Combining catalysis and separation on a PVDF/Ag composite membrane allows timely separation of products during reaction process
Combining catalysis and separation on a PVDF/Ag composite membrane allows timely separation of products during reaction process
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DOI：
10.1016/j.cej.2016.03.043
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发表时间：
2016-07
影响因子：
15.1
通讯作者：
Xi Chen;Zeya Wang;Shiyin Bi;Kun Li;Runhong Du;Cheng-Lin Wu;Li Chen
中科院分区：
文献类型：
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作者：
Xi Chen;Zeya Wang;Shiyin Bi;Kun Li;Runhong Du;Cheng-Lin Wu;Li Chen
提高催化反应活性，降低从处理体系中分离产物和催化剂的操作成本是催化反应所面临的关键问题。通过浸渍沉淀相转化法制备了一种新型结构的聚偏氟乙烯（PVDF）/银杂化膜，该膜在膜孔中含有银纳米粒子修饰的聚甲基丙烯酸（PMAA）微球和PVDF水溶液。在错流模型下，将所制备的杂化膜用于催化还原4-硝基苯酚。结果表明，该膜能有效地防止纳米银粒子的团聚，提高纳米银粒子的稳定性，具有催化速度快、效率高、使用寿命长等优点。此外，使用该膜避免了从反应体系中分离金属NPs催化剂的额外步骤。更重要的是，在催化反应过程中，产物第一次可以及时地从处理过的溶液中分离出来，这归因于Ag NPs仅在膜孔中。
The faced key issues for a catalytic reaction are improving catalytic reactivity, and decreasing the operating costs of separating products and catalysts from the treated system. These drawbacks are simultaneously overcomed for the first time by constructing a novel structured poly (vinylidene fluoride) (PVDF)/Ag hybrid membrane with microspheres decorated by Ag nanoparticles (NPs) in membrane pores, which is prepared by immersion precipitation phase inversion of theN,N-dimethylformamide solution containing poly (methacrylic acid) (PMAA) microspheres loaded by Ag nanoparticles and PVDF in aqueous solution. The as-formed hybrid membranes are used for the catalytic reduction of 4-nitrophenol under a cross-flow model. Results indicate this membrane prevents the agglomeration of Ag nanoparticles, improves the stability of Ag nanoparticles, having the advantages of a fast catalytic rate, a high efficiency and a long service life. Furthermore, using this membrane avoids the additional steps for separating metal NPs catalysts from reaction system. More importantly, products, for the first time, can be timely separated from the treated solution during the catalytic reaction process, which is ascribed to Ag NPs only in membrane pores.