A kind of 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
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Embodiment 1
[0032] Embodiment 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 pre...
Embodiment 2
[0043] Embodiment 2: The preparation method of the cellulose sponge adopted in this embodiment is basically the same as that of the cellulose sponge in embodiment 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 sub-layer 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 separat...
Embodiment 3
[0046] Embodiment 3: The preparation method of the cellulose sponge adopted in this embodiment is basically the same as that of the cellulose sponge in embodiment 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 2~14µm.
[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 performan...
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Abstract
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