NDLI: Prediction of the sorption capacities and affinities of organic chemicals by XAD-7.

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Prediction of the sorption capacities and affinities of organic chemicals by XAD-7.

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Prediction of the sorption capacities and affinities of organic chemicals by XAD-7.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Wei, Wei Qi, Long Lin, Daohui Yang, Kun Wu, Wenhao
Description	Country affiliation: China Author Affiliation: Yang K ( Department of Environmental Science, Zhejiang University, 310058, Hangzhou, China. kyang@zju.edu.cn.); Qi L ( Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, 310058, Hangzhou, China. kyang@zju.edu.cn.); Wei W ( Department of Environmental Science, Zhejiang University, 310058, Hangzhou, China.); Wu W ( Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, 310058, Hangzhou, China.); Lin D ( Department of Environmental Science, Zhejiang University, 310058, Hangzhou, China.)
Abstract	Macro-porous resins are widely used as adsorbents for the treatment of organic contaminants in wastewater and for the pre-concentration of organic solutes from water. However, the sorption mechanisms for organic contaminants on such adsorbents have not been systematically investigated so far. Therefore, in this study, the sorption capacities and affinities of 24 organic chemicals by XAD-7 were investigated and the experimentally obtained sorption isotherms were fitted to the Dubinin-Ashtakhov model. Linear positive correlations were observed between the sorption capacities and the solubilities (SW) of the chemicals in water or octanol and between the sorption affinities and the solvatochromic parameters of the chemicals, indicating that the sorption of various organic compounds by XAD-7 occurred by non-linear partitioning into XAD-7, rather than by adsorption on XAD-7 surfaces. Both specific interactions (i.e., hydrogen-bonding interactions) as well as nonspecific interactions were considered to be responsible for the non-linear partitioning. The correlation equations obtained in this study allow the prediction of non-linear partitioning using well-known chemical parameters, namely SW, octanol-water partition coefficients (KOW), and the hydrogen-bonding donor parameter ( m). The effect of pH on the sorption of ionizable organic compounds (IOCs) could also be predicted by combining the correlation equations with additional equations developed from the estimation of IOC dissociation rates. The prediction equations developed in this study and the proposed non-linear partition mechanism shed new light on the selective removal and pre-concentration of organic solutes from water and on the regeneration of exhausted XAD-7 using solvent extraction.
ISSN	09441344
Issue Number	2
Volume Number	23
e-ISSN	16147499
Journal	Environmental Science and Pollution Research
Language	English
Publisher	Springer
Publisher Date	2016-01-01
Publisher Place	Germany
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Acrylic Resins Chemistry Organic Chemicals Polystyrenes Adsorption Kinetics Models, Theoretical Solubility Water Water Pollutants, Chemical Journal Article Research Support, Non-u.s. Gov't Discipline Environmental Science Discipline Environmental Chemistry
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Health, Toxicology and Mutagenesis Pollution Medicine

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