Preparation and optimization of PVDF composite membrane for efficient and selective removal of radioactive cesium
YE Zhao-yong1, DING Shi-yuan2,3, YANG Yu1, HOU Li-an1
1. State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Beijing Normal University, Beijing 100875, China; 2. School of Earth System Science, Tianjin University, Tianjin 300072, China; 3. Tianjin Key Laboratory of Earth Critical Zone Science and Sustainable Development in Bohai Rim, Tianjin 300072, China
Abstract:In order to achieve the efficient removal of radionuclide cesium (Cs), the FeCN/SiO2/PVDF composite membrane was prepared through the surface grafting between amino functional groups of SiO2 and Fe3+, after SiO2 coating on the hydroxylated PVDF membrane. Loading dosage and particle size of SiO2 were optimized by SEM and XPS analysis to be 0.4% and 300nm, respectively. The Cs removal rate was improved to be more than 99.6% after three times loading of the composite membrane. In addition, XPS results illustrated that the prepared membrane was stable even under strong acid and ultrasound conditions. In the complicated water solution, the coexisting cations competed with Cs adsorption when their hydrated ionic radius were similar in the early stage of filtration. In the later stage, the extent of Cs removal rate decline was positively correlated with the ion radius of coexisting cations due to the influence of Donnan effect. Additionally, natural organic matter (NOM) had a larger effect on water flux, whereas had a weaker effect on Cs removal than that of coexisting cations.
叶兆勇, 丁士元, 杨禹, 侯立安. 高效选择性除铯的PVDF复合膜制备及优化[J]. 中国环境科学, 2021, 41(5): 2187-2195.
YE Zhao-yong, DING Shi-yuan, YANG Yu, HOU Li-an. Preparation and optimization of PVDF composite membrane for efficient and selective removal of radioactive cesium. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(5): 2187-2195.
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