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Vol. 28 No. 6 (2016): Vol 28 Issue 6

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Effect of Electrolyte on Adsorption Behaviour on Graphene

https://doi.org/10.14233/ajchem.2016.19702
Ali Issa Ismail
Department of Chemistry, Rabigh College of Science and Arts, King Abdulaziz University, P.O. Box 344, Rabigh, Saudi Arabia

Corresponding Author(s) : Ali Issa Ismail

aeyesmaeel@kau.edu.sa; pchem.ismail@gmail.com

Asian Journal of Chemistry, Vol. 28 No. 6 (2016): Vol 28 Issue 6

Abstract

The effect of matrix on the adsorption of p-nitrophenol on graphene was studied. Six different salts (NaCl, CH3COONa, Na2SO4, NaBr, NaSCN and Na2CO3) were added to the aqueous adsorption mixture with three different concentrations. The results showed the existence of four classifications for the salt effect on adsorption; adsorption promoters, adsorption inhibitors, salt independence and concentration dependence adsorption. Acetate and carbonate ions are considered as concentration dependent adsorption salt; high concentration of acetate inhibits the adsorption ability of graphene toward p-nitrophenol where high concentration carbonate shows an increase in the adsorption capacity. The effect will reverse at high concentration of acetate ion and carbonation. The results also showed that the adsorption of p-nitrophenol is highly sensitive to the medium acidity which controls the reversible phenol phenolate equilibrium. The ratio between the adsorption at highly acidic and highly basic media reaches more than 90 %. The adsorption isotherms for high concentration of sulfate solution, fitted by Langmuir and Freundlich models, showed an order of magnitude increase in the maximum adsorption capacity parameters as compared to the adsorption in pure aqueous medium.

Keywords

4-Nitrophenol Sulfate Acetate Carbonate Acidity Graphene
Ismail, A. I. (2016). Effect of Electrolyte on Adsorption Behaviour on Graphene. Asian Journal of Chemistry, 28(6), 1347–1350. https://doi.org/10.14233/ajchem.2016.19702
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