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HERO ID
3453059
Reference Type
Journal Article
Title
Micropore clogging by leachable pyrogenic organic carbon: A new perspective on sorption irreversibility and kinetics of hydrophobic organic contaminants to black carbon
Author(s)
Wang, B; Zhang, W; Li, H; Fu, H; Qu, X; Zhu, D
Year
2017
Is Peer Reviewed?
Yes
Journal
Environmental Pollution
ISSN:
0269-7491
EISSN:
1873-6424
Volume
220
Issue
Pt B
Page Numbers
1349-1358
Language
English
PMID
27838059
DOI
10.1016/j.envpol.2016.10.100
Web of Science Id
WOS:000390732300063
URL
http://
://WOS:000390732300063
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Abstract
Black carbon (BC) plays a crucial role in sequestering hydrophobic organic contaminants in the environment. This study investigated key factors and mechanisms controlling nonideal sorption (e.g., sorption irreversibility and slow kinetics) of model hydrophobic organic contaminants (nitrobenzene, naphthalene, and atrazine) by rice-straw-derived BC. After removing the fraction of leachable pyrogenic organic carbon (LPyOC) (referring to composites of dissoluble non-condensed organic carbon and associated mineral components) with deionized water or 0.5 M NaOH, sorption of these sorbates to BC was enhanced. The sorption enhancement was positively correlated with sorbate molecular size in the order of atrazine > naphthalene > nitrobenzene. The removal of LPyOC also accelerated sorption kinetics and reduced sorption irreversibility. These observations were attributed to increased accessibility of BC micropores initially clogged by the LPyOC. Comparison of BC pore size distributions before and after atrazine sorption further suggested that the sorbate molecules preferred to access the micropores that were more open, and the micropore accessibility was enhanced by the removal of LPyOC. Consistently, the sorption of nitrobenzene and atrazine to template-synthesized mesoporous carbon (CMK3), a model sorbent with homogeneous pore structures, showed decreased kinetics, but increased irreversibility by impregnating sorbent pores with surface-grafted alkylamino groups and by subsequent loading of humic acid. These findings indicated an important and previously unrecognized role of LPyOC (i.e., micropore clogging) in the nonideal sorption of organic contaminants to BC.
Keywords
Black carbon (BC); Leachable pyrogenic organic carbon (LPyOC); Pore clogging; Sorption irreversibility; Sorption kinetics; article; atrazine; correlation; humic acids; hydrophobicity; micropores; molecular weight; naphthalene; pollution; porosity; porous media; sodium hydroxide; sorbates; sorption
Tags
IRIS
•
Naphthalene
Database searches - Jan 2017 (private)
New Jan 2017 (private)
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PubMed
Toxline
Combined data set
Data set for title/abstract screening
Excluded - PECO criteria not met (TIAB)
Other
•
Naphthalene (2021 Evidence mapping publication)
Database searches - Jan 2017 (private)
New Jan 2017 (private)
Database Searches
PubMed
Toxline
Combined data set
Data set for title/abstract screening
Excluded – PECO criteria not met
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