具有核壳结构的基于纤维素的静电纺纳米纤维膜，具有强大的光催化活性，可同时高效分离油乳液、降解染料和还原 Cr(VI)。

Cellulose-based electrospun nanofiber membrane with core-sheath structure and robust photocatalytic activity for simultaneous and efficient oil emulsions separation, dye degradation and Cr(VI) reduction.

机构信息

Shaanxi Provincial Key Laboratory of Papermaking Technology and Specialty Paper Development, National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science and Technology, Xi'an, 710021, China; Limerick Pulp and Paper Centre, University of New Brunswick, Fredericton, New Brunswick, E3B 5A3, Canada.

出版信息

Carbohydr Polym. 2021 Apr 15;258:117676. doi: 10.1016/j.carbpol.2021.117676. Epub 2021 Jan 22.

DOI:10.1016/j.carbpol.2021.117676

PMID:33593552

Abstract

Electrospun nanofiber membrane (ENM) shows great advantage and potential in wastewater treatment due to its unique properties. However, exploring a green and efficient ENM for remediation of complex wastewater, such as simultaneous containing oils, dyes and heavy metal ion, remains challenging. In this work, a cellulose-based photocatalytic ENM, is constructed for this purpose. The hybrid ENM is prepared via electrospinning deacetylated cellulose acetate/polyvinyl pyrrolidone (CeP) nanofibers as skeleton cores and in-situ synthesis of beta hydroxyl oxidize iron decorated iron-based MOF (β-FeOOH@MIL-100(Fe)) heterojunctions as photocatalytic sheaths. The core-sheath structured ENM has ultrahigh MIL-100(Fe) loading (78 wt%), large surface areas (1105 m/g) and well-dispersed β-FeOOH nanorods. Thanks to these porous and hydrophilic MIL-100(Fe), along with a robust photocatalysis-Fenton synergy from β-FeOOH@MIL-100(Fe), the as-prepared ENM shows outstanding performances with simultaneous high removal efficiency for oils (99.5 %), dyes (99.4 %) and chromium ion (Cr(VI)) (99.7 %). Additionally, the photocatalytic ENM can achieve a long-term reuse owing to its inherent self-cleaning function.

摘要

静电纺纳米纤维膜（ENM）由于其独特的性质，在废水处理中显示出巨大的优势和潜力。然而，探索一种绿色高效的 ENM 来修复复杂废水，如同时含有油、染料和重金属离子的废水，仍然具有挑战性。在这项工作中，为此目的构建了一种基于纤维素的光催化 ENM。通过静电纺丝脱乙酰纤维素/聚乙烯吡咯烷酮（CeP）纳米纤维作为骨架核心，并原位合成β-羟基氧化铁修饰的铁基 MOF（β-FeOOH@MIL-100(Fe)）异质结来制备混合 ENM。这种核壳结构的 ENM 具有超高的 MIL-100(Fe)负载量（78wt%）、大的比表面积（1105m/g）和均匀分散的β-FeOOH纳米棒。由于这些多孔和亲水的 MIL-100(Fe)，以及来自β-FeOOH@MIL-100(Fe)的强大光催化-Fenton 协同作用，所制备的 ENM 表现出出色的性能，同时对油（99.5%）、染料（99.4%）和铬离子（Cr(VI)）（99.7%）具有高去除效率。此外，由于其固有的自清洁功能，光催化 ENM 可以实现长期重复使用。