School of Naval Architecture and Maritime, Zhejiang Ocean University, Zhoushan 316022, China.
School of Naval Architecture and Maritime, Zhejiang Ocean University, Zhoushan 316022, China.
Sci Total Environ. 2023 Jan 15;856(Pt 2):159271. doi: 10.1016/j.scitotenv.2022.159271. Epub 2022 Oct 7.
To date, most existing engineering materials have difficulty simultaneously separating oil/water and removing heavy metals from complex oily wastewater. In response to this challenge, a novel multifunctional composite hydrogel membrane (named PVA-CS-LDHs) was fabricated by incorporating chitosan (CS) and nanohydrotalcite (LDHs) into a polyvinyl alcohol (PVA) hydrogel. This material was developed using an easy yet versatile strategy of freezing and salting-out, which can enable the formation of a PVA-CS-LDH hydrogel membrane in one step and endow the PVA-CS-LDHs with high strength, excellent stretchability, favourable shape recoverability, and an ideal 3D microstructure. The PVA-CS-LDH membrane can purify emulsified oil and metal ions simultaneously with a separation efficiency of 99.89 % for emulsified oil and a removal efficiency of 97.44 % for Pb2+ ions. Additionally, the high-efficiency, multifunctional, high-antifouling and eco-friendly properties of the PVA-CS-LDH membrane make it a promising hydrogel material for both emulsified oil separation and heavy metal ion removal. Thus, this material provides critical application potential that can address scientific and technological challenges in complex oily wastewater purification.
迄今为止，大多数现有工程材料在同时从复杂含油废水中分离油/水和去除重金属方面都存在困难。针对这一挑战，通过将壳聚糖（CS）和纳米水滑石（LDHs）掺入聚乙烯醇（PVA）水凝胶中，制备了一种新型多功能复合水凝胶膜（命名为 PVA-CS-LDHs）。该材料是使用一种简单而通用的冷冻和盐析策略开发的，该策略可以一步形成 PVA-CS-LDH 水凝胶膜，并赋予 PVA-CS-LDHs 高强度、优异的拉伸性、良好的形状回复性和理想的 3D 微观结构。PVA-CS-LDH 膜可以同时净化乳化油和金属离子，对乳化油的分离效率为 99.89%，对 Pb2+离子的去除效率为 97.44%。此外，PVA-CS-LDH 膜具有高效、多功能、高抗污染和环保等特性，是一种很有前途的用于乳化油分离和重金属离子去除的水凝胶材料。因此，该材料提供了重要的应用潜力，可以解决复杂含油废水净化中的科学和技术挑战。
