Abstract
The electrochemical oxidation of diclofenac (DCF), a non-steroidal anti-inflammatory drug considered as an emerging pollutant (frequently detected in wastewater), was investigated on CNT, Pt/CNT and Ru/CNT modified electrodes based on Carbon Toray in aqueous media. The electroreactivity of DCF on these modified electrodes was studied using cyclic voltammetry and the kinetic parameters were calculated from the scan rate study. Cyclic voltammograms show several oxidation processes, which confirm the interaction between DCF and the catalyst surface necessary for direct oxidation processes. Constant potential electrolysis of DCF was carried out on carbon nanotubes (CNT) and metal supported CNT (M/CNT) modified electrodes, in 0.1 M NaOH and 0.1 M Na2CO3/NaHCO3buffer media. The highest DCF conversion (88% after 8 h of electrolysis) was found in carbonate buffer medium, for Ru/CNT, while the best carbon mineralization efficiency (corresponding to 48% of the oxidized DCF) was obtained on Pt/CNT modified electrode in 0.1 M NaOH medium. The products of the electrolyses were identified and quantified by HPLC-MS, GC-MS, HPLC-UV-RID and IC. The results show the presence of some low molecular weight carboxylic acids, confirming the cleavage of the aromatic rings during the oxidation process.
| Original language | English |
|---|---|
| Pages (from-to) | 12622-12633 |
| Number of pages | 12 |
| Journal | New Journal of Chemistry |
| Volume | 45 |
| Issue number | 28 |
| DOIs | |
| Publication status | Published - 28 Jul 2021 |
Bibliographical note
Publisher Copyright:© The Royal Society of Chemistry and the Centre National de la Recherche Scientifique 2021.
Funding
The authors thank FCT (Fundação para a Ciência e a Tecnolo-gia, Portugal) for the PhD grant of Marta Ferreira, and the financing of projects: PTDC/AAGTEC/5269/2014, Centre of Chemistry (UID-QUI/00686/2013 and UID/QUI/0686/2016), and LSRE-LCM (Base Funding – UIDB/50020/2020 of the Associate Laboratory LSRE-LCM – funded by national funds through FCT/ MCTES (PIDDAC)). This work has been developed under the scope of the projects BioTecNorte (operation NORTE-01-0145-FEDER-000004), supported by the Northern Portugal Regional Operational Programme (NORTE 2020), under the Portugal 2020 Partnership Agreement through the European Regional Development Fund (ERDF). The authors also thank TUBITAK (Türkiye Bilimsel ve Teknolojik Aras-tirma Kurumu, operation TUBITAK-2219) for the post-doctoral grant to Dr Sevgi Güney. The authors thank FCT (Fundação para a Ciência e a Tecnologia, Portugal) for the PhD grant of Marta Ferreira, and the financing of projects: PTDC/AAGTEC/5269/2014, Centre of Chemistry (UID-QUI/00686/2013 and UID/QUI/0686/2016), and LSRE-LCM (Base Funding - UIDB/50020/2020 of the Associate Laboratory LSRE-LCM - funded by national funds through FCT/MCTES (PIDDAC)). This work has been developed under the scope of the projects BioTecNorte (operation NORTE-01-0145-FEDER-000004), supported by the Northern Portugal Regional Operational Programme (NORTE 2020), under the Portugal 2020 Partnership Agreement through the European Regional Development Fund (ERDF). The authors also thank TUBITAK (Türkiye Bilimsel ve Teknolojik Araştirma Kurumu, operation TUBITAK-2219) for the post-doctoral grant to Dr Sevgi Güney.
| Funders | Funder number |
|---|---|
| Centre of Chemistry | UID/QUI/0686/2016, UID-QUI/00686/2013 |
| LSRE-LCM | |
| Northern Portugal Regional Operational Programme | |
| Fundação para a Ciência e a Tecnologia | PTDC/AAGTEC/5269/2014 |
| Türkiye Bilimsel ve Teknolojik Araştirma Kurumu | TUBITAK-2219 |
| Ministério da Ciência, Tecnologia e Ensino Superior | NORTE-01-0145-FEDER-000004 |
| European Regional Development Fund |
