Huda Saeed Alghamdi

Imam Abdulrahman bin Faisal University, Dammam, Saudi Arabia

Using of Chemically Modified Chitosan for the Sorption of some Toxic Metal Ions in Aqueous Systems

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Biography

Master degree holder in physical chemistry, my interest is in the field of green chemistry for sustainability. I am passionate to learn all-new. Looking forward to gaining a Ph.D.

Abstract

In this study, a successful grafting of three different kinds of benzaldehyde derivatives namely, (3-hydroxybenzaldehyde, 2,3-Di-hydroxybenzaldehyde, and 3,5-Di-tert-butyl-2-hydroxy benzaldehyde) onto chitosan powder to obtain polymer I, II, and III, respectively. The modification allows enhancing the sorption of Co (II) and Ni (II) ions from aqueous solutions. FTIR analysis, BET isotherm, TGA data, SEM, and XRD analysis have been utilized to specify the structure of the prepared Schiff base bio-sorbents after the chemical modification and to emphasize binding between the sorbent and the two metallic ions. pH at zero charge has been also estimated for approaching the interaction mechanism with the two metallic ions. The environmental factors were evaluated using batch experiments. The sorption equilibrium data was modeled effectively and obeyed the Langmuir equation with qmax higher than 125 mg g-1 for the polymers. The uptake behavior follows Co (II) > Ni (II). Further, two kinetic models have been overwhelmingly applied pseudo-first and second-order kinetic models, the best model that fitted the data was the pseudo-second-order rate equation suggested chemisorption might be the rate-determining step. The adsorption process was endothermic, feasible, and the positive value of ?S indicated the high randomness at the solid/solution interface.