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具有三相界面异质结构的多组分复合膜作为光催化剂用于去除有机染料

Multicomponent Composite Membrane with Three-Phase Interface Heterostructure as Photocatalyst for Organic Dye Removal.

作者信息

Liu Li, Wang Doudou, Huang Jun, Huang Zhixuan, Zhang Ye, Li Lili

机构信息

Key Laboratory of Automobile Materials, Ministry of Education, and College of Materials Science and Engineering, Jilin University, Changchun 130022, China.

出版信息

ACS Omega. 2022 May 15;7(20):17128-17143. doi: 10.1021/acsomega.2c00686. eCollection 2022 May 24.

DOI:10.1021/acsomega.2c00686
PMID:35647466
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9134254/
Abstract

A multicomponent composite membrane (P-S-T/C) with three-phase interface heterostructure is ingeniously designed. A polydopamine (PDA)-modified conductive carbon fiber cloth (C) is used as the substrate. Activated poly(vinylidene fluoride) (PVDF) with titanium dioxide (TiO) and a silicon dioxide (SiO) aerogel are electrospun as the top layer. The three-phase interface heterostructure was formed by TiO, conductive C, and the SiO aerogel. Its photocatalytic performance is validated by photodegradation of organic dyes in a low-oxygen (O) water environment. On combining with the capillary condensation of a bilayer structure, P-S-T/C exhibits excellent removal capability for anionic and cationic dyes. Moreover, P-S-T/C exhibits excellent stability and recyclability under simulated sunlight. The mechanism study indicates that the separated photogenerated carriers diffuse to the composite membrane surface rapidly on the three-phase interface of P-S-T/C. The abundant O adsorbed on the porous SiO aerogel surface acts as an electron (e)-trapping agent, which can also decrease the work function of the composite materials. Superoxide radicals (O ) play a dominant role in the reaction of photodegradation supported by a free radical-trapping experiment. This work paves a way to design a membrane with photocatalytic performance by constructing the interface heterostructure.

摘要

一种具有三相界面异质结构的多组分复合膜（P-S-T/C）被巧妙设计。以聚多巴胺（PDA）修饰的导电碳纤维布（C）作为基底。将含有二氧化钛（TiO）和二氧化硅（SiO）气凝胶的活性聚偏氟乙烯（PVDF）进行电纺作为顶层。三相界面异质结构由TiO、导电C和SiO气凝胶形成。其光催化性能通过在低氧（O）水环境中对有机染料的光降解得以验证。与双层结构的毛细凝聚相结合时，P-S-T/C对阴离子和阳离子染料表现出优异的去除能力。此外，P-S-T/C在模拟阳光下表现出优异的稳定性和可回收性。机理研究表明，分离的光生载流子在P-S-T/C的三相界面上迅速扩散到复合膜表面。吸附在多孔SiO气凝胶表面的大量O作为电子（e）捕获剂，这也能降低复合材料的功函数。超氧自由基（O ）在自由基捕获实验支持的光降解反应中起主导作用。这项工作为通过构建界面异质结构来设计具有光催化性能的膜铺平了道路。

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