Design of polymer composite-based porous membrane for in-situ photocatalytic degradation of adsorbed organic dyes
Design of polymer composite-based porous membrane for in-situ photocatalytic degradation of adsorbed organic dyes
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用于原位光催化降解吸附有机染料的聚合物复合多孔膜的设计
DOI：
10.1016/j.jpcs.2021.110094
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发表时间：
2021-04-06
影响因子：
4
通讯作者：
Liu, Xiaobo
中科院分区：
文献类型：
--
作者：
Liu, Xiaocan;Wang, Lingling;Liu, Xiaobo
在环境修复中，对能够吸附并随后降解有机染料的双功能分离膜的需求很高。在这项研究中，杂化多孔膜已通过相转化的两亲性聚合物（磺化聚芳醚腈，简称SPEN），使用聚乙二醇（PEG）和二氧化钛二氧化钛作为牺牲造孔剂和光催化剂，分别制备。此外，我们还发现PEG-TiO 2的负载量对杂化多孔膜的微观形貌和表面润湿性起着决定性的作用，从而决定了杂化多孔膜对有机染料甲基蓝（MB）的吸附和光催化降解能力。随着PEG-TiO 2负载量的增加，杂化多孔膜的平衡含水量和孔隙率呈现先增加后降低的趋势，对MB的吸附量变化趋势相似。相反，PEG-TiO 2负载量的增加使杂化多孔膜的孔径增大，表面亲水性增强，有利于吸附MB的原位光催化降解，在优化条件下，杂化多孔膜对吸附MB的原位光催化降解率高达99.9%。同时，优化后的杂化多孔膜在再生3次后仍能保持较好的亚甲基蓝吸附和光催化降解性能。基于这些结果，目前的工作基本上开辟了新的途径，制备多功能可重复使用的多孔膜，用于环境修复应用。
Dual functional separation membranes that enable the adsorption and subsequent degradation of organic dyes are highly demanded in the environmental remediation. In this study, the hybrid porous membrane has been fabricate via the phase inversion of an amphiphilic polymer (sulfonated polyarylene ether nitrile, abbreviated as SPEN) by using polyethylene glycol (PEG) and titanium dioxide TiO2 as sacrificial pore-forming agent and photocatalyst, respectively. Furthermore, we found that the loading content of PEG-TiO2 played the decisive role in modulation of the fine morphology and surface wettability of obtained hybrid porous membrane, which in turn determined their adsorption and photocatalytic degradation capacities towards organic dye of methyl blue (MB). More specifically, as the increasing of loading content of PEG-TiO2, the obtained hybrid porous membrane exhibited firstly increased and then decreased equilibrium water content (EWC) and porosity, leading to their similar variation of adsorption capacities towards MB. On the contrary, the increased loading content of PEG-TiO2 renders the obtained hybrid porous membrane with larger pore size and more hydrophilic surface, which contributed to the enhanced in-situ photocatalytic degradation of adsorbed MB, and as high as 99.9% adsorbed MB by hybrid porous membrane can be in-situ photo-catalytically degraded under optimized condition. Meanwhile, the MB adsorption and photocatalytic degradation capacities of the optimized hybrid porous membrane can be well preserved after re-generation for three times. Based on these results, the current work basically opens new ways to fabricate multifunctional re-useable porous membrane for environmental remediation application.