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Electro-Enhanced Membrane Sorption: A New Approach for Selective Ion Separation and Its Application to Phosphate and Arsenic Removal
journal contribution
posted on 2020-05-21, 21:13 authored by Sanhita Chaudhury, Oded NirWe
describe a new electro-enhanced sorption approach, where an
electric field is applied across an ion-selective nanocomposite membrane.
Unlike capacitive deionization, here, the membrane rather than the
electrode functions as the sorbent, whereas the electrodes are inert.
This electrode-sorbent decoupling extends the space of suitable sorption
materials, currently constrained to conductive materials. Here, we
synthesized ferric oxyhydroxide (FeO) nanocomposite membranes (FeOm)
using diffusion-controlled growth of FeO nanoparticles within porous
track-etched membranes, resulting in a high-capacity sorbent. The
use of FeOm to study the electro-enhanced sorption of phosphate revealed that the electric potential (5–15 V) accelerates
both the adsorption and desorption steps. Furthermore, desorption
at pH ∼10–11much lower than the current practice
for FeO regeneration (pH 13–14)was demonstrated, potentially
enabling 2–3 orders of magnitude savings on chemical consumption.
Lastly, a highly selective uptake of arsenate from
simulated groundwater was demonstrated, pointing at the potential
of the new approach to intensify sorption processes.
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capacitive deionizationchemical consumptionmagnitude savingstrack-etched membraneselectrode functionsion-selective nanocomposite membranediffusion-controlled growthElectro-Enhanced Membrane SorptionNew Approachelectrode-sorbent decouplingconductive materialselectro-enhanced sorptionpHArsenic Removalelectro-enhanced sorption approachSelective Ion Separationsorption materialsdesorption stepssorption processesFeOmferric oxyhydroxidenanocomposite membranesFeO nanoparticlesFeO regeneration
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