Abstract
In this study, we valorize the use of Ensis siliqua shell powder (ESSP) as a biosorbent to remove Cu(II), Zn(II) and Ni(II) ion from aqueous solutions. A batch scale experiment for different mass doses of biosorbent in different concentrations of metalions was carried out. The sorption characteristic of the biosorbent was studied under various experimental conditions, such as pH, contact time, biosorbent amount on adsorption and concentration of the heavy metalions studied. The optimum pH for maximum uptake of copper, zinc and nickel was pH 4. Results indicate that the removal efficiency for copper, zinc and nickel was about 99.67 %, 99.20 % and 99.96 % respectively. The modeling kinetics of the three pollutants studied revealed that it conformed to a pseudo second-order model. Experimental results were applied to Freundlich, Langmuir, Dubinin-Radushkevich, Elovich and Temkin models. The adsorption model obeys the first version of Langmuir’s and Freundlich’s equation. This eco-friendly and low cost biosorbent successfully and favorably removed heavy metalions from synthetic wastewater solution and could be used to treat real industrial wastewater.
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