CN114749016A - Preparation method of dust removal and VOCS removal collaborative photocatalytic filter material and prepared filter material - Google Patents
Preparation method of dust removal and VOCS removal collaborative photocatalytic filter material and prepared filter material Download PDFInfo
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- CN114749016A CN114749016A CN202210212380.XA CN202210212380A CN114749016A CN 114749016 A CN114749016 A CN 114749016A CN 202210212380 A CN202210212380 A CN 202210212380A CN 114749016 A CN114749016 A CN 114749016A
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- 239000000463 material Substances 0.000 title claims abstract description 79
- 230000001699 photocatalysis Effects 0.000 title claims abstract description 33
- 238000002360 preparation method Methods 0.000 title claims abstract description 31
- 239000000428 dust Substances 0.000 title description 10
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 claims abstract description 100
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 68
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 67
- 229910001961 silver nitrate Inorganic materials 0.000 claims abstract description 50
- 229910000403 monosodium phosphate Inorganic materials 0.000 claims abstract description 31
- 235000019799 monosodium phosphate Nutrition 0.000 claims abstract description 31
- AJPJDKMHJJGVTQ-UHFFFAOYSA-M sodium dihydrogen phosphate Chemical compound [Na+].OP(O)([O-])=O AJPJDKMHJJGVTQ-UHFFFAOYSA-M 0.000 claims abstract description 31
- 239000012855 volatile organic compound Substances 0.000 claims abstract description 31
- 239000002131 composite material Substances 0.000 claims abstract description 27
- 239000000839 emulsion Substances 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 238000005470 impregnation Methods 0.000 claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 15
- 230000002195 synergetic effect Effects 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims description 28
- 238000007598 dipping method Methods 0.000 claims description 20
- 238000005096 rolling process Methods 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 16
- 238000003825 pressing Methods 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 11
- 238000005303 weighing Methods 0.000 claims description 10
- 239000000853 adhesive Substances 0.000 claims description 9
- 230000001070 adhesive effect Effects 0.000 claims description 9
- 239000004745 nonwoven fabric Substances 0.000 claims description 8
- 238000007493 shaping process Methods 0.000 claims description 8
- 238000009960 carding Methods 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- 239000004744 fabric Substances 0.000 claims description 7
- 239000000835 fiber Substances 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 239000011941 photocatalyst Substances 0.000 abstract description 32
- 229910000161 silver phosphate Inorganic materials 0.000 abstract description 23
- FJOLTQXXWSRAIX-UHFFFAOYSA-K silver phosphate Chemical compound [Ag+].[Ag+].[Ag+].[O-]P([O-])([O-])=O FJOLTQXXWSRAIX-UHFFFAOYSA-K 0.000 abstract description 11
- 229940019931 silver phosphate Drugs 0.000 abstract description 11
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 10
- 239000001569 carbon dioxide Substances 0.000 abstract description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 5
- 238000001556 precipitation Methods 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 238000011065 in-situ storage Methods 0.000 abstract description 4
- 239000002957 persistent organic pollutant Substances 0.000 abstract description 4
- 238000001914 filtration Methods 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 36
- 239000011265 semifinished product Substances 0.000 description 10
- 230000015556 catabolic process Effects 0.000 description 6
- 238000006731 degradation reaction Methods 0.000 description 6
- 238000011068 loading method Methods 0.000 description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 5
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- 229920004933 Terylene® Polymers 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- -1 methane hydrocarbons Chemical class 0.000 description 2
- 150000002894 organic compounds Chemical class 0.000 description 2
- 238000007146 photocatalysis Methods 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 239000004734 Polyphenylene sulfide Substances 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000443 aerosol Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 150000008282 halocarbons Chemical class 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 239000002085 irritant Substances 0.000 description 1
- 231100000021 irritant Toxicity 0.000 description 1
- 230000000622 irritating effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Natural products C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000007539 photo-oxidation reaction Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 231100000378 teratogenic Toxicity 0.000 description 1
- 230000003390 teratogenic effect Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8678—Removing components of undefined structure
- B01D53/8687—Organic components
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/14—Phosphorus; Compounds thereof
- B01J27/16—Phosphorus; Compounds thereof containing oxygen, i.e. acids, anhydrides and their derivates with N, S, B or halogens without carriers or on carriers based on C, Si, Al or Zr; also salts of Si, Al and Zr
- B01J27/18—Phosphorus; Compounds thereof containing oxygen, i.e. acids, anhydrides and their derivates with N, S, B or halogens without carriers or on carriers based on C, Si, Al or Zr; also salts of Si, Al and Zr with metals other than Al or Zr
- B01J27/1802—Salts or mixtures of anhydrides with compounds of other metals than V, Nb, Ta, Cr, Mo, W, Mn, Tc, Re, e.g. phosphates, thiophosphates
- B01J27/1817—Salts or mixtures of anhydrides with compounds of other metals than V, Nb, Ta, Cr, Mo, W, Mn, Tc, Re, e.g. phosphates, thiophosphates with copper, silver or gold
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/02—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
- B01J31/06—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides containing polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/26—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/39—Photocatalytic properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0201—Impregnation
- B01J37/0203—Impregnation the impregnation liquid containing organic compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/03—Precipitation; Co-precipitation
- B01J37/031—Precipitation
- B01J37/035—Precipitation on carriers
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
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Abstract
The invention discloses a preparation method of a dust-removing VOCS (volatile organic Compounds) synergistic photocatalytic filter material, which comprises the following steps of: (1) silver nitrate solutionPreparing; (2) preparing sodium dihydrogen phosphate/PTFE composite film-forming impregnation liquid; (3) preparing a needled felt; (4) filtering material first-step treatment; (5) and (5) performing second-step treatment on the filter material. The invention adopts Ag3PO4As the photocatalyst, the PTFE needle punched filter material is soaked in silver nitrate solution to be completely soaked and fully absorbed, and then is placed in the PTFE and sodium dihydrogen phosphate composite emulsion, at the moment, the silver nitrate in the PTFE filter material and the sodium dihydrogen phosphate in the composite emulsion generate in-situ precipitation reaction to generate the silver phosphate photocatalyst, Ag3PO4The photocatalyst can be uniformly distributed on the filter material, and Ag3PO4The photocatalyst has good photocatalytic performance under both visible light and ultraviolet light, and can effectively oxidize and reduce organic pollutants into water and carbon dioxide.
Description
Technical Field
The invention relates to the technical field of filter material production, in particular to a preparation method of a dust-removing VOCS (volatile organic Compounds) synergistic photocatalytic filter material and the prepared filter material.
Background
The bag type dust collector is used as a dry type dust collection device, has high dust collection efficiency, can reach more than 99% under normal conditions, and the filter bag is used as the core of the bag type dust collector to play a vital role, and the filter bag commonly used in the market at present is generally non-woven fabric, such as low-temperature terylene and acrylic, high-temperature PTFE, PPS, glass fiber and the like.
The coal-fired power plant generates VOCs due to insufficient combustion, and the VOCs are generally classified into non-methane hydrocarbons (NMHCs), oxygen-containing organic compounds, halogenated hydrocarbons, nitrogen-containing organic compounds, sulfur-containing organic compounds, and the like. VOCs participate in the formation of ozone and secondary aerosols in the atmospheric environment, which have important effects on regional atmospheric ozone pollution and PM2.5 pollution. Most VOCs have unpleasant special odor and have toxic, irritant, teratogenic and carcinogenic effects, and particularly benzene, toluene, formaldehyde and the like cause great harm to human health. Currently, the coal-fired power plants mostly adopt activated carbon to adsorb VOCs.
Silver phosphate (Ag)3PO4) As a semiconductor photocatalyst, the photocatalyst has good photocatalytic performance under visible light,under the irradiation of sunlight or ultraviolet light, the photooxidation reaction can be generated to oxidize and reduce organic matters into water and carbon dioxide, which belongs to one of advanced oxidation technologies.
Similar research is carried out at present by combining photocatalysis with non-woven filter materials, but most of the photocatalysis filter materials are directly prepared and are not combined with dust removal filter bags. The loading mode is simple, the prepared photocatalyst and emulsion are soaked through post-treatment, and the photocatalyst is loaded under the action of an adhesive, so that the photocatalyst filter material obtained by the method has the advantages that firstly, the photocatalyst is insoluble in water and is easy to precipitate, so that the dispersion degree of a mixed solution of the photocatalyst and the emulsion is required, and secondly, the photocatalyst loaded on the photocatalyst filter material obtained by the method is not uniform, for example, patent CN103341289B discloses a loaded nano TiO supported photocatalyst2The preparation method of terylene needling filter material is characterized by preparing TiO2PTFE emulsion prepared by impregnating TiO2Loading on the surface of the terylene needle punched filter material to obtain the photocatalytic filter material. The technical method is to treat TiO by post-treatment2Carrying out the loading due to TiO2The photocatalyst is solid and is easy to generate precipitation in emulsion, so the photocatalytic filter material prepared by the method is distributed with TiO2Is not uniform. The photocatalyst has a great application prospect in the aspect of filter materials.
Disclosure of Invention
The technical problem to be solved by the invention is to solve the existing method for dipping TiO2Method for loading on filter material, and prepared photocatalytic filter material with TiO distribution2Non-uniformity problems.
The invention solves the technical problems through the following technical means:
a preparation method of a dust-removing VOCS-removing synergetic photocatalytic filter material comprises the following steps:
(1) preparation of silver nitrate solution
Weighing 10-30g of silver nitrate, placing in 390mL of water, and stirring until the silver nitrate is dissolved;
(2) preparation of sodium dihydrogen phosphate/PTFE composite film-forming impregnation liquid
Weighing 5-20g of sodium dihydrogen phosphate, dissolving in 390mL of water, adding 30g of PTFE emulsion and 5g of adhesive, and uniformly stirring on a magnetic stirrer to prepare sodium dihydrogen phosphate/PTFE composite film-forming impregnation liquid of PTFE non-woven fabric;
(3) preparation of needled felt
Opening, mixing, finely opening, carding, lapping, adding PTFE base cloth and needling PTFE short fibers to prepare a semi-finished needled felt;
(4) first step treatment of filter material
Dipping the semi-finished needled felt obtained in the step (3) in the silver nitrate solution prepared in the step (1) through a dipping-pressing process to enable the needled felt to fully absorb the silver nitrate solution, carrying out first-step mangling and drying to obtain a silver nitrate semi-finished needled felt;
(5) second step treatment of filter material
And (3) dipping the silver nitrate semi-finished needled felt obtained in the step (4) into the sodium dihydrogen phosphate/PTFE composite film-forming dipping solution prepared in the step (2) by a dipping-pressing process, controlling the speed to enable the needled felt to fully react until the yellow green is not deepened, carrying out second-step solution rolling, and carrying out high-temperature shaping to obtain the photocatalytic filter material.
The invention adopts Ag3PO4As the photocatalyst, the PTFE needle punched filter material is soaked in silver nitrate solution to be completely soaked and fully absorbed, and then is placed in the PTFE and sodium dihydrogen phosphate composite emulsion, at the moment, the silver nitrate in the PTFE filter material and the sodium dihydrogen phosphate in the composite emulsion generate in-situ precipitation reaction to generate the silver phosphate photocatalyst, Ag3PO4The photocatalyst can be uniformly distributed on the filter material, and Ag3PO4The photocatalyst has good photocatalytic performance under both visible light and ultraviolet light, and can effectively oxidize and reduce organic pollutants into water and carbon dioxide.
During impregnation, due to the addition of a proper amount of PTFE emulsion, the PTFE emulsion has a film forming effect and can also be beneficial to the stability of photocatalyst loading.
Preferably, the adhesive in the step (2) is epoxy resin.
Preferably, the stirring speed in the step (2) is 300-600r/min, and the stirring time is 30 min.
Preferably, the unit gram weight of the semi-finished needled felt prepared in the step (3) is controlled to be 780-830g/m2。
Preferably, the temperature for drying in the step (4) is 120-150 ℃.
Preferably, the pressure in the step (4) is adjusted to be 0.3-0.5MPa, and the mangle rolling rate is ensured to be more than 90%.
Has the advantages that: the mangle rolling rate is ensured to be over 90 percent by controlling the pressure of the mangle, and the content of silver nitrate in the needled filter material is further ensured.
Preferably, the speed in the step (5) is controlled to be 3 m/min.
Preferably, the pressure in the step (5) is adjusted to be 0.1-0.2MPa, so that the mangle rolling rate is over 60-80%.
Preferably, the temperature for high-temperature setting in the step (5) is 250-260 ℃.
The invention also provides a filter material prepared by the preparation method.
The invention has the following beneficial effects:
1. the invention adopts Ag3PO4As the photocatalyst, the PTFE needle punched filter material is soaked in silver nitrate solution to be completely soaked and fully absorbed, and then is placed in the PTFE and sodium dihydrogen phosphate composite emulsion, at the moment, the silver nitrate in the PTFE filter material and the sodium dihydrogen phosphate in the composite emulsion generate in-situ precipitation reaction to generate the silver phosphate photocatalyst, Ag3PO4The photocatalyst can be uniformly distributed on the filter material, and Ag3PO4The photocatalyst has good photocatalytic performance under both visible light and ultraviolet light, and can effectively oxidize and reduce organic pollutants into water and carbon dioxide.
2. During impregnation, due to the addition of a proper amount of PTFE emulsion, the PTFE emulsion has a film forming effect and can also be beneficial to the stability of photocatalyst loading.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below through the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
Test materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
The specific techniques or conditions not specified in the examples can be performed according to the techniques or conditions described in the literature in the field or according to the product specification.
Example 1
A preparation method of a dust-removing VOCS-removing synergetic photocatalytic filter material comprises the following steps:
(1) preparation of silver nitrate solution
Weighing 10-20g of silver nitrate, placing in 390mL of water, and stirring until the silver nitrate is dissolved;
(2) preparation of sodium dihydrogen phosphate/PTFE composite film-forming impregnation liquid
Weighing 5-10g of sodium dihydrogen phosphate, dissolving in 390mL of water, adding 30g of PTFE emulsion and 5g of epoxy resin, and stirring for 30min at the speed of 500r/min on a magnetic stirrer to prepare sodium dihydrogen phosphate/PTFE composite film-forming impregnation liquid of PTFE non-woven fabric;
(3) preparation of needled felt
The PTFE short fiber is subjected to opening, mixing, fine opening, carding, lapping, PTFE base cloth adding and needle punching to prepare a semi-finished product needle-punched felt, and the unit gram weight of the prepared semi-finished product needle-punched felt is controlled to be 780-activated 830g/m2；
(4) First step treatment of filter material
Dipping the semi-finished needled felt obtained in the step (3) in the silver nitrate solution prepared in the step (1) through a dipping-pressing process to enable the needled felt to fully absorb the silver nitrate solution, carrying out first-step mangling, adjusting the pressure to be 0.4MPa to ensure that the mangling rate is over 90 percent and the content of silver nitrate in a needled filter material is ensured, and drying at 120 ℃ to obtain the silver nitrate semi-finished needled felt;
(5) second step treatment of filter material
And (3) dipping the silver nitrate semi-finished needled felt obtained in the step (4) into the sodium dihydrogen phosphate/PTFE composite film-forming dipping solution prepared in the step (2) by a dipping-pressing process, controlling the speed to be 3m/min, fully reacting the needled felt until the yellow green is not deepened, carrying out second-step solution rolling, adjusting the pressure to be 0.2MPa, ensuring the solution rolling rate to be more than 60-80%, and carrying out high-temperature shaping at 250 ℃ to obtain the photocatalytic filter material.
The prepared filter material was subjected to a test for VOCs degradation, and the test results are shown in Table 1.
Example 2
A preparation method of a dust removal VOCS removal collaborative photocatalytic filter material comprises the following steps:
(1) preparation of silver nitrate solution
Weighing 20-30g of silver nitrate, placing in 390mL of water, and stirring until the silver nitrate is dissolved;
(2) preparation of sodium dihydrogen phosphate/PTFE composite film-forming impregnation liquid
Weighing 10-15g of sodium dihydrogen phosphate, dissolving in 390mL of water, adding 30g of PTFE emulsion and 5g of adhesive, and stirring for 30min at the speed of 500r/min on a magnetic stirrer to prepare sodium dihydrogen phosphate/PTFE composite film-forming impregnation liquid of PTFE non-woven fabric;
(3) preparation of needled felt
The PTFE short fiber is made into a semi-finished product needled felt through opening, mixing, fine opening, carding, lapping, adding PTFE base cloth and needling, and the unit gram weight of the prepared semi-finished product needled felt is controlled to 780-doped 830g/m2；
(4) First-step treatment of filter material
Dipping the semi-finished needled felt obtained in the step (3) in the silver nitrate solution prepared in the step (1) through a dipping-pressing process to enable the needled felt to fully absorb the silver nitrate solution, carrying out first-step mangling, adjusting the pressure to be 0.4MPa to ensure that the mangling rate is over 90 percent and the content of silver nitrate in a needled filter material is ensured, and drying at 120 ℃ to obtain the silver nitrate semi-finished needled felt;
(5) second step treatment of filter material
And (3) dipping the silver nitrate semi-finished needled felt obtained in the step (4) into the sodium dihydrogen phosphate/PTFE composite film-forming dipping solution prepared in the step (2) by a dipping-pressing process, controlling the speed to be 3m/min, fully reacting the needled felt until the yellow green is not deepened, carrying out second-step solution rolling, adjusting the pressure to be 0.2MPa, ensuring the solution rolling rate to be more than 60-80%, and carrying out high-temperature shaping at 250 ℃ to obtain the photocatalytic filter material.
The prepared filter material was subjected to a test for VOCs degradation, and the test results are shown in Table 1.
Example 3
A preparation method of a dust removal VOCS removal collaborative photocatalytic filter material comprises the following steps:
(1) preparation of silver nitrate solution
Weighing 30-40g of silver nitrate, placing in 390mL of water, and stirring until the silver nitrate is dissolved;
(2) preparation of sodium dihydrogen phosphate/PTFE composite film-forming impregnation liquid
Weighing 15-20g of sodium dihydrogen phosphate, dissolving in 390mL of water, adding 30g of PTFE emulsion and 5g of adhesive, and stirring for 30min on a magnetic stirrer at the speed of 500r/min to prepare sodium dihydrogen phosphate/PTFE composite film-forming impregnation liquid of PTFE non-woven fabric;
(3) preparation of needled felt
The PTFE short fiber is made into a semi-finished product needled felt through opening, mixing, fine opening, carding, lapping, adding PTFE base cloth and needling, and the unit gram weight of the prepared semi-finished product needled felt is controlled to 780-doped 830g/m2；
(4) First step treatment of filter material
Dipping the semi-finished needled felt obtained in the step (3) in the silver nitrate solution prepared in the step (1) through a dipping-pressing process to enable the needled felt to fully absorb the silver nitrate solution, carrying out first-step mangling, adjusting the pressure to be 0.4MPa to ensure that the mangling rate is over 90 percent and the content of silver nitrate in a needled filter material is ensured, and drying at 120 ℃ to obtain the silver nitrate semi-finished needled felt;
(5) second step treatment of filter material
And (3) dipping the silver nitrate semi-finished needled felt obtained in the step (4) into the sodium dihydrogen phosphate/PTFE composite film-forming dipping solution prepared in the step (2) by a dipping-pressing process, controlling the speed to be 3m/min, fully reacting the needled felt until the yellow green is not deepened, carrying out second-step solution rolling, adjusting the pressure to be 0.2MPa, ensuring the solution rolling rate to be more than 60-80%, and carrying out high-temperature shaping at 250 ℃ to obtain the photocatalytic filter material.
The prepared filter material was subjected to a test for VOCs degradation, and the test results are shown in Table 1.
Comparative example 1
1. Preparation of silver phosphate
30g of silver nitrate is dissolved in 250mL of water; further, 15g of sodium dihydrogen phosphate was dissolved in 250mL of water, and the sodium dihydrogen phosphate solution was slowly added dropwise to the silver nitrate solution to produce a silver phosphate photocatalyst.
2. Preparation of silver phosphate/PTFE composite film-forming impregnation liquid
And (3) adding 30g of PTFE emulsion into the silver phosphate photocatalyst solution obtained in the step (1), adding 5g of adhesive, and stirring for 30min on a magnetic stirrer at the speed of 500r/min to prepare the silver phosphate/PTFE composite film-forming impregnation liquid of the PTFE non-woven fabric.
3. Preparation of needled felt
The PTFE short fiber is made into a semi-finished product needled felt through opening, mixing, fine opening, carding, lapping, adding PTFE base cloth and needling, and the unit gram weight of the prepared semi-finished product needled felt is controlled to 780-doped 830g/m2。
4. First step treatment of filter material
And (3) dipping the semi-finished needled felt obtained in the step (3) in the silver phosphate/PTFE composite film-forming dipping solution prepared in the step (2) through a dipping-rolling process, carrying out rolling, adjusting the pressure to be 0.2MPa, and carrying out high-temperature shaping at 250 ℃ to obtain the filter material.
5. The prepared filter material was subjected to a test for VOCs degradation, and the test results are shown in Table 1.
Comparative example 2
1. Preparation of PTFE emulsion
Adding 30g of PTFE emulsion into 390mL of water, adding 5g of adhesive, and stirring for 30min at the speed of 500r/min on a magnetic stirrer to prepare PTFE impregnation liquid of the PTFE non-woven fabric.
3. Preparation of needled felt
The PTFE short fiber is made into a semi-finished product needled felt through opening, mixing, fine opening, carding, lapping, adding PTFE base cloth and needling, and the unit gram weight of the prepared semi-finished product needled felt is controlled to 780-doped 830g/m2。
4. First step treatment of filter material
And (3) dipping the semi-finished needled felt obtained in the step (3) in the PTFE dipping solution prepared in the step (1) through a dipping-pressing process, carrying out liquid rolling, adjusting the pressure to be 0.2MPa, and carrying out high-temperature shaping at 250 ℃ to obtain the filter material.
5. Performance detection
The prepared filter material was subjected to a test for VOCs degradation, and the test results are shown in Table 1.
Table 1 shows the test results of VOCs degradation of filter material for removing dust and VOCs
In conclusion, the invention adopts Ag3PO4As the photocatalyst, the PTFE needle punched filter material is soaked in silver nitrate solution to be completely soaked and fully absorbed, and then is placed in the PTFE and sodium dihydrogen phosphate composite emulsion, at the moment, the silver nitrate in the PTFE filter material and the sodium dihydrogen phosphate in the composite emulsion generate in-situ precipitation reaction to generate the silver phosphate photocatalyst, Ag3PO4The photocatalyst can be uniformly distributed on the filter material, and Ag3PO4The photocatalyst has good photocatalytic performance under both visible light and ultraviolet light, and can effectively oxidize and reduce organic pollutants into water and carbon dioxide.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A preparation method of a dust-removing VOCS-removing synergetic photocatalytic filter material is characterized by comprising the following steps:
(1) preparation of silver nitrate solution
Weighing 10-30g of silver nitrate, placing in 390mL of water, and stirring until the silver nitrate is dissolved;
(2) preparation of sodium dihydrogen phosphate/PTFE composite film-forming impregnation liquid
Weighing 5-20g of sodium dihydrogen phosphate, dissolving in 390mL of water, adding 30g of PTFE emulsion and 5g of adhesive, and uniformly stirring on a magnetic stirrer to prepare sodium dihydrogen phosphate/PTFE composite film-forming impregnation liquid of PTFE non-woven fabric;
(3) preparation of needled felt
Opening, mixing, finely opening, carding, lapping, adding PTFE base cloth and needling the PTFE short fiber to prepare a semi-finished needled felt;
(4) first-step treatment of filter material
Dipping the semi-finished needled felt obtained in the step (3) in the silver nitrate solution prepared in the step (1) through a dipping-pressing process to enable the needled felt to fully absorb the silver nitrate solution, carrying out first-step mangling and drying to obtain a silver nitrate semi-finished needled felt;
(5) second step treatment of filter material
And (3) dipping the silver nitrate semi-finished needled felt obtained in the step (4) into the sodium dihydrogen phosphate/PTFE composite film-forming dipping solution prepared in the step (2) by a dipping-pressing process, controlling the speed to enable the needled felt to fully react until the yellow green is not deepened, carrying out second-step solution rolling, and carrying out high-temperature shaping to obtain the photocatalytic filter material.
2. The method for preparing the dedusting and VOCS synergistic photocatalytic filter material as claimed in claim 1, is characterized in that: the adhesive in the step (2) is epoxy resin.
3. The method for preparing the dedusting and VOCS synergistic photocatalytic filter material as claimed in claim 1, is characterized in that: the stirring speed in the step (2) is 300-600r/min, and the stirring time is 30 min.
4. The method for preparing the dedusting and VOCS synergistic photocatalytic filter material as claimed in claim 1, is characterized in that: the unit gram weight of the semi-finished needled felt prepared in the step (3) is controlled to be 780-830g/m2。
5. The method for preparing the dedusting VOCS (volatile organic Compounds) synergistic photocatalytic filter material according to claim 1, is characterized in that: the temperature for drying in the step (4) is 120-150 ℃.
6. The method for preparing the dedusting VOCS (volatile organic Compounds) synergistic photocatalytic filter material according to claim 1, is characterized in that: in the step (4), the pressure is adjusted to be 0.3-0.5MPa, and the mangle rolling rate is ensured to be more than 90%.
7. The method for preparing the dedusting VOCS (volatile organic Compounds) synergistic photocatalytic filter material according to claim 1, is characterized in that: and (5) controlling the speed to be 3 m/min.
8. The method for preparing the dedusting VOCS (volatile organic Compounds) synergistic photocatalytic filter material according to claim 1, is characterized in that: in the step (5), the pressure is adjusted to be 0.1-0.2MPa, and the mangle rolling rate is ensured to be above 60-80%.
9. The method for preparing the dedusting and VOCS synergistic photocatalytic filter material as claimed in claim 1, is characterized in that: the temperature for high-temperature shaping in the step (5) is 250-260 ℃.
10. The filter material prepared by the method for preparing the dust-removing VOCS-removing synergetic photocatalytic filter material according to any one of claims 1 to 9.
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| CN115382387A (en) * | 2022-08-03 | 2022-11-25 | 厦门中创环保科技股份有限公司 | Manufacturing process of formaldehyde-removing felt and formaldehyde-removing felt |
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