Electroactive magnetic microparticles for the selective elimination of cesium ions in the wastewater
Electroactive magnetic microparticles for the selective elimination of cesium ions in the wastewater
复制标题
用于选择性消除废水中铯离子的电活性磁性微粒
DOI：
10.1016/j.envres.2020.109474
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发表时间：
2020-06-01
影响因子：
8.3
通讯作者：
Guan, Guoqing
中科院分区：
文献类型：
--
作者：
Wang, Peifen;Zheng, Junlan;Guan, Guoqing
为了提高废水处理中铯离子的去除效率和可操作性，开发了一种新型的电化学切换离子交换（ESIX）技术，该技术采用电活性普鲁士蓝（PB）基磁性微粒（PB@Fe3O4微粒）作为吸附材料，其粒径在300-900 nm之间。采用扫描电子显微镜（SEM）、透射电子显微镜（TEM）、傅里叶变换红外光谱（FT-IR）、X射线衍射（XRD）和热重分析（TGA）对PB@Fe3O4微粒进行了表征。结果表明，PB能很好地包覆在Fe 3 O 4微球表面，使其易于吸附在磁性电极基底上，用于Cs+离子的电化学吸附。PB/Fe 3 O 4电化学吸附Cs+的时间小于10 min，最大吸附容量为16.13 mg/g，Cs+的分配系数（KD）高达3938。PB@Fe3O4微粒的电化学吸附行为符合Freundlich吸附等温式和准二级动力学模型。预计这种使用PB@Fe3O4微粒的ESIX技术可以应用于实际过程中从铯污染溶液中分离和回收稀Cs+离子。
To improve operability as well as the removal efficiency for cesium ions in the wastewater treatment, a novel electrochemically switched ion exchange (ESIX) technique by using electroactive Prussian-blue(PB)-based magnetic microparticles (PB@Fe3O4 microparticle) with different uniform particle sizes in the range of 300-900 nm as the adsorption materials was developed. The obtained PB@Fe3O4 microparticle were characterized by Scanning electron microscopy (SEM), Transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and Thermogravimetric analysis (TGA). It is found that the PB can be well coated on the surface of Fe3O4 microsphere, which can be easily adsorbed on the magnetic electrode substrate for the electrochemical adsorption of Cs+ ions. Electrochemical adsorption of 97% Cs+ on PB/Fe3O4 was achieved in less than 10 min, and the maximum adsorption capacity was 16.13 mg/g, and the distribution coefficient (KD) of Cs+ ions reached as high as 3938. In addition, the electrochemical adsorption behavior of PB@Fe3O4 microparticle fitted well with the Freundlich adsorption isotherm and the Pseudo-second-order kinetic models. It is expected that such an ESIX technique using PB@Fe3O4 microparticle can be applied for the separation and recovery of dilute Cs+ ions from cesium-contaminated solution in a practical process.