IMMOBILISASI ASAM ASKORBAT PADA Mg/Al HIDROTALSIT DAN APLIKASINYA UNTUK ADSORPSI-REDUKSI AuCl4�
| Main Authors: | , RAHMA HIDAIYANTI, , Prof. Dr. Sri Juari Santosa, M. Eng |
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| Format: | Thesis NonPeerReviewed |
| Terbitan: |
[Yogyakarta] : Universitas Gadjah Mada
, 2013
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| Subjects: | |
| Online Access: |
https://repository.ugm.ac.id/119257/ http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=59252 |
Daftar Isi:
- Immobilization of ascorbic acid on Mg/Al hydrotalcite has been conducted and applied to adsorption-reduction of AuCl4�. Mg/Al hydrotalcite has been synthesized by coprecipitation method of Mg(NO3)2 and Al(NO3)3 at pH 10 with Mg(II) and Al(III) molar ratio of 2 : 1. The synthesized Mg/Al hydrotalcite as well as its immobilization product with ascorbic acid (Mg/Al HT-AA) before and after being used to adsorption-reduction of AuCl4� were characterized by X-ray Diffraction and FT-IR Spectroscopy. The effect of pH on adsorption-reduction of AuCl4�, kinetic and isotherm adsorption were also studied. The gold metal formed was confirmed by XRD difractogram. Immobilization of ascorbic acid was optimum at pH 5 with adsorption capacity which followed Langmuir isoterm model was 90.91 mg/g. Adsorption of AuCl4� by Mg/Al HT-AA was optimum at pH 3 and followed pseudo-second order kinetic model and Langmuir isotherm model with rate constant (k) and adsorption capacity of 7.79 x 10-4 g/mg minute and 38.46 mg/g respectively. Characterization with XRD showed that Au(III) could be reduced to Au(0) with peak of gold particles in difractogram of XRD d111, d200, and d220 at 2,36