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Graphene oxide-based degradation of metaldehyde: effective oxidation through a modified Fenton’s process

Graphene oxide-based degradation of metaldehyde: effective oxidation through a modified Fenton’s process
Graphene oxide-based degradation of metaldehyde: effective oxidation through a modified Fenton’s process
A modified graphene oxide-based Fenton’s reaction has been investigated for the degradation of a challenging emerging contaminant which is not effectively removed in conventional water treatment. Metaldehyde, used as the challenge molecule in this study, is a common molluscicide that (like many highly soluble contaminants) has frequently breached European regulatory limits in surface waters. The new method involves graphene with higher hydrophilic characteristics (single-layer graphene oxide, SLGO) as a system that participates in a redox reaction with hydrogen peroxide and which can potentially stabilize the radical dotOH generated, which subsequently breaks down organic contaminants. The modified Fenton’s reaction has shown to be effective in degrading metaldehyde in natural waters (>92% removal), even at high contaminant concentrations (50 mg metaldehyde/L) and in the presence of high background organic matter and dissolved salts. The reaction is relatively pH insensitive. SLGO maintained its catalytic performance over 3 treatment cycles when immobilized. Its performance gradually decreased over time, reaching around 50% of starting performance on the 10th treatment cycle. X-ray photoelectron spectroscopy (XPS) analysis of modifications caused in SLGO by the oxidizing treatment indicated that the oxidation of Csingle bondC sp2 to carbonyl groups may be the cause of the decrease in performance. The proposed modified Fenton’s process has the potential to substitute traditional Fenton’s treatment although regeneration of the nanocarbon is required for its prolonged use.
single layer graphene oxide (SLGO), fenton, catalysis, water treatment, metaldehyde
1385-8947
159-167
Nguyen, Linh Viet
544d9bb5-029d-46ac-a0d3-75903d3167be
Busquets, Rosa
d3f8511d-c34e-4bf7-956c-19e4c1c5949f
Ray, Santanu
1a09c895-d9b2-472e-a358-ecbafb2cdf0e
Cundy, Andrew B.
994fdc96-2dce-40f4-b74b-dc638286eb08
Nguyen, Linh Viet
544d9bb5-029d-46ac-a0d3-75903d3167be
Busquets, Rosa
d3f8511d-c34e-4bf7-956c-19e4c1c5949f
Ray, Santanu
1a09c895-d9b2-472e-a358-ecbafb2cdf0e
Cundy, Andrew B.
994fdc96-2dce-40f4-b74b-dc638286eb08

Nguyen, Linh Viet, Busquets, Rosa, Ray, Santanu and Cundy, Andrew B. (2017) Graphene oxide-based degradation of metaldehyde: effective oxidation through a modified Fenton’s process. Chemical Engineering Journal, 307, 159-167. (doi:10.1016/j.cej.2016.08.052).

Record type: Article

Abstract

A modified graphene oxide-based Fenton’s reaction has been investigated for the degradation of a challenging emerging contaminant which is not effectively removed in conventional water treatment. Metaldehyde, used as the challenge molecule in this study, is a common molluscicide that (like many highly soluble contaminants) has frequently breached European regulatory limits in surface waters. The new method involves graphene with higher hydrophilic characteristics (single-layer graphene oxide, SLGO) as a system that participates in a redox reaction with hydrogen peroxide and which can potentially stabilize the radical dotOH generated, which subsequently breaks down organic contaminants. The modified Fenton’s reaction has shown to be effective in degrading metaldehyde in natural waters (>92% removal), even at high contaminant concentrations (50 mg metaldehyde/L) and in the presence of high background organic matter and dissolved salts. The reaction is relatively pH insensitive. SLGO maintained its catalytic performance over 3 treatment cycles when immobilized. Its performance gradually decreased over time, reaching around 50% of starting performance on the 10th treatment cycle. X-ray photoelectron spectroscopy (XPS) analysis of modifications caused in SLGO by the oxidizing treatment indicated that the oxidation of Csingle bondC sp2 to carbonyl groups may be the cause of the decrease in performance. The proposed modified Fenton’s process has the potential to substitute traditional Fenton’s treatment although regeneration of the nanocarbon is required for its prolonged use.

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More information

Accepted/In Press date: 9 August 2016
e-pub ahead of print date: 12 August 2016
Published date: 1 January 2017
Keywords: single layer graphene oxide (SLGO), fenton, catalysis, water treatment, metaldehyde
Organisations: Geochemistry

Identifiers

Local EPrints ID: 401472
URI: http://eprints.soton.ac.uk/id/eprint/401472
ISSN: 1385-8947
PURE UUID: dbbc13fe-bec8-4c24-a91f-2b2086faad92
ORCID for Andrew B. Cundy: ORCID iD orcid.org/0000-0003-4368-2569

Catalogue record

Date deposited: 12 Oct 2016 10:44
Last modified: 28 Apr 2022 04:05

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Contributors

Author: Linh Viet Nguyen
Author: Rosa Busquets
Author: Santanu Ray
Author: Andrew B. Cundy ORCID iD

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