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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。
Chitosan was modified by ferric chloride to make iron-loaded chitosan particles (Fe-CTS) to remove fluoride from polluted water. The effects of reaction time, F-initial content, temperature, p H and coexisting ions on the adsorption and removal of fluoride in Fe-CTS were investigated. The quasi-second-order kinetic model, Langmuir and Freundlich adsorption isotherm models were used to simulate the experimental data Together The results showed that the adsorption and desorption of Fe-CTS were less affected by the temperature and p H, while the CO 2 2- in the coexisting ions had the most significant effect on the adsorption. The experimental data and quasi-second-order kinetic model fit a higher degree, indicating that the adsorption process of chemical adsorption rate control step. The adsorption process is more consistent with the Langmuir adsorption isotherm model, indicating that the surface of the Fe-CTS adsorbent is homogeneous, and the adsorption sites on the surface have the same adsorption capacity for F-. When the adsorbent surface reaches the adsorption equilibrium, the adsorption equilibrium between the adsorbate molecules No interaction, and the adsorption process to monolayer adsorption.