Efficient Cd (II) Ions Removal from Aqueous Solution Using Peganum Harmala and Prosopis Farcta Seed as Adsorbents Service Unavailable

Cadmium is a highly toxic heavy metal and a dangerous pollutant to the environment. Anthropogenic activities are the main reasons for diffusing cadmium into water resources, soil, and air. In this study, the adsorption of cadmium from the aqueous phase has been investigated by the usage of biological adsorbents including Prosopis farcta and Peganum harmala seeds powder. The adsorption procedure was optimized in four steps: initial pH, contact time, adsorbent dosage, and initial concentration of cadmium. The cadmium concentration in solution was measured by the Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES) method. The results of optimization tests showed ۹۱% and ۷۳% Cd (II) removal for pH = ۶.۵ and initial metal concentration of ۲۰ mg/L for ۲۰ g/L of Prosopis farcta at ۴۵ min and ۴۰ g/L of Peganum harmala at ۳۰ min, respectively. In addition, the efficiency of the adsorption process improved when the cadmium concentration decreased in the initial solution. Finally, the adsorption process for both adsorbents complied with Freundlich isotherm and the pseudo-second-order kinetic.Cadmium is a highly toxic heavy metal and a dangerous pollutant to the environment. Anthropogenic activities are the main reasons for diffusing cadmium into water resources, soil, and air. In this study, the adsorption of cadmium from the aqueous phase has been investigated by the usage of biological adsorbents including Prosopis farcta and Peganum harmala seeds powder. The adsorption procedure was optimized in four steps: initial pH, contact time, adsorbent dosage, and initial concentration of cadmium. The cadmium concentration in solution was measured by the Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES) method. The results of optimization tests showed ۹۱% and ۷۳% Cd (II) removal for pH = ۶.۵ and initial metal concentration of ۲۰ mg/L for ۲۰ g/L of Prosopis farcta at ۴۵ min and ۴۰ g/L of Peganum harmala at ۳۰ min, respectively. In addition, the efficiency of the adsorption process improved when the cadmium concentration decreased in the initial solution. Finally, the adsorption process for both adsorbents complied with Freundlich isotherm and the pseudo-second-order kinetic.

کلیدواژه ها:

Adsorption ، Cadmium contamination ، Prosopis farcta ، Peganum harmala ، Isotherm ، Kinetic models