2D Heterostructure Membranes with Sunlight‐Driven Self‐Cleaning Ability for Highly Efficient Oil–Water Separation |
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Authors: | Yanan Liu Yanlei Su Jingyuan Guan Jialin Cao Runnan Zhang Mingrui He Kang Gao Linjie Zhou Zhongyi Jiang |
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Affiliation: | 1. Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin, China;2. Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, China |
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Abstract: | Introducing solar energy into membrane filtration to decrease energy and chemicals consumption represents a promising direction in membrane fields. In this study, a kind of 0D/2D heterojunction is fabricated by depositing biomineralized titanium dioxide (TiO2) nanoparticles with delaminated graphitic carbon nitride (g‐C3N4) nanosheets, and subsequently a kind of 2D heterostructure membrane is fabricated via intercalating g‐C3N4@TiO2 heterojunctions into adjacent graphene oxide (GO) nanosheets by a vacuum‐assisted self‐assembly process. Due to the enlarged interlayer spacing of GO nanosheets, the initial permeation flux of GO/g‐C3N4@TiO2 membrane reaches to 4536 Lm?2 h?1 bar?1, which is more than 40‐fold of GO membranes (101 Lm?2 h?1 bar?1) when utilized for oil/water separation. To solve the sharp permeation flux decline, arising from the adsorption of oil droplets, the a sunlight‐driven self‐cleaning process is followed, maintaining a flux recovery ratio of more than 95% after ten cycles of filtration experiment. The high permeation flux and excellent sunlight‐driven flux recovery of these heterostructure membranes manifest their attractive potential application in water purification. |
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Keywords: | 0D/2D heterojunctions 2D heterostructure membranes graphene oxide nanosheets oil/water separation sunlight‐driven self‐cleaning |
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