Electrogeneration of H 2 O 2 by graphite felt double coated with polytetrafluoroethylene and polydimethylsiloxane

Efficient and steady electrogeneration of H O is a significant step in the Electro-Fenton water treatment process. This study fabricates a polytetrafluoroethylene (PTFE) coated graphite felt cathode with a polydimethylsiloxane (PDMS) damp-proof coating to generate H O in a flow-through system withou...

Full description

Saved in:
Bibliographic Details
Published inJournal of environmental chemical engineering Vol. 10; no. 4
Main Authors Zhao, Yuwei, Hojabri, Shayan, Sarrouf, Stephanie, Alshawabkeh, Akram N
Format Journal Article
LanguageEnglish
Published Netherlands 01.08.2022
Subjects
Electro-Fenton
Hydrogen peroxide
PTFE
Graphite felt
PDMS
Online AccessGet full text

Cover

More Information
Summary:Efficient and steady electrogeneration of H O is a significant step in the Electro-Fenton water treatment process. This study fabricates a polytetrafluoroethylene (PTFE) coated graphite felt cathode with a polydimethylsiloxane (PDMS) damp-proof coating to generate H O in a flow-through system without an external oxygen supply. We evaluated the effect of PDMS content, current, flow rate, and pH on H O production. PDMS coating inhibits electrowetting to extend the longevity of the modified graphite felt for electrogeneration of H O . However, increasing PDMS content can decrease H O production due to reduction of active sites on the graphite felt. Graphite felt electrodes (surface area = 14.5 cm ) coated with 500 mg of PDMS can generate 10 mg/L of H O under a flow rate of 3 mL/min with only 2% production reduction after 24-hour use. This modified graphite felt has better performance in a neutral or alkaline environment than in an acidic condition. Up to 38.5 mg/L of H O will be generated at optimum current (120 mA) at the flow rate of 3 mL/min. Increasing the flow rate decreases the concentration of H O in the electrolyte but enhances total production after 145 mins.
ISSN:2213-2929