Enhanced phosphate removal under an electric field via multiple mechanisms on MgAl-LDHs/AC composite electrode

doi:10.1016/j.jelechem.2019.01.046

	Enhanced phosphate removal under an electric field via multiple mechanisms on MgAl-LDHs/AC composite electrode
	Hong X.1; Zhu E.3; Ye Z.3; Hui K.S.4; Hui K.N.2
	2019-03-01
Source Publication	Journal of Electroanalytical Chemistry
ISSN	15726657
Volume	836 Pages:16-23
Abstract	Phosphorus removal is essential to avoid eutrophication in water bodies. Layered double hydroxides (LDHs) are widely used to scavenge phosphate through intercalated ion exchange or surface complexation. Moreover, LDHs have attracted increasing attention as electrode modifiers for supercapacitors. Researchers have begun to re-delve the electrosorption technology according to the fundamental principle of electrical double layers. Herein, we propose a new phosphate removal method inspired by the adsorption characteristic and electrical double-layer capacitive properties of LDHs through electrosorption via capacitive deionization. We present a series of experiments to study the enhanced phosphate removal under an electric field via multiple mechanisms on the MgAl-LDHs/AC electrode. The uptake of phosphate by MgAl-LDHs/AC was investigated as a function of phosphate concentration, applied voltage, electrode materials, and temperature. The MgAl-LDHs/AC electrode possessed a salt removal capacity of 67.92 mg PO ·g (1.2 V, 250 mg·L KH PO , 30 °C). The electrosorption kinetics of phosphate ions onto the capacitive deionization electrode followed the pseudo-second-order kinetics model rather than the pseudo-first-order kinetics model. Furthermore, the adsorption isotherms of phosphate on the MgAl-LDHs/AC electrode fitted the Freundlich model better than the Langmuir model. The proposed method could be used for phosphate removal.
Keyword	Electrosorption MgAl-LDHs/AC electrode Multiple mechanisms Phosphate removal
DOI	10.1016/j.jelechem.2019.01.046
URL	View the original
Language	英語
Fulltext Access	View Full-Text via DOI View Full-Text via Scopus
Citation statistics
Document Type	Journal article
Collection	University of Macau
Affiliation	1.Zhejiang Sci-Tech University 2.Universidade de Macau 3.Fuzhou University 4.University of East Anglia
Recommended Citation GB/T 7714	Hong X.,Zhu E.,Ye Z.,et al. Enhanced phosphate removal under an electric field via multiple mechanisms on MgAl-LDHs/AC composite electrode[J]. Journal of Electroanalytical Chemistry,2019,836:16-23.
APA	Hong X.,Zhu E.,Ye Z.,Hui K.S.,&Hui K.N..(2019).Enhanced phosphate removal under an electric field via multiple mechanisms on MgAl-LDHs/AC composite electrode.Journal of Electroanalytical Chemistry,836,16-23.
MLA	Hong X.,et al."Enhanced phosphate removal under an electric field via multiple mechanisms on MgAl-LDHs/AC composite electrode".Journal of Electroanalytical Chemistry 836(2019):16-23.

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