Journal
MATERIALS TODAY CHEMISTRY
Volume 23, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.mtchem.2021.100717
Keywords
Ag2O/TiO2 heterojunction; CuC2O4 nanosheets; Oil-in-water emulsion separation; Photodegradation; Photo-Fenton-like reaction
Funding
- International (Regional) Joint Research Program of Department of Science and Technology of Sichuan Province [2021YFH0045]
- National Natural Science Foundation of China [21978182]
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A novel hierarchical Ag2O/TiO2 heterojunction-loaded CuC2O4 nanosheet-decorated copper mesh was designed to simultaneously remove insoluble oily compounds and soluble organic pollutants, showing superior antipollution ability and oil/water separation efficiency.
A novel oily wastewater treatment strategy of simultaneously removing insoluble oily compounds and soluble organic pollutants is highly desirable. Herein, a hierarchical Ag2O/TiO2 heterojunction-loaded CuC2O4 nanosheet-decorated copper mesh (Ag2O/TiO2@CuC2O4 CM) was rationally designed by a combination of chemical etching and solvothermal deposition methods to implement the strategy. The Ag2O/TiO2@CuC2O4 CM with hierarchical nanostructures derived from hydrophilic CuC2O4 nanosheets and belt-like Ag2O/TiO2 heterojunction was proven to exhibit superior superhydrophilicity, underwater superoleophobicity, and photocatalytic ability, which greatly improved the antipollution ability of the substrate mesh. The as-fabricated mesh with a reasonable mesh number can efficiently separate oil/water mixtures with an ultra-high flux (-70 kL m(-2) h(-1)) and surfactant-stabilized oil-in-water emulsions with an ultra-low residue oil content in filtrate (<60 mg L-1). More importantly, the loaded heterojunction on the CM showed a high photodegradation efficiency of about 94.1% toward soluble methylene blue and self-cleaning ability to regenerate oil-contaminated mesh within 60 min under visible light irradiation by photo-Fenton-like reaction. Besides, the favorable salt resistance, acid and alkali resistance, and stability of the CM for long-term use were also observed. Thus, this study provides a new way for the treatment of complex oily wastewater. (C) 2021 Elsevier Ltd. All rights reserved.
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