Phosphate selective recovery by magnetic iron oxide impregnated carbon flow-electrode capacitive deionization (FCDI)

Zhang, Changyong; Wang, Min; Xiao, Wei; Ma, Jinxing; Sun, Jingyi; Mo, Hengliang; Waite, T. David

doi:10.1016/j.watres.2020.116653

Cited by 89 publications

(34 citation statements)

References 47 publications

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“…Compared with CNT electrodes, the Gu-PAH/CNT electrodes show phosphate selectivity during high voltage charging and even in the presence of divalent ions. According to the available literature, the phosphate removal capacity and selectivity of the Gu-PAH/CNT//COOH-CNT cell in mixed solutions were higher than those of existing CDI/MCDI cells (∼2.4 to 16 mg PO 4 3– g –1 , P/Cl selectivity 0.8–4). ,,,, Current electrode materials for phosphate removal/recovery generally require several hours to days to reach adsorption equilibrium and a high concentration of the regeneration solution or high voltage to achieve desorption. − However, the as-fabricated Gu-PAH/CNT electrode has a fast adsorption rate (achieving electroadsorption equilibrium within 5 min), superior ion adsorption capacity, excellent reuse performance, and selectivity removal of phosphate ions compared to conventional carbon-based or other electrodes in the literature, suggesting that the use of the Gu-PAH/CNT//COOH-CNT CDI system is a promising strategy for selective removal and recovery of phosphate from wastewater.…”

Section: Results and Discussionmentioning

confidence: 99%

“…On the one hand, the availability of phosphorus resources is rapidly decreasing because of the nonrenewable nature of phosphate ores . On the other hand, excessive phosphate discharge to surface waters results in the exacerbation of eutrophication and the occurrence of harmful algal bloom, threatening ecological safety and human health. , Municipal and industrial wastewaters are considered important phosphorus sources . Commonly employed techniques for phosphorus removal and recovery include physical, chemical, and biological processes, which usually require high energy consumption, chemical input, and complex pretreatment steps for phosphate concentration .…”

Section: Introductionmentioning

confidence: 99%

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Effective and Selective Removal of Phosphate from Wastewater Using Guanidinium-Functionalized Polyelectrolyte-Modified Electrodes in Capacitive Deionization

et al. 2021

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The potential phosphorus shortage along with phosphorus pollution has drawn global attention, calling for effective technologies for phosphorus removal and recovery from wastewater. Capacitive deionization (CDI) is a promising technology for salt removal and nutrient recovery. However, their performances suffer from limited ion storage capacity and low selectivity, e.g., phosphate removal was lower than the other salts. Herein, guanidinium-functionalized polyelectrolyte-coated carbon nanotube (Gu-PAH/CNT) electrodes were prepared through the self-assembly technique. The Gu-PAH/CNT electrodes selectively adsorbed phosphate ions and prevented the repulsion of coions due to the combined effect of the ion-selective polyelectrolyte layer and the NH protons of Gu groups, resulting in strong electrostatic and hydrogen-bond interactions with phosphate ions. The Gu-PAH/CNT anode was coupled with a COOH-CNT cathode for selective capture of phosphate in a CDI device. The phosphate ion adsorption capacity of Gu-PAH/CNT electrodes is up to 23−30 mg PO 4 3− g −1 in a phosphate solution with a wide pH range and mixtures (NaH 2 PO 4 /NaCl, NaH 2 PO 4 /Na 2 SO 4 , and NaH 2 PO 4 /NaNO 3 ) at 1.2 V, presenting superior electroadsorption capacity, phosphate selectivity, and stable regeneration property. These encouraging results demonstrate that functionalized polyelectrolyte-modified electrode materials act as powerful platforms for effective and selective removal and recovery of specific contaminants from wastewater.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effective and Selective Removal of Phosphate from Wastewater Using Guanidinium-Functionalized Polyelectrolyte-Modified Electrodes in Capacitive Deionization

et al. 2021

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“…However, phosphorus and nitrogen are also essential nutrients for agricultural production. As such, it would seem advantageous to recover these nutrients from waste streams for later use in agriculture. ,,− Motivated by this concept, many studies have been devoted to selective extraction of nutrients from wastewaters using FCDI technology. Fang et al and Zhang et al investigated ammonia and phosphate removal and preconcentration from synthetic wastewater using an FCDI device. , While more than 80% of the ammonia and phosphate present could be effectively removed, no attention was given to the subsequent recovery of ammonia or phosphorus.…”

Section: Environmental Applications Of Fcdimentioning

confidence: 99%

“…There is a critical need to enhance the selectivity toward these useful species during the resource recovery process . By developing innovative electrodes and membranes, , manipulating the operational modes, , and controlling the in situ Faradaic reactions appropriately, , FCDI can achieve the removal and recovery of target ions with a higher selectivity compared to conventional CDI systems (Figure a). For instance, an extraordinary NH 4 + /Na + selectivity factor of 31 was observed, even when the initial concentration of NH 4 + was only one-third of that of the competing Na + , with this high selectivity obtained on use of potassium dititanate (K 2 Ti 2 O 5 ) based flow-electrodes operated under SC mode .…”

Section: Environmental Applications Of Fcdimentioning

confidence: 99%

Flow Electrode Capacitive Deionization (FCDI): Recent Developments, Environmental Applications, and Future Perspectives

Zhang

Lei

et al. 2021

Environ. Sci. Technol.

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184

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With the increasing severity of global water scarcity, a myriad of scientific activities is directed toward advancing brackish water desalination and wastewater remediation technologies. Flow-electrode capacitive deionization (FCDI), a newly developed electrochemically driven ion removal approach combining ion-exchange membranes and flowable particle electrodes, has been actively explored over the past seven years, driven by the possibility of energy-efficient, sustainable, and fully continuous production of high-quality fresh water, as well as flexible management of the particle electrodes and concentrate stream. Here, we provide a comprehensive overview of current advances of this interesting technology with particular attention given to FCDI principles, designs (including cell architecture and electrode and separator options), operational modes (including approaches to management of the flowable electrodes), characterizations and modeling, and environmental applications (including water desalination, resource recovery, and contaminant abatement). Furthermore, we introduce the definitions and performance metrics that should be used so that fair assessments and comparisons can be made between different systems and separation conditions. We then highlight the most pressing challenges (i.e., operation and capital cost, scale-up, and commercialization) in the full-scale application of this technology. We conclude this state-of-the-art review by considering the overall outlook of the technology and discussing areas requiring particular attention in the future.

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“…Most recently, CDI has been studied by many researchers because of its high feasibility and potential in the field of removing phosphate. A study succeeded in carrying out the goal of attaining phosphate adsorption by taking advantage of magnetic carbon electrodes with 10 wt% Fe 3 O 4 in CDI (Zhang et al 2021). Jiang successfully demonstrated phosphate removal in the CDI process with a layered double hydroxide/reduced graphene oxide (LDH/rGO) composite electrode in water (Hong et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Selective adsorption of phosphate by carboxyl-modified activated carbon electrodes for capacitive deionization

Miao

Deng

Chen

et al. 2021

Water Science and Technology

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Capacitive deionization (CDI) has been considered as a promising technology for removing phosphate from water but suffer inferior selectivity and electrosorption performances for phosphate of current carbon electrodes in CDI. Herein, we achieved highly selective phosphate removal from a ternary effluent of Cl−, , and by using nitric acid-treated activated carbon (AC) with various modification times and pure AC as the anode and cathode, a novel phosphate selective asymmetric CDI reactor. The results showed that carboxyl groups greatly grafted on the materials after modification (varying from 0.00084 to 0.0012 mol g−1). The phosphate selectivity of the present research was higher than that of unmodified CDI, and it increased with the increase of carboxyl groups content. The highest phosphate selectivity (2.01) in modified materials is almost six times higher than that of pure AC. Moreover, the modified electrodes exhibited good regenerative ability with a phosphate desorption efficiency of around 72.12% during the adsorption/desorption process and great stability during the cycling experiment. These results demonstrated that the innovative application of nitric acid-modified AC can effectively selectively remove phosphate from mixed anion solution, opening a hopeful window to selective adsorption in water treatment by CDI.

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Phosphate selective recovery by magnetic iron oxide impregnated carbon flow-electrode capacitive deionization (FCDI)

Cited by 89 publications

References 47 publications

Effective and Selective Removal of Phosphate from Wastewater Using Guanidinium-Functionalized Polyelectrolyte-Modified Electrodes in Capacitive Deionization

Effective and Selective Removal of Phosphate from Wastewater Using Guanidinium-Functionalized Polyelectrolyte-Modified Electrodes in Capacitive Deionization

Flow Electrode Capacitive Deionization (FCDI): Recent Developments, Environmental Applications, and Future Perspectives

Selective adsorption of phosphate by carboxyl-modified activated carbon electrodes for capacitive deionization

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