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A stable ZIF-8-coated mesh membrane with micro-/nano architectures produced by a facile fabrication method for high-efficiency oil-water separation

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  • ReceivedJun 27, 2018
  • AcceptedAug 27, 2018
  • PublishedSep 19, 2018

Abstract

With the possibility of large-area processing, the ZIF-8-coated mesh membranes with rough micro-/nanostructures and underwater superoleophobic properties were successfully fabricated at ambient temperature and pressure. These membranes exhibited excellent separation efficiency over 99.99% for various oil-water mixtures with the residual oil content in the collected water less than 4 ppm, and high water flux of 10.2×104 L m−2 h−1. Furthermore, the ZIF-8-coated mesh membrane displayed outstanding stability towards high temperature and various organic solvents immersion. More importantly, based on its facile fabrication method, this kind of ZIF-8-coated mesh membrane can be easily enlarged, which is critical for the practical oil-water separation applications.


Funded by

“111” project(B07016)

Open Projects of State Key Laboratory of Safety and Control for Chemicals(SKL-038)

the Ministry of Science and Technology of SINOPEC(A381)

and Xue M are inventors on a Chinese patent(CN201810148543.6)

the National Natural Science Foundation of China(21571076)

Zhao Y


Acknowledgment

This work was financially supported by the National Natural Science Foundation of China (21571076, 21390394, 21571079 and 61701543), “111” project (B07016), the Ministry of Science and Technology of SINOPEC (A381) and Open Projects of State Key Laboratory of Safety and Control for Chemicals (SKL-038). Song M, Zhao Y, and Xue M are inventors of a Chinese patent (CN201810148543.6).


Interest statement

The authors declare no conflict of interest.


Contributions statement

Xue M, Zhao Y, and Qiu S conceived and designed this work. Song M and Xue M conducted the synthesis and analyzed the data. Song M, Zhao Y, Mu S, Jiang C, Li Z, Yang P and Fang Q performed the characterization. Song M, Zhao Y, and Xue M wrote the paper. All authors contributed to the general discussion. Song M and Zhao Y contributed equally to this work.


Author information

Mingqiu Song is currently doing her research at the State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, under the supervision of Prof. Shilun Qiu and Prof. Ming Xue. Her research interests mainly focus on the synthesis and design of MOF membranes and their applications.

Yuxin Zhao obtained his BSc degree in chemistry of materials at China University of Petroleum (East) in 2009. He obtained his PhD degree in chemical engineering and technology at China University of Petroleum (East) (2009–2014) in Prof. Zifeng Yan’s group, with Best Undergraduate Thesis Award. In July 2015, Zhao joined SINOPEC Research Institute of Safety Engineering to start his independent academic career. His research interests are in the synthesis of new classes of materials and nanostructures, with an emphasis on their functionality.

Ming Xue received BSc (2003) and PhD (2008) degree from Jilin University (China) in Prof. Shilun Qiu’s group. He joined the University of Texas at San Antonio (USA) during 2007--2008 and 2014--2015 in Prof. Banglin Chen’s group. Currently, he works in State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University. His group focuses on the design and synthesis of multifunctional MOF materials and membranes for the applications in adsorption, separation and other advanced applications.

Supplement

Supplementary information

Supplementary data are available in the online version of the paper.


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  • Scheme 1

    Schematic diagram of the preparation route of ZIF-8-coated mesh membrane with underwater superoleophobicity.

  • Figure 1

    SEM images of ZIF-8-coated mesh membrane prepared on stainless steel mesh (500 mesh) by seeding and secondary growth process. (a) The bare stainless steel mesh and (b) the seeded stainless steel mesh with uniform ZIF-8 seeds. (c) The ZIF-8-coated mesh membrane and (d) a single ZIF-8-coated wire after secondary growth. (e) The magnified image of ZIF-8-coated membrane surface, in which the homogeneous intergrown polyhedral nanocrystals can be clearly observed. (f) The cross-sectional view of ZIF-8-coated mesh membrane.

  • Figure 2

    3D and 2D AFM images of the bare thread of stainless steel mesh (a1, a2) and after coated with ZIF-8 (b1, b2).

  • Figure 3

    Special wettability of ZIF-8-coated mesh membrane underwater. (a) The photograph of several oil droplets on the ZIF-8-coated mesh membrane; (b) a contact angle image of an oil droplet on the ZIF-8-coated mesh membrane underwater; (c, d) schematic illustrations of an oil droplet on a rough micro and nano architecture surface of ZIF-8-coated mesh membrane (Dichloroethane dyed with Sudan III).

  • Figure 4

    Photographs of the oil-water separation process using (a, b) the ZIF-8-coated mesh membrane, (c, d) the large-area ZIF-8-coated mesh membrane and (e, f) the ZIF-8-coated “boat” (Cyclohexane was dyed with Sudan III).

  • Figure 5

    Oil-water separation performances of the ZIF-8-coated mesh membrane. (a) The separation efficiency and residual oil contents in the collected water for various oils. (b) The influence of different mesh number on water flux and intrusion pressure of oil (calculated by cyclohexane).

  • Figure 6

    Stability and recyclability of ZIF-8-coated mesh membrane (500 mesh). (a, b) Underwater oil contact angles (UWOCAs) of the ZIF-8-coated mesh membrane after heating treatment under different temperatures and immersing in various organic solvents for 20 h. The inset: photos of underwater oil droplets (dichloroethane) standing on ZIF-8-coated mesh membranes after heating and immersing treatment. (c, d) Water flux and separation efficiency for oil-water mixtures of ZIF-8-coated mesh membrane during the 10 cycles.

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