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 maí 2022
Accepted
13 ágú. 2022
First published
16 ágú. 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

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements