A novel magnetic biosorbent prepared using an oak shell waste material as an efficient adsorbent for consecutive removal of Pb2+, Ag+, Ba2+, Sr2+, and CrO42− from aqueous solutions

Abstract

In this research, the performance of a new biosorbent prepared using low-cost oak shell waste materials for consecutive removal of particular cations and chromate anions from aqueous solutions was studied. The adsorbent impregnated with Pb 2þ , Ag þ , Ba 2þ , and Sr 2þ was used to remove chromate anions by the formation of an appropriate insoluble precipitate. The biosorbent was characterized by FTIR, XRD, SEM, TG-DTG, and VSM techniques. The adsorption capacities of 133.84, 53.12, 50.12, and 40.39 mg g À1 were obtained for chromate for the samples containing Pb 2þ , Ag þ , Ba 2þ , and Sr 2þ cations, respectively. The chromate uptake was inversely proportional to the k sp of the chromate precipitate and increased with the cation content of the adsorbent. The adsorption process was kinetically fast and the equilibrium was established within 10 min. The experimental data were analyzed by the Langmuir, Freundlich, Sips, and Redlich-Peterson isotherm models. The data were fitted to the Langmuir isotherm, indicating that chromate was adsorbed homogeneously on the adsorbent surface.

Insight on water remediation application using magnetic nanomaterials and biosorbents

“…This is due to their availability, renewable nature, and low cost [53][54][55]. Some examples of waste biomass sources used in such an application are: rice bran [56], wheat bran [57], sawdust [58], groundnut husk [59], walnut shell [60], switchgrass grass [61], Bacillus laterosporus [62], pine sawdust [63], oak shell [64], and pine cone [65]. The results have shown that these adsorbents have been highly efficient in water treatment.…”