Developing a magnetic nanocomposite adsorbent based on carbon quantum dots prepared from Pomegranate peel for the removal of Pb(II) and Cd(II) ions from aqueous solution

Mohammad Manzari,Hamideh Asadollahzadeh,Mahdiyeh Ghazizadeh

doi:10.24200/amecj.v4.i03.149

Mohammad Manzari, Hamideh Asadollahzadeh + Show 1 more

Open Access

https://doi.org/10.24200/amecj.v4.i03.149

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Abstract

Agriculture waste is a good choice for the production of carbon dots owing to its abundance, wide availability, eco-friendly nature. In this study a novel magnetic bioadsorbent based on carbon quantum dots (Fe3O4-PPCQDs) from Pomegranate peel (PP) was used as adsorbent to remove lead (Pb) and cadmium (Cd) from 50 mL of water and wastewater samples by magnetic solid phase extraction (MSPE). After adsorption ions with Fe3O4-PPCQDs at pH=6, the concentration of Pb(II) and Cd (II) ions were determined by flame atomic absorption spectrometry (F-AAS). The manufactured of Fe3O4-PPCQDs and GO nanostructures were structurally characterized by scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FT-IR). The quantum dots were optically characterized by UV–Vis spectroscopy. Batch adsorption experiment was conducted to examine the effects of pH, contact time, temperature and initial concentration of Pb(II) and Cd(II) from the water. The preconcentration factor and LOD for Cd and Pb were obtained 50, and (1.3 μg L-1; 15.5 μg L-1), respectively. The equilibrium data of ions sorption were well described by Langmuir and Freundlich model. The R2 values obtained by Langmuir model were higher. The absorption capacity of Fe3O4-PPCQDs for cadmium and lead were obtained 17.92 and 23.75 mg g-1, respectively.

Highlights

Environmental pollution based on the organic chemical compounds (VOCs) and heavy metals (M) have needed a serious threat due to the rapid development of the chemical industry and the toxic effect in environment
No study has been done on surface modification of iron oxide by using carbon quantum dots prepared from pomegranate peel for developing magnetic nanocomposite (Fe3O4-PPCQDs)
In this article, the adsorption potential of the Fe3O4PPCQDs nanocomposite was investigated for the removal of Pb(II) and Cd(II) ions

Summary

Introduction

Environmental pollution based on the organic chemical compounds (VOCs) and heavy metals (M) have needed a serious threat due to the rapid development of the chemical industry and the toxic effect in environment. Iron oxide has excellent magnetic properties, the high biocompatibility, easy separation through external magnetic field, reusability and comparatively low cost. No study has been done on surface modification of iron oxide by using carbon quantum dots prepared from pomegranate peel for developing magnetic nanocomposite (Fe3O4-PPCQDs). The PPCQDs adsorbent has generated from the pomegranate peel and functionalized with Fe3O4 as magnetic nanostructure which was used for removing toxic ions from wastewater. Another advantage is that the loaded adsorbents could be separated from the aqueous solution using magnet instead of centrifugation conserving energy. The material preparation, the characterization and the batch-type removal experiments were carried out wherein the feasibility of the above described composite for the removal of heavy metals Cd(II) and Pb(II) from aqueous solution which were investigated by varying the process conditions

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