State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, No.19, Xinjiekouwai Street, Haidian District, Beijing 100875, PR China.
State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, No.19, Xinjiekouwai Street, Haidian District, Beijing 100875, PR China; Xi'an High-Tech Institute, Xi'an 710025, PR China.
Sci Total Environ. 2022 Sep 10;838(Pt 4):156530. doi: 10.1016/j.scitotenv.2022.156530. Epub 2022 Jun 6.
The Prussian blue (PB) blending membranes are promising candidates for the removal of trace radionuclide Cs. Constructing a membrane with high flux and selectivity are challenging in its practical application. Here, a novel polyvinylidene fluoride (PVDF)-PB-graphene oxide (GO) modified membrane was fabricated via phase inversion for trace radionuclide cesium (Cs) removal from water. Attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) were used to analyze chemical composition and morphology of the membrane, and the properties in terms of water flux and Cs removal were studied under different PB dosage, pH and co-existing ions conditions. It was observed that the addition of GO improved the dispersion of PB, and the PVDF-PB-GO membrane presented the highest Cs removal efficiency (99.6 %) and water flux (1638.2 LMH/bar) at pH = 7 with 0.1 wt% GO and 5 wt% PB. In addition, Langmuir and pseudo-second-order kinetics models fitted well for Cs adsorption by the PVDF-PB-GO membrane, illustrating that the Cs was removed via chemical adsorption dominated by Fe(CN) defect sites of PB and the oxygen groups of GO. Furthermore, the membrane showed a significant selectivity and reusability towards trace radioactive cesium, even in the presence of excess co-existing ions and in real water, which strongly verified that the modified membrane had application potential.
普鲁士蓝（PB）混合膜是去除痕量放射性核素 Cs 的有前途的候选材料。在实际应用中，构建具有高通量和选择性的膜具有挑战性。在这里，通过相转化法制备了一种新型聚偏二氟乙烯（PVDF）-PB-氧化石墨烯（GO）修饰膜，用于从水中去除痕量放射性核素铯（Cs）。衰减全反射傅里叶变换红外光谱（ATR-FTIR）、X 射线光电子能谱（XPS）和扫描电子显微镜（SEM）用于分析膜的化学成分和形态，研究了不同 PB 用量、pH 值和共存离子条件下膜的水通量和 Cs 去除性能。结果表明，GO 的添加改善了 PB 的分散性，在 pH = 7 时，添加 0.1wt%GO 和 5wt%PB 的 PVDF-PB-GO 膜具有最高的 Cs 去除效率（99.6%）和水通量（1638.2LMH/bar）。此外，Langmuir 和拟二级动力学模型很好地拟合了 PVDF-PB-GO 膜对 Cs 的吸附，表明 Cs 通过 PB 的 Fe(CN)缺陷位和 GO 的含氧基团的化学吸附去除。此外，该膜对痕量放射性铯具有显著的选择性和可重复使用性，即使在存在过量共存离子和实际水中也是如此，这有力地证明了改性膜具有应用潜力。
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