Issue 10, 2022

Enhanced electro-peroxymonosulfate activation using a carbon nanotube filter with a functionalized polyelectrolyte

Abstract

An innovative electroactive membrane was designed by polyelectrolyte modification for electro-PMS activation and degradation of refractory organic contaminants in a flow-through filtration model. The pivotal component of this design is a nanohybrid filter, which consists of carbon nanotubes (CNTs) and conductive poly(diallyl dimethylammonium chloride) (PDDA). The study showed that the PDDA–CNT filter could achieve complete CR degradation in 40 min under a PMS concentration of 1.5 mM, an applied voltage of −1 V, and a flow rate of 5 mL min−1 in a continuous-flow configuration. In particular, thanks to the convection mass transmission enhancement, the flow-through scheme exhibited a remarkable 2-times-higher CR degradation efficiency than a traditional batch configuration (44.6%). The excellent organic degradation performance originates from the synergistic affections of electrochemical activity, flow-through design, and abundant active sites. Electron paramagnetic resonance (EPR) techniques and quenching tests verified the singlet oxygen (1O2) and direct electron transfer dominated the CR degradation process with electro-PMS activation. Such performance was adaptable over a wide pH window of the solution. The presence of common competitive anions produced inappreciable inhibition to the CR degradation kinetics. This research provides new insights into the rational design of a metal-free PMS activation catalyst toward water decontamination by integrating the state-of-the-art advanced oxidation process, electrochemistry, and membrane separation into a single operating unit.

Graphical abstract: Enhanced electro-peroxymonosulfate activation using a carbon nanotube filter with a functionalized polyelectrolyte

Supplementary files

Article information

Article type
Paper
Submitted
29 mai 2022
Accepted
13 août 2022
First published
16 août 2022

Environ. Sci.: Water Res. Technol., 2022,8, 2314-2325

Enhanced electro-peroxymonosulfate activation using a carbon nanotube filter with a functionalized polyelectrolyte

C. Ma, X. Fang, S. Jiang, F. Li and Y. Liu, Environ. Sci.: Water Res. Technol., 2022, 8, 2314 DOI: 10.1039/D2EW00398H

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