Abstract
Sorbent orange peel based materials activated using NaOH and H3PO4 were prepared and evaluated in order to compare sorbent efficiency, and related to their physicochemical properties. Results of physicochemical characterization demonstrated there are significant changes on surface that promotes an adsorption behavior depending on the activation method. FTIR analysis shows decreasing signal of water at 3422 cm−1 of water, hemicellulose and pectin due to activation process, another decreasing signal is observed at at 1626 cm−1 for CC bond, while an increasing pick is observed at 1435 cm−1 which corresponds to methoxyl groups belonging to cellulosic compounds. Analysis of sorption equilibrium indicated 78 % of methyl orange sorption in orange dry peel (OP) which was sorbed after 5 hour, compared to 84 % and 98 % using 0.1 M activated sorbent material 2(AM2) and 0.6 M activated sorbent material 3 (AM3) H3PO4 respectively, this process was carried out during the first 90 min of sorption process. NaOH activated sorbent material 1 (AM1) promoted 20 % to 65 % sorption. orange dry peel (OP), activated sorbent material 2 (AM2) and activated sorbent material 3 (AM3) obeyed a pseudo-second order kinetic model, while activated sorbent material 1 (AM1) obeys a pseudo-first order model. Sorption equilibrium of methyl orange resulted as follows, orange dry peel (OP) followed a Freundlich equilibrium model, activated sorbent material 1 (AM1) a Langmuir model, while activated sorbent material 2 (AM2) and activated sorbent material 3 (AM3) to Hill model. Activated sorbent materials with H3PO4 showed 750–770 mg/g of methyl orange which represent high sorption capacities. Orange peel sorbent material previously activated with H3PO4 represents a good alternative to reduce water pollution, and also residues of orange peel could be reduced by this alternative treatment.
Sustainable Sorbent Materials Obtained from Orange Peel as an Alternative for Water Treatment
