Super-hydrophilic and under-water super-oleophobic ceramic film and preparation method thereof

An underwater super-oleophobic and ceramic membrane technology, applied in separation methods, chemical instruments and methods, membranes, etc., can solve the unfavorable super-hydrophilic interface construction of nanotube structure, poor stability of super-hydrophilicity, and affect the use Longevity and other issues, to achieve the effect of abundant raw materials, easy mass production, and high reuse rate

Active Publication Date: 2017-09-29
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the durability of titanium dioxide in the titanium dioxide photocatalytic self-cleaning ceramics prepared by this method is low, and it is easy to be poisoned and deactivated, which affects its service life.
In 2015, Li et al prepared TiO on the surface of foamed titanium by anodic oxidation. 2 Nanotubes are used for oil-water separation, but the superhydrophilic stability mentioned in this method is not good; at the same time, the nanotube structure is not conducive to the construction of superhydrophilic interfaces (J.Mater.Chem.A, 2015, 3, 1279)

Method used

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  • Super-hydrophilic and under-water super-oleophobic ceramic film and preparation method thereof
  • Super-hydrophilic and under-water super-oleophobic ceramic film and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0034] In this embodiment, the ceramic membrane is based on a porous alumina ceramic sheet, and nano-scale columnar titanium dioxide is arranged on the surface of the substrate to form a titanium dioxide nano-array on the surface of the substrate.

[0035] The preparation method of the ceramic membrane is as follows:

[0036] (1) Step 1: Soak the porous alumina ceramic sheet in a solvent for ultrasonic cleaning to remove stains and grease on the surface of the ceramic sheet, and then dry;

[0037] (2) Step 2: Fix the cleaned ceramic sheet on the magnetron sputtering equipment, use metal titanium as the target material, control the sputtering time for 2 hours, and obtain the ceramic sheet coated with titanium on the surface;

[0038] (3) Step 3: configure the oxidation solution, specifically: stir 3ml of 63% concentrated nitric acid, 70ml of 30% hydrogen peroxide, and 80mg of melamine at a temperature of 80°C until the melamine is completely dissolved;

[0039] (4) Step 4: Put...

Embodiment 2

[0047] In this embodiment, the structure of the ceramic membrane is similar to that of Embodiment 1. The porous alumina ceramic sheet is used as the substrate, and nano-scale columnar titanium dioxide is arranged on the surface of the substrate, forming a titanium dioxide nano-array on the surface of the substrate.

[0048] The preparation method of the ceramic membrane is basically the same as the preparation method in Example 1, except that in the process of configuring the oxidation solution in step 3, the addition amount of 63% concentrated nitric acid is 1 ml.

[0049] The SEM images of the ceramic membranes prepared above are similar to figure 1 As shown, nanoscale titanium dioxide is arranged on the surface of the substrate to form a titanium dioxide nano-array.

[0050]The ceramic membrane prepared above was tested for water contact angle in air, underwater chloroform contact angle test, and oil-water separation efficiency test. The test method is the same as the meth...

Embodiment 3

[0053] In this embodiment, the structure of the ceramic membrane is similar to that of Embodiment 1. The porous alumina ceramic sheet is used as the substrate, and nano-scale columnar titanium dioxide is arranged on the surface of the substrate, forming a titanium dioxide nano-array on the surface of the substrate.

[0054] The preparation method of the ceramic membrane is basically the same as the preparation method in Example 1, except that in the process of configuring the oxidation solution in step 3, the addition amount of 63% concentrated nitric acid is 5 ml.

[0055] The SEM image of the above-mentioned ceramic membrane is as follows: Figure 4 As shown, nanoscale titanium dioxide is arranged on the surface of the substrate to form a titanium dioxide nano-array.

[0056] The ceramic membrane prepared above was tested for water contact angle in air, underwater chloroform contact angle test, and oil-water separation efficiency test. The test method is the same as the met...

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Abstract

The invention provides a super-hydrophilic and under-water super-oleophobic ceramic film. A porous ceramic film is used as a substrate; nanometer cylindrical titanium dioxide is arranged on the surface of the substrate; a titanium dioxide nanometer array is formed. The static contact angle of the ceramic film structure on water is smaller than 10 degrees; the contact angle on oil under the water is greater than 150 degrees; the ceramic film can be used as an oil water separation film; an excellent oil-water separation effect and fouling resistance effects are achieved. The invention also provides a method for preparing the super-hydrophilic and under-water super-oleophobic ceramic film. According to the method, firstly, a metal titanium plating layer is prepared on the surface of the porous ceramic film as the substrate; then, an oxidizing solution prepared from oxyful, nitric acid and melamine is used for oxidization; the ceramic film with the titanium dioxide nanometer array is obtained. The method is simple; the implementation is easy; the obtained ceramic film has the super-hydrophilic and under-water super-oleophobic performance.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a superhydrophilic and underwater superoleophobic ceramic membrane and a preparation method thereof. Background technique [0002] Membrane separation is a contemporary high-efficiency separation technology, which is widely used in environmental protection, sewage treatment, biomedicine and other fields, providing a new way for circular economy production. Ceramic membrane is a separation membrane made of high-temperature sintered ceramic material. Due to its unique strength and corrosion resistance, it has become one of the fastest-growing and most promising varieties in the membrane field as soon as it enters the market. [0003] With the in-depth study of special wetting surfaces in nature, the preparation methods of special wetting surfaces are emerging. Most of the reported methods so far focus on separating oil from water. In the prior art, cerami...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D69/02B01D67/00B01D17/022
CPCB01D17/02B01D67/0039B01D69/02B01D71/02B01D71/024B01D2325/36
Inventor 曾志翔张大为王刚赵文杰王立平薛群基
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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