CN114570114B - Rush air filtering material and preparation method thereof - Google Patents
Rush air filtering material and preparation method thereof Download PDFInfo
- Publication number
- CN114570114B CN114570114B CN202210346354.6A CN202210346354A CN114570114B CN 114570114 B CN114570114 B CN 114570114B CN 202210346354 A CN202210346354 A CN 202210346354A CN 114570114 B CN114570114 B CN 114570114B
- Authority
- CN
- China
- Prior art keywords
- rush
- bacterial cellulose
- culture medium
- air filter
- filter material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000000463 material Substances 0.000 title claims abstract description 87
- 238000001914 filtration Methods 0.000 title claims abstract description 69
- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- 229920002749 Bacterial cellulose Polymers 0.000 claims abstract description 74
- 239000005016 bacterial cellulose Substances 0.000 claims abstract description 74
- 239000000835 fiber Substances 0.000 claims abstract description 56
- 239000001963 growth medium Substances 0.000 claims abstract description 42
- 239000002131 composite material Substances 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 24
- 241000233866 Fungi Species 0.000 claims abstract description 15
- 230000008569 process Effects 0.000 claims abstract description 14
- 238000012258 culturing Methods 0.000 claims abstract description 12
- 238000009629 microbiological culture Methods 0.000 claims abstract description 11
- 230000004048 modification Effects 0.000 claims abstract description 10
- 238000012986 modification Methods 0.000 claims abstract description 10
- 244000005700 microbiome Species 0.000 claims abstract description 9
- 238000000465 moulding Methods 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims description 34
- 239000011148 porous material Substances 0.000 claims description 33
- 230000001580 bacterial effect Effects 0.000 claims description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 239000007864 aqueous solution Substances 0.000 claims description 12
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 12
- 239000000243 solution Substances 0.000 claims description 11
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 10
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 10
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 9
- UKLNMMHNWFDKNT-UHFFFAOYSA-M sodium chlorite Chemical compound [Na+].[O-]Cl=O UKLNMMHNWFDKNT-UHFFFAOYSA-M 0.000 claims description 9
- 229960002218 sodium chlorite Drugs 0.000 claims description 9
- 244000235858 Acetobacter xylinum Species 0.000 claims description 8
- 235000002837 Acetobacter xylinum Nutrition 0.000 claims description 8
- 239000008367 deionised water Substances 0.000 claims description 8
- 229910021641 deionized water Inorganic materials 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 8
- 239000002253 acid Substances 0.000 claims description 6
- 238000000643 oven drying Methods 0.000 claims description 5
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 claims description 4
- 239000001888 Peptone Substances 0.000 claims description 4
- 108010080698 Peptones Proteins 0.000 claims description 4
- 240000004808 Saccharomyces cerevisiae Species 0.000 claims description 4
- 238000009835 boiling Methods 0.000 claims description 4
- DGLRDKLJZLEJCY-UHFFFAOYSA-L disodium hydrogenphosphate dodecahydrate Chemical compound O.O.O.O.O.O.O.O.O.O.O.O.[Na+].[Na+].OP([O-])([O-])=O DGLRDKLJZLEJCY-UHFFFAOYSA-L 0.000 claims description 4
- 239000008103 glucose Substances 0.000 claims description 4
- 235000019319 peptone Nutrition 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 239000001965 potato dextrose agar Substances 0.000 claims description 3
- 239000000758 substrate Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 9
- 241000894006 Bacteria Species 0.000 description 21
- 239000000428 dust Substances 0.000 description 11
- 241000196324 Embryophyta Species 0.000 description 10
- 230000006872 improvement Effects 0.000 description 8
- 238000009826 distribution Methods 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 238000001878 scanning electron micrograph Methods 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000001954 sterilising effect Effects 0.000 description 3
- 238000004659 sterilization and disinfection Methods 0.000 description 3
- 239000003513 alkali Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002609 medium Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 230000000813 microbial effect Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 239000002121 nanofiber Substances 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
- B01D39/18—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being cellulose or derivatives thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/04—Additives and treatments of the filtering material
- B01D2239/0414—Surface modifiers, e.g. comprising ion exchange groups
- B01D2239/0421—Rendering the filter material hydrophilic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/10—Filtering material manufacturing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
Abstract
The invention provides a rush air filtering material and a preparation method thereof. The rush air filter material comprises rush with bacterial cellulose fibers grown on the surface and inside. The preparation method comprises the following steps: carrying out hydrophilic modification treatment on rush; placing at least one piece of rush subjected to hydrophilic treatment in a microbial culture medium for culturing so that the surface and the interior of the rush are filled with bacterial cellulose fibers, and then taking out to obtain a bacterial cellulose/rush composite material; the rush air filtering material is obtained by a molding process of a plurality of bacterial cellulose/rush composite materials; or preparing a plurality of rush roots into a filtering base material through a molding process, then placing the filtering base material in a microorganism culture medium for culture so that the surfaces and the interiors of the rush roots are filled with bacterial cellulose fibers, and then taking out the rush roots to obtain the rush air filtering material. The invention utilizes the fungus to grow in rush with special net structure inside to obtain the air filtering material with excellent filtering effect.
Description
Technical Field
The invention relates to the technical field of air filters, in particular to a rush air filtering material and a preparation method thereof.
Background
With the continuous development of industrialization, environmental pollution for people to live is becoming serious. There are an increasing number of contaminating particles in the air that are threatening to human health, especially PM2.5. To accommodate the current living environment, various air filtration materials are produced sequentially.
Generally, air filter materials are largely classified into porous membrane filter materials and fiber-based filter materials.
The small pore size of the porous membrane filter material makes it have excellent filtration efficiency, however, the pressure drop of the material is high, the dust holding capacity is low, and the material cannot be widely applied. The preparation process of the fiber filter material is simple, and the pore size of the material is controllable, so that the fiber filter material becomes the most main filter material at present.
Fibrous filter materials are typically prepared using melt blown electret fibers, common nonwoven fibers, ultra fine glass fibers, electrospun nanofibers, and the like. However, most of the raw materials of these filters are petroleum-based derivatives which are not degradable, and their disposal becomes a new pollution burden for the ecological system.
In recent years, researchers have begun focusing their eyes on plant fibers. The plant fiber is soft, has abundant active groups on the surface, is biodegradable and has low cost, and becomes an ideal raw material for constructing the functional cellulose-based air filter material of the new generation.
The rush as a plant fiber has a natural porous structure and is an ideal material for manufacturing green filter materials. However, rush has an internal pore diameter of about 100. Mu.m, and PM2.5 particles (2.5 μm or less) cannot be effectively intercepted by direct use, and the rush needs to be modified to reduce the internal pore diameter. It is difficult to reduce the size of the pores of 100 μm without damaging the pore structure. Therefore, how to reduce the pore diameter of the rush under the premise of not damaging the pore channel structure of the rush, and obtain a filtering material with high filtering performance is a problem to be solved urgently.
In view of the foregoing, there is a need for an improved rush air filter material and method of making the same that addresses the above-described problems.
Disclosure of Invention
The invention aims to provide a rush air filtering material and a preparation method thereof, wherein a special network structure in rush is utilized to enable micron-sized bacterial cellulose fibers to grow into rush pore channels, a composite net with a special structure is formed by interweaving plant brackets and bacterial cellulose fibers, and the prepared air filtering material is excellent in filtering effect.
In order to achieve the aim of the invention, the invention provides a rush air filtering material, which comprises rush with bacterial cellulose fibers growing on the surface and the inside.
As a further improvement of the invention, the mass content of the bacterial cellulose fiber is 0.5% -10% of that of the rush.
As a further improvement of the invention, the original pore diameter of the rush is 95-105 mu m, the diameter of the bacterial cellulose fiber is 0.1-1 mu m, and the pore diameter of the rush air filter material is 0.1-1.5 mu m.
The invention also provides a preparation method of the rush air filter material, which comprises the following steps:
s1, carrying out hydrophilic modification treatment on rush;
s2, preparing a microorganism culture medium, placing at least one rush subjected to hydrophilic treatment in the step S1 into the microorganism culture medium for culturing so that the surfaces and the interiors of the rush are filled with bacterial cellulose fibers, and then taking out to obtain a bacterial cellulose/rush composite material; the rush air filtering material is obtained by a forming process of a plurality of bacterial cellulose/rush composite materials;
or preparing a plurality of rush to a filter substrate by a molding process, then placing the rush in the microbial culture medium for culture so that the surface and the interior of the rush are filled with bacterial cellulose fibers, and then taking out to obtain the rush air filter material.
As a further improvement of the present invention, the method for preparing rush air filter material according to claim 4 is characterized by: in the step S2, the microbial culture medium comprises a culture medium and original bacterial liquid, the contents of the culture medium and the original bacterial liquid are adjusted according to the quantity of the rush, and each rush corresponds to 8-12mL of the culture medium and 2-4mL of the original bacterial liquid.
As a further improvement of the present invention, in step S2, the specific manner of culturing the rush in the microbial medium is: culturing in dark at 50-70deg.C for 8-12 days to make the surface and interior of medulla Junci full of bacterial cellulose fiber, washing with deionized water at 35-45deg.C, and oven drying at 45-55deg.C.
As a further improvement of the present invention, the original bacterial liquid includes one or more of white rot fungi bacterial liquid or acetobacter xylinum bacterial liquid.
As a further improvement of the invention, the white rot fungus liquid corresponds to the culture medium of 0.15-0.35g potato dextrose broth and 80-120mL water; the culture medium corresponding to the acetobacter xylinum bacterial liquid is 0.6-0.7g of disodium hydrogen phosphate dodecahydrate, 0.4-0.6g of yeast powder, 0.4-0.6g of peptone, 0.1-0.2g of citric acid, 1-3g of glucose and 80-120mL of water.
As a further improvement of the present invention, in step S2, the molding process specifically includes: and arranging a plurality of bacterial cellulose/rush composite materials in the same direction, tightly extruding, and binding the bacterial cellulose/rush composite materials on the surface by using gauze.
As a further improvement of the present invention, in step S1, the specific manner of performing the hydrophilic modification treatment on rush is as follows: placing medulla Junci in 90-100deg.C pre-prepared aqueous solution of sodium dodecyl benzene sulfonate or acid solution of sodium chlorite, boiling for 2-3 hr, washing with deionized water, and oven drying at 40-60deg.C; the concentration of the sodium dodecyl benzene sulfonate aqueous solution is (3-5) mg/L; the preparation method of the sodium chlorite acid solution comprises the step of adjusting the pH value of an aqueous solution of sodium chlorite with the concentration of 1-3wt% to 4-5 by acetic acid.
The beneficial effects of the invention are as follows:
(1) According to the invention, the rush is subjected to hydrophilic modification treatment, and the rush subjected to hydrophilic modification is placed in a microbial culture medium for culture, so that a large number of bacterial cellulose fibers are uniformly attached to the surface and the interior of the rush to obtain a bacterial cellulose/rush composite material, and then a plurality of bacterial cellulose/rush composite materials are subjected to a forming process to obtain the rush air filter material with good filter effect. By utilizing the special net structure and biological affinity in the rush, bacteria or fungi are attached on the surface of the rush, the connecting lines between the inner layers and the triangular side lines in each layer in a large quantity and grow along all directions, bacterial cellulose fibers are filled between each layer of net and different nets, the bacterial cellulose fibers in all directions are mutually wound, the bacterial cellulose fibers are filled in the rush, and a composite net with a special structure is formed by interweaving plant brackets and the bacterial cellulose fibers, so that the prepared air filtering material has excellent filtering effect. The connecting line between layers in the rush structure and the triangular edge line in each layer can provide attachment points for bacteria or fungi, so that the bacteria or fungi grow in a large quantity and are filled in the rush, the rush structure is prevented from deforming to a certain extent, and the prepared air filtering material has certain compression resistance.
(2) According to the invention, under the condition that the original structure of the rush is not damaged, the micro-scale pore canal in the rush is improved through the growth of microscopic bacteria, so that bacterial cellulose fibers are filled on the surface and in the rush, the pores with the original pore diameter of 100 microns are improved to pores with the pore diameter of 0.1-1.5 microns, and the pores are uniform, so that PM2.5 can be effectively intercepted. In addition, the natural fiber rush is used as a filter element, so that the filter element is environment-friendly and can be naturally degraded.
Drawings
FIG. 1 is a scanning electron microscope image of rush of the present invention, with a scale of 10 μm.
FIG. 2 is a scanning electron micrograph of rush obtained by petri dish culture in example 1, on a scale of 200. Mu.m.
FIG. 3 is a scanning electron micrograph of rush obtained by petri dish culture in example 1, on a scale of 50. Mu.m.
FIG. 4 is a scanning electron micrograph of rush obtained by petri dish culture in example 1, scale 5. Mu.m.
FIG. 5 is a scanning electron micrograph of the alkali-treated rush of comparative example 1, on a scale of 50. Mu.m.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
It should be noted that, in order to avoid obscuring the present invention due to unnecessary details, only structures and/or processing steps closely related to aspects of the present invention are shown in the drawings, and other details not greatly related to the present invention are omitted.
In addition, it should be further noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention provides a rush air filtering material, which comprises rush with bacterial cellulose fibers growing on the surface and the inside. Wherein the mass content of the bacterial cellulose fiber is 0.5-10% of that of the rush, the original pore diameter of the rush is 95-105 mu m, the diameter of the bacterial cellulose fiber is 0.1-1 mu m, and the pore diameter of the rush air filtering material is 0.1-1.5 mu m.
The invention also provides a preparation method of the rush air filter material, which comprises the following steps:
s1, carrying out hydrophilic modification treatment on rush:
placing medulla Junci in 90-100deg.C aqueous solution of sodium dodecyl benzene sulfonate or sodium chlorite acid solution, boiling for 2-3 hr, washing with deionized water for several times, and drying at 40-60deg.C to obtain hydrophilic medulla Junci.
Specifically, the concentration of the aqueous solution of sodium dodecylbenzenesulfonate is (3-5) mg/L, preferably 4mg/L. The configuration method comprises the following steps: adding 4mg of sodium dodecyl benzene sulfonate into 1L of water, and uniformly stirring.
The preparation method of the acid solution of sodium chlorite comprises the following steps: the aqueous solution of sodium chlorite with a concentration of 1-3wt% is adjusted to a pH of 4-5, preferably 4.6, with acetic acid.
The rush is a hydrophobic substance, and the rush is placed in a microbial culture medium containing a culture medium and an original bacterial liquid, and the rush cannot be infiltrated by the liquid in the culture medium, so that bacteria or fungi cannot grow in the culture medium and on the surface of the culture medium, and therefore, the culture medium is subjected to hydrophilic treatment.
S2, preparing a rush air filtering material:
preparing a microorganism culture medium, placing at least one rush subjected to the hydrophilic treatment in the step S1 into the microorganism culture medium for culturing so that the surfaces and the interiors of the rush are filled with bacterial cellulose fibers, and then taking out to obtain a bacterial cellulose/rush composite material; the rush air filter material is obtained by molding a plurality of bacterial cellulose/rush composite materials.
The method comprises the following steps: and (3) placing at least one hydrophilic rush prepared in the step (S1) in a microbial culture medium containing a culture medium and an original bacterial liquid in a sterile environment, and culturing in a dark place for 8-12 days at 50-70 ℃ to isolate other strains in the external environment, so that the surface and the interior of the rush are filled with bacterial cellulose fibers, and thus the bacterial cellulose/rush composite material is obtained. Taking out, washing in deionized water at 35-45deg.C for several times, removing water-soluble culture medium adhered on the surface of bacterial cellulose/medulla Junci composite material, and oven drying at 45-55deg.C.
Multiple rush pieces can be placed in one large culture dish at the same time, or multiple rush pieces can be placed in different small culture dishes at the same time for culture. The content of the culture medium and the original bacterial liquid in the microbial culture medium is freely adjusted according to the quantity of the rush, and each hydrophilic rush needs 8-12mL of the culture medium and 2-4mL of the original bacterial liquid.
When operating in a sterile environment, various operating equipment adopts steam sterilization treatment at 120-130 ℃ for 1-3h, preferably steam sterilization treatment at 121 ℃ for 2h.
Specifically, the original bacterial liquid comprises one or more of white rot fungi bacterial liquid or acetobacter xylinum bacterial liquid. Wherein, the culture medium corresponding to the white rot fungus liquid is 0.15-0.35g potato dextrose broth and 80-120mL water; the culture medium corresponding to the acetobacter xylinum bacterial liquid is 0.6-0.7g of disodium hydrogen phosphate dodecahydrate, 0.4-0.6g of yeast powder, 0.4-0.6g of peptone, 0.1-0.2g of citric acid, 1-3g of glucose and 80-120mL of water.
The specific mode of the molding process is as follows: and (3) arranging the obtained bacterial cellulose/rush composite materials in the same direction, tightly extruding, and binding the bacterial cellulose/rush composite materials on the surface by using gauze to obtain the rush air filtering material.
Preferably, the obtained plurality of rush filter elements are arranged in the same direction to form a cylinder, and are tightly squeezed and then bound on the surface by gauze to obtain the cylindrical rush air filter material.
In some embodiments, several pieces of rush are first formed into a filter substrate by a forming process, then placed in a microbial medium for cultivation, so that the surface and the interior of the rush are filled with bacterial cellulose fibers, and then removed to obtain the rush air filter material. The method for simultaneously culturing a plurality of rush has higher requirements on aseptic operation and the size of a culture dish and has relatively lower success rate.
The invention is described in detail below by means of several examples:
example 1
A preparation method of rush air filter material comprises the following steps:
s1, carrying out hydrophilic modification treatment on rush:
and (3) placing rush into an aqueous solution of sodium dodecyl benzene sulfonate at 100 ℃, boiling for 2 hours, washing with deionized water for several times, and drying at 50 ℃ to obtain the hydrophilic rush.
Specifically, the concentration of the sodium dodecyl benzene sulfonate aqueous solution is 4mg/L, and the preparation method comprises the following steps: adding 4mg of sodium dodecyl benzene sulfonate into 1L of water, and uniformly stirring.
As can be seen from fig. 1, the internal structure scanning electron microscope of rush (original rush) shown in fig. 1 has uniform pores, and the pores are arranged in order, specifically: the rush is internally provided with a plurality of layers of nets which are orderly arranged; each layer of net is uniformly provided with a plurality of triangular holes which are connected with each other and have basically the same size; each layer of net is connected with each other through each vertex of the triangle corresponding up and down, and finally a multi-layer net structure with ordered arrangement is formed. The connecting lines between the layers in the structure and the side lines of the triangles in each layer can provide habitat for bacteria or fungi, so that the structure is beneficial to mass growth of the bacteria or fungi; and the deformation of rush is avoided to a certain extent.
S2, preparing a rush air filtering material:
and (3) respectively placing a plurality of groups of hydrophilic rush prepared in the step S1 into a plurality of groups of microorganism culture mediums containing 10mL of culture mediums and 3mL of acetobacter xylinum bacteria liquid in a sterile environment, culturing in a dark place at 60 ℃ for 10 days (isolating other bacteria in the external environment), filling bacterial cellulose fibers on the surface and the interior of each rush, taking out the rush, placing the rush in deionized water at 40 ℃ for washing for a plurality of times, removing the water-soluble culture mediums adhered to the surface of the rush, and drying at 50 ℃ to obtain the bacterial cellulose/rush composite material. And (3) arranging the obtained bacterial cellulose/rush composite materials in the same direction to form a cylinder, tightly extruding, and binding the cylindrical rush air filtering material on the surface by using gauze.
When operating in a sterile environment, various operating equipment adopts steam sterilization treatment for 2 hours at 121 ℃.
Specifically, the culture medium corresponding to the acetobacter xylinum bacterial liquid is 0.68g of disodium hydrogen phosphate dodecahydrate, 0.5g of yeast powder, 0.5g of peptone, 0.15g of citric acid, 2g of glucose and 100mL of water.
As can be seen from fig. 2 and 3, the cells on the surface and inside of the rush, which are obtained by culture in a petri dish as shown in fig. 2 and 3, are filled with bacterial cellulose fibers, and the structure of the rush itself is not destroyed. After the rush is placed in the culture medium, bacteria are easily attached to the surface of the rush, connecting lines among layers and the side lines of the triangle in each layer, and the bacteria start to grow in all directions in the presence of the nutrient solution, so that bacterial cellulose fibers are filled between each layer of net and different nets.
As shown in fig. 4, bacterial cellulose fibers are intertwined to form a filter screen with smaller pore diameters.
Examples 2 to 3
The difference between the preparation method of rush air filter material and the embodiment 1 is that the cultivation temperature and cultivation time of bacteria in the step S2 are different, and the other steps are substantially the same as those in the embodiment 1, and are not described herein.
The rush air filter materials prepared in examples 1-3 were subjected to a filtration performance test, and the results are shown in Table 1. Wherein, the filtering efficiency refers to the filtering efficiency of the air filtering material on PM2.5 in the air; the original rush is not placed in a culture dish for culture, the rush with the same quantity is arranged in the same direction to be cylindrical, and the rush is tightly extruded and then bound on the surface by gauze to obtain the air filtering material.
TABLE 1 filtration Performance of rush air Filter materials prepared in examples 1-3
From table 1, it can be seen that the bacterial cellulose distribution can significantly increase the filtering efficiency of rush for PM2.5. The filtering efficiency of the air filtering material prepared from the original rush herb on PM2.5 is only 53.74 percent, and the dust holding capacity is 0.24g/cm 3 . The filtration resistance of the original rush is at a lower level than in examples 1-3, indicating that the air flow resistance through its interior is small and its own porous structure does not act as an ideal barrier to PM2.5. Bacteria are distributed on the surface of rush, connecting lines among inner layers and triangular side lines in each layer, bacteria grow bacterial cellulose in all directions, bacterial cellulose fibers in all directions are intertwined, and a composite net with a special structure is formed by interweaving plant brackets and the bacterial cellulose fibers, so that the air filtering performance of the composite net can be effectively improved. Example 1 exhibited an optimum filtration efficiency of 99.43% and 0.68g/cm 3 Is the maximum dust holding capacity of the dust collector. Correspondingly, the filtration resistance (136.82 Pa) is greater.
In the preparation method, the adjustment of the culture temperature and culture time of bacteria has a certain influence on the filtering performance of the material. As shown in the results of example 2, the bacterial cultivation time was shortened, the bacteria did not sufficiently grow, bacterial cellulose fibers grown in all directions could not be well entangled, so that the interweaving density of bacterial cellulose in rush was reduced, the resulting composite net structure of plant scaffolds and bacterial cellulose fibers interweaved with each other was poor, the pore size of the formed material was increased, and the interception effect of PM2.5 was reduced, and therefore, the corresponding filtration efficiency, filtration resistance and dust holding amount were all reduced. Likewise, the temperature at which bacteria are cultured is an important factor in the formation of the filter material. As shown in the results of example 3, the cultivation temperature of bacteria was lowered, resulting in a decrease in the filtration efficiency, filtration resistance and dust holding capacity of the material. The method is characterized in that the growth speed of bacteria can be changed by adjusting the culture temperature, so that the distribution density of bacterial cellulose is influenced, and a composite net structure formed by a plant bracket and bacterial cellulose fibers is further influenced. This demonstrates that a comfortable and stable ambient temperature results in an efficient growth of bacteria, thus achieving an optimal distribution of bacterial cellulose inside the rush.
Examples 4 to 5
The difference between the preparation method of rush air filter material and the embodiment 1 is that in the step S2, the content of the culture medium and the original bacterial liquid in the microbial culture dish is different, and the other steps are substantially the same as the embodiment 1, and are not described herein.
The rush air filter materials prepared in examples 4-5 were subjected to a filtration performance test, and the results are shown in Table 2. Wherein, the filtering efficiency refers to the filtering efficiency of the air filtering material on PM2.5 in the air; the original rush is not placed in a culture dish for culture, the rush with the same quantity is arranged in the same direction to be cylindrical, and the rush is tightly extruded and then bound on the surface by gauze to obtain the air filtering material.
Table 2 filtering properties of rush air filter materials prepared in examples 4-5
As is clear from Table 2, the content of the bacterial liquid in the cultivation process directly affects the filtration efficiency, filtration resistance and dust holding capacity of the air filter material. The results of examples 4-5 show that increasing the bacterial fluid content within a reasonable range can further increase the filtration efficiency and filtration resistance of the material, and vice versa. The method is characterized in that the growth density of bacterial liquid in unit volume is increased rapidly due to the increase of the bacterial liquid concentration, bacterial cellulose is distributed more densely, bacterial cellulose fibers growing in all directions form a special winding mode to obtain a composite net with a special structure, the reconstruction pores in rush are further reduced, the interception effect of PM2.5 is enhanced, and the reflected phenomenon is the increase of filtering efficiency and resistance.
However, as is clear from the results of example 5, the increase in the bacterial liquid content reduced the dust holding capacity of the filter material. In the initial stage of air filtration, PM2.5 particles are rapidly intercepted due to the excessively small pores formed in the material, a filter cake layer is rapidly formed on the surface of the net structure, and after the pores are gradually blocked, the resistance of the material is rapidly increased. Although the filtering efficiency of the material can be improved to a certain extent, the time for reaching the filtering saturation point is shortened, and therefore the dust holding capacity is reduced. The bacterial liquid content is regulated so as to obtain the reasonable distribution density of bacterial cellulose, and further, a better composite net structure of the interweaved plant bracket and bacterial cellulose fibers is obtained, which is a key factor for successfully preparing the air filtering material.
Example 6
The difference between the preparation method of rush air filter material and the embodiment 1 is that white rot fungi are selected in the step S2, and the other materials are substantially the same as the embodiment 1, and are not described herein. The filtration efficiency is 99.35%, the filtration resistance is 123.46Pa, and the dust holding capacity is 0.62g/cm 3 The method has no too strict requirement on the strain, and the application range of the method is wider.
Comparative example 1
A preparation method of medulla Junci air filter material comprises soaking medulla Junci in 8% sodium hydroxide aqueous solution for 45 min, destroying its special pore structure, drying at 60deg.C, culturing in microorganism culture medium, tightly squeezing the medulla Junci bacterial cellulose/medulla Junci composite material with bacterial cellulose fiber, binding with gauze on the surface to obtain cylindrical medulla Junci air filter material with a filtration efficiency of 92.42%,the filtration resistance was 80.85Pa, and the dust holding capacity was 0.39g/cm 3 The filtration effect was significantly reduced compared to comparative example 1. This is mainly because, as shown in fig. 5, the pore structure of the medulla Junci treated with the alkali solution changes, and the inside of the medulla Junci is shrunken, so that the originally orderly and full pore structure is destroyed, the pores become disordered, and the filter screen structure formed by the bacterial cellulose fibers and the medulla Junci is different due to the difference of the pore structures, so that the filtering effect is poor.
In summary, the invention provides a rush air filter material and a preparation method thereof, which utilize a special network structure in rush to enable bacteria or fungi to attach on the surface of rush, connecting lines among inner layers and triangular border lines in each layer in a large amount and grow along all directions, so that bacterial cellulose fibers are filled between each layer of net and different nets, and the bacterial cellulose fibers in all directions are mutually wound, thereby filling the bacterial cellulose fibers in the rush, generating a composite net with a special structure of mutually interweaving plant brackets and the bacterial cellulose fibers, and having excellent filter effect; the natural fiber rush is environment-friendly and can be naturally degraded.
The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention.
Claims (7)
1. A rush air filter material characterized by: comprises rush with bacterial cellulose fiber growing on the surface and inside; the mass content of the bacterial cellulose fiber is 0.5% -10% of that of the rush; the original pore diameter of the rush is 95-105 mu m, the diameter of the bacterial cellulose fiber is 0.1-1 mu m, and the pore diameter of the rush air filtering material is 0.1-1.5 mu m;
the preparation method of the rush air filter material comprises the following steps:
s1, carrying out hydrophilic modification treatment on rush;
s2, preparing a microorganism culture medium, placing at least one rush subjected to hydrophilic treatment in the step S1 into the microorganism culture medium for culturing so that the surfaces and the interiors of the rush are filled with bacterial cellulose fibers, and then taking out to obtain a bacterial cellulose/rush composite material; the rush air filtering material is obtained by a forming process of a plurality of bacterial cellulose/rush composite materials;
or preparing a plurality of rush to a filter substrate by a molding process, then placing the rush in the microbial culture medium for culture so that the surface and the interior of the rush are filled with bacterial cellulose fibers, and then taking out to obtain the rush air filter material.
2. A rush air filter material according to claim 1 wherein: in the step S2, the microbial culture medium comprises a culture medium and original bacterial liquid, the contents of the culture medium and the original bacterial liquid are adjusted according to the quantity of the rush, and each rush corresponds to 8-12mL of the culture medium and 2-4mL of the original bacterial liquid.
3. A rush air filter material according to claim 1 wherein: in step S2, the specific way of culturing the rush in the microbial culture medium is as follows: culturing in dark at 50-70deg.C for 8-12 days to make the surface and interior of medulla Junci full of bacterial cellulose fiber, washing with deionized water at 35-45deg.C, and oven drying at 45-55deg.C.
4. The rush air filter material of claim 2 wherein: the original bacterial liquid comprises one or more of white rot fungi bacterial liquid and acetobacter xylinum bacterial liquid.
5. The rush air filter material of claim 4 wherein: the culture medium corresponding to the white rot fungus liquid is 0.15-0.35g potato dextrose broth and 80-120mL water; the culture medium corresponding to the acetobacter xylinum bacterial liquid is 0.6-0.7g of disodium hydrogen phosphate dodecahydrate, 0.4-0.6g of yeast powder, 0.4-0.6g of peptone, 0.1-0.2g of citric acid, 1-3g of glucose and 80-120mL of water.
6. A rush air filter material according to claim 1 wherein: in step S2, the specific mode of the molding process is as follows: and arranging a plurality of bacterial cellulose/rush composite materials in the same direction, tightly extruding, and binding the bacterial cellulose/rush composite materials on the surface by using gauze.
7. A rush air filter material according to claim 1 wherein: in step S1, the specific way of performing hydrophilic modification treatment on rush is as follows: placing medulla Junci in 90-100deg.C pre-prepared aqueous solution of sodium dodecyl benzene sulfonate or acid solution of sodium chlorite, boiling for 2-3 hr, washing with deionized water, and oven drying at 40-60deg.C; the concentration of the sodium dodecyl benzene sulfonate aqueous solution is (3-5) mg/L; the preparation method of the sodium chlorite acid solution comprises the step of adjusting the pH value of an aqueous solution of sodium chlorite with the concentration of 1-3wt% to 4-5 by acetic acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210346354.6A CN114570114B (en) | 2022-04-02 | 2022-04-02 | Rush air filtering material and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210346354.6A CN114570114B (en) | 2022-04-02 | 2022-04-02 | Rush air filtering material and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114570114A CN114570114A (en) | 2022-06-03 |
| CN114570114B true CN114570114B (en) | 2024-02-27 |
Family
ID=81785304
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210346354.6A Active CN114570114B (en) | 2022-04-02 | 2022-04-02 | Rush air filtering material and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114570114B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5616479B1 (en) * | 2013-04-19 | 2014-10-29 | 大江生醫股▲ふん▼有限公司ＴＣＩＣｏ．Ｌｔｄ | Method for producing biocellulose membrane |
| WO2017002777A1 (en) * | 2015-06-30 | 2017-01-05 | 国立大学法人九州大学 | Modified nonwoven fabric for air filtration, air filtration device configured therefrom, and method for manufacturing modified nonwoven fabric |
| CN107486033A (en) * | 2017-08-01 | 2017-12-19 | 东华大学 | A kind of air filtration bacteria cellulose nano-fiber composite film and preparation method thereof |
| CN107847834A (en) * | 2015-08-03 | 2018-03-27 | 北越纪州制纸株式会社 | The manufacture method of air cleaner filtering material |
| CN107938370A (en) * | 2017-11-07 | 2018-04-20 | 东华大学 | Bacteria cellulose film composite material with nanometer spider web structure and preparation method thereof |
| CN110201996A (en) * | 2019-06-05 | 2019-09-06 | 上海大学 | A kind of rush combines the method for reparation pyrene and nickel combined contamination soil with Promoting bacteria |
| CN112624781A (en) * | 2020-11-23 | 2021-04-09 | 南京林业大学 | Composite material based on lignocellulose and bacterial cellulose and preparation method and application thereof |
-
2022
- 2022-04-02 CN CN202210346354.6A patent/CN114570114B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5616479B1 (en) * | 2013-04-19 | 2014-10-29 | 大江生醫股▲ふん▼有限公司ＴＣＩＣｏ．Ｌｔｄ | Method for producing biocellulose membrane |
| WO2017002777A1 (en) * | 2015-06-30 | 2017-01-05 | 国立大学法人九州大学 | Modified nonwoven fabric for air filtration, air filtration device configured therefrom, and method for manufacturing modified nonwoven fabric |
| CN107847834A (en) * | 2015-08-03 | 2018-03-27 | 北越纪州制纸株式会社 | The manufacture method of air cleaner filtering material |
| CN107486033A (en) * | 2017-08-01 | 2017-12-19 | 东华大学 | A kind of air filtration bacteria cellulose nano-fiber composite film and preparation method thereof |
| CN107938370A (en) * | 2017-11-07 | 2018-04-20 | 东华大学 | Bacteria cellulose film composite material with nanometer spider web structure and preparation method thereof |
| CN110201996A (en) * | 2019-06-05 | 2019-09-06 | 上海大学 | A kind of rush combines the method for reparation pyrene and nickel combined contamination soil with Promoting bacteria |
| CN112624781A (en) * | 2020-11-23 | 2021-04-09 | 南京林业大学 | Composite material based on lignocellulose and bacterial cellulose and preparation method and application thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114570114A (en) | 2022-06-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Tang et al. | The influence of fermentation conditions and post-treatment methods on porosity of bacterial cellulose membrane | |
| CN103691005B (en) | A kind of micro--Na fibrous tissue engineering rack and preparation method thereof | |
| Hirayama et al. | Cellular building unit integrated with microstrand-shaped bacterial cellulose | |
| Al-Shamary et al. | Influence of fermentation condition and alkali treatment on the porosity and thickness of bacterial cellulose membranes | |
| CN104963094A (en) | Non-woven cloth prepared by composite fibers by means of bacterial cellulose produced by microorganisms and preparation method thereof | |
| CN109180988B (en) | Functionalized nano-cellulose hydrogel and preparation method thereof | |
| Zhang et al. | Aerogel microspheres based on cellulose nanofibrils as potential cell culture scaffolds | |
| WO2018235745A1 (en) | Biocompatible long-fiber nonwoven fabric, production method therefor, three-dimensional scaffold for cell culturing, and cell culturing method using same | |
| CN107519540B (en) | High-strength flexible light-transmitting implantable fibroin/bacterial cellulose/graphene composite conductive film | |
| Naeem et al. | Three-dimensional bacterial cellulose-electrospun membrane hybrid structures fabricated through in-situ self-assembly | |
| CN114570114B (en) | Rush air filtering material and preparation method thereof | |
| CN103147229B (en) | Method for preparing collagen/lactic acid-caprolactone copolymer composite fiber bracket | |
| JP5162167B2 (en) | Composite structure and method for producing the same | |
| CN108273130B (en) | Three-dimensional micro-nano fiber composite support and preparation method thereof | |
| CN108727638B (en) | High-strength graphene/graphene oxide film and production method and equipment thereof | |
| CN110093041A (en) | A kind of acetylated modification fibroin/bacteria cellulose compound water congealing glue film and preparation method thereof | |
| CN106755180A (en) | A kind of method that utilization bacterium static fermentation prepares bio-modification bacteria cellulose NF membrane | |
| CN105856756B (en) | A kind of fibrous composite and preparation method thereof | |
| CN207227839U (en) | A kind of device for producing bacteria cellulose composite material | |
| CN109972233A (en) | The preparation method of the biodegradable alginic acid fibre with high-intensity and high-tenacity | |
| CN108379933A (en) | A kind of silk fibroin nano-fiber filtering material and the air filter unit based on the filtering material | |
| CN114752083A (en) | Method for in-situ culture of bacterial cellulose hydrogel microspheres by using super-hydrophobic interface | |
| CN108379932A (en) | A kind of nanofiber filtration material and the air filter unit based on the filtering material | |
| CN112717472A (en) | Preparation method of mulberry fiber composite three-dimensional oil-water separation membrane | |
| CN112295007A (en) | Preparation method of bacterial cellulose/reduced graphene oxide composite material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |