Capacitive deionization and electrosorption for heavy metal removal

Chen, Raylin; Sheehan, Thomas; Ng, Jing Lian; Brucks, Matthew; Su, Xiao

doi:10.1039/c9ew00945k

Cited by 105 publications

(84 citation statements)

References 153 publications

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“…On the conductive counter electrodes, water decomposition can be a major cathodic parasitic reaction at very negative overpotentials. [ 5,7c ] By coupling the P(TMA 51 ‐ co ‐TMPMA 49 )‐CNT with BDD, we can efficiently store electrons through NO•/+NO electrochemistry at more moderate overpotentials to avoid water splitting, and while its redox‐process can be directly connected to electrochemically‐controlled PFOA capture and release.…”

Section: Resultsmentioning

confidence: 99%

“…[ 1a,6 ] Redox‐active materials provide an attractive electrosorption platform for the capture of specific pollutants, including heavy metal oxyanions, hydrophobic pollutants, and organic anions. [ 1a,2,7 ] Redox‐electrodes have been studied also as catalytic interfaces for degradation of organic contaminants, [ 8 ] opening the door to the integration of separation and reaction steps. [ 5,7b ] In addition, the asymmetric design of redox‐electrodes can lead to dramatic increases in energy efficiency for water purification systems, by reducing operating voltages, and enabling complementary operations at the anode and the cathode.…”

Section: Introductionmentioning

confidence: 99%

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Molecular Tuning of Redox‐Copolymers for Selective Electrochemical Remediation

Kim

Medina

Elbert

et al. 2020

Adv Funct Materials

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Molecular design of redox-materials provides a promising technique for tuning physicochemical properties which are critical for selective separations and environmental remediation. Here, the structural tuning of redox-copolymers, 4-methacryloyloxy-2,2,6,6-tetramethylpiperidin-1-oxyl (TMA) and 4-methacryloyloxy-2,2,6,6-tetramethylpiperidine (TMPMA), denoted as P(TMA x-co-TMPMA 1−x), is investigated for the selective separation of anion contaminants ranging from perfluorinated substances to halogenated aromatic compounds. The amine functional groups provide high affinity toward anionic functionalities, while the redox-active nitroxyl radical groups promote electrochemically-controlled capture and release. Controlling the ratio of amines to nitroxyl radicals provides a pathway for tuning the redox-activity, hydrophobicity, and binding affinity of the copolymer, to synergistically enhance adsorption and regeneration. P(TMA x-co-TMPMA 1−x) removes a model perfluorinated compound (perfluorooctanoic acid (PFOA)) with a high uptake capacity (>1000 mg g −1) and separation factors (500 vs chloride), and demonstrates exceptional removal efficiencies in diverse perand polyfluoroalkyl substances (PFAS) and halogenated aromatic compounds, in various water matrices. Integration with a boron-doped diamond electrode allows for tandem separation and destruction of pollutants within the same electrochemical cell, enabling the energy integration of the separation step with the catalytic degradation step. The study demonstrates for the first time the tuning of redox-copolymers for selective remediation of organic anions, and integration with an advanced electrochemical oxidation process for energy-efficient water purification.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Molecular Tuning of Redox‐Copolymers for Selective Electrochemical Remediation

Kim

Medina

Elbert

et al. 2020

Adv Funct Materials

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“…Eqn (10) is solved together with local electroneutrality at each position in the macropores, c mA,Na + + c mA,K + À c mA,Cl À = 0 (11) At each x-coordinate, the relationship between electrode potential f e , solution potential f mA and occupancy of a cation in the IHC, W i , is implemented. This is given by the extended Frumkin equation eqn (12) for binary mixtures, 78…”

Section: View Article Onlinementioning

confidence: 99%

Recent advances in ion selectivity with capacitive deionization

Gamaethiralalage

Singh

Şahin

et al. 2021

Energy Environ. Sci.

288

128

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“…In this work, as shown in Figure 1, we develop ac ontinuousflow system for electrosorptive removal andr ecovery of vanadium(V)o xyanionsf rom aqueous solutions using redox-active electrodes. To this end, we employ an intrinsic affinity of redox-active ferrocenem oieties (in the form of PVFc) towards metal oxyanions [34,36] and fabricatea na symmetric flow cell for selectivev anadium removal. The redox-activea node and cathode used are, respectively,P VFc-functionalized carbon nanotubes (CNTs) and conducting polymer polypyrrole (PPy) doped with anionic surfactant sodium dodecylbenzenesulfonate (SDBS).…”

Section: Introductionmentioning

confidence: 99%