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Environment-friendly mild preparation method of hydrophobic lipophilic sponge

A lipophilic and sponge technology, which is applied in the field of environmentally friendly and mild preparation of hydrophobic and lipophilic sponges, can solve the problems of difficult industrial production, limited practical application, strong corrosiveness and high toxicity, etc., and achieves the effects of mild conditions, outstanding elasticity and efficient recovery.

Inactive Publication Date: 2019-09-17
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, in the process of preparing graphene melamine sponge, graphene oxide is often used as raw material, and hydrazine hydrate, a highly corrosive and highly toxic reducing agent, is mostly used in the process of reducing graphene oxide, resulting in large-scale industrial Production difficulties severely limit practical application

Method used

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  • Environment-friendly mild preparation method of hydrophobic lipophilic sponge
  • Environment-friendly mild preparation method of hydrophobic lipophilic sponge
  • Environment-friendly mild preparation method of hydrophobic lipophilic sponge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1 Preparation of HDTMS-rGO@MF sponge

[0042] 1) Preparation of graphene oxide

[0043] Prepared according to a modified Hummers method. The preparation of specific graphene oxide is divided into three stages, namely ice bath stage, medium temperature stage and high temperature stage.

[0044]Ice-bath stage: first mix 2g of graphite powder and 1g of sodium nitrate in a 1L glass flask in an ice-water bath at around 0°C, then carefully add 50mL of concentrated sulfuric acid (98wt%), and then slowly magnetically stir the mixture to prevent the mixture from It splashed onto the glass wall and formed a uniform black-gray dispersion after stirring for 10 minutes. Then add 7 g of KnMO in batches 4 , The speed of adding potassium permanganate should be controlled to prevent the temperature of the mixed solution from exceeding 20°C. After the addition, continue to stir for half an hour, and finally form a dark green mixed solution.

[0045] Medium temperature stage: ...

Embodiment 2

[0052] Embodiment 2 prepares the condition optimization of superhydrophobic sponge

[0053] GO@MF impregnated in HDTMS / ethanol solution was dried under different temperature conditions, such as figure 1 shown. On the one hand, drying promotes the volatilization of the organic solvent ethanol; on the other hand, the temperature affects the reduction degree of GO. At a lower temperature of 120 °C, the GO coated on the MF sponge still retains a large amount of brown color, indicating that most of the GO has not been reduced. As the temperature increases, the color of GO on the MF surface fades rapidly to black, which is a direct evidence of the reduction of GO. At 140 °C, the water repellency angle of the modified MF sponge reaches the maximum. Continue to increase the temperature, but will reduce the contact angle of MF. It may be related to the fact that the reduced GO tends to be denser, the wrinkled surface becomes flatter, and the roughness of the MF sponge is reduced. ...

Embodiment 3

[0057] Example 3 Characterization of HDTMS-rGO@MF sponge

[0058] The surface morphology of the original MF and the modified HDTMS-rGO@MF was observed with a Quanta 400FEG thermal field emission scanning electron microscope produced by FEI, USA. Before testing, the dried samples were sprayed with gold on the surface of the samples by ion sputtering.

[0059] The morphology characteristics of blank MF and HDTMS-rGO@MF were observed by SEM. Such as Figure 5 As shown in (a), the blank MF displays a 3D interconnected porous structure with pore sizes ranging from tens to hundreds of micrometers, and the rich pore structure is important for the internal transport and circulation of substances. A clean and smooth skeleton of blank MF can be found in Figure 5 observed in (b) and 5(c). However, after coating with graphene oxide solution and HDTMS modification, as Figure 5 In (d), the topography of the interior and exterior of the sponge shows wrapped rGO flakes and disordered s...

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Abstract

The invention discloses an environment-friendly mild preparation method of a hydrophobic lipophilic sponge. The method comprises the following steps: by using a solution soaking method, carrying out hydrophobic modification on a graphene oxide wrapped melamine sponge by using hexadecyl trimethoxy silane / ethanol, and further carrying out high-temperature thermal reduction, so as to obtain the hydrophobic lipophilic sponge. The prepared sponge has a surface contact angle greater than 150 degrees with a water droplet, and is capable of enduring deformation of 10-70%. The graphene / melamine sponge is used for adsorbing various types of oil and organic solvents, has an adsorption capacity of 8.8-20.9 times of the weight of the sponge itself, and in addition is excellent in circulation adsorption capability. In the preparation process, the grafting reaction of the hexadecyl trimethoxy silane can be implemented at a normal temperature, the operation process is simple, and the condition is mild. A reduction agent is not needed, only high-temperature thermal reduction is implemented, the reduction temperature is 140 DEG C, the reduction time is 12 hours, the reduction temperature is low, the reduction cycle is short, materials are environment-friendly, the environment can be protected, and large-scale industrial production can be easily achieved.

Description

technical field [0001] The invention relates to the field of water treatment materials, in particular to an environmentally friendly and mild preparation method of a hydrophobic and lipophilic sponge. Background technique [0002] With the rapid development of the petrochemical industry, oil spills, organic chemical leakage accidents and oily wastewater discharges occur frequently in the production, transportation, processing and use of petroleum and organic chemicals, which have caused serious ecological damage. and environmental pollution issues. In addition, this oil and organic chemical solvent pollution will also affect human health indirectly through the food chain. The adsorption method has many characteristics such as simple operation, low cost, and environmental friendliness, and is considered to be one of the most effective methods for oil spill cleanup. Therefore, there is an urgent need to develop effective oil-absorbing materials. [0003] In recent years, re...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F101/32
CPCB01J20/20B01J20/22B01J20/262B01J2220/46B01J2220/4806B01J2220/4812C02F1/283C02F1/285C02F2101/32
Inventor 乔维川刘海
Owner NANJING FORESTRY UNIV
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