Peroxymonosulfate activation by nitrogen-doped sludge from drinking water treatment for organic pollutants removal
Drinking water treatment sludge (WTS) was used to produce nitrogen-doped (N-doped) catalysts. Urea and the one-step pyrolysis method were used to prepare the catalysts, which were used to activate peroxymonosulfate (PMS) and degrade methyl orange (MO) in water. The NWTS-1 catalyst synthesized using...
- Autores:
-
Castro Jiménez, Camilo César
Saldarriaga Molina, Julio César
García Aristizábal, Edwin Fabián
Torres Palma, Ricardo Antonio
Acelas Soto, Nancy Yamile
- Tipo de recurso:
- Article of investigation
- Fecha de publicación:
- 2025
- Institución:
- Universidad de Antioquia
- Repositorio:
- Repositorio UdeA
- Idioma:
- eng
- OAI Identifier:
- oai:bibliotecadigital.udea.edu.co:10495/48265
- Acceso en línea:
- https://hdl.handle.net/10495/48265
- Palabra clave:
- Oxidación-Reducción
Oxidation-Reduction
Tratamiento del agua
Water treatment
Catalizadores
Catalysts
Agua potable
Drinking water
https://id.nlm.nih.gov/mesh/D010084
ODS 6: Agua limpia y saneamiento. Garantizar la disponibilidad y la gestión sostenible del agua y el saneamiento para todos
- Rights
- openAccess
- License
- http://creativecommons.org/licenses/by-nc-nd/4.0/
| Summary: | Drinking water treatment sludge (WTS) was used to produce nitrogen-doped (N-doped) catalysts. Urea and the one-step pyrolysis method were used to prepare the catalysts, which were used to activate peroxymonosulfate (PMS) and degrade methyl orange (MO) in water. The NWTS-1 catalyst synthesized using solid urea at a 1:1 mass ratio, demonstrating the most effective synergistic interaction with PMS for MO degradation. The NWTS-1/PMS system effectively oxidized MO, achieving over 98 % MO removal in 10 min, with a pseudo-first-order rate removal of 0.74 min− 1 , a low consumption of PMS (0.5 mM), and a low catalyst loading (0.5 g L− 1 ). The presence of Cl− enhanced degradation, while HCO₃ − and humic acid inhibited it. Quenching tests indicated that the superoxide anion radical (O2 •− ) (radical pathway) and singlet oxygen ( 1 O2) (nonradical pathway) play a crucial role in MO degradation. The leading active site for PMS activation was identified as graphitic-N. Also, NWTS-1 showed no significant efficiency loss after five consecutive reuse cycles. Additionally, the NWTS-1/PMS treatment showed significant MO removals (>90 %) after 15 min in both municipal and textile wastewaters. This study highlights a sustainable approach to valorise drinking water treatment sludge by producing N-doped catalysts with potential applications in water pollution control. |
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