Journal of Polymers and the Environment

, Volume 26, Issue 7, pp 2901–2916 | Cite as

Removal of Oil from Water by Calcium Alginate Hydrogel Modified with Maleic Anhydride

  • Asma Eskhan
  • Fawzi Banat
Original Paper


Calcium alginate hydrogel was prepared and used as a biosorbent for the removal of oil from aqueous solutions. Calcium alginate hydrogel was further chemically modified by esterification with maleic anhydride. The changes in the physicochemical properties of maleic anhydride modified calcium alginate were investigated via multiple techniques (FTIR, SEM, BET and DSC/TGA). Adsorption batch experiments were carried out to compare the oil adsorption capacities of native and modified calcium alginates. Adsorption experiments were carried out as a function of solution pH, temperature and ionic strength to determine the optimal conditions for the adsorption of oil. Equilibrium and kinetic studies were conducted for the modified alginate. Results revealed that the maleic anhydride modification of calcium alginate improved its adsorption capacity towards oil. Higher adsorption capacities of modified alginate were attained at lower temperatures (20 °C), higher ionic strengths (1.0 M NaCl) and within the pH range of 5–9. The oil adsorption data obtained for modified alginate could be better described by the first order kinetic model (R2 = 0.981) and the BET equilibrium isotherm (R2 = 0.984). The maximum monolayer adsorption capacity predicted by the BET model for the modified calcium alginate was found to be 143.0 mg/g.


Adsorption Crude oil Alginate Maleic anhydride Esterification 



This work was supported by The Petroleum Institute Research Center, Abu Dhabi, UAE [Grant number LTR14013].


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Chemical EngineeringKhalifa University of Science and Technology, The Petroleum InstituteAbu DhabiUAE

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