Hydrophilic divinylbenzene for equilibrium sorption of emerging organic contaminants in aquatic matrices

Steve Huysman, Francis Vanryckeghem, Ellen De Paepe, Foppe Smedes, Simon A Haughey, Christopher T Elliott, Kristof Demeestere, Lynn Vanhaecke

Research output: Contribution to journalArticle

Abstract

Hydrophilic divinylbenzene (DVB) (Bakerbond™) has surfaced as a promising sorbent for active sampling of analytes from aqueous matrices over a very broad polarity range. Given this, hydrophilic DVB may likewise offer potential for passive sampling, if sorbent-water partitioning coefficients (Ksw) were to be available. In this work, static exposure batch experiments were performed to quantitatively study the equilibrium sorption of 131 environmentally relevant organic contaminants (P values ranging from -1.30 to 9.85) on hydrophilic DVB. The superior affinity of hydrophilic DVB for compounds with a broad polarity range was confirmed by functional FTIR and Raman characterization, demonstrating the presence of carboxyl moieties. Concentration effects were studied by increasing compound concentrations in mixture experiments, and resulted for the steroidal EDCs in higher Ksw, while lower Ksw were obtained for the (alkyl)phenols, personal care products, pesticides, pharmaceuticals and phthalates. Nevertheless, Ksw remained constant in said design for equilibrium water concentrations at environmentally relevant seawater levels. Analysis of thermodynamic parameters (change in enthalpy, entropy and Gibbs free energy) revealed the nature of the main partitioning processes. While polar (log P < 4) compounds were mainly served by physisorption, non-polar (log P > 4) compounds also exhibited binding by chemisorption. In conclusion, this research facilitates the future application of hydrophilic DVB for active as well as passive sampling in the analysis of organic contaminants for monitoring purposes but also for toxicity testing.

Original languageEnglish
JournalEnvironmental science & technology
Early online date04 Aug 2019
DOIs
Publication statusEarly online date - 04 Aug 2019

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