Superhydrophilic-underwater superoleophobic particles for oily wastewater treatment and methods for their preparation and application
An underwater super-oleophobic and sewage treatment technology, applied in the fields of energy wastewater treatment, chemical instruments and methods, separation methods, etc., can solve the problems of low separation efficiency, easy clogging of pores, unsuitable for light oil, etc., and achieve high separation efficiency , raw materials are easy to obtain, and the preparation process is simple
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[0058] The preparation method of superhydrophilic-underwater superoleophobic particles for oily sewage treatment comprises the following steps:
[0059] (1) After cleaning the particle core material, dry it completely at 100-200°C (such as 100°C, 150°C, 200°C, etc.), and let it stand for cooling;
[0060] (2) After the particle core material is cooled to room temperature, add it into the stirring pot, and while stirring, add the hydrophilic resin and the corresponding curing agent to mix uniformly;
[0061] (3) Before the resin is not cured, add micron-scale hydrophilic material, mix evenly, then add nano-scale hydrophilic material, mix evenly, and dry at 40-50°C (such as 40°C, 45°C, 50°C, etc.), After the resin is hardened to form a film, superhydrophilic-underwater superoleophobic particles with surface micro-nano secondary rough structure are obtained, which are superhydrophilic-underwater superoleophobic particles for oily sewage treatment.
[0062] The application method...
Embodiment 1
[0067] 90 parts of quartz sand with a particle size of 100-300 μm were washed with tap water for 3 minutes, then placed in an oven at 150° C. to be dried for 24 hours, taken out and left to cool. Add the quartz sand into the stirring pot, add 4 parts of water-based epoxy resin and 1 part of polyamide curing agent while stirring, and then add 4 parts of silica fume with a particle size of 10-50 μm and 1 part of a particle size of 5 -60nm nano-SiO 2 , continue to stir evenly. Then, it was put into a vacuum drying oven at 50 °C for 24 h to obtain superhydrophilic-underwater superoleophobic particles.
Embodiment 2
[0069] 92 parts of desert sand with a particle size of 200-400 μm were dried at 180°C for 2 hours, washed with tap water for 3 minutes, allowed to stand, and then placed in an oven at 120°C for 24 hours. After drying, they were taken out and left to cool. Add the cooled desert sand into the stirring pot, add 3 parts of water-based polyurethane resin and 1 part of water-based isocyanate curing agent while stirring, stir evenly, and then add 2.5 parts of micron calcium carbonate powder with a particle size of 10-50 μm and 1.5 parts in turn Nano-TiO with a particle size of 5-50nm 2 , continue to mix until homogeneous. Then, it was put into a vacuum drying oven at 50 °C for 24 h to obtain superhydrophilic-underwater superoleophobic particles.
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