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|Title:||Adsorption of chromium(VI) ion onto activated amla dust: Adsorption isotherms and kinetics|
Juliet, Joseph C
|Abstract:||The adsorption efficiency of a low cost adsorbent, amla dust (Indian gooseberry, Emblica Officinalis) in removing chromium(VI) ion from aqueous solution has been investigated in batch experiments. The effects of hexavalent chromium concentration, particle size, adsorbent dosage, temperature and pH have been studied. Removal is found to be most effective at pH 4 and at the low temperature and Cr(VI) ion concentration. Therefore, the uptake capacity has been investigated in buffered solutions of pH 4 maintaining a constant ionic strength with 0.01 M NaClO4. The batch adsorption isotherms have been studied in terms of Langmuir and Freundlich isotherm models. Adsorption of Cr(VI) on amla dust is found to follow first order kinetics. The mechanism of Cr(VI) removal on the adsorbent is complex and both the surface adsorption as well as intraparticle diffusion contribute to the rate determining step. Amla dust, the low cost adsorbent is found to be efficient in the removal of Cr(VI) ion in acidic medium, hence, the development of such materials can be applied for the removal of metal ions from industrial waste waters.|
|Appears in Collections:|| IJC-A Vol.43A(01) [January 2004]|
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