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Magnesium silicate coated electrospun fiber flexible adsorbent for high-efficiency removal of toxic cationic herbicide

Abstract

Organic cationic herbicides have been widely used in modern agriculture and their discharge into the environment has become a serious problem. In this study, magnesium silicate functionalized PAN (MgSiO/PAN) fibers were synthesized by electrospinning technique and hydrothermal approach, which were explored as attractive adsorbents for cationic herbicide polluted wastewater treatments. The batch adsorption behavior toward cationic herbicide diquat by MgSiO/PAN fibers was investigated, including effects of pH, adsorption kinetics, adsorption isotherms and ionic strength. It was found the adsorption isotherm of MgSiO/PAN composite fibers were fitted better with the Langmuir isotherm model. The adsorption behaviors showed maximum adsorption capacity of 197.53 mg/g for diquat, which was higher than that of many other adsorbents. Kinetics of the diquat adsorption were found to follow a pseudo-second-order rate equation. Meanwhile, the adsorbent had a good recyclability and the removal efficiency remained at 83% after five adsorption–desorption cycles. Most importantly, the MgSiO/PAN fibers could remove 99.1% of diquat by dynamic filtration experiment. These findings demonstrate that the MgSiO/PAN fiber membranes could be potentially applied to the efficient removal of diquat in wastewater treatment.

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Publication details

The article was received on 23 Aug 2017, accepted on 06 Nov 2017 and first published on 07 Nov 2017


Article type: Paper
DOI: 10.1039/C7NJ03168H
Citation: New J. Chem., 2017, Accepted Manuscript
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    Magnesium silicate coated electrospun fiber flexible adsorbent for high-efficiency removal of toxic cationic herbicide

    Y. Li, R. Zhao, S. Chao, B. Sun, N. Zhang, J. Qiu, C. Wang and X. Li, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ03168H

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