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Pickering Interfacial Catalyst with CO2 and Magnetic Dual-Response for Fast Recovering in Biphasic Reaction
来源:王建黎教授个人网站 发布日期:2019-04-18
作者:Jun Tang, Xue Zhou, Shixiong Cao, Lingyu Zhu, Lingling Xi, and Jianli Wang*
关键字:Biphasic reaction, CO2, magnetic, Pickering interfacial catalysis, recovery
论文来源:期刊
具体来源:ACS Applied Materials & Interfaces
发表时间:2019年

        Pickering界面催化作用通过增大反应界面为双相反应提供了一个良好的平台,但由于纳米催化剂在液-液界面吸附能较高,使得它的分离和回收十分困难。据此提出了一种基于磁性和CO2双响应的纳米复合物Fe3O4@ SiO2 @ P(TMA-DEA)的新型多功能皮克林乳液。 这种纳米粒子有助于在双相体系中形成稳定的油包水(W /O)Pickering乳液,并通过鼓入CO2来实现破乳。在外加磁场的情况下,纳米粒子在2分钟内就可以被轻松捕获这显示出其优异的可回收性。 在用于醇氧化的Anelli系统中,与未乳化的两相相比,Pickering乳液中纳米催化剂的催化效率增大了3倍,并且5次循环套用后几乎没有活性损失。这种新颖的双响应系统为有效回收纳米催化剂和强化液液双相反应提供了一种绿色节能的策略。

Pickering interfacial catalysis provides an excellent platform for biphasic reactions, but the separation and recycling of nanocatalyst is a challenge because of high adsorption energy of nanocatalyst at the liquid-liquid interface. In this work, we represent a new type of versatile Pickering emulsion based on magnetic and CO2-responsive nanohybrids Fe3O4@SiO2@P(TMA-DEA). The smart nanoparticles can stabilize the water-in-oil (W/O) Pickering emulsion in biphasic system, and achieve the subsequent demulsification by bubbling CO2 ascribed to their reversible switching surface. In the absence of energy barrier, the nanohybrids can be easily captured in situ by magnetic field in 2 min and showed excellent recyclability. In the Anelli system for alcohol oxidation, the nanocatalyst exhibited threefold enhancement in catalytic efficiency in comparison with unemulsified two-phase, and little loss on activity after 5 cycles. The  conceptually novel dual-responsive system offer a green and energy-saving strategy for effective recycling of nanocatalyst and intensification of biphasic reaction.


DOI: 10.1021/acsami.9b00821

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