PENERAPAN FREUNDLICH MODEL PADA ADSORPSI-REDUKTIF ISOTHERM AUCL4ï DENGAN ASAM
DOI:
10.29303/jpm.v10i2.24Published:
2015-09-01Issue:
Vol. 10 No. 2 (2015): SeptemberArticles
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Abstract
Abstrak: Telah dilakukan adsorpsi reduktif isotherm AuCl4ï dengan menggunakan asam humat hasil isolasi tanah gambut Rawa Pening, Ambarawa. Isolasi dilakukan melalui perendaman alam 0,1 M NaOH dan dilanjutkan dengan pemurnian menggunakan 0,1 M HCl/0,3 M HF. Asam humat hasil isolasi dikarakterisasi menggunakan spektroskopi inframerah, ditentukan kadar abunya dan diaplikasikan untuk adsorpsi reduksi isotherm larutan AuCl4ï. Hasil karakterisasi menunjukkan bahwa asam humat hasil isolasi memiliki gugus ââ¬âCOOH, -OH fenolik, hidrokarbon alifatik dan aromatis dengan kadar abu sebesar 1,13%. Data adsorpsi AuCl4ï àdengan menggunakan asam humat lebih menunjukkan kecocokan dengan persamaan Freundlich di banding Langmuir, dengan harga R=0,92, n=1,7184 dan log KF= 4,1707. Reduksi Au(III) menjadi Au(0) oleh asam humat dikonfirmasi dengan munculnya puncak tajam baru dengan nilai 2ø =38, 44, 64 dan 77ð yang merupakan puncak karakteristik dari partikel emas.
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Kata kunci: adsorpsi reduktif isotherm, AuCl4ï, asam humat, Freundlich.àààààààààààààààààààààààààààààààààààààààààààààààààààààààààààààààààààààààààààààààààÃÂ
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Abstract: Isotherm adsorption reductive of AuCl4ï by using isolated humic acid of Rawa Pening peat soil, Ambarawa had been conducted. Isolation was done by soaking peat soil in 0.1 M NaOH and following by purification in 0.1M HCl/0.3 HF. The isolated humic acid was characterized using infrared spectroscopy, determined its ash contain and aplicated for isotherm adsorption reductive of AuCl4ï. FTIR spectra indicated that isolated humic acid consist of COOH group, phenolic ââ¬âOH, aliphatic hydrocarbon and aromatic ring, its ash content was 1.13%. Asorption data of AuCl4ïàshowed more suitable for Freundlich model than Langmuir model, with R=0,92, n=1,7184 and log KF= 4,1707. Reduction of Au(III) to Au(0) was confirmed by appearance of sharp peak at 2ø = 38, 44, 64 dan 77ð as characteristic peak of gold particles.
Keywords: Isotherm adsorption reductive, AuCl4ï , humic acid, Freundlich.
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