ACADSTAFF UGM
| Title | : | POINT OF ZERO CHARGE (PZC) KULIT BUAH KELENGKENG (Dimocarpus longan) TERMODIFIKASI ASAM SULFAT DAN APLIKASINYA PADA ADSORPSI Au(III) |
| Author | : |
Mokhammad Fajar Pradipta, S.Si.,M.Eng. (1) Prof. Dr. Bambang Setiaji (2) |
| Date | : | 0 2016 |
| Keyword | : | longan peel modified sulfuric acid,adsorption,Au(III) longan peel modified sulfuric acid,adsorption,Au(III) |
| Abstract | : | Strongly selective adsorbability of the longan peel (Dimocarpus longan) modified sulfuric acid toward gold ions from aqueous solutions has been discovered and successfully optimized by facilely controlling pH value, and Au(III) ion concentration. This research was begun with the preparation of longan peel treated with concentrated sulfuric acid for 24 hours and temperature 1000 oC. Dry solid obtained treated with concentrated sulfuric acid was used to determine the point of zero charges by Potentiometric Mass Titrations method. Determination of pH adsorption was done by mixing longan peel modified sulfuric acid with a solution of Au(III) 20 ppm on pH variation 1, 2, 3, 4, 5, 6, and 7. Adsorption capacity was determined by the interaction of longan peel modified sulfuric acid with varying concentration of standard solutions Au(III). The concentrations were characterized by FTIR, XRD, and SEM. The results shows that a point of zero charges of longan peel modified sulfuric acid located in pH 1.3. The result of optimum pH adsorption of Au(III) was at pH 1. Adsorption of Au(III) with longan peel modified sulfuric acid was tended to follow Langmuir equation, and the value of adsorption capacity (max) obtained was 55.56 mg/g. FTIR analysis results showed that the longan peel modified sulfuric acid has several functional groups including –OH phenol, C-C aromatic, and ethers. Analysis with XRD showed amorphous structure of longan peel modified sulfuric acid before interaction, however the result of interaction with Au(III) shows 4 peaks characteristic of gold metal on 2?= 37,610, 43.770, 64,050, dan 77,020 that indicating longan peel modified sulfuric acid had been reduced from Au(III) to Au(0). |
| Group of Knowledge | : | |
| Level | : | Internasional |
| Status | : |
Published
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