新型改性磁性壳聚糖粒子的合成及其对 Cr(VI)的吸附性能。
Synthesis of novel modified magnetic chitosan particles and their adsorption performance toward Cr(VI).
机构信息
Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing 400045, China; National Centre for International Research of Low-Carbon and Green Buildings, Chongqing University, Chongqing 400045, China.
Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, State Ministry of Education, Chongqing University, Chongqing 400045, China; National Centre for International Research of Low-Carbon and Green Buildings, Chongqing University, Chongqing 400045, China.
出版信息
Bioresour Technol. 2018 Nov;267:1-8. doi: 10.1016/j.biortech.2018.06.113. Epub 2018 Jul 6.
Novel adsorbents, poly([2-(methacryloxy)ethyl]trimethylammonium chloride) modified magnetic chitosan particles (DMCPs), were synthesized via free radical polymerization and applied to adsorb Cr(VI) from aqueous solution. The effects of pH (2-11), Cr(VI) concentration (10-200 mg/L) and contact time (0-420 min) on the adsorption performance were evaluated. The results showed that the adsorption capacity of DMCPs was much larger than that of magnetic chitosan particles (MCPs) in the examined pH range and decreased with Cl concentration increasing, indicating that electrostatic interaction and ion exchange are the governing mechanisms of Cr(VI) adsorption by DMCPs. The Langmuir isotherm model and pseudo-second-order kinetic model fitted the experimental data well. The maximum adsorption capacity of DMCPs is 153.85 mg/g. Besides, Cr(VI)-loaded DMCPs could be easily separated and efficiently regenerated. Therefore, DMCPs are promising candidates for Cr(VI) adsorption owing to their excellent performance in a wide pH range, easy separation and good reusability.
新型吸附剂，聚[2-（甲基丙烯酰氧）乙基]三甲基氯化铵改性磁性壳聚糖颗粒（DMCPs），通过自由基聚合合成，并应用于从水溶液中吸附 Cr(VI)。考察了 pH（2-11）、Cr(VI)浓度（10-200mg/L）和接触时间（0-420min）对吸附性能的影响。结果表明，在考察的 pH 范围内，DMCPs 的吸附容量远大于磁性壳聚糖颗粒（MCPs），且随着 Cl 浓度的增加而降低，表明静电相互作用和离子交换是 DMCPs 吸附 Cr(VI)的主要机制。Langmuir 等温模型和拟二级动力学模型很好地拟合了实验数据。DMCPs 的最大吸附容量为 153.85mg/g。此外，负载 Cr(VI)的 DMCPs 易于分离且可有效再生。因此，DMCPs 由于其在较宽 pH 范围内具有良好的性能、易于分离和良好的可重复使用性，是 Cr(VI)吸附的理想候选材料。
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