Selective adsorption and separation of Cs(I) from salt lake brine by a novel surface magnetic ion-imprinted polymer
Selective adsorption and separation of Cs(I) from salt lake brine by a novel surface magnetic ion-imprinted polymer
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DOI：
10.1080/01932691.2016.1261361
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发表时间：
2017-03
影响因子：
2.2
通讯作者：
L. Yang;Shengfang Li;Chunyan Sun
中科院分区：
文献类型：
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作者：
L. Yang;Shengfang Li;Chunyan Sun
摘要制备了一种新型的Cs（I）磁性离子印迹聚合物（Cs（I）-MIIP），用于选择性吸附分离盐湖卤水中的Cs（I）。以Fe3O4@SiO2为载体，Cs（I）为模板离子，羧甲基壳聚糖为功能单体。采用红外光谱、X射线衍射、能谱、扫描电镜、热重分析、振动样品磁强计等对产物进行了表征。在最佳吸附条件下，对Cs（I）-MIIP的最大吸附量为36.15 mg·g-1。采用准一级动力学模型和Freundlich吸附等温线模型对Cs（I）在Cs（I）-MIIP上的吸附过程进行了预测。对Cs（I）/Li（I）、Cs（I）/Na（I）、Cs（I）/K（I）、Cs（I）/Rb（I）和Cs（I）/Sr（II）二元溶液的相对选择性系数（k′）分别为24.995、1.73、1.43、4.83和1.63，均高于NIP。将Cs（I）-MIIP成功应用于青海盐湖卤水中Cs（I）的富集分离，获得了满意的Cs（I）回收率。图形摘要
ABSTRACT A new Cs(I) magnetic ion-imprinted polymer (Cs(I)-MIIP) aimed at the selective adsorption and separation of Cs(I) from salt lake brine was prepared. The Fe3O4@SiO2 was used as supporter, Cs(I) as template ion, and carboxymethyl chitosan as functional monomer. The product was characterized by Fourier transform infrared spectra, XRD, energy-dispersive spectrometry, scanning electron microcopy, thermogravimetric analysis, and vibrating sample magnetometer. The adsorption of the Cs(I)-MIIP in solution was investigated, which indicated the maximum adsorption capacity was 36.15 mg·g−1 under the optimum conditions. The pseudo-first-order kinetic model and the Freundlich isotherm model were applied to predict the adsorption process of Cs(I) onto Cs(I)-MIIP. Selectivity experiments showed that the relative selectivity coefficient (k′) were 24.995, 1.73, 1.43, 4.83, and 1.63 to Cs(I)/Li(I), Cs(I)/Na(I), Cs(I)/K(I), Cs(I)/Rb(I), and Cs(I)/Sr(II) binary solutions, higher than those of NIP, respectively. Furthermore, the Cs(I)-MIIP was successfully applied to the enrichment and separation of Cs(I) from the salt lake brine of Qinghai, with satisfactory Cs(I) recovery rates. GRAPHICAL ABSTRACT