铁负载壳聚糖颗粒吸附除氟研究

发布时间：2019-01-21 11:31

【摘要】：采用氯化铁对壳聚糖进行改性,制成铁负载壳聚糖颗粒(Fe-CTS)去除污染水中的氟化物。考察了反应时间、F-初始含量、温度、p H、共存离子等因素对Fe-CTS吸附除氟效果的影响,并采用准2级动力学模型、Langmuir和Freundlich吸附等温模型对实验数据进行拟合。结果表明,Fe-CTS吸附除氟过程受温度,p H影响较小;共存离子中CO32-对吸附过程影响最显著。实验数据与准2级动力学模型拟合程度较高,说明吸附过程中化学吸附为速率控制步骤。吸附过程更符合Langmuir吸附等温模型,说明Fe-CTS吸附剂表面呈均质性,表面上各吸附位点对F-的吸附能力相同,当吸附剂表面达到吸附饱和时吸附平衡,吸附质分子间无相互作用,且吸附过程以单层吸附为主。
[Abstract]:Iron loaded chitosan particles (Fe-CTS) were prepared by modifying chitosan with ferric chloride to remove fluoride from polluted water. The effects of reaction time, initial F- content and coexisting ions of, p H, on the adsorption and defluorination of Fe-CTS were investigated. The experimental data were fitted by quasi 2 order kinetic model, Langmuir and Freundlich adsorption isotherm model. The results showed that the adsorption and defluorination process of Fe-CTS was less affected by temperature, p H, and that of coexisting ions CO32- had the most significant effect on the adsorption process. The experimental data fit well with the quasi 2 order kinetic model, which indicates that chemisorption is the rate control step in the adsorption process. The adsorption process is more in line with the Langmuir adsorption isotherm model, which indicates that the surface of Fe-CTS adsorbent is homogeneous, and the adsorption ability of all adsorption sites on the surface is the same. When the adsorbent surface reaches adsorption saturation, the adsorption equilibrium is obtained. There is no interaction between adsorbate molecules, and the adsorption process is mainly monolayer adsorption.
【作者单位】： 中国地质大学(北京)水资源与环境学院;
【基金】：国家自然科学基金(21407129)
【分类号】：O647.3;R123.6

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