Identifying the function of activated carbon surface chemical properties in the removability of two common odor compounds.
2-Methylisobornel
Dimethyl disulfide
Odor compounds
PAC properties
adsorption
Journal
Water research
ISSN: 1879-2448
Titre abrégé: Water Res
Pays: England
ID NLM: 0105072
Informations de publication
Date de publication:
01 Jul 2020
01 Jul 2020
Historique:
received:
31
12
2019
revised:
17
03
2020
accepted:
03
04
2020
pubmed:
7
5
2020
medline:
26
5
2020
entrez:
7
5
2020
Statut:
ppublish
Résumé
In this study, the adsorption capacities of two common odor compounds, 2-methylisoborneol (2-MIB) and dimethyl disulfide (DMDS), onto nine common types of powdered activated carbon (PAC) were comprehensively compared to screen the critical surface chemical properties affecting the adsorption performance. The results showed that the adsorption capacities of all the PACs for DMDS were generally lower than those for 2-MIB. The Spearman's rank correlation analysis indicated that the adsorption capacity for 2-MIB did not have any correlation with the PAC surface sites, while the DMDS adsorption capacity was positively related to the number of basic sites. The effect of the PAC basic sites on the DMDS adsorption was further verified by density functional theory (DFT) calculation in two adsorption modes (facial mode and edge mode). The graphene structure in the edge mode was the most favorable for DMDS adsorption with the lowest adsorption enthalpy, followed by the ketone-doped structure under the facial mode. An independent gradient model indicated that van der Waals forces were dominant in the DMDS adsorption. Moreover, thermal modification was conducted to further prove the relationship between the basic sites and the DMDS adsorption. After thermal modification, the PAC with more basic sites and graphene structures was found to be more effective for DMDS adsorption. Overall, this study could offer guidance for water treatment plants with respect to the selection of PAC to solve the odor problems caused by various compounds (e.g., DMDS or 2-MIB), and the modification of PAC, aiming at more efficient odor removal.
Identifiants
pubmed: 32375110
pii: S0043-1354(20)30334-1
doi: 10.1016/j.watres.2020.115797
pii:
doi:
Substances chimiques
Water Pollutants, Chemical
0
Charcoal
16291-96-6
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
115797Informations de copyright
Copyright © 2020 Elsevier Ltd. All rights reserved.
Déclaration de conflit d'intérêts
Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.