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Highly efficient removal of Cr(VI) ions from wastewater by the pomegranate-like magnetic hybrid nano-adsorbent of polydopamine and Fe3O4 nanoparticles

Abstract

Fe3O4 nanoparticles have attracted extensive attention to solve the Cr(VI) pollution, because they can effectively reduce Cr(VI) to less toxic and less soluble Cr(III)-containing species. However, these magnetic nano-adsorbents suffer from a very low adsorption capacity and low stability. To solve these drawbacks, we developed a pomegranate-like hybrid nanosphere (PHN) with a polydopamine (PDA) peel and Fe3O4 nanocrystal as seeds and applied as the adsorbent for removing Cr(VI) ions. The adsorption performance of the resultant PHN nano-adsorbent towards toxic Cr(VI) ions was evaluated systematically with respect to the solution pH, competing ions and temperature. The adsorption of Cr(VI) ions onto PHN nano-adsorbent is highly pH dependent with the optimal pH ranging from 2 to 4 and the PHN nano-adsorbent exhibit a remarkable sorption selectivity in complex wastewater. The nano-adsorbent has a fast adsorption rate for Cr(VI) ions that can reach the adsorption equilibrium in about 10 min and have a maximum adsorption capacity of PHN nano-adsorbents as high as 454.55 mg/g at 338K. In addition, the developed PHN adsorbent has a good recyclability. After 5 cycles of regeneration and adsorption, it can still maintain a high removal efficiency of Cr(VI) ions up to 92.5%.

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Supplementary files

Article information


Submitted
15 Mar 2020
Accepted
27 Jun 2020
First published
29 Jun 2020

New J. Chem., 2020, Accepted Manuscript
Article type
Paper

Highly efficient removal of Cr(VI) ions from wastewater by the pomegranate-like magnetic hybrid nano-adsorbent of polydopamine and Fe3O4 nanoparticles

J. Li, S. Chen, H. Xiao, G. Yao, Y. Gu, Q. Yang and B. Yan, New J. Chem., 2020, Accepted Manuscript , DOI: 10.1039/D0NJ01293A

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