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Influence of various experimental parameters on the capacitive removal of phosphate from aqueous solutions using LDHs/AC composite electrodes
Zhu E.1; Hong X.1; Ye Z.3; Hui K.S.4; Hui K.N.2
2019-05-15
Source PublicationSeparation and Purification Technology
ISSN18733794 13835866
Pages454-462
AbstractThe efficient uptake of phosphate from aqueous solutions was achieved on layered double hydroxides (LDHs)-based electrodes via capacitive desalination in our previous study. The current follow-up work was mainly carried out to study the influence of various experimental parameters on the capacitive removal of phosphate using LDHs/activated carbon (LDHs/AC) composite electrodes. A series of batch experiments were implemented to investigate the experimental factors, including Mg /Al ratios (2, 3, and 4), trivalent metal cations (Al , Fe , Cr ), initial solution pH (from 3 to 10), coexisting anions (NO , Cl , SO ), and ion strengths, in capacitive deionization. The electrode materials before and after capacitive deionization were characterized to reinforce the analysis of the adsorption mechanisms by X-ray powder diffraction, scanning electron microscopy, energy dispersive X-ray, cyclic voltammetry, and electrochemical impedance spectroscopy. Results indicated that the Mg-Al LDHs/AC electrodes exhibited higher phosphate adsorption capacity (80.43 mg PO /g), more regular morphology, and higher degree of crystallinity than that of Mg-Fe LDHs/AC and Mg-Cr LDHs/AC. Increasing Mg /Al ratios enhanced the adsorption capacity of phosphate. The uptake of phosphate by Mg-Al LDHs/AC under circumneutral pH and low ion strength reached the maximum level. Furthermore, the presence of coexisting anions lowered the adsorption capacity of phosphate mainly due to the occurrence of a compressed electrical double layer. Therefore, the influence of different experimental parameters on phosphate removal via capacitive deionization by Mg-Al LDHs/AC necessitates a systematic investigation to optimize the preparation conditions of LDHs-based electrodes and several important operating parameters.
KeywordCapacitive deionization Coexisting anion Ion strengths Layered double hydroxide Phosphate removal
DOI10.1016/j.seppur.2019.01.004
URLView the original
Language英語
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Document TypeJournal article
CollectionUniversity of Macau
Affiliation1.Zhejiang Sci-Tech University
2.Universidade de Macau
3.Fuzhou University
4.University of East Anglia
Recommended Citation
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Zhu E.,Hong X.,Ye Z.,et al. Influence of various experimental parameters on the capacitive removal of phosphate from aqueous solutions using LDHs/AC composite electrodes[J]. Separation and Purification Technology,2019:454-462.
APA Zhu E.,Hong X.,Ye Z.,Hui K.S.,&Hui K.N..(2019).Influence of various experimental parameters on the capacitive removal of phosphate from aqueous solutions using LDHs/AC composite electrodes.Separation and Purification Technology,454-462.
MLA Zhu E.,et al."Influence of various experimental parameters on the capacitive removal of phosphate from aqueous solutions using LDHs/AC composite electrodes".Separation and Purification Technology (2019):454-462.
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