TY - JOUR
T1 - Electro-Enhanced Membrane Sorption
T2 - A New Approach for Selective Ion Separation and Its Application to Phosphate and Arsenic Removal
AU - Chaudhury, Sanhita
AU - Nir, Oded
N1 - Funding Information:
This work was funded by the United States—Israel Binational Agricultural Research and Development (BARD) Fund, Grant no. IS-5209-19. S.C. acknowledges the Marcus family donation to the Water Science Fund of the Ben-Gurion University of the Negev for her postdoctoral scholarship.
Publisher Copyright:
© 2020 American Chemical Society.
PY - 2020/6/3
Y1 - 2020/6/3
N2 - We 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 ∼10-11 - much 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.
AB - We 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 ∼10-11 - much 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.
UR - http://www.scopus.com/inward/record.url?scp=85087455091&partnerID=8YFLogxK
U2 - 10.1021/acs.iecr.0c01498
DO - 10.1021/acs.iecr.0c01498
M3 - Article
AN - SCOPUS:85087455091
VL - 59
SP - 10595
EP - 10605
JO - Industrial and Engineering Chemistry Research
JF - Industrial and Engineering Chemistry Research
SN - 0888-5885
IS - 22
ER -