Removal of arsenate from aqueous media by magnetic chitosan resin immobilized with molybdate oxoanions

Abstract

Chitosan was cross-linked using glutaraldehyde in the presence of magnetite. The resin obtained was chemically modified through the reaction with tetraethylenepentamine ligand. The obtained resin was loaded with Mo(VI) and investigated. The adsorption characteristics of the obtained resin toward As(V) at different experimental conditions were investigated by means of batch and column methods. The resin showed high affinity and fast kinetics for the adsorption of As(V) where an uptake value of 1.30 mmol g -1 was reported in 6 min at 25°C. Various parameters such as pH, agitation time, As(V) concentration and temperature had been studied. The kinetics and thermodynamic behavior of the adsorption reaction were defined. These data indicated an endothermic and spontaneous adsorption process and kinetically followed pseudosecond-order model, Fickian diffusion low and Elovich equation. Breakthrough curves for the removal of As(V) were studied at different flow rates and bed heights. The critical bed height for the studied resin column was found to be 0.656 cm at flow rate of 4 mL min -1 . The mechanism of interaction between As(V) and resin's active sites was discussed. Regeneration and durability of the loaded resin toward the successive cycles were also clarified.

Removal of As(III) and As(V) from water by chitosan and chitosan derivatives: a review

“…It is a key to control the interaction between the adsorbate and adsorbent (Dambies et al 2002;Chen et al 2008;Elwakeel 2014). The efficiency of MICB in As(V) removal will decrease with increasing pH between pH 5 and pH 9, while insignificant differences in As(III) removing are found at between pH 4 and pH 9 (Chen et al 2008).…”

“…Molybdenum (VI) possesses stability on the beads, which, therefore, contributes to the high content of Mo(VI) loaded on the resin. With increase of the loading amount of Mo(VI), the sorption of As(V) improves linearly (Elwakeel 2014). However, the date shows the more loading of Mo(VI), the more excess Mo(VI) are released from adsorbent due to the weak bound, the excess-loaded molybdenum (VI) involved in the remaining arsenic concentration.…”

“…Molybdenum (VI) is the weak part of integration. It, therefore, does not attract the remaining solution, which causes Mo(VI) released (Elwakeel 2014). As(V) is more easily adsorbed by MICB than As(III) due to the charged property.…”

Ionic solid-impregnated sulphate-crosslinked chitosan for effective adsorption of hexavalent chromium from effluents

“…Chitosan has gained pronounced attention in the field of biosorption that can be attributed to its chemical stability, high reactivity, excellent chelation behaviour and high selectivity towards pollutants (Elwakeel 2014;Geetha Devi et al 2012). A modification of chitosan mainly involves the free-amine group on deacetylated units and hydroxyl groups on C 3 and C 6 carbons of monomers units (Kyzas and Bikiaris 2015).…”

Isolation of naproxen from wastewater using carbon-based magnetic adsorbents

“…These magnetic nanoparticles can be used alone, and they can be used as composite, with other adsorbents, such as alumina, activated carbon, and carbon nanotubes. Elwakeel (2014) used molybdate-oxoanions-immobilized magnetic chitosan for arsenate adsorption. Namvari and Namazi (2014) were clicked graphene oxide and Fe3O4 nanoparticles together for removal of methylene blue and Congo red.…”