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Design of ultrathin hybrid membranes with improved retention efficiency of molecular dyes

机译：超薄杂交膜的设计改善了分子染料保留效率

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Ultrathin layers of 2,2,6,6-Tetramethyl-1-piperidinyloxy (TEMPO) Oxidized Cellulose Nanofibers (TOCNF) embedded with Graphene Oxide nanosheets (GOs) in different ratios were built, via the blade coating technique, on a polyvinylidene difluoride (PVDF) substrate to obtain superior membranes for separating water pollutants from aqueous media. Cellulose nanofiber-graphene oxide hybrid materials have shown a great potential for water purification due to their active microporous structure with extended areas rich in negatively charged carboxyl functional groups capable of adsorbing positively charged contaminants efficiently. In contrast to the pristine free-standing TOCNF films, which are completely impermeable, the ultrathin (68 nm thick) hybrid coating with a 100 : 1 TOCNF : GO ratio showed a stable water permeability (816 +/- 3.4 L m(-2) h(-1) bar(-1)) higher than that of common polymeric membranes, and a very efficient size selectivity during filtration of water contaminated by various types of dyes. The membranes had high retention efficiency (82-99%) for dyes with hydrated radii greater than approximate to 0.5 nm due to the favorable combination of electrostatic/hydrophobic interactions with the hybrid matrices and steric entrapment controlled by the pore size. This was confirmed by theoretical calculations that revealed both the structure and dynamic behavior of the dyes in the complex environment of the membranes.
机译：用叶片涂布技术在聚偏二氟化物上构建不同比例的2,2,6,6-四甲基-1-哌啶氧基（TEMPO）氧化纤维素纳米纤维（TOCNF）的氧化纤维素纳米纤维（TOCNF）的氧化纤维素纳米纤维（GOSCNF）（ PVDF）基材获得优质膜，用于将水污染物从水性介质中分离。纤维素纳米纤维 - 石墨烯氧化物杂交材料已经出现了由于其活性微孔结构具有较大的水净化潜力，其具有富含带负电荷的羧基官能团的延长区域，能够有效吸附带正电荷的污染物。与完全不透水的原始自由膜相比，超薄（68nm厚）杂化涂层具有100：1的杂交涂层：GO比率显示出稳定的水渗透性（816 +/- 3.4 L m（-2 ）H（-1）杆（-1））高于普通聚合物膜的棒（-1），以及在过滤由各种类型染料的水过滤期间的非常有效的尺寸选择性。由于静电/疏水相互作用与由孔径控制的空间截留的良好组合，膜具有高于近似至0.5nm的水合半径的染料的高保​​留效率（82-99％）。这是通过理论计算证实的，其揭示了膜复杂环境中染料的结构和动态行为。

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    《RSC Advances》 |2019年第49期|共13页
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  • 正文语种 eng
  • 中图分类 化学;
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