Li Zhiyong, Shi Yunlei, Zhu Anlian, Zhao Yuling, Wang Huiyong, Binks Bernard P, Wang Jianji
Collaborative Innovation Center of Henan Province for, Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan, 453007, P. R. China.
Department of Chemistry, University of Hull, Hull, HU6 7RX, UK.
Angew Chem Int Ed Engl. 2021 Feb 19;60(8):3928-3933. doi: 10.1002/anie.202010750. Epub 2020 Dec 27.
Pickering emulsions are an excellent platform for interfacial catalysis. However, developing simple and efficient strategies to achieve product separation and catalyst and emulsifier recovery is still a challenge. Herein, we report the reversible transition between emulsification and demulsification of a light-responsive Pickering emulsion, triggered by alternating between UV and visible light irradiation. The Pickering emulsion is fabricated from Pd-supported silica nanoparticles, azobenzene ionic liquid surfactant, n-octane, and water. This phase behavior is attributed to the adsorption of azobenzene ionic liquid surfactant on the surface of the nanoparticles and the light-responsive activity of ionic liquid surfactant. The Pickering emulsion can be used as a microreactor that enables catalytic reaction, product separation as well as emulsifier and catalyst recycling. Catalytic hydrogenation of unsaturated hydrocarbons at room temperature and atmospheric pressure has been performed in this system to demonstrate product separation and emulsifier and catalyst re-use.
皮克林乳液是界面催化的优良平台。然而，开发简单有效的策略以实现产物分离以及催化剂和乳化剂回收仍是一项挑战。在此，我们报道了一种光响应型皮克林乳液在紫外光和可见光照射交替触发下的乳化与破乳之间的可逆转变。该皮克林乳液由钯负载的二氧化硅纳米颗粒、偶氮苯离子液体表面活性剂、正辛烷和水制备而成。这种相行为归因于偶氮苯离子液体表面活性剂在纳米颗粒表面的吸附以及离子液体表面活性剂的光响应活性。该皮克林乳液可用作微反应器，实现催化反应、产物分离以及乳化剂和催化剂的循环利用。已在该体系中进行了室温及大气压下不饱和烃的催化氢化反应，以证明产物分离以及乳化剂和催化剂的再利用。
