Peroxymonosulfate activation by nitrogen-doped sludge from drinking water treatment for organic pollutants removal
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Elsevier Ltd
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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 (O<inf>2</inf>•−) (radical pathway) and singlet oxygen (1O<inf>2</inf>) (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. © 2025 Elsevier B.V., All rights reserved.
Palabras clave
Catalytic Oxidation, Drinking Water Treatment Sludge, Nitrogen Doping, Peroxymonosulfate Activation, Water Treatment