刘俊 范思萌 惠倩 邱磊 袁彬 常梦洁 李亚清 屈孟男 张莉

摘 要：為开发新型高效易分离的可见光催化材料，利用静电纺丝和高温煅烧相结合的方法制备了磁性Fe2O3纳米纤维，然后通过连续离子吸附反应法在Fe2O3纳米纤维表面组装了MIL-100（Fe）纳米颗粒壳层，合成了一种可磁分离的金属有机骨架复合纳米纤维（Fe2O3/MIL-100（Fe））。分别采用扫描电镜和X射线衍射对其微观形貌和物相结构进行表征，并以对RhB的光降解分析了其光催化性能。在475 ℃煅烧2 h形成的Fe2O3纳米纤维表面进行30次连续离子吸附反应制备的Fe2O3/MIL-100（Fe）-30纤维直径均一，平均直径为180 nm，Fe2O3和MIL-100（Fe）均具有较高的结晶度。Fe2O3/MIL-100（Fe）-30复合纤维对RhB具有最优的可见光催化活性，在H2O2存在下，可见光照60 min后，降解率达99.4%.重复使用5次后，光催化降解率仍在98%以上，且MIL-100（Fe）在Fe2O3纤维表面保持了很高的稳定性。结果表明，通过简单的连续离子吸附反应，在磁性纤维表面可大量负载MIL-100（Fe）光催化剂，磁性纤维负载的MIL-100（Fe）光催化剂同时具有可磁分离、抑制催化剂团聚、高负载量和催化活性的优点。关键词：金属-有机骨架;Fe2O3纳米纤维;MIL-100（Fe）;可见光催化;磁分离中图分类号：TQ 424.2

文献标志码：A

文章编号：1672-9315（2020）06-01064-07

DOI：10.13800/j.cnki.xakjdxxb.2020.0617开放科学（资源服务）标识码（OSID）：

Fabrication and photocatalytic performance of magnetic nanofibers

supported Fe2O3/MIL-100（Fe）

LIU Jun1，FAN Si-meng1，HUI Qian1，QIU Lei1，YUAN Bin1，

CHANG Meng-jie1，LI Ya-qing2，QU Meng-nan3，ZHANG Li1

（1.

College of Materials Science and Engineering，Xian University of Science and Technology，Xian 710054，China;

2.College of Safety Science and Engineering，Xian University of Science and Technology，Xian 710054，China;

3.College of Chemistry and Chemical  Engineering，Xian University of Science and Technology，Xian 710054，China）

Abstract：In order to explore novel visible light photocatalytic materials featured by higher photocatalytic performance and easier separation，magnetic Fe2O3 nanofibers were produced by combining electrospinning and calcination methods.Then magnetic separately metal organic framework composite nanofibers of Fe2O3/MIL-100（Fe）were fabricated through deposition of MIL-100（Fe）nanoparticle shells on the Fe2O3 nanofiber surface by successive ion layer absorption and reaction（SILAR）method.Scanning electron microscopy（SEM）and X-ray diffraction were applied to detect the microstructure and phase structure of the samples respectively.The photocatalytic performance of the samples were evaluated by degrading the RhB dye solution.The Fe2O3/MIL-100（Fe）-30 nanofibers，prepared by 30 cycle SILAR process on Fe2O3 nanofiber surface that formed by calcination at 475 ℃ for 2 h，have uniform size with average diameter of 180 nm.Both Fe2O3 and MIL-100（Fe）display high crystallinity.The Fe2O3/MIL-100（Fe）-30 composite fibers exhibit the highest visible light photocatalytic performance towards degrading RhB in the presence of H2O2.The degradation efficiency achieves 99.4% under visible light irradiation for 60 min.The degradation percentage remains above 98% after five photocatalysis cycles，and the MIL-100（Fe）shows good stability on the Fe2O3 fiber surface.The results show that large amounts of MIL-100（Fe）photocatalys can be attached on the magnetic fiber surface through the simple SILAR procedure.Magnetic fibers loaded photocatalysts possess the advantages of magnetic separation，decrease of aggregation，higher quantity loading and photocatalysis activities.

Key words：metal-organic framework;Fe2O3 nanofibers;MIL-100（Fe）;visible light photocatalysis;magnetic separation

0 引 言

人工合成染料在工业发展和社会进步中扮演着重要的角色，广泛应用于纺织、印染、食品等多个行业。但随之对人类健康和生存环境带来的威协也越来越受到人们的重视[1]。光催化氧化降解有机污染物技术可以利用太阳能，在光催化剂表面将有机染料氧化转变为CO2和H2O，被认为是解环境问题的有效途径[2]。……