Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 624, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2021.126754
Keywords
Carboxyl poly (aryl ether nitrile); Super-wetting property; Composite membrane; Durability; Multi-component oily wastewater separation
Categories
Funding
- National Natural Science Foundation of China [51903215]
- Sichuan Province SciTech Supported Project [2020YJ0168]
- International Science and Technology Cooperation Project from Chengdu Municipal Government [2020GH02-00074HZ]
- Sichuan Youth Science and Technology Innovation Research Team Project [2020JDTD0018]
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A durable super-wetting composite membrane was prepared for the synergistic treatment of oil-in-water emulsions and dye, showing stable super-wetting performance and separation efficiency under high-temperature and corrosive environments. This work provides an alternative platform for treating complicated oily wastewater in harsh environments.
The polymer membranes with super-wetting surface have shown promising application for oily wastewater treatment. However, the synergistic separation of multi-component oily wastewater in harsh environments is still a big challenge. In this work, we demonstrated a facile strategy to construct the durable super-hydrophilic/ underwater super-oleophobic PEN composite membrane for the synergistic treatment of oil-in-water emulsions and dye. First of all, based on the thermally stable carboxyl poly (aryl ether nitrile), the hydrophilic polymer membrane with rough trench surface was prepared by non-solvent phase conversion, using non-woven fabric (NWF) as template. Secondly, the TiO2 nanoparticles were firmly immobilized onto the membrane surface via biomimetic co-deposition of dopamine (DA), aminopropyltriethoxysilane (APTES), and TiO2 nanoparticles. Especially, the physical confinement effect of rough trench surface, strong adhesion of polydopamine, and chemical crosslinking between APTES and DA contributed to the stable super-wetting performance of composite membrane (CA: 0 degrees and UOC: 151 degrees). Meanwhile, the obtained super-wetting composite membrane exhibited promising synergistic separation performance of multi-component oily wastewater (oil-in-water emulsions and dye). For the separation of oil-in-water emulsions containing 50 ppm methylene blue, the flux and rejection ratio reached 552.25 +/- 25 L/(m(2) h) and 99.38 +/- 1.3%, respectively. More importantly, the prepared composite membrane could keep stable super-wetting property and separation efficiency under high-temperature and corrosive environments (80 degrees C/4 M HCl and 80 degrees C/1 M NaOH). In addition, the low oil adhesion and high tensile strength endowed the composite membrane with high antifouling resistance and excellent recyclability for the separation of multi-component oily wastewater. This work provides an alternative platform for constructing durable super-wetting composite membrane, which shows the potential application for treating complicated oily wastewater of petro-chemistry industry in harsh environments.
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