Biosorption analysis of cd(Ii) from industrial wastewater using endophytic bacterium agrobacterium tumefacians 12b3 by kinetic modeling and equilibrium studies

Abstract

Heavy metal pollution from industrial wastewater is a significant problem that can be solved through remediation. The present study investigated the adsorption capability of endophytic bacterium Agrobacterium tumefacians 12b3 from the hyper accumulator plant Oxalis corniculata against Cd(II). Fourier transform infrared (FT-IR) technique was used for the surface characterization of the biosorbent and scanning electron microscopy (SEM) was applied to detect the change in biosorbent for adsorption of Cd(II) ions. Different factors such as pH, contact time and initial metal concentration for the adsorption of Cd(II) was studied in detail. Cd(II) was quantitatively adsorbed at pH 6 with optimum contact time of 30 min and adsorption increased as the concentration increased from 10 to 150 mg L–1. The results were in accordance with Pseudo-second-order kinetic and Langmuir isothermal model with maximum capacity of 56.17 mg g–1 of cadmium. The present study demonstrated that A. tumefaciansis quite efficient in adsorption of cadmium (II) and can open a new door in the field of remediation of heavy metals form industrial wastewater.