SINTESIS MAGNETIT TERMODIFIKASI ASAM GALAT (Fe –AG) DENGAN METODE KOPRESIPITASI–SONOKIMIA UNTUK ADSORPSI–REDUKSI [AuCl4]

ASTUTI PAWENI, NIM. 09630016 (2014) SINTESIS MAGNETIT TERMODIFIKASI ASAM GALAT (Fe –AG) DENGAN METODE KOPRESIPITASI–SONOKIMIA UNTUK ADSORPSI–REDUKSI [AuCl4]. Skripsi thesis, UIN SUNAN KALIJAGA.

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Abstract

Magnetite synthesis modificated by gallic acid (Fe –GA) using sonochemistry–coprecipitation method assisted by ultrasonic wave with 200 kHz frequency has been synthesized. Synthesized process has been accomplished in one step. This study is intended to develop environmental-friendly adsorbent, i.e magnetite synthesis modificated by gallic acid, as the adsorbent for gold recovery. 3 Product of synthesized was caracterized using Fourier Transformation Infra Red (FTIR) and X-Ray Diffraction (XRD). Application of Fe –GA was used to adsorp [AuCl 4 ] - . Influence of pH, term of interaction and adsorption isotherm on adsorption-reduction process [AuCl 4 ] - were studied. The gold adsorbed on Fe 3 O –GA was confirmed using stereo microscop optic. The result of the study shows that Fe 4 3 O 4 O 4 3 O –GA on the adsorption [AuCl is optimum at pH 3, and the term to raise the adsorption balance is 15 minutes. Meanwhile, the appropriate model of isotherm to be absorbed on Fe –GA is Langmuir isotherm model with maximum capacity of adsorption was 0,00042 mol.g -1 , Langmuir constanta value adsorbed [AuCl 4 ] - on Fe 3 O -GA is 476190,47 L.mol -1 and energy of adsorption is 32,934 kJ.mol -1 4 .

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