STUDI KAPASITAS ADSORPSI-REDUKSI ION Au(III) PADA ASAM HUMAT HASIL ISOLASI DARI TANAH GAMBUT RAWA PENING

Abstract

Isolation of peat soil humic acid and its application for adsorption-reduction of Au(III) have been conducted. Humic acid was isolated from peat soil that was collected from Rawa Pening, Central Java. Isolation of humic acid from peat soil was based on conventional alkaline extraction. Humic acid was extracted from peat soil with NaOH 0.1 M, then precipitated with 0.1 M HCl, and purified with 0.1 M HCl/0.3 M HF 1/1. The isolated humic acid was characterized by FTIR spectroscopy, then applied for adsorption reduction of Au(III). Isothermic adsorption capacity on adsorption reduction process of Au (III) also were studied. The gold metal formed was confirmed by XRD diffractogram, and photo optical microscope. The adsorption capacity with Langmuir isothermic model for humic acid was 192 mg/g. Peaks of gold particles in the difractogram are 2 = 38, 44, and 64.

Keywords

• humic acid
• Au(III)
• adsorption
• reduction
• adsorption capacity
• adsorption isotherm