期刊
CHEMICAL ENGINEERING JOURNAL
卷 446, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.137143
关键词
Cesium; Strontium; Nanofiltration membrane; Prussian blue; Graphene oxide; Polyethylene glycol
资金
- National Natural Science Foundation of China [51920105012]
- National Key Research and Development Program of China [2019YFA0705803]
In this study, a novel modified nanofiltration (NF) membrane was fabricated by incorporating Prussian blue (PB), graphene oxide (GO), and polyethylene glycol (PEG) into a polysulfone (PSf) substrate. The modified membrane showed efficient rejection of cesium (Cs+) and strontium (Sr2+) contaminants, even in the presence of inorganic salts and organic matters. It exhibited excellent stability and regeneration capability, making it a promising candidate for simultaneous removal of Cs+ and Sr2+ from contaminated water.
In this study, a novel modified nanofiltration (NF) membrane was fabricated to treat radionuclide-contaminated water by incorporation of Prussian blue (PB), graphene oxide (GO) and polyethylene glycol (PEG) into polysulfone (PSf) substrate. In this work, PB provided a large number of adsorption sites for the membrane, GO improved the Donnan effect of the polyamide (PA) layer by enhancing the negative charge, and PEG promoted the uniform dispersion of PB through interparticle electrostatic interaction and steric hindrance while increasing the adsorption sites on the surface of channels in the substrate by adjusting the pore structure. A conceptual model for the role of substrate in interfacial polymerization was then proposed. The modified membrane achieved efficient rejection of cesium (Cs+, 99.5%) and strontium (Sr2+, 97.5%). Its Cs+ rejection rate still remained high (about 96%) even in the treatment of natural surface water containing various inorganic salts and organic matters. What's more, the modified membrane exhibited excellent stability in both strong acid solutions and long-term operation. Then, potassium chloride (KCl) solution was applied to regenerate the modified membrane, which achieved high generation rate as compared to traditional acid regenerants. The excellent filtration performance inferred that the novel GO/PB-modified NF membrane holds great application potential for the application of simultaneous removal of radioactive Cs+ and Sr2+ from contaminated water.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据