@phdthesis{digilib57068,
           month = {July},
           title = {APLIKASI ASAM HUMAT TANAH GAMBUT RAWA PENING UNTUK ADSORPSI-REDUKSI Au(III)},
          school = {UIN SUNAN KALIJAGA YOGYAKARTA},
          author = {NIM.: 06630020 Nur Mazidah},
            year = {2011},
            note = {Pembimbing: Sri Sudiono, M.Si},
        keywords = {Asam Humat, Reduksi, Adsorpsi, AuCl4},
             url = {https://digilib.uin-suka.ac.id/id/eprint/57068/},
        abstract = {Application of Rawa Pening peat soil humic acid for adsorption-reduction
of Au(III) have been investigated. The purpose of this researched is to know the
ability of humic acid to adsorption and reduction of Au(III).
This research was started by purification of humic acid with HCl/HF
solution. The purified humic acid was characterized by FTIR spectroscopy, ash
content, total acidity, -COOH content, and ?OH content, then applied for
adsorption reduction of Au(III).The Effect of pH adsorption, adsorption kinetics,
and adsorption isotherm on adsorption reduction process of Au (III) also were
studied. The gold metal formed was confirmed by IR spectra and photo optical
microscope..
The result showed that purified humic acid has 11,32\% ash content, total
acidity of 685 cmol/kg, -COOH content of 237 cmol/kg, and -OH fenolaic content
of 448 cmol/kg. The adsorption-reduction of Au(III) ion on humic acid was
maximum at pH 3. KF value of adsorption Au(III) on humic acid determined
according to Freundlich isotherm model were 21,42 mg/g, adsorption energy
7,644 kJ/mol {\ensuremath{<}} 10 kJ/mol (physisorption) and the adsorption rate constant (k)
determined according to Santosa kinetic model for humic acid are 0.002 min-1,
respectively}
}