Combined nanofiltration and advanced oxidation processes with bifunctional carbon nanomembranes

Barak Shapira, Tirupathi Rao Penki, Izaak Cohen, Yuval Elias, Raphael Dalpke, André Beyer, Armin Gölzhäuser, Eran Avraham, Doron Aurbach

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Wastewater reclamation is becoming a top global interest as population growth and rapid industrialization pose a major challenge that requires development of sustainable cost-effective technologies and strategies for wastewater treatment. Carbon nanomembranes (CNMs) - synthetic 2D carbon sheets - can be tailored chemically with specific surface functions and/or physically with nanopores of well-defined size as a strategy for multifunctional membrane design. Here, we explore a bifunctional design for combined secondary wastewater effluent treatment with dual action of membrane separation and advanced oxidation processes (AOP), exploiting dissolved oxygen. The bifunctional membrane consists of a CNM layer on top of a commercial ultrafiltration membrane (Microlon™) and a spray-coated reduced graphene oxide (rGO) thin film as the bottom layer. The CNM/support/rGO membrane was characterized by helium ion and atomic force microscopy, FTIR, XPS with a four-point conductivity probe, cyclic voltammetry, galvanostatic measurements, and impedance spectroscopy. Combined treatment of water by nanofiltration and AOP was demonstrated, employing a unique three electrode-dead end filtration setup that enables concurrent application of potential and pressure on the integrated membrane. For the model organic compound methylene blue, oxidation (by the Fenton reaction) was evaluated using UV-vis (610 nm). The rejection rate and permeability provided by the CNM layer were evaluated by dissolving polyethylene glycol (400 and 1000 Da) in the feed solution and applying pressure up to 1.5 bar. This demonstration of combined membrane separation and AOP using an integrated membrane opens up a new strategy for wastewater treatment.

Original languageEnglish
Pages (from-to)14777-14786
Number of pages10
JournalRSC Advances
Volume11
Issue number24
DOIs
StatePublished - 15 Apr 2021

Bibliographical note

Publisher Copyright:
© The Royal Society of Chemistry.

Funding

We appreciate the support of the BMBF-MOST grants 204760 (MOST) and 02WIL1453B (BMBF) for water technologies, and the help of Professor Menachem Elimelech from the Department of Chemical and Environmental Engineering at Yale University.

FundersFunder number
BMBF-MOST204760
Yale University
Bundesministerium für Bildung und Forschung
Ministry of Science and Technology, Taiwan02WIL1453B

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