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Adsorption of Single-Ring Organic Compounds to Wood Charcoals Prepared under Different Thermochemical Conditions
Abstract
Environmental black carbon (BC) is believed to be an important adsorbent of organic pollutants. In this study, we examined the effects of changes in surface properties and adsorbate structure. A series of apolar compounds (cyclohexane, 1,2-dichlorobenzene, 1,4-xylene, 1,2,3,5-tetramethylbenzene, 1,3,5-triethylbenzene) and a series of polar compounds (o-cresol, 4-nitrotoluene, 2,4-dinitrotoluene, and 2,4,6-trinitrotoluene) were sorbed from aqueous solution to maple wood char prepared under five thermochemical conditions. Two chars were prepared in air at 340 degrees C (C340) and 400 degrees C (C400). A subsample of C400 was treated with H2 in the presence of a supported Pt catalyst at 500 degrees C (C400-H) to remove surface O. Another was treated under N2 at 500 degrees C (C400-N) to serve as a control for C400-H. The reduced C400-H was further oxidized in air at 340 degrees C to reintroduce O (C400-H-A). The five chars vary in O content (26.1, 22.3, 4.2, 20.8, and 18.6 wt %, respectively) but show only minor differences in surface area and pore size distribution on the basis of N2 and CO2 adsorption analysis. These chars provide a basis for rationalizing sorption intensity as a function of sorbate molecular structure and surface chemistry. The following conclusions were drawn. (1) Polar interactions with surface O functional groups are not a significant driving force for adsorption. (2) When isotherms are adjusted for solute hydrophobicity (n-hexdecane-water partition coefficient), sorption intensity of the polar compounds is greater than that of the apolar compounds, possibly because of pi-pi EDA interactions of the polar compounds with the basal plane of the graphene sheets. (3) The largest test compounds show steric exclusion from a portion of the adsorption space available to the other compounds. (4) Removal of O functionality by hydrogenation enhances sorption intensity of polar and apolar compounds, alike by reducing competitive adsorption by water molecules.
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Metadata
- Authors
- Zhu, D., Kwon, S., & Pignatello, J. J.
- Venue
- Environmental Science & Technology
- Publisher
- American Chemical Society (ACS)
- Published
- 2005-04-20
- Volume
- 39
- Issue
- 11
- Pages
- 3990-3998
- ISSN
- 0013-936X (ISSN-L)
- 1520-5851
- OpenAlex
- W1974526453
- Cited by
- 272
- References
- 18
- FWCI
- 7.78
- Type
- journal article
- Language
- en
- Open access
- closed
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