TY - JOUR
T1 - Underoil superhydrophilic CuC2O4@Cu-MOFs core-shell nanosheets-coated copper mesh membrane for on-demand emulsion separation and simultaneous removal of soluble dye
AU - He, Huaqiang
AU - Liu, Yajie
AU - Zhu, Yingming
AU - Zhang, Tian C.
AU - Yuan, Shaojun
N1 - Funding Information:
The authors acknowledged the financial support from the International (Regional) Joint Research Program of Department of Science and Technology of Sichuan Province (2021YFH0045) and the National Natural Science Foundation of China (21978182) and the Miaozi Project in Science and Technology Innovation Program of Sichuan Province of China (21-YCG021). They also appreciate the Institute of New Energy and Low Carbon Technology of Sichuan University for the measurement of XRD pattern, SEM imaging and EDS spectra, Dr. Xiang Lin and Dr. Jie Wei from the Engineering Teaching Center, School of Chemical Engineering, Sichuan University for the FTIR and DLS measurements, and Miss Panpan Li from Shiyanjia Lab ( www.shiyanjia.com) for the XPS analyses.
Funding Information:
The authors acknowledged the financial support from the International (Regional) Joint Research Program of Department of Science and Technology of Sichuan Province (2021YFH0045) and the National Natural Science Foundation of China (21978182) and the Miaozi Project in Science and Technology Innovation Program of Sichuan Province of China (21-YCG021). They also appreciate the Institute of New Energy and Low Carbon Technology of Sichuan University for the measurement of XRD pattern, SEM imaging and EDS spectra, Dr. Xiang Lin and Dr. Jie Wei from the Engineering Teaching Center, School of Chemical Engineering, Sichuan University for the FTIR and DLS measurements, and Miss Panpan Li from Shiyanjia Lab ( www.shiyanjia.com ) for the XPS analyses.
Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/7/15
Y1 - 2022/7/15
N2 - Underoil superhydrophilic surface is of great significance for the separation of water-in-oil emulsions, but its preparation is still a great challenge due to limited wetting thermodynamics. Herein, a well-designed hierarchical CuC2O4@Cu-MOFs (HKUST-1) core-shell nanosheets-coated copper mesh membrane was fabricated by facile immersion processes for on demand separation of oil-in-water and water-in-oil emulsions as well as highly efficient removal of soluble dyes. The as-fabricated hierarchical CuC2O4@HKUST-1 core-shell nanostructure endowed the mesh membrane with underwater superoleophobicity, underoil superhydrophilicity and excellent underwater oil anti-adhesion capability. Such superwetting MOFs-coated membrane delivered an outstanding separation performance for oil-in-water emulsion with high water flux of up to 1800 L m−2 h−1and the chemical oxygen demand (COD) value of lower than 110 mg L−1 by selective water filtration, whilst it efficiently separated water-in-oil emulsion by adsorption with a water content of lower than 120 ppm. Furthermore, the as-prepared mesh membrane also exhibited high removal efficiency of soluble dyes at circa 94% within 165 min by the adsorption-photocatalytic coupled process. The postulated photocatalytic mechanism of CuC2O4@HKUST-1 composite was ascribed to the photogenerated superoxide ([rad]O2−) and hydroxyl radicals ([rad]OH). With the desirable separation performance to complex oil-in-water emulsion containing both emulsified oil droplets and soluble dyes, the as-synthesized mesh membrane enriches the preparation path of underoil superhydrophilic surface, and expands the application of MOFs-based membrane for complex oily wastewater treatment.
AB - Underoil superhydrophilic surface is of great significance for the separation of water-in-oil emulsions, but its preparation is still a great challenge due to limited wetting thermodynamics. Herein, a well-designed hierarchical CuC2O4@Cu-MOFs (HKUST-1) core-shell nanosheets-coated copper mesh membrane was fabricated by facile immersion processes for on demand separation of oil-in-water and water-in-oil emulsions as well as highly efficient removal of soluble dyes. The as-fabricated hierarchical CuC2O4@HKUST-1 core-shell nanostructure endowed the mesh membrane with underwater superoleophobicity, underoil superhydrophilicity and excellent underwater oil anti-adhesion capability. Such superwetting MOFs-coated membrane delivered an outstanding separation performance for oil-in-water emulsion with high water flux of up to 1800 L m−2 h−1and the chemical oxygen demand (COD) value of lower than 110 mg L−1 by selective water filtration, whilst it efficiently separated water-in-oil emulsion by adsorption with a water content of lower than 120 ppm. Furthermore, the as-prepared mesh membrane also exhibited high removal efficiency of soluble dyes at circa 94% within 165 min by the adsorption-photocatalytic coupled process. The postulated photocatalytic mechanism of CuC2O4@HKUST-1 composite was ascribed to the photogenerated superoxide ([rad]O2−) and hydroxyl radicals ([rad]OH). With the desirable separation performance to complex oil-in-water emulsion containing both emulsified oil droplets and soluble dyes, the as-synthesized mesh membrane enriches the preparation path of underoil superhydrophilic surface, and expands the application of MOFs-based membrane for complex oily wastewater treatment.
KW - Adsorption
KW - Cu-MOFs
KW - CuCO nanosheets
KW - On-demand emulsions separation
KW - Photocatalysis
KW - Underoil superhydrophilic
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U2 - 10.1016/j.seppur.2022.121089
DO - 10.1016/j.seppur.2022.121089
M3 - Article
AN - SCOPUS:85129535511
SN - 1383-5866
VL - 293
JO - Separation and Purification Technology
JF - Separation and Purification Technology
M1 - 121089
ER -