Enhanced electrosorption selectivity of phosphate using an anion-exchange resin-coated activated carbon electrode

Shen, Yu-Yi; Hsu, Chung-Chun; Tsai, Shao-Wei; Hou, Chia‐Hung

doi:10.1016/j.jcis.2021.04.129

Cited by 22 publications

(5 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Additionally, in our study, R-MCDI with a circulated electrolyte enabled sufficient P enrichment without the requirement of separating the carbon electrode and electrolyte; novel off-flow desorption simplified the operation and realized sustained concentrating of P in the reservoir. With a much lower voltage applied (1.2 V) than in electrodialysis, R-MCDI delivered a remarkably increased P removal rate [0.042–0.072 μmol/(cm 2 ·min)] than other CDI-derived devices, e.g., CDI [0.007–0.021 μmol/(cm 2 ·min)] , and FCDI [0.004–0.039 μmol/(cm 2 ·min)], ,, and significantly reduced energy consumption (6.8–28.2 kW h/kg P).…”

Section: Results and Discussionmentioning

confidence: 99%

Sustained Phosphorus Removal and Enrichment through Off-Flow Desorption in a Reservoir of Membrane Capacitive Deionization

He,

Gao,

Gong

et al. 2024

Environ. Sci. Technol.

View full text Add to dashboard Cite

In this study, we used a membrane capacitive deionization device with a reservoir (R-MCDI) to enrich phosphorus (P) from synthetic wastewater. This R-MCDI had two small-volume electrode chambers, and most of the electrolyte was contained in the reservoir, which was circulated along the electrode chambers. Compared with conventional MCDI, R-MCDI exhibited a phosphate removal rate of 0.052 μmol/(cm 2 •min), approximately double that of MCDI. This was attributed to R-MCDI's utilization of OH − alternative adsorption to remove phosphate from the influent. Noticing that around 73.9% of the removed phosphate was stored in the electrolyte in R-MCDI, we proposed a novel off-flow desorption operation to enrich the removed phosphate in the reservoir. Exciting results from the multicycle experiment (∼8 h) of R-MCDI showed that the PO 4 3− -P concentration in the reservoir increased all the way from the initial 152 mg/L to the final 361 mg/L, with the increase in the P charge efficiency from 5.5 to 22.9% and the decrease in the energy consumption from 28.2 to 6.8 kW h/kg P. The P recovery performance of R-MCDI was evaluated by viewing other similar studies, which revealed that R-MCDI in this study achieved superior P enrichment with low energy consumption and that the off-flow desorption proposed here considerably simplified the operation and enabled continuous P enrichment.

show abstract

Section: Results and Discussionmentioning

confidence: 99%

Sustained Phosphorus Removal and Enrichment through Off-Flow Desorption in a Reservoir of Membrane Capacitive Deionization

He,

Gao,

Gong

et al. 2024

Environ. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…License: CC BY-NC-ND 4.0 The second set of experiments investigated the pH effect on phosphate selectivity with pristine and composite AEMs in MCDI. As shown in equations ( 7)-( 9) 27,28,32 , a strong acid environment (pH < 2.15) leads to H3PO4 being the major species. pH adjusting the stream to over 7.20 deprotonates H3PO4 to H2PO4 -.…”

Section: Figures 3cmentioning

confidence: 99%

“…Furthermore, the higher P/Cl selectivity at pH 8.63 could arise from the stronger electrostatic attraction between divalent HPO4 2ions and the carbon electrode surface when compared to the monovalent H2PO4ions and carbon electrode surface 27,28,73 . The electrosorption capacity of carbon electrodes is a function of the with ionic charge in the solution 27,74 . The next experiments studied phosphate removal efficiency and P/Cl selectivity as a function of the applied cell voltage.…”

Section: Figures 3cmentioning

confidence: 99%

“…Previous researchers have modified electrode materials to achieve selective phosphate removal via CDI or MCDI. 20,[26][27][28] Transition metals such as Fe 7,8,29,30 , Mn 6,8,9 , Zr 26,31 and Cu 29 form inner-sphere complexes with phosphorous thereby increasing the absorption and selectivity of phosphate over competing ions. For instance, Zhang et al 26 reported an organic-inorganic composite material (ZnZr-COOH/CNT) as an electrode in CDI, which exhibited a high adsorption capacity of phosphate under a low feed concentration of phosphate (~10 mg/L).…”

Section: Introductionmentioning

confidence: 99%

“…Another strategy to improve phosphate selectivity involves the use of ion exchange layer coatings on the electrodes. Shen et al 27 reported an anion exchange resin-coated activated carbon electrode that improved P/Cl to 0.56. The baseline control showed a P/Cl of 0.25 with uncoated activated carbon electrode.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Selective phosphate removal with manganese oxide composite anion exchange membranes in membrane capacitive deionization

Yang,

Zhang,

Shrimant

et al. 2024

Preprint

View full text Add to dashboard Cite

The discharge of excessive phosphorous into water bodies can lead to serious eutrophication threatening aquatic ecosystem. Membrane capacitive deionization (MCDI) is an effective platform for deionizing aqueous streams; however, conventional MCDI is unable to selectively remove targeted ions from a liquid mixture. In this work, we fabricated manganese oxide composite anion exchange membranes (AEMs) for MCDI to enhance phosphate removal selectivity from sodium chloride-sodium dihydrogen phosphate (10:1 molar ratio) aqueous mixtures. We systematically investigated several critical factors, such as constant current or voltage operation, applied voltage amount, process stream pH, and manganese oxide content in the AEM, on phosphate removal efficiency and phosphate selectivity. A trade-off was observed between phosphate removal and selectivity when increasing the cell voltage. Under the best conditions, an MCDI unit with a 20 wt% Mn2O3 composite AEM and a bipolar membrane facilitated high phosphate removal efficiency of ≥ 31.8 % and a phosphate over chloride selectivity of 1.1 while showing stability for at least 30 cycles. To help understand how manganese oxide particles boost AEM selectivity, static electronic structure calculations were performed, and they revelated that hydrogen phosphate absorption on Mn2O3 composite AEM was 314 kcal/mol more exothermic than that on pristine AEM while chloride adsorption on Mn2O3 composite AEM was 2.2 kcal/mol less exothermic than that on a pristine AEM. Overall, this work presents an effective strategy for selectively removing phosphate from model wastewater solutions and the mechanistic understanding that governs ion selectivity in composite ion-exchange membranes used in MCDI.

show abstract

Electrosorption of phenolic compounds by carbon sheet electrode from zinc chloride functionalized activated carbon from pomegranate husk

Torabi

Taheri

Pourzamani

et al. 2023

Chemical Engineering Journal

View full text Add to dashboard Cite

Enhanced electrosorption selectivity of phosphate using an anion-exchange resin-coated activated carbon electrode

Cited by 22 publications

References 48 publications

Sustained Phosphorus Removal and Enrichment through Off-Flow Desorption in a Reservoir of Membrane Capacitive Deionization

Sustained Phosphorus Removal and Enrichment through Off-Flow Desorption in a Reservoir of Membrane Capacitive Deionization

Selective phosphate removal with manganese oxide composite anion exchange membranes in membrane capacitive deionization

Electrosorption of phenolic compounds by carbon sheet electrode from zinc chloride functionalized activated carbon from pomegranate husk

Contact Info

Product

Resources

About