Synthesis and characterization of chicken eggshell powder coated magnetic nano adsorbent by an ultrasonic bath assisted co-precipitation for Cr(VI) removal from its aqueous mixture

Abstract

Chromium (VI) is one of the noxious heavy metals present in the effluents that pose a threat to the living environment. In this exploration, a magnetic nano sorbent was set up by nourishment squander chicken eggshell powder coated with iron oxide in co-precipitation assisted with an ultrasonic bath. The efficacy of CM magnetic nano adsorbent in Cr(VI) removal from its aqueous solution by batch adsorption was investigated. The characterizations indicate that the CM adsorbent was of cubic shape, uniformity in distribution with less agglomeration. The higher crystalline nature and the average particle size of 24 nm were characterized and the magnetization value of 14.46 emu g−1. An endeavor has been made to intend the batch sorption of Cr(VI) by CM magnetic adsorbent embracing Box-Behnken design strategy in response surface methodology (RSM). The most extreme Cr(VI) removal of 92.87 % was acquired at the initial Cr(VI) concentration of 94.5 mg L−1, the contact time of 66.2 min and the solution pH value of 5.5, and mechanical shaking of 200 rpm. The adsorption data for Cr(VI) onto CM adsorbent were well fitted with Langmuir isotherm and pursues the pseudo-second-order kinetics. The materialness of CM adsorbent to expel Cr(VI) from real water such as tested water, surface water, underground water, and tannery gushing water. The proficient recovery CM nano adsorbent was explored through group adsorption-desorption cyclic investigations. The profoundly crystalline CM nanoparticles have been demonstrated to be a promising adsorbent for Cr(VI) redemption from its aqueous mixture.