掺铈氧化纳米复合膜用于反渗透海水淡化。

Cerium oxide doped nanocomposite membranes for reverse osmosis desalination.

机构信息

Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao, 266237, Shandong, PR China.

Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao, 266237, Shandong, PR China.

出版信息

Chemosphere. 2019 Mar;218:974-983. doi: 10.1016/j.chemosphere.2018.11.207. Epub 2018 Nov 30.

Abstract

Cerium oxide (CeO) nanoparticles (NPs) have indicated great potentials as nanofiller owing to its high surface area, antioxidant properties and low cost. In this paper, thin film nanocomposite (TFN) RO membranes were proposed to be prepared through incorporation of hydrophilic CeO NPs in polyamide (PA) selective layers via interfacial polymerization (IP). EDX, XPS, SEM, AFM, contact angle and zeta potential were used to examine the property and morphology of the prepared membranes. CeO NPs were successfully embedded in the PA network, which endowed the TFN membranes with rougher surfaces and thinner PA layers. The TFN membranes were fabricated with different CeO NPs contents (0, 50, 100, 150, 200, 400 mg/L). With increasing CeO NPs loading amount, the hydrophilicity improved from 85.4° to 65.7° and the surface charge declined from -19.4 to -34.2 mV. These characteristics contributed to a 50% enhancement in water flux of TFN-CeO100 membrane (containing 100 mg/L of CeO NPs) without compromise the NaCl rejection (98%). Moreover, CeO embedded membrane exhibited an enhanced fouling resistance property through preventing the adhesion of hydrophobic foultants. This study demonstrated the desirable applicability of CeO NPs in synthesizing novel TFN membranes for desalination application.

摘要

氧化铈(CeO)纳米粒子(NPs)因其高比表面积、抗氧化性能和低成本而显示出作为纳米填充剂的巨大潜力。在本文中,通过界面聚合(IP)将亲水性 CeO NPs 掺入聚酰胺(PA)选择性层中,提出了制备薄膜纳米复合(TFN)RO 膜。使用 EDX、XPS、SEM、AFM、接触角和zeta 电位来检查制备的膜的性能和形态。CeO NPs 成功地嵌入到 PA 网络中,这使 TFN 膜具有更粗糙的表面和更薄的 PA 层。用不同浓度(0、50、100、150、200、400 mg/L)的 CeO NPs 制备了 TFN 膜。随着 CeO NPs 负载量的增加,亲水性从 85.4°提高到 65.7°,表面电荷从-19.4 mV 降低到-34.2 mV。这些特性使 TFN-CeO100 膜(含有 100 mg/L CeO NPs)的水通量提高了 50%,而不会降低 NaCl 的截留率(98%)。此外,嵌入 CeO 的膜通过防止疏水性污染物的附着,表现出增强的抗污染性能。本研究证明了 CeO NPs 在合成新型 TFN 膜用于海水淡化应用中的良好适用性。

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