Browsing by Author "Alghamdi, Huda Saeed"

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Using of Chemically Modified Chitosan for the Sorption of some Toxic Metal Ions in Aqueous Systems
(Imam Abdulrahman Bin Faisal University, 2020) Alghamdi, Huda Saeed; Alakhras, Fadi Atef
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 about 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 modeled effectively and obeyed 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 overwhelming applied pseudo- first and second order kinetic models, the best model fitted the data was pseudo- second order rate equation suggested chemisorption might be the rate-determining step. The adsorption process was endothermic, feasible, and the positive value of ΔS indicating the high randomness at the solid/solution interface.
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