PDF(Pubmed)
Abstract：
Drinking water defluoridation has attracted significant attention in the scientific community, from which membrane technology, by exploring thin film nanocomposite (TFN) membranes, has demonstrated a great potential for treating fluoride-contaminated water. This study investigates the development of a TFN membrane by integrating titanium oxide nanosheets (TiO2 NSs) into the polyamide (PA) layer using interfacial polymerization. The characterization results suggest that successfully incorporating TiO2 NSs into the PA layer of the TFN membrane led to a surface with a high negative charge, hydrophilic properties, and a smooth surface at the nanoscale. The TFN membrane, containing 80 ppm of TiO2 NSs, demonstrated a notably high fluoride rejection rate of 98%. The Donnan-steric-pore-model-dielectric-exclusion model was employed to analyze the effect of embedding TiO2 NSs into the PA layer of TFN on membrane properties, including charge density (Xd), the pore radius (rp), and pore dielectric constant (εp). The results indicated that embedding TiO2 NSs increased Xd and decreased the εp by less than the TFC membrane without significantly affecting the rp. The resulting TFN membrane demonstrates promising potential for application in water treatment systems, providing an effective and sustainable solution for fluoride remediation in drinking water.
摘要：
饮用水除氟已引起科学界的广泛关注,膜技术，通过探索薄膜纳米复合材料（TFN）膜，已经证明了处理氟化物污染水的巨大潜力。这项研究通过使用界面聚合将氧化钛纳米片（TiO2NSs）集成到聚酰胺（PA）层中，研究了TFN膜的开发。表征结果表明，成功地将TiO2NSs掺入到TFN膜的PA层中导致具有高负电荷的表面，亲水性能,和纳米级的光滑表面。TFN膜，含有80ppm的TiO2NS，表现出98%的显著高的氟化物排斥率。采用Donnan-空间-孔-模型-介电-排斥模型分析了将TiO2NS嵌入到TFN的PA层中对膜性能的影响。包括电荷密度(Xd)，孔隙半径(rp)，和孔介电常数(εp)。结果表明，嵌入TiO2NSs比TFC膜增加了Xd，降低了εp，而没有显着影响rp。所得到的TFN膜在水处理系统中的应用具有良好的潜力。为饮用水中的氟化物修复提供有效和可持续的解决方案。
