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Title: Importance of carbon structure for nitrogen and sulfur co-doping to promote superior ciprofloxacin removal via peroxymonosulfate activation
Authors: Mohamed Faisal Gasim
Veksha, Andrei
Lisak, Grzegorz
Low, Siew-Chun
Hamidon, Tuan Sherwyn
M. Hazwan Hussin
Oh, Wen-Da
Keywords: Engineering::Civil engineering
Issue Date: 2023
Source: Mohamed Faisal Gasim, Veksha, A., Lisak, G., Low, S., Hamidon, T. S., M. Hazwan Hussin & Oh, W. (2023). Importance of carbon structure for nitrogen and sulfur co-doping to promote superior ciprofloxacin removal via peroxymonosulfate activation. Journal of Colloid and Interface Science, 634, 586-600.
Journal: Journal of Colloid and Interface Science
Abstract: Herein, five N, S-co-doped carbocatalysts were prepared from different carbonaceous precursors, namely sawdust (SD), biochar (BC), carbon-nanotubes (CNTs), graphite (GP), and graphene oxide (GO) and compared. Generally, as the graphitization degree increased, the extent of N and S doping decreased, graphitic N configuration is preferred, and S configuration is unaltered. As peroxymonosulfate (PMS) activator for ciprofloxacin (CIP) removal, the catalytic performance was in order: NS-CNTs (0.037 min-1) > NS-BC (0.032 min-1) > NS-rGO (0.024 min-1) > NS-SD (0.010 min-1) > NS-GP (0.006 min-1), with the carbonaceous properties, rather than the heteroatoms content and textural properties, being the major factor affecting the catalytic performance. NS-CNTs was found to have the supreme catalytic activity due to its remarkable conductivity (3.38 S m-1) and defective sites (ID/IG = 1.28) with high anti-interference effect against organic and inorganic matter and varying water matrixes. The PMS activation pathway was dominated by singlet oxygen (1O2) generation and electron transfer regime between CIP and PMS activated complexes. The CIP degradation intermediates were identified, and a degradation pathway is proposed. Overall, this study provides a better understanding of the importance of selecting a suitable carbonaceous platform for heteroatoms doping to produce superior PMS activator for antibiotics decontamination.
ISSN: 0021-9797
DOI: 10.1016/j.jcis.2022.12.072
Schools: School of Civil and Environmental Engineering 
Research Centres: Residues and Resource Reclamation Centre 
Nanyang Environment and Water Research Institute 
Rights: © 2022 Elsevier Inc. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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