改性多糖吸附剂对水中三卤甲烷的吸附研究。
Adsorption Studies of Waterborne Trihalomethanes Using Modified Polysaccharide Adsorbents.
机构信息
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.
出版信息
Molecules. 2021 Mar 6;26(5):1431. doi: 10.3390/molecules26051431.
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.
采用一系列含有β-环糊精或壳聚糖的改性多糖吸附剂评价了水中三卤甲烷（THMs）的吸附去除效果。采用直接水相进样（DAI）法和电导率检测的气相色谱法，在 295 K 和 pH 6.5 条件下对水中的 THMs 进行了定量分析。采用 Sips 模型评价了聚合物-THMs 的吸附等温线，各组分 THMs 的单层吸附容量在 0.04 到 1.07 mmol THMs/g 之间。根据聚合物结构、组成和表面化学性质，观察到独特的吸附特性随聚合物的变化而变化。根据吸附物的分子大小和极化率，改性多糖吸附剂在混合体系中对各组分 THMs 表现出可变的分子识别和选择性。
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