镁铁氧体-壳聚糖-CaAl 纳米杂化材料对氟的高效去除：响应面优化、动力学和等温线研究。
Enhanced fluoride removal over MgFeO-chitosan-CaAl nanohybrid: Response surface optimization, kinetic and isotherm study.
机构信息
Department of Environmental Engineering, Bushehr Branch, Islamic Azad University, Bushehr, Iran.
School of Public Health, Shahroud University of Medical Sciences, Shahroud, Iran.
出版信息
Int J Biol Macromol. 2020 Apr 1;148:574-590. doi: 10.1016/j.ijbiomac.2020.01.143. Epub 2020 Jan 16.
In this work an effective adsorption route was developed for fluoride removal from aqueous solution. For this purpose MgFeO, MgFeO-chitosan and a three component nanocomposite of were synthesized and used. Characterization of the sorbents was performed with FESEM, TEM, FTIR, BET, VSM, SEM mapping and XRD techniques. Effective parameters on the adsorption process such as pH, contact time, adsorbent dosage and fluoride concentration was optimized by response surface methodology (RSM) using Box-Behnken design (BBD). Results showed that solution pH is a significant factor in fluoride adsorption with all adsorbents. However, adsorbent dosage was a significant factor when MgFeO-chitosan and three component adsorbents are employed. Kinetic study was performed based on pseudo-first order, pseudo-second order, intraparticle diffusion and Elovich model and results confirmed fluoride adsorption followed the pseudo-second order model. Isotherm study was studied at two concentration ranges of 0.5-10 mg/L and 10-100 mg/L of fluoride ions. Results showed that adsorption process followed Langmuir model with capacity of 263.15 mg/g. Regeneration was performed with NaOH solution (0.1 mol/L). It was found that removal percentage is in the range of 91-73% in five cycles of adsorption and regeneration.
在这项工作中，开发了一种从水溶液中去除氟化物的有效吸附途径。为此，合成了 MgFeO、MgFeO-壳聚糖和三种成分的纳米复合材料，并进行了研究。采用 FESEM、TEM、FTIR、BET、VSM、SEM 映射和 XRD 技术对吸附剂进行了表征。采用响应面法（RSM），通过 Box-Behnken 设计（BBD）优化了吸附过程的有效参数，如 pH 值、接触时间、吸附剂用量和氟化物浓度。结果表明，对于所有吸附剂，溶液 pH 值是氟吸附的重要因素。然而，当使用 MgFeO-壳聚糖和三种成分的吸附剂时，吸附剂用量是一个重要因素。基于伪一级、伪二级、内扩散和 Elovich 模型进行了动力学研究，结果证实氟化物吸附遵循伪二级模型。在两个氟离子浓度范围（0.5-10 mg/L 和 10-100 mg/L）下进行了等温线研究。结果表明，吸附过程遵循 Langmuir 模型，其容量为 263.15 mg/g。采用 0.1 mol/L 的 NaOH 溶液进行了再生。结果表明，在 5 次吸附和再生循环中，去除率在 91-73%的范围内。
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