OPTIMIZATION OF ADSORPTION CONDITIONS FOR NI(II)-REMEDIATION FROM POLLUTED WATER USING A SUCCINATE-FUNCTIONALIZED ADSORBENT

Abstract

Hydrogels are the hydrophilic biomaterials with three-dimensional structure. Their chemical structures can be modified owing to the presence of chemically modifiable functional groups such as carboxylic (--COOH) and hydroxyl (-OH). Consequently in the present study, an acetylated hydrogel from the seeds of Salvia spinosa (SH) was extracted, succinylated and saponified to synthesize an eco-friendly polysaccharide based ion-exchanger (Na-SH) for developing a cost effective sorbent medium towards Ni(II) retrieval from water polluted. The influence of five parameters namely sorbent dose (10-90 mg/100 mL), initial Ni(II) ion concentration (10-250 mg L⁻¹), duration of contact time (5-150 min), temperature (298-338 K) and pH (1-7) on the adsorption capacity was investigated. Considerable amount of Ni(II) was removed using Na-SH adsorbent. The maximum  Ni(II) uptake was found at sorbent dosage = 20 mg/100 mL, initial concentration Ni(II) ions= 100 mgL⁻¹, contact time = 30 min, temperature = 298 K, and pH value of 6. Thus, these conditions were selected as best one for the remediation of Ni(II) from polluted water.