Application of organic waste for adsorption of Zn(II) and Cd(II) ions

Abstract

Biosorption of Zn(II) and Cd(II) ions from aqueous solutions onto organic waste-orange peel, hazelnut shell, and walnut shell was studied using batch adsorption experiments. In the biosorption studies, equilibrium metal ion concentration was determined. Experimental data obtained were analysed in terms of Freundlich, Langmuir, Temkin, Dubinin-Radushkevich, Redlich-Peterson, Sips, Toth, and Khan isotherms. The results of the study showed that orange peel, hazelnut shell, and walnut shell can be adequately used as low-cost alternatives for the removal of Zn(II) and Cd(II) ions from aqueous solutions with maximum sorption capacities of 15.51 and 19.8 mg/g, 11.55 and 16.65 mg/g, and 26.60 and 21.10 mg/g, respectively. The highest removal efficiency of Zn(II) and Cd(II) ions was obtained for hazelnut shells. The process was fast and about 90% of metal ions were removed by all the studied biosorbents. The sorption process was possibly chemisorption occurring on a heterogeneous surface.

Recent advances in the use of walnut (Juglans regia L.) shell as a valuable plant-based bio-sorbent for the removal of hazardous materials

“…In addition, Zn 2+ and Cd 2+ ion biosorption from aqueous solution to organic wastes such as orange peel, hazelnut shell, and WS were investigated using batch adsorption studies. 95 Hazelnut shells had the highest removal efficiency for Zn 2+ and Cd 2+ ions. The method was reported to be quick and all the studied biosorbents were capable of removing 90% of HM ions.…”

Characterization of Cu(II) and Zn(II) Sorption onto Zeolite

“…Copper ions (Cu) and zinc ions (Zn) removal from aqueous solutions is widely studied. Different methods have been developed for the removal of Cu and Zn [4] including methods such as precipitation [5,6], membrane separation [7][8][9], coagulation and flocculation [10,11], biosorption [12][13][14], ion-exchange [13,15], adsorption [16][17][18], combined processes [19], etc. Sorption is considered as one of the promising methods to remove Cu and Zn from wastewater for easy application and recyclability of the sorbents [20,21].…”