Nan Sun , Huan Wang , Huazhang Zhao , Fangqin Cheng , Jianfeng Li
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引用次数: 0
摘要
低通量和膜堵塞是膜蒸馏(MD)处理浓缩废水的主要挑战。本研究通过共价键合乙二胺(EDA)和 1,12-二氨基十二烷(DADD)的末端胺基与 GO 片上的羧基,比较了不同层间距离的 GO 复合膜的性能。结果表明,碳链交联较长的 GO-DADD/PTFE 膜具有最高的通量和防污性能。在 70 °C 时,纯水通量达到 68.5 kg/m2-h,处理 NaCl、含 NaCl 的 HA 和含 NaCl 的 BSA 的通量分别比未交联的 GO/PTFE 高 29.8%、37.1% 和 38.5%,比 PTFE 膜高 95.7%、121.2% 和 146.9%。通过质量和热量传递的数学模型,研究发现这种提高的关键在于交联导致的 GO 层内 d 间距的增加,这削弱了开尔文效应,提高了热侧的蒸汽分压。长链交联产生的独特表面结构和静电相互作用进一步增强了防污效果。这些改性不仅克服了保留率和通量之间的典型权衡,还为先进的膜蒸馏应用提供了可扩展的高效解决方案。
Enhanced water permeability and antifouling properties of cross-linked graphene oxide composite membranes with tunable d-spacings
Low flux and membrane fouling are major challenges in membrane distillation (MD) for treating concentrated wastewater. This study compared the performance of GO composite membranes with different interlayer distances, by covalently bonding the terminal amine groups of ethylenediamine (EDA) and 1,12-diaminododecane (DADD) with the carboxyl groups present on the GO sheets. The results indicated that the GO-DADD/PTFE membrane, with longer carbon chain cross-linking, achieved the highest flux and antifouling properties. At 70 °C, the pure water flux reached 68.5 kg/m2·h, and the fluxes for treating NaCl, HA containing NaCl, and BSA containing NaCl were 29.8 %, 37.1 %, and 38.5 % higher than the uncrosslinked GO/PTFE, and 95.7 %, 121.2 %, and 146.9 % higher than the PTFE membrane, respectively. Through mathematical models for mass and heat transfer, the study identified the key to this enhancement as the increased d-spacing within the GO layer due to cross-linking, which weakened the Kelvin effect and enhanced the vapor partial pressure on the hot side. The unique surface structure and electrostatic interactions induced by long-chain cross-linking further boosted the antifouling effect. These modifications not only overcome the typical trade-off between retention rates and flux but also offer a scalable and efficient solution for advanced membrane distillation applications.
期刊介绍:
The Journal of Membrane Science is a publication that focuses on membrane systems and is aimed at academic and industrial chemists, chemical engineers, materials scientists, and membranologists. It publishes original research and reviews on various aspects of membrane transport, membrane formation/structure, fouling, module/process design, and processes/applications. The journal primarily focuses on the structure, function, and performance of non-biological membranes but also includes papers that relate to biological membranes. The Journal of Membrane Science publishes Full Text Papers, State-of-the-Art Reviews, Letters to the Editor, and Perspectives.