The use of raw shrimp shells in the adsorption of highly polluted waters with Co2+

Abstract

In this study, whether raw shrimp shell (Shr-S), which is included in the waste material category, can be used to remove cobalt (Co2+), which is among the heavy metals with a high toxicological risk level, from aqueous environments and the effect of this material on the treatment process were examined. To be able to understand the effect of Shr-S use as an adsorbent on Co(2+ )adsorption, the effects of pH levels (2.0-7.0), Shr-S dose (0.5-5.0 g), and contact time (5-120 min) were examined throughout the adsorption. At optimum conditions for Shr-S (dose: 1 g/L, pH: 5.26, time: 10 min), the Co2+ removal efficiency was found to be about 75 %. The surface structure of Shr-S was revealed by FTIR and SEM-EDX analyses. Equilibrium and speed control were determined using four different isotherm and kinetic models. It was found to be more appropriate for the pseudo-second-order kinetic and Langmuir, whose correlation coefficients (R-2) were 0.9966 and 0.9567, and the maximum capacity was calculated as 7.692 mg/g. Results of this study revealed that in terms of removal of Co(2+ )from aqueous environments, Shr-S can be used as an effective adsorbent and its adsorption capacity is comparable to other adsorbents studied in the literature. (C) 2022 Institution of Chemical Engineers. Published by Elsevier Ltd. All rights reserved.