Efficient Removal of Heavy Metals from Aqueous Solutions Using a Bionanocomposite of Eggshell/Ag-Fe

Verónica M Alamillo-López,Raúl A Morales-Luckie,Oscar F Olea-Mejía,Víctor Sánchez-Mendieta,María G González-Pedroza

doi:10.3390/catal10070727

Verónica M Alamillo-López, Raúl A Morales-Luckie + Show 3 more

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https://doi.org/10.3390/catal10070727

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Journal: Catalysts	Publication Date: Jun 30, 2020
Citations: 11	License type: CC BY 4.0

Affiliation: Universidad Autónoma del Estado de México

Abstract

Eggshell and an easily synthesized bionanocomposite of eggshell with Ag-Fe nanoparticles demonstrated to be efficient adsorbent materials for the removal of lead, arsenic, and mercury from water. The natural material and the bionanocomposite were characterized by TEM and XRD. Ag-Fe nanoparticles vary from 1 to 100 nm in size. Equilibrium times of the adsorption systems were achieved between 4 and 8 h. The experimental adsorption data fitted the pseudo-second and Elovich models; therefore, the adsorption of heavy metals ions took place mainly by a chemical process. The adsorption capacity of eggshell in mg/g was 7.01 for As5+, 3.90 for Pb2+, and 1.51 for Hg2+, while the nanocomposite adsorption capacity was 17.7 for As5+, 27.8 for Pb2+ and 15.88 for Hg2+.

Highlights

Heavy metals are one of the most widespread contaminants in water and wastewater [1]
In most cases excessive borohydride is needed to accelerate the Transmission electron microscopy has shown that thea iron nanoparticles synthesized can vary reaction to form nanoparticles, and to stabilize and provide uniform growth of iron crystals [40]
Hen eggshell is a material chemically composed by calcium carbonate in the form of calcite

Summary

Introduction

Heavy metals are one of the most widespread contaminants in water and wastewater [1]. They can be absorbed and accumulated in human body and cause serious health effects like cancer, organ damage, nervous system damage, and in extreme cases, death. The major sources of Pb2+ pollution are exhaust gases of petrol engines, which account for nearly. Apart from minerals, sources of Pb2+ are pesticides, fertilizer impurities, emissions from mining and smelting operations, while atmospheric pollution from the combustion of fossil fuels [2] are generated in electroplating, electrolysis depositions, conversion coating, and anodizing-cleaning, milling, and etching industries from printed circuit board (PCB) manufacturing [1].

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