基于双层微纳米纤维膜的气液固三相体系构建及其光催化性能  

Construction of air-liquid-solid tri-phase system from bilayer micro/nanofiber membrane and its photocatalytic performance

作　　者：费建武 吕明泽 刘利伟 王春红[1] 韩振邦[1] FEI Jianwu;LÜMingze;LIU Liwei;WANG Chunhong;HAN Zhenbang(School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China;Tianjin Yuanda Industry and Trade Co., Ltd., Tianjin 301600, China)

机构地区：[1]天津工业大学纺织科学与工程学院,天津300387 [2]天津市远大工贸有限公司,天津301600

出　　处：《纺织学报》2022年第6期37-43,共7页Journal of Textile Research

基　　金：国家自然科学基金青年基金项目(52003192);天津市技术创新引导专项基金项目(20YDTPJC00920);天津市应用基础与前沿技术研究计划青年项目(15JCQNJC06300)。

摘　　要：为提升石墨相氮化碳(g-C_(3)N_(4))的光催化降解性能,通过静电纺丝技术制备了亲疏不对称的双层纳微纤维膜,其中疏水层为聚苯乙烯纤维膜,亲水层为以聚丙烯腈/聚乙烯吡咯为载体的g-C_(3)N_(4)/酞菁铁(FePc)异质结催化膜,对其表面形貌、化学结构和光吸收性能进行表征,并考察了对染料废水的光催化降解作用。结果表明:水接触角分别为140°和12°的疏水层和亲水催化层可紧密结合,其中催化层中g-C_(3)N_(4)和FePc在纤维膜上分布均匀,且FePc的引入将纤维膜的光吸收范围拓展至800 nm;在染料的光催化降解中,疏水层可作为气体通道将空气中的O2传输至亲水催化层,从而形成气液固三相接触的反应体系,有效促进O2对g-C_(3)N_(4)导带光生电子的俘获,使其光催化活性较常规二相体系提升3.1倍。To enhance the photocatalytic degradation performance of the graphitic carbon nitride(g-C_(3)N_(4)),a bilayer micro/nanofiber membrane with opposing wettability has been developed via the electrospinning method,where the polystyrene membrane was used as the hydrophobic layer,and the g-C_(3)N_(4)/iron(II)phthalocyanine(FePc)heterojunction was taken for the hydrophilic layer on a polyacrylonitrile/polyvinylpyrrolidone membrane substrate.The morphology,chemical construction and optical absorption of the prepared bilayer membrane were investigated,and the photocatalytic performance for dye degradation was studied.The results indicate that the hydrophobic layer and the hydrophilic catalyst layer,with the water contact angle of 140°and 12°,respectively,can be tightly combined with each other.The distribution of g-C_(3)N_(4)/FePc on the catalyst layer is uniform,and the sensitization of FePc extends the optical absorption up to 800 nm.During the photocatalytic dye degradation,the hydrophobic layer can serve as gas passage to quickly deliver O2 from air to the catalytic interface.This greatly boosts the capture of photoelectrons in conduction band of g-C_(3)N_(4) by O2 via constructing an air-liquid-solid triphase contact interface,resulting in 3.1 times fold higher reaction kinetics versus a normal diphase system.

关 键 词：纳微纤维膜 氮化碳 三相体系 光催化性能 染料降解 

分 类 号：TQ619.2[化学工程—精细化工] X522[环境科学与工程—环境工程]