Long-Term Uptake of Phenol-Water Vapor Follows Similar Sigmoid Kinetics on Prehydrated Organic Matter- and Clay-Rich Soil Sorbents
| Autor: | Mikhail Borisover, Marcos Lado, Nadezhda Bukhanovsky |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Sorbent
010501 environmental sciences 01 natural sciences Chemical reaction Soil chemistry.chemical_compound 0404 agricultural biotechnology Colon Sigmoid Soil Pollutants Environmental Chemistry Leonardite Humic acid Phenol Organic matter Relative humidity 0105 earth and related environmental sciences chemistry.chemical_classification Water 04 agricultural and veterinary sciences General Chemistry 040401 food science Kinetics Steam chemistry Environmental chemistry Clay Gravimetric analysis Aluminum Silicates Adsorption |
| Zdroj: | Environmental Science & Technology. 51:10403-10412 |
| ISSN: | 1520-5851 0013-936X |
| DOI: | 10.1021/acs.est.7b01558 |
| Popis: | Typical experimental time frames allowed for equilibrating water-organic vapors with soil sorbents might lead to overlooking slow chemical reactions finally controlling a thermodynamically stable state. In this work, long-term gravimetric examination of kinetics covering about 4000 h was performed for phenol-water vapor interacting with four materials pre-equilibrated at three levels of air relative humidity (RHs 52, 73, and 92%). The four contrasting sorbents included an organic matter (OM)-rich peat soil, an OM-poor clay soil, a hydrophilic Aldrich humic acid salt, and water-insoluble leonardite. Monitoring phenol-water vapor interactions with the prehydrated sorbents, as compared with the sorbent samples in phenol-free atmosphere at the same RH, showed, for the first time, a sigmoid kinetics of phenol-induced mass uptake typical for second-order autocatalytic reactions. The apparent rate constants were similar for all the sorbents, RHs and phenol activities studied. A significant part of sorbed phenol resisted extraction, which was attributed to its abiotic oxidative coupling. Phenol uptake by peat and clay soils was also associated with a significant enhancement of water retention. The delayed development of the sigmoidal kinetics in phenol-water uptake demonstrates that long-run abiotic interactions of water-organic vapor with soil may be overlooked, based on short-term examination. |
| Databáze: | OpenAIRE |
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