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Abstract
The current study addresses the impact of five key operation parameters on nickel (Ni2+) ion removal in wastewater using chemically modified chia seed mucilage adsorbent. The parameters analyzed are temperature, contact time, solution pH, adsorbent dosage, and concentration of Ni(II) ion. Chemical modification has been performed on the adsorbent to increase its surface functionality, active binding sites, and overall adsorption capacity. Adsorption isotherms and kinetic models were used to analyze the results of the batch adsorption tests which were carried out to determine the impact of each parameter systematically. The results showed that the rate of Ni2+ removal was influenced by the dosage of adsorbent used, the condition of the adsorbent (the proper pH), and the duration of contact however the initial concentration of sample and the temperature influenced differently on the process of adsorption. Under ideal conditions, maximum removal efficiency was achieved, which demonstrated that the chemically modified adsorbent is more efficient than a chemically treated one. This study shows that the modified adsorbent would be an effective, cheap and acceptable material in the treatment of industrial wastewater to remove Ni2+.