Superhydrophilic-superoleophobic particle for oily sewage treatment as well as preparation method and application thereof

A hydrophilic, oleophobic and super-hydrophilic technology, applied in separation methods, chemical instruments and methods, grease/oily substances/floating matter removal devices, etc. Low problems, to achieve stable super-hydrophilic and super-oleophobic, efficient treatment, high separation efficiency

Pending Publication Date: 2021-12-28
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention proposes a preparation method and application of a granular filter material with both superhydrophilic and superoleophobic properties, which solves the problems of traditional oil-water separation technology, high cost, high energy consumption, complicated operation and low separation efficiency, and overcomes the problems of super The disadvantages of hydrophobic-super-oleophilic separation materials are easy to block the pore size, need to be deoiled after separation, and are not suitable for light oil-containing wastewater, and the limitations of the use of super-hydrophilic-underwater super-oleophobic materials. The specific scheme is as follows:

Method used

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  • Superhydrophilic-superoleophobic particle for oily sewage treatment as well as preparation method and application thereof
  • Superhydrophilic-superoleophobic particle for oily sewage treatment as well as preparation method and application thereof
  • Superhydrophilic-superoleophobic particle for oily sewage treatment as well as preparation method and application thereof

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preparation example Construction

[0043] A preparation method for superhydrophilic-superoleophobic particles for oily sewage treatment, comprising the following steps:

[0044] (1) Granular core material pretreatment: the granular core material is sieved, washed and dried for later use;

[0045] (2) Preparation of superhydrophilic-superoleophobic dispersion: dissolve perfluorocarboxylic acid in a solvent, then add film-forming aids, then add alkali, and complete the reaction to obtain superhydrophilic-superoleophobic dispersion; The molar ratio of the carboxyl group in the fluorocarboxylic acid to the hydroxyl group in the base is (1-2):1; the solvent includes ethanol or acetone, and the base includes sodium hydroxide, iron hydroxide or calcium hydroxide.

[0046] (3) Add the superhydrophilic-superoleophobic dispersion liquid into the dried particle core material, add micron-sized particle material and nano-sized particle material in turn, stir until completely dispersed, and then dry to obtain the super Hydr...

Embodiment 1

[0052] Dissolve 0.98g of perfluorononanoic acid in 20mL of acetone, add 0.04g of NaOH solid, stir until completely dissolved, then add 0.05g of propylene glycol, and stir magnetically at 1000r / min for 5min to obtain a superhydrophilic-superoleophobic dispersion liquid.

[0053] Take 200g of stainless steel sieved, cleaned and dried quartz sand and pour it into a stirring pot, then pour the superhydrophilic-superoleophobic dispersion into the quartz sand, stir, and at the same time add 3g of silicon with a particle size of 5-50μm Ash and 1.5g of SiO with a particle size of 10-50nm 2 , Stir for 5 minutes until completely dispersed. Put the stirred sample into a vacuum drying oven, and dry it at 55°C for 24 hours to obtain a superhydrophilic-superoleophobic quartz sand filter material.

Embodiment 2

[0055] Dissolve 0.92g of perfluorooctanoic acid in 20mL of absolute ethanol, and add 0.049g of Cu(OH) 2 , stirred until completely dissolved, then added 0.02g of polyvinylpyrrolidone, and stirred magnetically at 1000r / min for 5min to obtain a superhydrophilic-superoleophobic dispersion. Take 150g of stainless steel sieved, cleaned and dried river sand and pour it into a mixing pot, then pour the superhydrophilic-superoleophobic dispersion into the river sand, stir, and at the same time add 3g of powder with a particle size of 5-50μm Coal ash and 1.2g of TiO with a particle size of 10-50nm 2 , Stir for 5 minutes until completely dispersed. Put the stirred sample into a vacuum drying oven, and dry it at 55°C for 24 hours to obtain a superhydrophilic-superoleophobic river sand filter material.

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Abstract

The invention relates to a superhydrophilic-superoleophobic particle for oily sewage treatment as well as a preparation method and application thereof. The superhydrophilic-superoleophobic particle comprises a particle core material, a hydrophilic-oleophobic film and a micro-nano secondary coarse structure, wherein the surface of the particle core material is coated with the hydrophilic-oleophobic film, and the micro-nano secondary coarse structure exists on the surface of the film. The hydrophilic-oleophobic film is obtained by coating the surface of the particle material with superhydrophilic-superoleophobic dispersion liquid, and performing drying and curing; the micro-nano secondary coarse structure is obtained by sequentially adding a micron-scale particle material and a nano-scale particle material before a coating liquid coating the surface of the particle core material is dried and cured, and attaching the materials to the surface of the particle core material after drying; and the particle is applied to oil-water separation. Compared with the prior art, the particle has the advantages of simple and quick preparation process, large-scale production, high separation efficiency, convenience in repeated use, flexible application scene and the like, and has the advantages of wide application prospect and the like.

Description

technical field [0001] The invention relates to the field of oil-water separation materials, in particular to a superhydrophilic-superoleophobic particle for oily sewage treatment and a preparation method and application thereof. Background technique [0002] In recent years, with the frequent occurrence of offshore oil spill accidents and the continuous increase of industrial oily wastewater discharge, about 3.2 billion cubic tons of oil enters water bodies every year worldwide to form oily wastewater. In industries such as petroleum, chemical industry, steel, coking, home appliances, machinery manufacturing and food processing, all water that comes into direct contact with oil contains oil. Oily sewage not only seriously destroys the ecological balance of oceans and waters, pollutes the environment, causes great energy waste, but also seriously threatens human health. The treatment of oily wastewater is undoubtedly a win-win move that can solve environmental problems and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D17/022B01D17/04C02F1/40
CPCB01D17/047C02F1/40
Inventor 张雄朱国鑫
Owner TONGJI UNIV
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