ADSORPTION OF GIBBERELLIC ACID ONTO NATURAL KAOLIN FROM TATAKAN, SOUTH KALIMANTAN Adsorpsi Asam Giberelin pada Kaolin Alam asal Tatakan, Kalimantan Selatan
ABSTRACT Adsorption of gibberellic acid (GA3Jonto raw and purified kaolin from Tatakan, South Kalimantan was investigated in this study. Purification process was done by sedimentation to obtain relative pure kaolinite. Raw and purified kaolin samples were characterized by Fourier transformed infrare...
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| Format: | Article NonPeerReviewed |
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[Yogyakarta] : Universitas Gadjah Mada
2009
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| Online Access: | https://repository.ugm.ac.id/28023/ http://i-lib.ugm.ac.id/jurnal/download.php?dataId=11086 |
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| Summary: | ABSTRACT
Adsorption of gibberellic acid (GA3Jonto raw and purified kaolin from Tatakan, South Kalimantan was
investigated in this study. Purification process was done by sedimentation to obtain relative pure kaolinite. Raw and
purified kaolin samples were characterized by Fourier transformed infrared (FTIR) spectroscopy and X-ray
diffractometer (XRD). The adsorption process was ca"ied ouf in a batch system and the effect of pH, contact time
and GA3 concentration were experimentally studied to evaluate the adsorption capacity. The amount of GA3
adsorbed was determined by UV spectrophotometer. The result showed that the raw kaolin from South Kalimantan
consist of 53.36% kaolinite, 29.47% halloysite, 4.47% chlorite, 11.32% quartz and 1.38% christobalite and the
purified kaolin consist of 73.03% kaolinite, 22.6% halloysite, 0.77% chlorite, 1.37% quartz and 2.23% christobalite
Adsorption experimental indicate that the optimum adsorption took place at pH 7 and contact time for 4 h. Adsorption
of GA3was described by the Langmuir adsorption isotherm model with adsorption capacity of 8.91 mg/g on raw
kaolin and 10.38mg/g on purified kaolin.
Keywords: kaolin, gibberellic acid, adsorption |
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