Removal of an anionic dye, Orange G from aqueous solutions by adsorption on unmodified sheesham (Dalbergia sisso) saw dust
| Main Authors: | Sushmita Banerjee, Vriddhi Nigam, Ravindra Kumar Gautam, Sudeep Halder, M. C. Chattopadhyaya |
|---|---|
| Format: | Article Journal |
| Bahasa: | eng |
| Terbitan: |
, 2013
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/5771362 |
Daftar Isi:
- Environmental Chemistry Research Laboratory, Department of Chemistry, University of Allahabad, Allahabad-211 002, Uttar Pradesh, India E-mail : mcc46@rediffmail.com, sushbanerjee9@gmail.com Manuscript received online 19 April 2012, revised 22 June 2012, accepted 25 June 2012 Removal of an anionic dye, Orange G from its aqueous solutions by adsorption on raw (unmodified) saw dust was investigated. The effect of contact time and initial concentration, temperature, and pH on the removal of the selected dye was studied. Equilibrium was achieved in 50 min. A higher removal (%) was achieved in lower concentration ranges. A maximum removal of the dye (63.2%) was achieved at pH 1.0. The process of dye removal follows pseudo-second order kinetics and the value of rate constant was found to be 5.99 min.g/mg at 298 K. The equilibrium modeling of the adsorption process was carried out and the data fitted better in Freundlich isotherm model. The negative values of Gibb's free energy (∆G0) showed spontaneity of the adsorption process. The negative value of enthalpy change (∆H0) confirmed the exothermic nature of the process. The process can be recommended for the removal of dye from coloured effluents.