Hydrophobic-superoleophylic sponge as well as preparation method and application thereof

A super-oleophilic and sponge technology, applied in separation methods, chemical instruments and methods, liquid separation, etc., can solve the problem of loss of hydrophobic and lipophilic properties on the surface of materials, affecting selectivity and reusability, and complicated operation of the modification process and other problems, to achieve the effect of excellent separation ability, convenient large-scale production, and short experimental cycle

Active Publication Date: 2018-11-16

HUNAN AGRICULTURAL UNIV

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AI-Extracted Technical Summary

Problems solved by technology

However, these modified sponges have fatal problems such as poor mechanical stability during use: slight friction and touch will cause the surface of the material to lose hydr...

Method used

Characterize the hydrophobic-super-lipophilic performance of the hydrophobic-super-lipophilic sponge prepared by the present embodiment, add methylene blue in water, add Sudan III in soybean oil, the two are dropped on the hydrophobic-super-lipophilic sponge surface, the result As shown in Figure 3, A is water (blue droplets), and B is soybean oil (red). It can be seen...

Abstract

The invention discloses a hydrophobic-superoleophylic sponge as well as a preparation method and application thereof. The hydrophobic-superoleophylic sponge is prepared by loading modified kaolin ontoa melamine sponge which is used as a carrier. The preparation method comprises the following steps of (1) washing the melamine sponge by ethyl alcohol and water, and drying for further use; (2) modifying the kaolin powder; (3) preparing a silylated modified kaolin turbid liquid; (4) soaking the pretreated melamine sponge by the silylated modified kaolin turbid liquid, so as to obtain the hydrophobic-superoleophylic sponge. The hydrophobic-superoleophylic sponge has the advantages that the adsorption capacity is high, the adsorption speed is quick, and the separation and recycling are easy; the preparation method is simple and efficient, and the cost is low; the hydrophobic-superoleophylic functional sponge material has good oil/organic solvent and water separating ability, and can be usedfor selectively adsorbing the oily liquid, and separating the oil and water.

Application Domain

Liquid separation

Technology Topic

ChemistryOrganic solvent +2

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Examples

Experimental program(5)

Example Embodiment

[0034] A method for preparing the hydrophobic-super lipophilic sponge of the present invention includes the following steps:

[0035] (1) Sponge pretreatment: The melamine sponge is washed three times with 75%-100% ethanol and water, and then placed in an oven at 50-80°C and dried for 12-24 hours.

[0036] (2) Modification of kaolin: 0.15~0.3g perfluorooctanoic acid (PFOA) and 0.015~0.03g sodium hydroxide are added to 3~6mL ethanol and stirred to dissolve, then 1.5~3g kaolin (chemically pure) is added, ultrasonic for 10~20min , The mixed solution was transferred to a round-bottomed flask and placed in a preheated water bath (52°C). Subsequently, 0.05-0.1 mL diethoxydimethylsilane (DEDMS) was added to the mixed solution, stirred and reacted For 0.5 to 1 h, the obtained product solution is placed in an oven at 50 to 80° C. and dried for 1 to 2 hours to obtain modified kaolin powder.

[0037] (3) Preparation of silanized modified kaolin suspension: take the modified kaolin powder processed in step (2) and disperse it in distilled water to prepare a 1mg/mL~1.5mg/mL modified kaolin solution, ultrasonically 1 ~1.5h, then add 0.5~1mL 3-aminopropyltriethoxysilane (APTES) and stir for 10~20min.

[0038] (4) Soaking: immerse the sponge pretreated in step (1) in the silanized modified kaolin suspension for 5s-15s, squeeze the soaked sponge, and then immerse the squeezed sponge into the silanized modified Soak the kaolin suspension for 1~2h, take out the sponge and wash the excess silanized modified kaolin with deionized water, put it in an oven at 50~80℃, and dry for 12~24h to obtain the hydrophobic-super lipophilicity of the present invention sponge.

[0039] The hydrophobic-super-lipophilic sponge prepared by the invention can effectively separate oil/organic solvent and water and can be recycled. Oil/organic solvents include methanol, ethanol, isopropanol, acetone, kerosene, ethyl propyl ether, n-hexane, diesel, lubricating oil, soybean oil, etc.

Example Embodiment

[0040] Example 1:

[0041] The hydrophobic-super-lipophilic sponge of the present invention is mainly prepared by using melamine sponge as a carrier and loading modified kaolin in the melamine sponge. The modified kaolin mainly adopts a solvent volatilization method. Perfluorooctanoic acid (PFOA) is modified.

[0042] A method for preparing the hydrophobic-super lipophilic sponge of the present implementation includes the following steps:

[0043] (1) Pretreatment of the sponge: First, the 2cm×2cm×2cm melamine sponge was washed three times with 100% ethanol and water, placed in an oven at 50°C, and dried for 24h.

[0044] (2) Modification of kaolin: add 0.15g perfluorooctanoic acid (PFOA) and 0.015g sodium hydroxide to 3.6mL ethanol and stir to dissolve, then add 1.5g kaolin powder Kaolin, sonicate for 20min, and transfer the mixture to a round bottom flask , Placed in a preheated water bath (52℃), then, add 0.05mL diethoxydimethylsilane (DEDMS) into the mixed solution, stir, react for 0.5h, and place the resulting product solution at 50℃ Dry in an oven for 2 hours to obtain modified kaolin powder.

[0045] (3) Preparation of silanized modified kaolin suspension: weigh 0.1g of the modified kaolin powder treated in step (2), dissolve it in 100mL of distilled water (1mg/mL), sonicate for 1h, and then add 0.5mL of 3- Aminopropyltriethoxysilane (APTES) was stirred for 10 minutes to obtain a silanized modified kaolin suspension.

[0046] (4) Soaking: immerse the pretreated melamine sponge in step (1) in the silanized modified kaolin suspension for 15s, squeeze the soaked sponge, and then immerse the squeezed sponge into the kaolin suspension Soak the sponge for 1.5h, take out the sponge and wash the excess silanized modified kaolin with deionized water, place it in an oven at 80°C, and dry for 24h to obtain a hydrophobic-super-lipophilic sponge.

[0047] The contact angle of the hydrophobic-super-lipophilic sponge prepared in this example with water is as figure 1 Shown. It can be seen from the figure that the contact angle is 143.7°, indicating that the sponge prepared by the present invention has hydrophobic properties.

[0048] The scanning electron micrograph of the hydrophobic-super-lipophilic sponge prepared in this example is as follows figure 2 Shown. The scanning electron microscope picture clearly shows that the kaolin particles are successfully loaded on the sponge skeleton, and the roughness of the sponge skeleton is significantly improved.

[0049] To characterize the hydrophobic-super-lipophilic properties of the hydrophobic-super-lipophilic sponge prepared in this example, methylene blue was added to water and Sudan III was added to soybean oil, and the two were dropped on the surface of the hydrophobic-super-lipophilic sponge. The results are as follows image 3 As shown, A is water (blue droplets) and B is soybean oil (red). It can be seen from the figure that the water droplets are not immersed in the sponge, but soybean oil is quickly absorbed into the sponge, indicating that the hydrophobic-super-lipophilic sponge prepared by the present invention has very good hydrophobic-super-lipophilic properties and can be widely used in oil-water separation or Other organic solvents are being separated from water.

Example Embodiment

[0050] Example 2:

[0051] A method for preparing the hydrophobic-super lipophilic sponge of the present invention includes the following steps:

[0052] (1) Pretreatment of the sponge: First, the 2cm×2cm×2cm melamine sponge was washed three times with 100% ethanol and water, placed in an oven at 50°C, and dried for 24h.

[0053] (2) Modification of kaolin: add 0.15g perfluorooctanoic acid (PFOA) and 0.015g sodium hydroxide to 3.6mL ethanol and stir to dissolve, then add 1.5g kaolin powder Kaolin, sonicate for 20min, and transfer the mixture to a round bottom flask , Placed in a preheated water bath (52℃), then, add 0.05mL diethoxydimethylsilane (DEDMS) into the mixed solution, stir, react for 0.5h, and place the resulting product solution at 50℃ Dry in an oven for 2 hours to obtain modified kaolin powder.

[0054] (3) Preparation of silanized modified kaolin suspension: weigh 0.15g of the modified kaolin powder treated in step (2) and disperse it in 100mL of distilled water (1.5mg/mL), sonicate for 1h, and add 1mL of 3- Aminopropyltriethoxysilane (APTES), stirring for 10 min.

[0055] (4) Soaking: Immerse the pretreated melamine sponge in step (1) in the silanized modified kaolin suspension for 15s, squeeze the soaked sponge, and then immerse the squeezed sponge into the silanized modified Soak in the kaolin suspension for 2 hours, take out the sponge and wash the excess silanized modified kaolin with deionized water, place it in an oven at 80°C, and dry for 24 hours to obtain a hydrophobic-super lipophilic sponge.

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Hydrophobic-superoleophylic sponge as well as preparation method and application thereof

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

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Examples

Example Embodiment

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Example Embodiment

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Description & Claims & Application Information

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