag-GA) was through hydrogen bonding.
Adsorption of [AuCl4]– onto Mag-SA and Mag-GA surfaces as a function of initial
pH, contact time, and initial concentration of the [AuCl4]– solution were
comparatively investigated. Result showed that the optimum adsorption of
[AuCl4]– onto Mag-SA or Mag-GA was found at pH 3. The adsorption process were
found to allow the pseudo-second order equation, both for Mag-SA and Mag-GA.
The parameters in isotherm adsorption equations conformed to the Langmuir and
Freundlich isotherms very well for Mag-GA, but for Mag-SA, only conformed to
the Langmuir isotherm very well. The result of this study demonstrate that the
ability Mag-GA to adsorb [AuCl4]– higher than Mag-SA.
Author: Maya Rahmayanti, Sri
Juari Santosa, Sutarno
Journal Code: jpkimiagg160102
