Predicting the Sorption of Aromatic Acids to Noncarbonized and Carbonized Sorbents
- Autor(en)
- Gabriel Sigmund, Huichao Sun, Thilo Hofmann, Melanie Kah
- Abstrakt
Approaches based on the octanol-water partition coefficient are commonly used to describe sorption of neutral organic compounds in environmental systems, but they are not suitable for organic acids, which can dissociate to form anions. We here investigate the applicability of an alternative approach based on the pH-dependent distribution ratio (D
OW) to describe sorption of aromatic acids to sorbents representing different degrees of carbonization. Sorption isotherms for four structurally similar acids ((2,4-dichlorophenoxy)acetic acid (2,4-D), 4-chloro-2-15 methylphenoxy)acetic acid (MCPA), 4-(2,4-dichlorophenoxy)butanoic16 acid (2,4-DB), and 5-chloro-2-(2,4-dichlorophenoxy)phenol (triclosan)) were measured for 15 sorbents: fresh and carbonized wood shavings, pig manure, sewage sludge, carbon nanotubes, and activated carbon. Dissociation greatly affected the sorption of all acids. Sorption coefficients measured in the high pH range indicated that sorption of the anions ranged over several orders of magnitude and should not be neglected. Sorption trends for all sorbates and carbonized sorbents could be very well described by a single regression equation that included D
OW of the sorbate and the specific surface area of the sorbent (R
2 > 0.89). (Chemical Equation Presented).
- Organisation(en)
- Externe Organisation(en)
- Universität Wien
- Journal
- Environmental Science & Technology
- Band
- 50
- Seiten
- 3641-3648
- Anzahl der Seiten
- 8
- ISSN
- 0013-936X
- DOI
- https://doi.org/10.1021/acs.est.5b06033
- Publikationsdatum
- 2016
- Peer-reviewed
- Ja
- ÖFOS 2012
- 104023 Umweltchemie, 104002 Analytische Chemie, 105906 Umweltgeowissenschaften
- Schlagwörter
- ASJC Scopus Sachgebiete
- Allgemeine Chemie, Environmental Chemistry
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/3f967255-6620-489e-9f52-7b7a8597ca8d