Superhydrophilic-superoleophobic cellulose sponge and preparation method thereof

A cellulose sponge and super-hydrophilic technology, applied in the direction of cellulose plastic layered products, separation methods, chemical instruments and methods, etc., can solve the problems of complex preparation process, expensive materials, and resistance to acid and alkali corrosion , to achieve the effect of high reusability, simple preparation method and green raw materials

Active Publication Date: 2016-07-20
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above technical solutions have good oil-water separation effects, the complexity of the preparation process, the high price of the materials, the inability to resist acid and alkali corrosion, and the reduction of the oleophobic effect of the coating after abrasion have limited its wide application.
Moreover, these macroporous membranes or metal meshes can only separate emulsions with oil droplets larger than 20 μm

Method used

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  • Superhydrophilic-superoleophobic cellulose sponge and preparation method thereof
  • Superhydrophilic-superoleophobic cellulose sponge and preparation method thereof
  • Superhydrophilic-superoleophobic cellulose sponge and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: The preparation method of present embodiment cellulose sponge comprises the following steps:

[0033] Step 1: Prepare 100 g of zinc chloride aqueous solution with a mass fraction of 67%.

[0034] Step 2: Slowly add 3g of cellulose powder into the cellulose solution in step 1, stir until the cellulose powder is completely dissolved, and the solution is colorless and transparent, divide it into two parts for later use, and record them as C1 and C2;

[0035] Step 3: Add 0.4g of reinforcing fiber and 60g of anhydrous sodium sulfate to the C1 cellulose solution (80g) in step 2, and keep stirring to make it evenly dispersed, and record it as C3;

[0036] Step 4: Pour the C3 cellulose solution in step 3 with a thickness of 1mm into the mold, spread it, and let it stand, then pour the C2 solution in step 2 with a thickness of 5mm on it, and let it stand for 30mim;

[0037] Step 5: Put the cellulose sol obtained in step 4 into deionized water for reverse phase prec...

Embodiment 2

[0043] Example 2: The preparation method of the cellulose sponge adopted in this example is basically the same as that of the cellulose sponge in Example 1, except that the consumption of cellulose powder is 5 g.

[0044] The double-layer structure of the sponge is the same as the double-layer structure of the cellulose sponge in Example 1, the nanopore diameter of the surface layer is 0.3-0.5 μm, and the micropore diameter of the sublayer is 2-14 μm.

[0045] The breaking strength test shows that the breaking strength of the sponge is about 1.7MPa. The moisture absorption test shows that the moisture absorption rate of the sponge can reach 7 times, and the moisture retention rate can reach 4.5 times. The porosity test shows that the sponge has a porosity of 70% and an air permeability of 50%. The water flux test shows that the water flux of the sponge is 150Lm-2h only under the action of gravity. The cellulose sponge prepared above was tested for oil-water separation perf...

Embodiment 3

[0046] Example 3: The preparation method of the cellulose sponge adopted in this example is basically the same as that of the cellulose sponge in Example 1, except that the consumption of cellulose powder is 8g.

[0047] The double-layer structure of the sponge is the same as that of the cellulose sponge in Example 1, and the nanopore diameter of the surface layer is 0.2-0.5 μm. The micropore diameter of the sublayer is 2-14 μm.

[0048] The breaking strength test shows that the breaking strength of the sponge is about 1.1 MPa. The moisture absorption performance test shows that the moisture absorption rate of the sponge can reach 4 times, and the moisture retention rate can reach 2 times. The porosity test shows that the sponge has a porosity of 55% and an air permeability of 35%. The water flux test shows that the water flux of the sponge is 120Lm-2h only under the action of gravity. The cellulose sponge prepared above was tested for oil-water separation performance. Th...

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Abstract

The invention discloses a superhydrophilic-superoleophobic cellulose sponge and a preparation method thereof. A plurality of nano-grade holes are distributed on the surface of the cellulose sponge. Micron-grade holes are communicated to the nano-grade holes from below. The micron-grade holes are communicated with each other. The preparation method comprises the following steps: within a certain temperature range, cellulose is dissolved in a non-derivative solvent; and two layers are compounded; no further chemical modification is needed, and the obtained product is cured only through phase transformation; and washing and freeze drying are carried out, such that the cellulose sponge is obtained. The cellulose sponge provided by the invention shows unique underwater superoleophobic property and highly efficient oil-water separation rate upon different oils and organic solvents. The cellulose sponge has stable superoleophobic, antifouling and self-cleaning properties under highly-acid, high-alkali and highly-salinity environments. The preparation process is simple and is easy to realize. The raw materials are green, and have rich sources. The cost is low. The cellulose sponge can be used in various fields such as industrial oil-water (oil-water emulsion) large-scale separation and purification, organic liquid/water large-scale filtration and separation, and the like.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a superhydrophilic-superoleophobic cellulose sponge and a preparation method thereof. The cellulose sponge is mainly used for oil-water separation. Background technique [0002] With the development of modern industry, agriculture, and production and life, the scope of water pollution is increasing in both developing countries and developed countries, and oily sewage is one of them. Oily sewage mainly includes waste oil from the catering industry, petrochemical industry Oily wastewater from enterprises, oily wastewater from daily life, and oil spills in oceans, etc. Benzene substances in oil directly threaten human health, however, the amount of these oil pollutants has far exceeded the natural purification ability. The treatment of oily sewage has also attracted more and more attention. In recent years, people have designed and invented many functional...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L1/02C08J9/26B32B23/04B32B5/18C02F1/40
Inventor 曾志翔乌学东薛群基张琳王刚王赫贺怡
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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