OPTIMASI ADSORPSI Cr(VI) PADA SILIKA GEL DARI ABU SEKAM PADI TERMODIFIKASI DIFENILKARBAZIDA (Si-DPZida)
| Main Authors: | Puspa Dewi Giri, Henny, Sudiarta, I Wayan, Raka Astiti Asih, Ida Ayu |
|---|---|
| Format: | Article application/pdf eJournal |
| Bahasa: | eng |
| Terbitan: |
Journal of Chemistry
, 2015
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| Subjects: | |
| Online Access: |
http://ojs.unud.ac.id/index.php/jchem/article/view/11758 |
Daftar Isi:
- Adsorption of chromium (VI) on silica gel modified by diphenilcarbazide (Si-DPZida) have been studied. Parameters analyzed were surface acidity by acid-base titration method, specific surface area by absorption of methylene blue method, optimum conditions of adsorption (pH, contact time), and isotherm adsorption. The results showed that Si-DPZida adsorbent has surface acidity (Kal) of 1,5996 mmol/g with the number of active sites of 9,6328 x 1020 atom/g with specific surface area of 4.4538 m2/g. The optimum adsorption process of chromium (VI) by both Si-DPZida occurred at pH 5 and 15 minutes of contact time. The isotherm adsorptions on both adsorbents tend to follow Freundlich adsorption pattern.