CN115010975B - Advanced cellulose material for efficient water mist collection, preparation method and application - Google Patents
Advanced cellulose material for efficient water mist collection, preparation method and application Download PDFInfo
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- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
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- C08B3/08—Preparation of cellulose esters of organic acids of monobasic organic acids with three or more carbon atoms, e.g. propionate or butyrate
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- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
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- C08J2327/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
- C08J2327/12—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
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- C08J2401/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
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Abstract
The advanced cellulose material for efficient water mist collection, the preparation method and the application thereof provided by the invention take the cut hydrophobic polymer film as a framework, the framework comprises a vertical rectangular channel, two sides of the vertical rectangular channel are respectively provided with a plurality of triangles, the triangles on the two sides are respectively in asymmetric arrangement, and amphiphilic cellulose derivatives modified by hydrophobic groups are used as a coating to be coated on the surface of each triangle. The invention imitates the biological characteristics of the prickly pear and the coleoptera of the beetles, and accelerates the aggregation and the falling of the fogdrops by utilizing the double bionic principle. Compared with the traditional mist collection surface, the invention adopts cheap and green renewable cellulose as the amphiphilic coating raw material, has simple preparation method, can further enhance the water collection efficiency by the electrostatic adsorption effect existing on the surface, and is suitable for popularization.
Description
Technical Field
The invention relates to the technical field of high-value utilization of lignocellulose biomass, in particular to an advanced cellulose material for efficient water mist collection, a preparation method and application.
Background
With the world population growing and energy consumption, the increasingly severe shortage of water resources presents unprecedented challenges to the scientific and engineering community. Atmospheric water is a ubiquitous environmental source with a content of about 1.29x10 16 kg, which corresponds to three times the total annual water consumption worldwide. There is increasing interest in developing new technologies for atmospheric water capture as a source of clean water. Among them, mist collection is a typical air-water capture scheme, enabling rapid on-site production. The collection mode is inspired by the original biological adaptive evolution to cope with the biological characteristics of the severe environment. Thorns providing surface energy gradients and asymmetric curvatures, e.g. cactusThe desert beetles provide a coleoptera of hydrophilic and hydrophobic surface chemistry, the nepenthes have smooth surface inner walls, etc. Thus, the smart imitation of these interesting biological features is an effective way to alleviate water resource shortages.
The process of mist collection mainly includes mist trapping (droplet nucleation) and droplet transport (droplet removal). A single biomimetic-based surface may be limited in some way during mist collection. If the hydrophilicity of the asymmetric spike surface causes a water film shielding phenomenon, the super-hydrophilic/hydrophobic surface regionalized droplets need to be larger than the critical size to fall off, and the smooth surface hydrophobic lubricating oil can prevent mist capture. Therefore, the ingenious combination of various bionic principles designs a synergistic liquid drop nucleation and removal mechanism, and the realization of simplified large-scale preparation is important. In addition, electron transfer has been demonstrated to exist in the liquid to solid contact process. In theory, mist is also present on the collector surface or during transport of the water droplets, which are affected by charge interactions. However, few have made effective use of the interfacial interactions of the water collection process.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects in the prior art, and provide an advanced cellulose material for efficient water mist collection, which comprises the following specific scheme:
the advanced cellulose material uses a cut hydrophobic polymer film as a framework, the framework comprises a vertical rectangular channel, two sides of the vertical rectangular channel are respectively provided with a plurality of triangles, the triangles on the two sides are respectively in asymmetric arrangement, and amphiphilic cellulose derivatives modified by hydrophobic groups are used as a coating to be coated on the surface of each triangle.
Further, the thickness of the hydrophobic polymer film is 10-2000 mu m, the height of the triangle is 1-50 mm, the width of the triangle is 0.3-20 mm, the included angle between the triangle and the vertical rectangular channel is 10-170 degrees, the width of the vertical rectangular channel is 0.5-20 mm, the vertical spacing between the triangles on the same side is 0-100 mm respectively, and the vertical spacing between the triangle and the triangle on the opposite side is 0-100 mm respectively.
Further, the hydrophobic polymer film is a fluorine-based polymer film, and the fluorine-based polymer film is any one of Polytetrafluoroethylene (PTFE), polytrifluoroethylene (PCTFE), polyvinylidene fluoride (PVDF), and polyvinyl fluoride propylene (FEP).
Further, the loading capacity of the hydrophobic group modified amphiphilic cellulose derivative coating is 1-50 mg/cm 2 。
Further, the long-chain alkyl group-containing compound is 10-undecylenoyl chloride.
Further, the coating process comprises the following steps: 5-50 mu L of amphiphilic cellulose derivative solution with the concentration of 5-40 mg/mL is sucked by a liquid-transfering gun, and each triangle surface is respectively coated with 1-5 times.
The preparation method of the amphiphilic cellulose derivative modified by hydrophobic groups in the advanced cellulose material for efficient water mist collection is characterized in that the amphiphilic cellulose derivative modified by hydrophobic groups is obtained by taking microcrystalline cellulose as a matrix and adopting a compound containing long-chain alkane to chemically modify long-chain alkane groups of the microcrystalline cellulose, and the chemical modification process comprises the following steps: the weight ratio of the long-chain alkyl group-containing compound to the microcrystalline cellulose is 1:1 to 5, the reaction time is 0.5 to 8 hours, the temperature is 30 to 120 ℃ for reaction and purification, and then the mixture is stored in a solution/suspension form or dissolved in tetrahydrofuran solution.
The application of the advanced cellulose material for efficient water mist collection in efficient water mist collection.
The skeleton preparation method for the advanced cellulose material for efficient water mist collection comprises the following steps: after the hydrophobic polymer film is washed by acetone, deionized water and ethanol solution in sequence, a laser cutting machine is used for cutting the structure of triangular and vertical rectangular channels for 1-10 times at the laser power of 2% -40% and the moving speed of 5% -60%.
THE ADVANTAGES OF THE PRESENT INVENTION
(1) According to the invention, the hydrophobic polymer film is cut into the vertical rectangular channel, a plurality of triangles which are asymmetrically arranged are respectively arranged on two sides of the vertical rectangular channel, and then the amphiphilic cellulose derivative modified by the hydrophobic group is coated on the surface of each triangle, so that the efficiency and stability of water mist collection are improved, the advanced cellulose material imitates the biological characteristics of cactus thorns and beetle coleopterans, and the aggregation and falling of fog drops are accelerated by utilizing the double bionic principle. Compared with the traditional mist collection surface, the invention adopts cheap and green renewable cellulose as the amphiphilic coating raw material, has simple preparation method, and can further enhance the water collection efficiency due to the electrostatic adsorption effect existing on the surface.
(2) According to the invention, the cut hydrophobic polymer film is taken as a framework, the framework comprises a vertical rectangular channel and a plurality of triangles arranged on two sides of the vertical rectangular channel, the triangles on two sides are respectively in asymmetric arrangement, and the amphiphilic cellulose derivative modified by the hydrophobic group is taken as a coating to be coated on the surface of each triangle, so that electrostatic adsorption effect can be generated on fog drops, and extremely high water collection efficiency is provided for the fog drops.
(3) The preparation method of the invention is simple, has low production cost and is suitable for industrial mass production.
Drawings
Fig. 1 is a schematic structural view of an advanced cellulosic material for efficient mist collection of the present invention.
In the figure:
1: a hydrophobic polymer backbone structure; 101: a vertical rectangular channel; 102. triangle; 2: amphiphilic cellulose derivative coating.
Detailed Description
The invention is further illustrated in the following drawings and detailed description, which are not intended to limit the scope of the invention.
Example 1:
the advanced cellulose material for efficient water mist collection, and the preparation method and the application provided in the embodiment 1 comprise the following steps:
step 1: preparation of hydrophobic Polymer film skeleton
The hydrophobic polymer film is a polytetrafluoroethylene film, and the process for cutting the polytetrafluoroethylene film by adopting a laser cutting mode comprises the following steps: sequentially washing a polytetrafluoroethylene film with the thickness of 100 mu m by using acetone, deionized water and ethanol solution, cutting the polytetrafluoroethylene film into a framework structure by using a laser cutting machine at the laser power of 4%, the moving speed of 6% and cutting for 2 times, wherein the framework structure comprises a vertical rectangular channel, two sides of the vertical rectangular channel are respectively provided with a plurality of triangles, the triangles on the two sides are respectively staggered, and the height of each triangle is 10mm and the width of each triangle is 1mm; the included angle between the triangle and the vertical rectangular channel is 45 degrees; the vertical distance between the triangles on the same side is 3mm, and the vertical distance between the triangles on the opposite side is 10mm; the width of the vertical rectangular channel is 3mm.
Step 2: preparation of hydrophobic group modified amphiphilic cellulose derivatives
The preparation of the amphiphilic cellulose derivative modified by the hydrophobic group is realized by taking microcrystalline cellulose as a matrix, taking 10-undecylenoyl chloride as a compound containing a long-chain alkyl group, and adopting the 10-undecylenoyl chloride to carry out chemical modification on the long-chain alkyl group of the microcrystalline cellulose, wherein the chemical modification process comprises the following steps: 10-undecylenoyl chloride and microcrystalline cellulose are reacted and purified in a weight ratio of 1:2 for 2 hours at 50 ℃, and then dissolved in tetrahydrofuran solution for storage.
Step 3: preparation of advanced cellulosic materials for efficient mist collection
And (2) sucking 5 mu L of the hydrophobic group modified amphiphilic cellulose derivative solution with the concentration of 10mg/mL in the step (2) by using a pipette, and coating 5 times on each triangular surface of the hydrophobic polymer film skeleton prepared in the step (1) to obtain the advanced cellulose material. The loading capacity of the hydrophobic group modified amphiphilic cellulose derivative coating is 1-50 mg/cm 2 。
The application of the advanced cellulose material for efficient water mist collection prepared in the embodiment 1 in efficient water mist collection can lead the water collection efficiency of the advanced cellulose material prepared in the embodiment 1 to reach 67kg/h.m at a mist flow rate of 300mL/h 2 。
Example 2:
the advanced cellulose material for efficient water mist collection, and the preparation method and the application provided in the embodiment 2 comprise the following steps:
step 1: preparation of hydrophobic Polymer film skeleton
The hydrophobic polymer film is a polyvinylidene fluoride film, and the process for cutting the polyvinylidene fluoride film by adopting a laser cutting mode comprises the following steps: sequentially washing a polyvinylidene fluoride film with the thickness of 150 mu m by using acetone, deionized water and ethanol solution, cutting the polyvinylidene fluoride film into a framework structure by using a laser cutting machine at the laser power of 10%, the moving speed of 20% and cutting for 2 times, wherein the framework structure comprises a vertical rectangular channel, two sides of the vertical rectangular channel are respectively provided with a plurality of triangles, the triangles on the two sides are respectively staggered, and the height of each triangle is 20mm and the width of each triangle is 5mm; the included angle between the triangle and the vertical rectangular channel is 70 degrees; the vertical distance between the triangles on the same side is 5mm, and the vertical distance between the triangles on the opposite side is 5mm; the width of the vertical rectangular channel is 5mm.
Step 2: preparation of hydrophobic group modified amphiphilic cellulose derivatives
The preparation of the amphiphilic cellulose derivative modified by the hydrophobic group is realized by taking microcrystalline cellulose as a matrix, taking 10-undecylenoyl chloride as a compound containing a long-chain alkyl group, and adopting the 10-undecylenoyl chloride to carry out chemical modification on the long-chain alkyl group of the microcrystalline cellulose, wherein the chemical modification process comprises the following steps: 10-undecylenoyl chloride and microcrystalline cellulose are reacted and purified in a weight ratio of 1:2 to microcrystalline cellulose of 1:4 for 1 hour at 80 ℃ and then dissolved in tetrahydrofuran solution for storage.
Step 3: preparation of advanced cellulosic materials for efficient mist collection
And (3) sucking 10 mu L of the hydrophobic group modified amphiphilic cellulose derivative solution with the concentration of 30mg/mL in the step (2) by using a pipette, and coating 2 times on each triangular surface of the hydrophobic polymer film skeleton prepared in the step (I) to obtain the advanced cellulose material. The loading capacity of the hydrophobic group modified amphiphilic cellulose derivative coating is 1-50 mg/cm 2 。
The application of the advanced cellulose material for efficient water mist collection prepared in the embodiment 2 in efficient water mist collection can lead the water collection efficiency of the advanced cellulose material prepared in the embodiment 2 to reach 56kg/h.m under the mist flow rate of 300mL/h 2 。
Example 3:
the advanced cellulose material for efficient water mist collection, and the preparation method and the application provided in the embodiment 3 comprise the following steps:
step 1: preparation of hydrophobic Polymer film skeleton
The hydrophobic polymer film is a polyvinyl fluoride propylene film, and the process for cutting the polyvinyl fluoride propylene film by adopting a laser cutting mode comprises the following steps: after a 180-mu m polyvinyl fluoride propylene film is washed by acetone, deionized water and ethanol solution in sequence, a laser cutting machine is used for cutting the polyvinyl fluoride propylene film into a framework structure for 4 times at 15% of laser power and 45% of moving speed, and as shown in fig. 1, the framework structure comprises a vertical rectangular channel, two sides of the vertical rectangular channel are respectively provided with a plurality of triangles, the triangles on the two sides are respectively staggered, and the height of each triangle is 4mm and the width of each triangle is 0.7mm; the included angle between the triangle and the vertical rectangular channel is 100 degrees; the vertical distance between the triangles on the same side is 1mm, and the vertical distance between the triangles on the opposite side is 4mm; the width of the vertical rectangular channel is 1mm.
Step 2: preparation of hydrophobic group modified amphiphilic cellulose derivatives
The preparation of the amphiphilic cellulose derivative modified by the hydrophobic group is realized by taking microcrystalline cellulose as a matrix, taking 10-undecylenoyl chloride as a compound containing a long-chain alkyl group, and adopting the 10-undecylenoyl chloride to carry out chemical modification on the long-chain alkyl group of the microcrystalline cellulose, wherein the chemical modification process comprises the following steps: 10-undecylenoyl chloride and microcrystalline cellulose are reacted and purified in a weight ratio of 1:2 to microcrystalline cellulose of 1:5 for 5 hours at 30 ℃, and then dissolved in tetrahydrofuran solution for storage.
Step 3: preparation of advanced cellulosic materials for efficient mist collection
And (3) sucking 20 mu L of the hydrophobic group modified amphiphilic cellulose derivative solution with the concentration of 5mg/mL in the step (2) by using a pipette, and coating each triangular surface in the hydrophobic polymer film skeleton prepared in the step (I) for 5 times to obtain the advanced cellulose material. The loading capacity of the hydrophobic group modified amphiphilic cellulose derivative coating is 1-50 mg/cm 2 。
The application of the advanced cellulose material for efficient water mist collection prepared in the embodiment 3 in efficient water mist collection can lead the water collection efficiency of the advanced cellulose material prepared in the embodiment 3 to reach 45kg/h.m under the mist flow rate of 200mL/h 2 。
Example 4:
the advanced cellulose material for efficient water mist collection, and the preparation method and the application provided in the embodiment 1 comprise the following steps:
step 1: preparation of hydrophobic Polymer film skeleton
The hydrophobic polymer film is a polytrifluoroethylene film, and the process for cutting the polytrifluoroethylene film by adopting a laser cutting mode comprises the following steps: sequentially washing a polytrifluoroethylene film with the thickness of 200 mu m by using acetone, deionized water and ethanol solution, cutting a skeleton structure by using a laser cutting machine at the laser power of 20%, the moving speed of 50% and cutting for 1 time, wherein the skeleton structure comprises a vertical rectangular channel, two sides of the vertical rectangular channel are respectively provided with a plurality of triangles, the triangles on the two sides are respectively staggered, and the height of each triangle is 30mm and the width of each triangle is 3mm; the included angle between the triangle and the vertical rectangular channel is 60 degrees; the vertical distance between the triangles on the same side is 3mm, and the vertical distance between the triangles on the opposite side is 7mm; the width of the vertical rectangular channel is 3mm.
Step 2: preparation of hydrophobic group modified amphiphilic cellulose derivatives
The preparation of the amphiphilic cellulose derivative modified by the hydrophobic group is realized by taking microcrystalline cellulose as a matrix, taking 10-undecylenoyl chloride as a compound containing a long-chain alkyl group, and adopting the 10-undecylenoyl chloride to carry out chemical modification on the long-chain alkyl group of the microcrystalline cellulose, wherein the chemical modification process comprises the following steps: 10-undecylenoyl chloride and microcrystalline cellulose are reacted and purified in a weight ratio of 1:2 to microcrystalline cellulose of 1:1 for 4 hours at a temperature of 100 ℃, and then dissolved in tetrahydrofuran solution for storage.
Step 3: preparation of advanced cellulosic materials for efficient mist collection
And (3) sucking 15 mu L of the hydrophobic group modified amphiphilic cellulose derivative solution with the concentration of 25mg/mL in the step (2) by using a pipette, and coating 3 times on each triangular surface of the hydrophobic polymer film skeleton prepared in the step (I) to obtain the advanced cellulose material. The loading capacity of the hydrophobic group modified amphiphilic cellulose derivative coating is 1-50 mg/cm 2 。
The application of the advanced cellulose material for efficient water mist collection prepared in the embodiment 4 in efficient water mist collection can lead the water collection efficiency of the advanced cellulose material prepared in the embodiment 4 to reach 36kg/h.m under the mist flow rate of 200mL/h 2 。
The technical principle of the invention is as follows: the triangular framework structures asymmetrically distributed on two sides of the vertical rectangular channel provide Laplace pressure driving force for the liquid drops. The engineered, synthetic amphiphilic cellulose coating provides hydrophilic sites for efficient nucleation of droplets while reducing pinning of droplets. The smooth hydrophobic rectangular channel is favorable for quick refreshing of surface liquid drops, and liquid evaporation is effectively avoided. In addition, the electrostatic adsorption effect existing between the polymer film and the fog drops can effectively enhance the water collection efficiency, so that the extremely high water collection efficiency is realized.
Claims (7)
1. The advanced cellulose material for efficient water mist collection is characterized in that the advanced cellulose material takes a cut hydrophobic polymer film as a framework, the hydrophobic polymer film is a fluorine polymer film, the framework comprises a vertical rectangular channel, two sides of the vertical rectangular channel are respectively provided with a plurality of triangles, the triangles on the two sides are respectively in asymmetric arrangement, an included angle between the triangle and the vertical rectangular channel is 10-70 degrees, an amphiphilic cellulose derivative modified by a hydrophobic group is used as a coating to be coated on the surface of each triangle, the amphiphilic cellulose derivative modified by the hydrophobic group takes microcrystalline cellulose as a matrix, and long-chain alkane groups are chemically modified on the microcrystalline cellulose by adopting a compound containing long-chain alkane, and the chemical modification process comprises the following steps: the weight ratio of the long-chain alkyl group-containing compound to the microcrystalline cellulose is 1: 1-5, reacting for 0.5-8 h at 30-120 ℃, purifying, and storing in solution/suspension or dissolving in tetrahydrofuran solution, wherein the compound containing long-chain alkyl group is 10-undecylenoyl chloride.
2. The advanced cellulose material for efficient mist collection according to claim 1, wherein the thickness of the hydrophobic polymer film is 10-2000 μm, the height of the triangle is 1-50 mm, the width of the triangle is 0.3-20 mm, the width of the vertical rectangular channel is 0.5-20 mm, the vertical spacing between the same side triangles is 0-100 mm, and the vertical spacing between the opposite side triangles is 0-100 mm, respectively.
3. The advanced cellulose material for efficient mist collection of claim 1, wherein the fluoropolymer film is any one of polytetrafluoroethylene, polytrifluoroethylene, polyvinylidene fluoride, or polyvinyl fluoride propylene.
4. The advanced cellulose material for efficient water mist collection as recited in claim 1, wherein the hydrophobic group modified amphiphilic cellulose derivative coating has a loading of 1-50 mg/cm 2 。
5. The advanced cellulosic material for efficient mist collection of claim 1, wherein the coating application process is: and sucking 5-50 mu L of hydrophobic group modified amphiphilic cellulose derivative solution with the concentration of 5-40 mg/mL by using a pipette, and respectively coating each triangle surface for 1-5 times.
6. The advanced cellulose material for efficient mist collection according to claim 1, characterized in that the backbone preparation method comprises the steps of: and (3) after the hydrophobic polymer film is washed by acetone, deionized water and ethanol solution in sequence, cutting the hydrophobic polymer film into structures of triangular and vertical rectangular channels by a laser cutting machine at a laser power of 2% -40%, a moving speed of 5% -60% and cutting for 1-10 times.
7. Use of an advanced cellulosic material for efficient mist collection according to any of the claims 1 to 6 in efficient mist collection.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101693743A (en) * | 2009-10-28 | 2010-04-14 | 中国林业科学研究院林产化学工业研究所 | Process for preparing cellulose derivatives containing double-bond lateral group |
| CN111069001A (en) * | 2019-12-31 | 2020-04-28 | 上海大学 | Material with bionic hydrophobic-hydrophilic surface and preparation method and application thereof |
| CN112302100A (en) * | 2020-11-17 | 2021-02-02 | 厦门大学 | Multi-bionics fog water collecting structure and preparation method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101693743A (en) * | 2009-10-28 | 2010-04-14 | 中国林业科学研究院林产化学工业研究所 | Process for preparing cellulose derivatives containing double-bond lateral group |
| CN111069001A (en) * | 2019-12-31 | 2020-04-28 | 上海大学 | Material with bionic hydrophobic-hydrophilic surface and preparation method and application thereof |
| CN112302100A (en) * | 2020-11-17 | 2021-02-02 | 厦门大学 | Multi-bionics fog water collecting structure and preparation method thereof |
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