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Preparation method of super-hydrophobic foam iron surface and application of super-hydrophobic foam iron in oily wastewater treatment

A foamed iron, super-hydrophobic technology, applied in heat treatment furnaces, separation methods, heat treatment equipment, etc., can solve the problems of high temperature resistance, limitation, complicated preparation process of polymer binders, etc., and achieve good mechanical stability, oil and water. The effect of high separation efficiency and simple process steps

Active Publication Date: 2021-06-18
ZHOUKOU NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process of the two-step construction method is complicated and cumbersome, and the environmental pollution problem caused by the organic modification soaking solution is relatively serious
In the one-step construction method, there is only a mechanical physical bond between the coating or film and the metal substrate, without the formation of covalent bonds, and there is no good adhesion. Therefore, the stability of superhydrophobic materials is very poor.
Although the addition of polymer adhesives can enhance the bonding force, the polymer adhesives are not resistant to high temperatures, and the superhydrophobic materials prepared after adding them cannot adapt to the harsh outdoor practical application environment, and are limited in practical applications.

Method used

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  • Preparation method of super-hydrophobic foam iron surface and application of super-hydrophobic foam iron in oily wastewater treatment
  • Preparation method of super-hydrophobic foam iron surface and application of super-hydrophobic foam iron in oily wastewater treatment
  • Preparation method of super-hydrophobic foam iron surface and application of super-hydrophobic foam iron in oily wastewater treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Fold the foam iron with a cell density of 100ppi into a boat shape ( figure 1 ), placed in absolute ethanol solution for ultrasonic cleaning for 10 minutes, then transferred to 1 mol / L hydrochloric acid solution for 10 minutes of ultrasonic cleaning, and finally deionized water for 10 minutes of ultrasonic cleaning. Put the pretreated foam iron into 0.500mol / L FeCl 2 4H 2 The mixed solution of O and 0.033mol / L hexamethylenetetramine is transferred to a hydrothermal kettle, and the temperature of the oven is set to 160°C for 6 hours of reaction. After the reaction, it is naturally lowered to room temperature, and the iron foam is taken out and placed in 80°C. Dry in an oven for 12 hours. The surface of the iron foam after the hydrothermal synthesis reaction is covered with a regular honeycomb structure, and the nanosheets forming the honeycomb structure are perpendicular to the surface of the iron foam substrate, and the thickness of each nanosheet is about 20-40nm ( ...

Embodiment 2

[0042] Fold iron foam with a pore density of 100ppi into a boat shape, put it in absolute ethanol solution and ultrasonically clean it for 10 minutes, then transfer it to 1mol / L hydrochloric acid solution to continue ultrasonic cleaning for 10 minutes, and finally use deionized water to ultrasonically clean it for 10 minutes. Put the pretreated foam iron into 0.333mol / L FeCl 3 ·6H 2 The mixed solution of O and 0.033mol / L hexamethylenetetramine is transferred to a hydrothermal kettle, and the temperature of the oven is set to 160°C for 6 hours of reaction. After the reaction, it is naturally lowered to room temperature, and the iron foam is taken out and placed in 80°C. Dry in an oven for 12 hours. After hydrothermal synthesis, the surface of the iron foam is covered with a layer of dense honeycomb structure, and the nanosheets forming the honeycomb structure are perpendicular to the surface of the iron foam substrate, and the thickness of each nanosheet is about 20-30nm ( I...

Embodiment 3

[0045] Using the hydrothermal synthesis method described in Example 1, replace the iron foam to be treated with a pore density of 20ppi, put the iron foam dried after the hydrothermal reaction into a tube furnace for precise atmosphere heat treatment, and the heat treatment temperature is 400°C , the heat treatment atmosphere is molar ratio H 2 : CO=1, heat treatment space velocity is 3000h -1 , The heat treatment time is 72h, and the heat treatment pressure is 0.1MPa. After the heat treatment, it was naturally lowered to room temperature under the atmosphere to obtain superhydrophobic iron foam.

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Abstract

The invention discloses a preparation method and process of a super-hydrophobic foam iron surface. The preparation method comprises the following steps of (1) pre-treating foam iron to be treated, sequentially putting the foam iron to be treated into absolute ethyl alcohol, diluted hydrochloric acid and deionized water, and respectively carrying out ultrasonic cleaning for 10 minutes; (2) putting the pretreated foam iron into an aqueous solution of ferric salt and hexamethylenetetramine, carrying out hydrothermal reaction, then naturally cooling to room temperature, taking out the foam iron, and drying; and (3) carrying out precise atmosphere heat treatment on the dried foam iron, and obtaining the foam iron with the super-hydrophobic surface. After the foam iron with the super-hydrophobic surface is stored in a room temperature environment for two years, the contact angle between the surface and water can still reach 150 degrees or above, and the rolling angle is smaller than 10 degrees. According to the method, surface super-hydrophobicity can be achieved without modification of low-surface-energy organic matter fluorosilane and the like, the method is simple, effective and environmentally friendly, the hydrophobic layer is firmly combined with a rough micro-nano structure on the surface of the foam iron, falling is not likely to happen, mechanical stability is good, and practical application of the super-hydrophobic surface is facilitated.

Description

technical field [0001] The invention relates to the field of surface treatment and modification of metal materials, in particular to a method for preparing the surface of superhydrophobic iron foam and its application in oily wastewater treatment. Background technique [0002] Based on interface science and bionics, the special wettability of materials can be adjusted to obtain a super-hydrophobic and super-oleophilic surface, so that the material has opposite wettability to water and oil, allowing the oil phase to selectively permeate in the oil-water two-phase, while water The phase is selectively intercepted, and it is widely used in the treatment of oily wastewater. Metal substrates such as stainless steel mesh, copper mesh, nickel mesh, metal foam, etc. have high mechanical strength, can be mass-produced, and the surface is easy to be processed. They are currently the most widely used type of oil-water separation material substrates. Based on this type of metal substrat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C26/00C21D1/74C21D9/00C02F1/40
CPCC23C26/00C21D1/74C21D9/0068C02F1/40Y02A20/204
Inventor 薛莹莹陈亚红赵辉段胜阳刘增臣王筠
Owner ZHOUKOU NORMAL UNIV
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