Adsorption Studies of Waterborne Trihalomethanes Using Modified Polysaccharide Adsorbents

Molecules

Rui Guo¹  LeeD. Wilson¹  Lalita Bharadwaj² 

[1] Department of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon, SK S7N 0X2, Canada;Department of Community Health and Epidemiology, University of Saskatchewan, Health Sciences Building, 107 Wiggins Road, Saskatoon, SK S7N 5E5, Canada;

关键词: trihalomethanes;    adsorption isotherms;    β-cyclodextrin;    chitosan;    polymers;    fractionation;   

DOI  :  10.3390/molecules26051431

来源: DOAJ

【 摘 要 】

The adsorptive removal of trihalomethanes (THMs) from spiked water samples was evaluated with a series of modified polysaccharide adsorbents that contain β-cylodextrin or chitosan. The uptake properties of these biodegradable polymer adsorbents were evaluated with a mixture of THMs in aqueous solution. Gas chromatography employing a direct aqueous injection (DAI) method with electrolytic conductivity detection enabled quantification of THMs in water at 295 K and at pH 6.5. The adsorption isotherms for the polymer-THMs was evaluated using the Sips model, where the monolayer adsorption capacities ranged between 0.04 and 1.07 mmol THMs/g for respective component THMs. Unique adsorption characteristics were observed that vary according to the polymer structure, composition, and surface chemical properties. The modified polysaccharide adsorbents display variable molecular recognition and selectivity toward component THMs in the mixed systems according to the molecular size and polarizability of the adsorbates.

【 授权许可】

Unknown