CN115010975A - Advanced cellulose material for efficient water mist collection and preparation method and application thereof - Google Patents
Advanced cellulose material for efficient water mist collection and preparation method and application thereof Download PDFInfo
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Abstract
The advanced cellulose material for efficient water mist collection, the preparation method and the application are characterized in that the advanced cellulose material takes a cut hydrophobic polymer film as a framework, the framework comprises a vertical rectangular channel, a plurality of triangles are arranged on two sides of the vertical rectangular channel respectively, the triangles on the two sides are arranged asymmetrically, and an amphiphilic cellulose derivative modified by a hydrophobic group is coated on the surface of each triangle. The invention imitates the biological characteristics of cactus palmaris and beetle coleoptera, and accelerates the convergence and the falling of fog drops by utilizing the double bionic principle. Compared with the traditional fog collection surface, the invention adopts cheap, green and renewable cellulose as the raw material of the amphiphilic coating, has simple preparation method, can further enhance the water collection efficiency by the electrostatic adsorption effect on the surface, and is suitable for popularization.
Description
Technical Field
The invention relates to the technical field of high-valued utilization of lignocellulose biomass, in particular to an advanced cellulose material for efficient water mist collection, and a preparation method and application thereof.
Background
With population growth and energy consumption on a global scale, the increasing shortage of water resources presents an unprecedented challenge to the scientific and engineering community. Atmospheric water is a ubiquitous environmental resource with the content of about 1.29x10 16 kg, corresponding to three times the total annual water usage worldwide. Developing a new technology for capturing atmospheric water as a clean water source receives more and more attention. Wherein, fog collection is taken as a typical air water capture scheme, and rapid field production can be realized. The way of collecting it is inspired by the original bioadaptive evolution to cope with the biological characteristics of the harsh environment. For example, cactus provides thorns with surface energy gradients and asymmetric curvatures, desert beetles provide coleoptera with hydrophilic and hydrophobic surface chemistry, and pitcher plants have smooth inner walls. Therefore, ingeniously mimicking these interesting biological features is an effective way to alleviate water shortages.
The process of mist collection mainly includes mist capture (droplet nucleation) and droplet transport (droplet removal). A single biomimetic based surface may be limited in some way during mist collection. For example, the hydrophilicity of the asymmetric spine surface can cause water film shielding, droplets localized on the super-hydrophilic/hydrophobic surface need to be larger than a critical size to fall off, and the hydrophobic lubricant on the smooth surface can hinder mist capture. Therefore, the method skillfully combines various bionic principles to design a synergistic droplet nucleation and removal mechanism, and is of great importance in realizing simplified large-scale preparation. In addition, electron transfer has been demonstrated to exist in the contact process of liquids with solids. Theoretically, mist on the collector surface or water droplets may also be affected by charge interactions during transport. However, few have effectively utilized 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 of the prior art and provide an advanced cellulose material for high-efficiency water mist collection, and the specific scheme is as follows:
the advanced cellulose material for efficient water mist collection takes a cut hydrophobic polymer film as a framework, the framework comprises a vertical rectangular channel, a plurality of triangles are arranged on two sides of the vertical rectangular channel respectively, the triangles on the two sides are arranged asymmetrically respectively, and an amphiphilic cellulose derivative modified by hydrophobic groups is coated on each triangular surface as a coating.
Furthermore, the thickness of the hydrophobic polymer film is 10-2000 micrometers, the height of each triangle is 1-50 mm, the width of each triangle is 0.3-20 mm, the included angle between each triangle and each vertical rectangular channel is 10-170 degrees, the width of each vertical rectangular channel is 0.5-20 mm, the vertical distance between each triangle on the same side is 0-100 mm, and the vertical distance between each triangle on the same side and the corresponding triangle on the opposite side is 0-100 mm.
Further, the hydrophobic polymer film is a fluorine-based polymer film, and the fluorine-based polymer film is any one of Polytetrafluoroethylene (PTFE), Polychlorotrifluoroethylene (PCTFE), polyvinylidene fluoride (PVDF), or polyvinyl fluoride propylene (FEP).
Furthermore, the loading amount of the amphiphilic cellulose derivative coating modified by the hydrophobic group is 1-50 mg/cm 2 。
Further, the compound containing a long-chain alkyl group is 10-undecylenecarboxylic acid chloride.
Further, the coating process comprises the following steps: sucking 5-50 μ L of an amphiphilic cellulose derivative solution with a concentration of 5-40 mg/mL by using a pipette, and coating each triangular surface 1-5 times.
The preparation method of the amphiphilic cellulose derivative modified by the hydrophobic group in the advanced cellulose material for efficient water mist collection comprises the following steps of taking microcrystalline cellulose as a matrix, and chemically modifying the microcrystalline cellulose by using a compound containing long-chain alkane to obtain the amphiphilic cellulose derivative modified by the hydrophobic group, wherein the chemical modification process comprises the following steps: the weight ratio of the compound containing long-chain alkyl groups to the microcrystalline cellulose is 1: 1-5, reacting for 0.5-8 h at 30-120 ℃, purifying, and storing in the form of solution/suspension or dissolving in tetrahydrofuran solution.
The application of the advanced cellulose material for high-efficiency water mist collection in high-efficiency water mist collection.
The preparation method of the skeleton in the advanced cellulose material for efficient water mist collection comprises the following steps: after the hydrophobic polymer film is washed clean by acetone, deionized water and ethanol solution in sequence, a laser cutting machine is used for cutting the structure of a triangular channel and a vertical rectangular channel 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, the plurality of triangles which are asymmetrically arranged are respectively arranged on the two sides of the vertical rectangular channel, and then the amphiphilic cellulose derivative modified by the hydrophobic groups is coated on the surface of each triangle, so that the efficiency and the stability of water mist collection are improved. Compared with the traditional fog collecting surface, the invention adopts cheap, green and renewable cellulose as the raw material of the amphiphilic coating, and the preparation method is simple, and the electrostatic adsorption effect on the surface of the invention can further enhance the water collecting efficiency.
(2) The invention takes the cut hydrophobic polymer film as a framework, the framework comprises a vertical rectangular channel and a plurality of triangles arranged at two sides of the vertical rectangular channel, the triangles at the two sides are respectively arranged asymmetrically, and the amphiphilic cellulose derivative modified by hydrophobic groups is taken as a coating and coated on the surface of each triangle to generate electrostatic adsorption effect on fog drops, thereby endowing the water collection efficiency to be extremely high.
(3) The preparation method is simple, low in production cost and suitable for industrial large-scale production.
Drawings
FIG. 1 is a schematic structural view of an advanced cellulose material for high efficiency water mist collection of the present invention.
In the figure:
1: a hydrophobic polymer backbone structure; 101: a vertical rectangular channel; 102. a triangle shape; 2: an amphiphilic cellulose derivative coating.
Detailed Description
The present invention is further explained below with reference to the drawings and the embodiments, and it should be noted that the embodiments are not intended to limit the scope of the present invention.
Example 1:
the advanced cellulose material for efficient water mist collection and the preparation method and application thereof provided by the embodiment 1 comprise the following steps:
step 1: preparation of hydrophobic Polymer film backbone
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: washing a polytetrafluoroethylene film with the thickness of 100 mu m by using acetone, deionized water and an ethanol solution in sequence, and cutting the polytetrafluoroethylene film into a framework structure by using a laser cutting machine for 2 times at the laser power of 4% and the moving speed of 6%, wherein the framework structure comprises a vertical rectangular channel, a plurality of triangles are respectively arranged on two sides of the vertical rectangular channel, the triangles on the two sides are respectively arranged in a staggered manner, the height of each triangle is 10mm, and the width of each triangle is 1 mm; 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 10 mm; the width of the vertical rectangular channel is 3 mm.
Step 2: preparation of amphiphilic cellulose derivatives modified with hydrophobic groups
The amphiphilic cellulose derivative modified by the hydrophobic group is prepared by taking microcrystalline cellulose as a matrix, taking a compound containing a long-chain alkyl group as 10-undecylenoyl chloride, and chemically modifying the microcrystalline cellulose by adopting the 10-undecylenoyl chloride to obtain a long-chain alkane group, wherein the chemical modification process comprises the following steps: 10-undecylenic chloride and microcrystalline cellulose are dissolved in tetrahydrofuran solution for storage after reaction and purification at the weight ratio of 1:2, the reaction time of 2 hours and the temperature of 50 ℃.
And 3, step 3: preparation of advanced cellulose Material for efficient Water mist Collection
And (3) 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 gun, and coating each triangular surface in the hydrophobic polymer film skeleton prepared in the step (1) for 5 times to obtain the advanced cellulose material. The loading amount of the amphiphilic cellulose derivative coating modified by the hydrophobic groups is 1-50 mg/cm 2 。
The advanced cellulose material prepared in example 1 for high-efficiency water mist collection can achieve the water collection efficiency of 67kg/h.m at the mist flow rate of 300mL/h 2 。
Example 2:
the advanced cellulose material for efficient water mist collection and the preparation method and application thereof provided by the embodiment 2 comprise the following steps:
step 1: preparation of hydrophobic Polymer film backbone
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: washing a 150-micrometer-thick polyvinylidene fluoride film with acetone, deionized water and an ethanol solution in sequence, and cutting the film for 2 times by using a laser cutting machine at the laser power of 10% and the moving speed of 20% to obtain a skeleton structure, wherein the skeleton structure comprises a vertical rectangular channel, a plurality of triangles are respectively arranged on two sides of the vertical rectangular channel, the triangles on the two sides are respectively arranged in a staggered manner, the height of each triangle is 20mm, and the width of each triangle is 5mm, as shown in fig. 1; 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 5 mm; the width of the vertical rectangular channel is 5 mm.
And 2, step: preparation of amphiphilic cellulose derivatives modified with hydrophobic groups
The amphiphilic cellulose derivative modified by the hydrophobic group is prepared by taking microcrystalline cellulose as a matrix, taking a compound containing a long-chain alkyl group as 10-undecylenoyl chloride, and chemically modifying the microcrystalline cellulose by adopting the 10-undecylenoyl chloride to obtain a long-chain alkane group, wherein the chemical modification process comprises the following steps: 10-undecylenoyl chloride and microcrystalline cellulose are reacted and purified according to the weight ratio of 1:2 and the weight ratio of 1:4 at the temperature of 80 ℃ for 1 hour, and then dissolved in tetrahydrofuran solution for storage.
And step 3: preparation of advanced cellulose Material for efficient Water 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 gun, and coating each triangular surface in the hydrophobic polymer film skeleton prepared in the step (one) for 2 times to obtain the advanced cellulose material. The loading amount of the amphiphilic cellulose derivative coating modified by the hydrophobic groups is 1-50 mg/cm 2 。
The advanced cellulose material prepared in the example 2 for high-efficiency water mist collection is applied to high-efficiency water mist collection, and the water collection efficiency of the advanced cellulose material prepared in the example 2 can reach 56kg/h.m at the mist flow rate of 300mL/h 2 。
Example 3:
the advanced cellulose material for efficient water mist collection and the preparation method and application thereof provided by the embodiment 3 comprise the following steps:
step 1: preparation of hydrophobic Polymer film backbone
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: washing a polyvinyl fluoride propylene film with the thickness of 180 mu m by using acetone, deionized water and an ethanol solution in sequence, and cutting the film for 4 times by using a laser cutting machine at the laser power of 15% and the moving speed of 45% to obtain a framework structure, wherein the framework structure comprises a vertical rectangular channel, a plurality of triangles are respectively arranged on two sides of the vertical rectangular channel, the triangles on the two sides are respectively arranged in a staggered manner, and each triangle is 4mm in height and 0.7mm in width; 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 4 mm; the width of the vertical rectangular channel is 1 mm.
Step 2: preparation of amphiphilic cellulose derivatives modified with hydrophobic groups
The amphiphilic cellulose derivative modified by the hydrophobic group is prepared by taking microcrystalline cellulose as a matrix, taking a compound containing a long-chain alkyl group as 10-undecylenoyl chloride, and chemically modifying the microcrystalline cellulose by adopting the 10-undecylenoyl chloride to obtain a long-chain alkane group, wherein the chemical modification process comprises the following steps: 10-undecylenoyl chloride and microcrystalline cellulose are reacted and purified according to the weight ratio of 1:2 and the weight ratio of 1:5, the reaction time is 5 hours, and the temperature is 30 ℃, and then the mixture is dissolved in tetrahydrofuran solution for storage.
And step 3: preparation of advanced cellulose Material for efficient Water 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 gun, and coating each triangular surface in the hydrophobic polymer film skeleton prepared in the step (one) for 5 times to obtain the advanced cellulose material. The loading amount of the amphiphilic cellulose derivative coating modified by the hydrophobic groups is 1-50 mg/cm 2 。
The advanced cellulose material prepared in example 3 for high-efficiency water mist collection can achieve the water collection efficiency of 45kg/h.m at the mist flow rate of 200mL/h 2 。
Example 4:
the advanced cellulose material for efficient water mist collection provided by the embodiment 1, and the preparation method and the application thereof comprise the following steps:
step 1: preparation of hydrophobic Polymer film backbone
The hydrophobic polymer film is a polychlorotrifluoroethylene film, and the process for cutting the polychlorotrifluoroethylene film by adopting a laser cutting mode comprises the following steps: after a polychlorotrifluoroethylene film with the thickness of 200 micrometers is washed clean by using acetone, deionized water and an ethanol solution in sequence, a laser cutting machine is used for cutting a framework structure for 1 time at the laser power of 20 percent and the moving speed of 50 percent, as shown in figure 1, the framework structure comprises a vertical rectangular channel, a plurality of triangles are respectively arranged on two sides of the vertical rectangular channel, the triangles on the two sides are respectively arranged in a staggered way, the height of each triangle is 30mm, and the width of each triangle is 3 mm; 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 7 mm; the width of the vertical rectangular channel is 3 mm.
Step 2: preparation of hydrophobic group-modified amphiphilic cellulose derivatives
The amphiphilic cellulose derivative modified by the hydrophobic group is prepared by taking microcrystalline cellulose as a matrix, taking a compound containing a long-chain alkyl group as 10-undecylenoyl chloride, and chemically modifying the microcrystalline cellulose by adopting the 10-undecylenoyl chloride to obtain a long-chain alkane group, wherein the chemical modification process comprises the following steps: 10-undecylenoyl chloride and microcrystalline cellulose are reacted and purified according to the weight ratio of 1:2 and the weight ratio of 1:1 at the temperature of 100 ℃ for 4 hours, and then dissolved in tetrahydrofuran solution for storage.
And step 3: preparation of advanced cellulose Material for efficient Water 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 gun, and coating each triangular surface in the hydrophobic polymer film skeleton prepared in the step (one) for 3 times to obtain the advanced cellulose material. The loading amount of the amphiphilic cellulose derivative coating modified by the hydrophobic groups is 1-50 mg/cm 2 。
The advanced cellulose material prepared in example 4 for high-efficiency water mist collection can achieve the water collection efficiency of 36kg/h.m at the mist flow rate of 200mL/h 2 。
The technical principle of the invention is as follows: the triangular framework structures which are asymmetrically distributed on two sides of the vertical rectangular channel provide Laplace pressure driving force for liquid drops. The synthetic amphiphilic cellulose coating is designed to provide effective nucleation of hydrophilic sites for the droplets while reducing droplet pinning. The smooth hydrophobic rectangular channel is beneficial to the quick refreshing of surface liquid drops, and the 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, thereby realizing extremely high water collection efficiency.
Claims (9)
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 framework comprises a vertical rectangular channel, a plurality of triangles are arranged on two sides of the vertical rectangular channel respectively, the triangles on the two sides are arranged asymmetrically respectively, and an amphiphilic cellulose derivative modified by hydrophobic groups is coated on each triangular surface as a coating.
2. The advanced cellulose material for efficient water mist collection as claimed in 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 included angle between the triangle and the vertical rectangular channel is 10-170 °, the width of the vertical rectangular channel is 0.5-20 mm, the vertical distance between the triangles on the same side is 0-100 mm, and the vertical distance between the triangles on the opposite side is 0-100 mm.
3. The advanced cellulose material for high efficiency water mist collection as claimed in claim 1, wherein the hydrophobic polymer film is a fluorine based polymer film, the fluorine based polymer film is any one of Polytetrafluoroethylene (PTFE), Polychlorotrifluoroethylene (PCTFE), polyvinylidene fluoride (PVDF) or polyvinyl fluoride propylene (FEP).
4. The advanced cellulose material for high efficiency water mist collection as claimed in claim 1, wherein the amphiphilic cellulose derivative modified with hydrophobic groupsThe load capacity of the biological coating is 1-50 mg/cm 2 。
5. The advanced cellulose material for high efficiency water mist collection as claimed in claim 1, wherein the compound containing long chain alkyl group is 10-undecenoyl chloride.
6. The advanced cellulose material for high efficiency water mist collection according to claim 1, wherein the coating is applied by a process comprising: absorbing 5-50 mu L of amphiphilic cellulose derivative solution modified by hydrophobic groups with the concentration of 5-40 mg/mL by using a liquid-transferring gun, and respectively coating 1-5 times on each triangular surface.
7. The preparation method of the amphiphilic cellulose derivative modified by the hydrophobic group in the advanced cellulose material for high-efficiency water mist collection, which is characterized in that the amphiphilic cellulose derivative modified by the hydrophobic group takes microcrystalline cellulose as a matrix and is obtained by chemically modifying microcrystalline cellulose by using a compound containing long-chain alkane, wherein the chemical modification process comprises the following steps: the weight ratio of the compound containing long-chain alkyl groups to the microcrystalline cellulose is 1: 1-5, reacting for 0.5-8 h at 30-120 ℃, purifying, and storing in a solution/suspension form or storing after dissolving in a tetrahydrofuran solution.
8. Use of the advanced cellulose material for high efficiency water mist collection according to any one of claims 1 to 7 in high efficiency water mist collection.
9. A method for preparing a skeleton in an advanced cellulose material for efficient water mist collection according to any one of claims 1 to 7, characterized by comprising the following steps: after the hydrophobic polymer film is washed clean by acetone, deionized water and ethanol solution in sequence, a laser cutting machine is used for cutting the structure of a triangular channel and a vertical rectangular channel for 1-10 times at the laser power of 2-40% and the moving speed of 5-60%.
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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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