Adsorptive Removal Of Ni(Ii) And Co(Ii) From Aqueous Solution Using Succinate-Bonded Polysaccharide Isolated From Artemisia Vulgaris Seed Mucilage

Herein, we discuss Ni(II) and Co(II) uptake efficacy of a polysaccharide from Artemisia vulgaris (AVH) modified by impregnation with succinic anhydride followed by the treatment with sodium bicarbonate. The ion-exchange affinity of AVH increased significantly after its modification to sodium salt (Na-SAV). The surface charge of sorbent Na-SAV was evaluated by estimating the point of zero-charge pH, that is, pH(ZPC) and it was found to be 4.75. Sorption data fit well to Langmuir isothermal, pseudo-second-order kinetic and ion-exchange model. Sorption maxima (Q(max) in mg g(-1)) of sorbent Na-SAV evaluated from Langmuir isotherm was perceived to be 115.8 mg g(-1) for Ni(II) and 170.7 mg g(-1) for Co(II). The values of thermodynamic triplet, such as Delta G degrees, Delta S degrees, and Delta H degrees were appeared negative and revealed exothermic and spontaneous mode of sorption process. Additionally, the sorbent Na-SAV was found regenerated over five repetitive cycles without any prominent decline in sorption capacity.