Response surface modeling of Orange-G adsorption onto surface tuned ragi husk
| Autor: | Sibin Antony, Kripa K. Nair, Basil Wilson, Vinu V. Dev, K. Anoop Krishnan |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Exothermic reaction
Materials science Formaldehyde Aqueous two-phase system Langmuir adsorption model 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Husk 0104 chemical sciences Surfaces Coatings and Films symbols.namesake chemistry.chemical_compound Colloid and Surface Chemistry Adsorption chemistry Chemical engineering Materials Chemistry symbols Orange G Physical and Theoretical Chemistry Fourier transform infrared spectroscopy 0210 nano-technology Biotechnology |
| Zdroj: | Colloid and Interface Science Communications. 41:100363 |
| ISSN: | 2215-0382 |
| DOI: | 10.1016/j.colcom.2021.100363 |
| Popis: | The paper describes a sustainable way of approach in limiting the dye pollution in surface water systems. An active formaldehyde modified ragi husk (FMRh), a bio adsorbent, was prepared and effectively adopted for the adsorption of Orange-G from aqueous phase. The adsorption data were evaluated using response surface model and created an ideal statistical validation of the significant interactive variables such as pH to 4.8 and contact time to 99.0 min for achieving 100% removal of Orange-G. The kinetic and equilibrium data suited with pseudo-second-order and Langmuir isotherm model with an adsorption capacity of 14.6 mg/g. The ΔG0 and ΔH0 values were − 36.1 and − 282.1 kJ /mol, respectively and confirms the spontaneous and exothermic behaviour of the dye adsorption. The FTIR and SEM analysis of FMRh (before and after adsorption) confirms the changes attributed to Orange-G uptake. The kinetically driven adsorptive mechanism holds the dye within the FMRh active-centers. |
| Databáze: | OpenAIRE |
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