Kinetic studies on the removal of cadmium using Acacia tortilis

Abstract

In this study, the feasibility of utilizing Acacia tortilis biomass for the removal of cadmium ions was investigated. The effect of operating parameters, namely, initial pH (1-10), cadmium concentration (50-200 mg/L), biosorbent dose (0.5-4.0 g/L), and agitation speed (0-400 rpm), on the cadmium removal was investigated. Maximum removal efficiency was attained at pH 5.0, at an equilibrium time of 180 min. The maximum cadmium uptake achieved with 200 mg/L initial concentration was 36.66 mg/g. The mechanism of biosorption was analyzed using the pseudo-first-order, pseudosecond-order, and intraparticle diffusion models. The pseudo-first-order model represented the data well (R 2 > 0.993), and the maximum uptake capacity was 45.83 mg/g at 30 • C with 200 mg/L manganese concentration. Desorption studies confirmed the suitability of sulfuric acid as an eluent producing recoveries in excess of 90% for cadmium up to four cycles.

Waste management and waste conversion technologies: An introduction

“…Sivaprakash et al. (2020) published in an earlier issue, studied the potential of the powdered form of Acacia tortilis to remove cadmium from a synthetic solution, tested the effect of operating conditions on metal removal, and also carried out detailed kinetic studies. The effect of operating parameters, namely, initial pH (1.0–10.0), cadmium concentration (50–200 mg/L), biosorbent dose (0.5–4.0 g/L), and agitation speed (0–400 rpm), on the cadmium removal was investigated by the authors.…”

“…WWTPs, an evaluation and modification of the fate and treatability estimator model for the removal of PAHs in full-scale WWTPs should be carried out in future studies to address the knowledge gap in the literature Sivaprakash et al (2020). published in an earlier issue, studied the potential of the powdered form of Acacia tortilis to remove cadmium from a synthetic solution, tested the effect of operating conditions on metal removal, and also carried out detailed kinetic studies.…”