CN104383875A - Activated carbon adsorbent for haze preventing gauze mask and preparation method thereof - Google Patents
Activated carbon adsorbent for haze preventing gauze mask and preparation method thereof Download PDFInfo
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- CN104383875A CN104383875A CN201410557848.4A CN201410557848A CN104383875A CN 104383875 A CN104383875 A CN 104383875A CN 201410557848 A CN201410557848 A CN 201410557848A CN 104383875 A CN104383875 A CN 104383875A
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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
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
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- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D13/00—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches
- A41D13/05—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches protecting only a particular body part
- A41D13/11—Protective face masks, e.g. for surgical use, or for use in foul atmospheres
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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
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/04—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium
- B01J20/041—Oxides or hydroxides
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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
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/04—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium
- B01J20/046—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium containing halogens, e.g. halides
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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
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/06—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04
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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
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
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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
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/12—Naturally occurring clays or bleaching earth
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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
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/16—Alumino-silicates
- B01J20/18—Synthetic zeolitic molecular sieves
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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
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
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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
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
- B01J20/24—Naturally occurring macromolecular compounds, e.g. humic acids or their derivatives
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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
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
- B01J20/26—Synthetic macromolecular compounds
- B01J20/262—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon to carbon unsaturated bonds, e.g. obtained by polycondensation
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- Organic Chemistry (AREA)
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- Textile Engineering (AREA)
- Engineering & Computer Science (AREA)
- Physical Education & Sports Medicine (AREA)
- General Health & Medical Sciences (AREA)
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- Life Sciences & Earth Sciences (AREA)
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- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
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Abstract
The invention relates to an activated carbon adsorbent for a haze preventing gauze mask. The adsorbent is prepared from the following raw materials in parts by weight: 80-90 parts of activated carbon, 5-8 parts of vermiculite, 2-3 parts of magnesium oxide, 2-3 parts of agar, 7-10 parts of attapulgite clay, 2-3 parts of an epoxy resin solution, 8-10 parts of flower mud leftover materials, 2-3 parts of starch, 1-1.3 parts of ammonium fluorosilicate, 5-7 parts of USY molecular sieves, 230-250 parts of a sodium hydroxide solution of 1Mol/L, 240-260 parts of a calcium chloride solution of 1Mol/L, an appropriate amount of water and 3-5 parts of addition agents. The preparation method for the adsorbent disclosed by the invention is simple, is easy to operate and is suitable for industrial large-scale production, the air filtration effect is good, and the effects of resisting bacteria and preventing haze are good. The addition agents are used, so that skin sensibility can be prevented, the adsorbent can refresh people and restore consciousness, and the filtration property is improved.
Description
Technical field
The present invention relates to absorbent fields, particularly relate to a kind of anti-haze mouth mask acticarbon and preparation method thereof.
Background technology
Haze weather was more and more serious in recent years, PM2.5 severe overweight, containing a large amount of germ and dust in haze, great threat is brought to the health of people, current common mouth mask adsorbent is substantially based on active carbon, but active carbon to the absorption of particulate pollutant and filter effect limited, in air, various Organic Waste Gas Pollution thing also increases gradually, acticarbon can not decompose these pollutants of removing, even if be adsorbed onto on mouth mask, also there is impact to health, therefore in order to ensure that people's is healthy, needing to improve mouth mask adsorbent.
Summary of the invention
The object of the present invention is to provide a kind of anti-haze mouth mask acticarbon and preparation method thereof, this sorbent preparation method is simple, and be easy to operation, be suitable for industrial-scale production, air filtration is effective, and antibacterial anti-haze is effective.
Technical scheme of the present invention is as follows:
A kind of anti-haze mouth mask acticarbon, is characterized in that being made up of the raw material of following weight portion: active carbon 80-90, vermiculite 5-8, magnesia 2-3, agar 2-3, Concave-convex clay rod 7-10, epoxy resin solution 2-3, flower mud leftover pieces 8-10, starch 2-3, ammonium fluosilicate 1-1.3, USY molecular sieve 5-7,1Mol/L sodium hydroxide solution 230-250,1Mol/L calcium chloride solution 240-260, water are appropriate, auxiliary agent 3-5;
Described auxiliary agent is made up of the raw material of following weight portion: grape pip 3-4, ginkgo leaf 1-2, ethanol 4-6, amylan 0.5-1, iron hydroxide 1-2, clay 4-6, tea tree ethereal oil 0.4-0.7, silester 3-4, water are appropriate, preparation method is: by grape pip, ginkgo leaf is pulverized, add water and ethanol decoction, filter to obtain filter cake and slurries, filter cake is dried, with iron hydroxide, clay mixes, be crushed to below 180 orders, with amylan, silester is sent in mixer together, add water and stir into lotion, extruding slivering, then in retort, air heat is completely cut off to 700-800 DEG C, insulation 40-50 minute, obtain carbonized material, carbonized material is used steam activation 2-2.5 hour at 850-900 DEG C, take out, evenly spray the mixture of tea tree ethereal oil and described slurries again, dry, be ground into the particle of below 0.3mm, obtain.
The preparation method of described anti-haze mouth mask acticarbon, is characterized in that comprising the following steps:
(1) vermiculite, flower mud leftover pieces are pulverized, cross 200 mesh sieves, mix with starch, ammonium fluosilicate, add the water of 7-9 times of weight portion, stir 10-14 hour, dehydration by evaporation at 70-80 DEG C, be 4-6% to water content, at 200-250 DEG C, calcine 1-2 hour, pulverize, cross 100 mesh sieves, obtain particle;
(2) other residual components will mix except auxiliary agent, and add water, granulation, roasting 30-40 minute at 500-600 DEG C, pulverized 30 mesh sieves, obtained particle;
(3) particle that first two steps obtain is mixed with auxiliary agent, add 1Mol/L sodium hydroxide solution, be heated to 95-98 DEG C, process 1.5-2 hour, washing, dry;
(4) material that (3) step obtains is added in 1Mol/L calcium chloride solution, be heated to 75-80 DEG C, soak 5-6 hour, washing, dry, to obtain final product.
Beneficial effect of the present invention
Sorbent preparation method of the present invention is simple, and be easy to operation, be suitable for industrial-scale production, air filtration is effective, and antibacterial anti-haze is effective.The application of the invention auxiliary agent, can prevent allergic, produce refreshing effect to the mind, and improves strainability.
Detailed description of the invention
A kind of anti-haze mouth mask acticarbon, is made up of the raw material of following weight portion (kilogram): active carbon 85, vermiculite 6, magnesia 2.5, agar 2.5, Concave-convex clay rod 8, epoxy resin solution 2.5, flower mud leftover pieces 9, starch 2.5, ammonium fluosilicate 1.2, USY molecular sieve 6,1Mol/L sodium hydroxide solution 240,1Mol/L calcium chloride solution 250, water are appropriate, auxiliary agent 4;
Described auxiliary agent is made up of the raw material of following weight portion (kilogram): grape pip 3.5, ginkgo leaf 1.5, ethanol 5, amylan 0.8, iron hydroxide 1.5, clay 5, tea tree ethereal oil 0.6, silester 3.5, water are appropriate, preparation method is: by grape pip, ginkgo leaf is pulverized, add water and ethanol decoction, filter to obtain filter cake and slurries, filter cake is dried, with iron hydroxide, clay mixes, be crushed to below 180 orders, with amylan, silester is sent in mixer together, add water and stir into lotion, extruding slivering, then isolated air heat to 750 DEG C in retort, be incubated 45 minutes, obtain carbonized material, carbonized material is used steam activation 2.3 hours at 880 DEG C, take out, evenly spray the mixture of tea tree ethereal oil and described slurries again, dry, be ground into the particle of below 0.3mm, obtain.
The preparation method of described anti-haze mouth mask acticarbon, comprises the following steps:
(1) vermiculite, flower mud leftover pieces are pulverized, cross 200 mesh sieves, mix with starch, ammonium fluosilicate, add the water of 8 times of weight portions, stirring 12 hours, dehydration by evaporation at 75 DEG C, is 5% to water content, calcines 1.5 hours at 230 DEG C, pulverize, cross 100 mesh sieves, obtain particle;
(2) other residual components will mix except auxiliary agent, and add water, granulation, at 550 DEG C, roasting 35 minutes, pulverized 30 mesh sieves, obtained particle;
(3) particle that first two steps obtain is mixed with auxiliary agent, add 1Mol/L sodium hydroxide solution, be heated to 97 DEG C, process 1.8 hours, washing, dry;
(4) material that (3) step obtains is added in 1Mol/L calcium chloride solution, be heated to 77 DEG C, soak 5.5 hours, washing, dry, to obtain final product.
test data
The specific area of this adsorbent is 490 ㎡/g, is 0.38g/g, this adsorbent is used for non-woven fabrics gauze mask to the saturated extent of adsorption of benzene, is 98.6% to the filter of PM2.5.
Claims (2)
1. an anti-haze mouth mask acticarbon, is characterized in that being made up of the raw material of following weight portion: active carbon 80-90, vermiculite 5-8, magnesia 2-3, agar 2-3, Concave-convex clay rod 7-10, epoxy resin solution 2-3, flower mud leftover pieces 8-10, starch 2-3, ammonium fluosilicate 1-1.3, USY molecular sieve 5-7,1Mol/L sodium hydroxide solution 230-250,1Mol/L calcium chloride solution 240-260, water are appropriate, auxiliary agent 3-5;
Described auxiliary agent is made up of the raw material of following weight portion: grape pip 3-4, ginkgo leaf 1-2, ethanol 4-6, amylan 0.5-1, iron hydroxide 1-2, clay 4-6, tea tree ethereal oil 0.4-0.7, silester 3-4, water are appropriate, preparation method is: by grape pip, ginkgo leaf is pulverized, add water and ethanol decoction, filter to obtain filter cake and slurries, filter cake is dried, with iron hydroxide, clay mixes, be crushed to below 180 orders, with amylan, silester is sent in mixer together, add water and stir into lotion, extruding slivering, then in retort, air heat is completely cut off to 700-800 DEG C, insulation 40-50 minute, obtain carbonized material, carbonized material is used steam activation 2-2.5 hour at 850-900 DEG C, take out, evenly spray the mixture of tea tree ethereal oil and described slurries again, dry, be ground into the particle of below 0.3mm, obtain.
2. the preparation method of anti-haze mouth mask acticarbon according to claim 1, is characterized in that comprising the following steps:
(1) vermiculite, flower mud leftover pieces are pulverized, cross 200 mesh sieves, mix with starch, ammonium fluosilicate, add the water of 7-9 times of weight portion, stir 10-14 hour, dehydration by evaporation at 70-80 DEG C, be 4-6% to water content, at 200-250 DEG C, calcine 1-2 hour, pulverize, cross 100 mesh sieves, obtain particle;
(2) other residual components will mix except auxiliary agent, and add water, granulation, roasting 30-40 minute at 500-600 DEG C, pulverized 30 mesh sieves, obtained particle;
(3) particle that first two steps obtain is mixed with auxiliary agent, add 1Mol/L sodium hydroxide solution, be heated to 95-98 DEG C, process 1.5-2 hour, washing, dry;
(4) material that (3) step obtains is added in 1Mol/L calcium chloride solution, be heated to 75-80 DEG C, soak 5-6 hour, washing, dry, to obtain final product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410557848.4A CN104383875A (en) | 2014-10-21 | 2014-10-21 | Activated carbon adsorbent for haze preventing gauze mask and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410557848.4A CN104383875A (en) | 2014-10-21 | 2014-10-21 | Activated carbon adsorbent for haze preventing gauze mask and preparation method thereof |
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| CN104383875A true CN104383875A (en) | 2015-03-04 |
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| CN201410557848.4A Pending CN104383875A (en) | 2014-10-21 | 2014-10-21 | Activated carbon adsorbent for haze preventing gauze mask and preparation method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104437398A (en) * | 2014-11-12 | 2015-03-25 | 青岛海洋生物医药研究院股份有限公司 | Application of red seaweed polysaccharide, red seaweed oligosaccharide and derivatives thereof to preparation of adsorbing agent for adsorbing air pollutants |
| CN105012067A (en) * | 2015-06-02 | 2015-11-04 | 上海绿强新材料有限公司 | Preparation method of molecular sieve materials used for reusable energy-saving and eco-friendly physical therapy |
| CN105195104A (en) * | 2015-09-01 | 2015-12-30 | 安徽省含山县天顺环保设备有限公司 | Adsorbing agent capable of purifying car exhaust |
| CN108212076A (en) * | 2018-02-27 | 2018-06-29 | 广州尊卓环保科技有限公司 | The preparation method of the spherical filtrate of anti-fine particle and the oronasal mask using the filtrate |
| CN110090623A (en) * | 2019-05-24 | 2019-08-06 | 广州尊卓环保科技有限公司 | Filter out the preparation method of pyrethroid filtrate and its application in mask |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5063196A (en) * | 1989-06-23 | 1991-11-05 | Calgon Carbon Corporation | Chromium-free impregnated activated carbon for adsorption of toxic gases and/or vapors |
| CN101327420A (en) * | 2008-08-01 | 2008-12-24 | 东南大学 | Porous particle compound material with adsorption and reaction capacity and preparation technique material |
| CN101327423A (en) * | 2008-08-01 | 2008-12-24 | 东南大学 | Spherical particle compound material containing active carbon and preparation technique thereof |
| CN103521176A (en) * | 2013-08-30 | 2014-01-22 | 蚌埠德美过滤技术有限公司 | Modified activated carbon hydrogen sulfide adsorbent and preparation method thereof |
| CN103623780A (en) * | 2013-12-11 | 2014-03-12 | 张旭东 | Purifying, adsorbing and sterilizing material and application thereof |
| CN103736460A (en) * | 2013-12-12 | 2014-04-23 | 芜湖中路实业有限责任公司 | Attapulgite flue gas desulfurizer and preparation method thereof |
-
2014
- 2014-10-21 CN CN201410557848.4A patent/CN104383875A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5063196A (en) * | 1989-06-23 | 1991-11-05 | Calgon Carbon Corporation | Chromium-free impregnated activated carbon for adsorption of toxic gases and/or vapors |
| CN101327420A (en) * | 2008-08-01 | 2008-12-24 | 东南大学 | Porous particle compound material with adsorption and reaction capacity and preparation technique material |
| CN101327423A (en) * | 2008-08-01 | 2008-12-24 | 东南大学 | Spherical particle compound material containing active carbon and preparation technique thereof |
| CN103521176A (en) * | 2013-08-30 | 2014-01-22 | 蚌埠德美过滤技术有限公司 | Modified activated carbon hydrogen sulfide adsorbent and preparation method thereof |
| CN103623780A (en) * | 2013-12-11 | 2014-03-12 | 张旭东 | Purifying, adsorbing and sterilizing material and application thereof |
| CN103736460A (en) * | 2013-12-12 | 2014-04-23 | 芜湖中路实业有限责任公司 | Attapulgite flue gas desulfurizer and preparation method thereof |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104437398A (en) * | 2014-11-12 | 2015-03-25 | 青岛海洋生物医药研究院股份有限公司 | Application of red seaweed polysaccharide, red seaweed oligosaccharide and derivatives thereof to preparation of adsorbing agent for adsorbing air pollutants |
| CN105012067A (en) * | 2015-06-02 | 2015-11-04 | 上海绿强新材料有限公司 | Preparation method of molecular sieve materials used for reusable energy-saving and eco-friendly physical therapy |
| CN105195104A (en) * | 2015-09-01 | 2015-12-30 | 安徽省含山县天顺环保设备有限公司 | Adsorbing agent capable of purifying car exhaust |
| CN108212076A (en) * | 2018-02-27 | 2018-06-29 | 广州尊卓环保科技有限公司 | The preparation method of the spherical filtrate of anti-fine particle and the oronasal mask using the filtrate |
| CN110090623A (en) * | 2019-05-24 | 2019-08-06 | 广州尊卓环保科技有限公司 | Filter out the preparation method of pyrethroid filtrate and its application in mask |
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Application publication date: 20150304 |
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