CN106607010A - Modified environmental protection material and preparation method thereof - Google Patents

Modified environmental protection material and preparation method thereof Download PDF

Info

Publication number
CN106607010A
CN106607010A CN201611246986.6A CN201611246986A CN106607010A CN 106607010 A CN106607010 A CN 106607010A CN 201611246986 A CN201611246986 A CN 201611246986A CN 106607010 A CN106607010 A CN 106607010A
Authority
CN
China
Prior art keywords
parts
environmental protection
limestone
formaldehyde
lecithin
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.)
Pending
Application number
CN201611246986.6A
Other languages
Chinese (zh)
Inventor
不公告发明人
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Henan Times Cloud Communication Technology Co Ltd
Original Assignee
Henan Times Cloud Communication Technology Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Henan Times Cloud Communication Technology Co Ltd filed Critical Henan Times Cloud Communication Technology Co Ltd
Priority to CN201611246986.6A priority Critical patent/CN106607010A/en
Publication of CN106607010A publication Critical patent/CN106607010A/en
Pending legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation 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
    • B01D53/02Separation 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 by adsorption, e.g. preparative gas chromatography
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/0203Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
    • B01J20/0274Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04 characterised by the type of anion
    • B01J20/0277Carbonates of compounds other than those provided for in B01J20/043
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/04Solid 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
    • B01J20/043Carbonates or bicarbonates, e.g. limestone, dolomite, aragonite
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/22Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
    • B01J20/24Naturally occurring macromolecular compounds, e.g. humic acids or their derivatives
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2257/00Components to be removed
    • B01D2257/70Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2258/00Sources of waste gases
    • B01D2258/06Polluted air

Landscapes

  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • General Preparation And Processing Of Foods (AREA)

Abstract

The invention discloses a modified environmental protection material and a preparation method thereof. The modified environmental protection material is composed of the following raw materials by weight: 35-45 parts of limestone, 11-19 parts of zirconium carbonate, 8-16 parts of konjac glucomannan, and 1-5 parts of lecithin. The preparation method includes: subjecting limestone and konjac glucomannan to mixing grinding, conducting treatment with zirconium carbonate, and then adding lecithin for interaction so as to obtain the modified environmental protection material for adsorbing pollutant formaldehyde in indoor air. The modified environmental protection material provided by the invention is cheap, has wide raw material sources, and can achieve deep removal of formaldehyde. Also after adsorbing formaldehyde, the modified environmental protection material can be used as an easily degradable plant fertilizer, and has no secondary pollution to the environment. The adsorption elimination reaction to formaldehyde adopted by the invention can be quickly completed under indoor conditions without other additional conditions. The modified environmental protection material provided by the invention has the advantages of no toxicity to human body, no corrosion and stable performance. The preparation method has the characteristics of simple operation, environmental protection and no pollution, thus being convenient for industrial production.

Description

A kind of modified environment-friendly material and preparation method thereof
Technical field
The present invention relates to environment-friendly materials technical field, specifically a kind of modified environment-friendly material and preparation method thereof.
Background technology
Formaldehyde is a kind of Systematic toxin, and it can reduce the oxidation resistance of each organ of body, so as to cause organ Oxidative damage, and the higher damage of concentration is more serious.Indoor formaldehyde pollution is mainly derived from furniture, building source, fabric, wood Product filler, cosmetics, cleaning agent and personal belongings etc..At present, take various methods both at home and abroad to administer indoor formaldehyde Pollution, these purification techniques summarize to get up mainly to have:Adsorption technology, photocatalysis technology, negative aeroion technology, chemistry neutralization skill Art, ozonation technology, biotechnology, room-temperature catalytic oxidation technology, material sealing technique etc..It is each have their own excellent in these technologies Point, such as photocatalysis technology can be degraded indoor formaldehyde, but due to which indoors, the light that can produce photocatalysiss is less, and effect has Limit;Be also good method using anion technology and ozone technology, but produce during air will be made proper amount of anion or Ozone is to need suitable condition;The method that chemical neutralization technology and room-temperature catalytic oxidation have been, in general with regard to energy Eliminate formaldehyde;Using biotechnology be a kind of preferable method, use condition and generation effect it is all relatively limited;Using material Sealing technique can not thoroughly completely cut off nuisance, and the persistent period for being reduced release nuisance can be more long;And adopt adsorption technology It is one of current main flow purification techniques, it is because being less subject to the impact of other conditions for using, and is widely used.
Conventional formaldehyde adsorbent is usually activated carbon, and Activated Carbon Production is relatively costly, and is needed using a large amount of forests Resource or coal resources, therefore, seek to have the methyl aldehyde adsorption material for substituting activated carbon to be have very important meaning.In recent years Have shown that there is extremely strong fungistatic effect, and the various harmful weights of absorption of energy through the limestone processed come many researchs in the world Metal and harmful gass.But limestone is and other various raw material complex roles with identical effect in prior art, Individually limestone is adsorbed with toxic gas DeGrain, and prior art is to its complex disposal process, high cost, it is impossible to meet Need.
The content of the invention
It is an object of the invention to provide a kind of stable performance, low production cost, environment friendly and pollution-free, efficient absorption formaldehyde Modified environment-friendly material and its preparation method and application, to solve the problems, such as to propose in above-mentioned background technology.
For achieving the above object, the present invention provides following technical scheme:
A kind of modified environment-friendly material, is made up of the following raw material according to weight portion:Limestone 35-45 parts, zirconium carbonate 11-19 Part, Rhizoma amorphophalli glucomannan 8-16 parts, lecithin 1-5 parts.
As further scheme of the invention:The modified environment-friendly material, is made up of the following raw material according to weight portion:Stone Lime stone 38-42 parts, zirconium carbonate 13-17 parts, Rhizoma amorphophalli glucomannan 10-14 parts, lecithin 2-4 parts.
As further scheme of the invention:The modified environment-friendly material, is made up of the following raw material according to weight portion:Stone 40 parts of lime stone, 15 parts of zirconium carbonate, 12 parts of Rhizoma amorphophalli glucomannan, 3 parts of lecithin.
Another object of the present invention is to provide a kind of preparation method of modified environment-friendly material, comprises the steps of:
1) deionized water of 8.2 times of zirconium carbonate and its quality is mixed, carbonic acid zirconium solution is obtained;
2) by limestone and Rhizoma amorphophalli glucomannan mixed grinding, carbonic acid zirconium solution is added, 85 DEG C is heated to and in the temperature Lower sealing stir process 68min, is subsequently adding lecithin, is warming up to 92 DEG C and stir process 38min at such a temperature, then drops To 58 DEG C and at such a temperature supersound process 56min, ultrasonic power is 900W, then is stirred at a temperature of 103-105 DEG C to dry, Then 2.8h is calcined in 400 DEG C of Muffle furnace obtain final product modified environment-friendly material.
Another object of the present invention is to provide application of the modified environment-friendly material in formaldehyde treated.
Compared with prior art, the invention has the beneficial effects as follows:
The present invention is processed using zirconium carbonate, is added lecithin to limestone and Rhizoma amorphophalli glucomannan mixed grinding Modified environment-friendly material obtained in interacting, for the Pollutant Formaldehyde in efficient absorption room air.Compared with activated carbon, this Invention low price, raw material extensively, and are capable of profound except formaldehyde.Modified environment-friendly material after formaldehyde adsorption can simultaneously So that as a kind of degradable vegetable fertilizer, secondary pollution will not be caused to environment.The absorption of the PARA FORMALDEHYDE PRILLS(91,95) that the present invention is adopted disappears Except reaction can be just quickly completed in room conditions, it is not necessary to other additional conditions.The present invention is to people's nonhazardouss, corrosion-free Property, stable performance, preparation method are simple to operate, and low production cost is environment friendly and pollution-free, is easy to industrialized production.
Specific embodiment
Below in conjunction with the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, Obviously, described embodiment is only a part of embodiment of the invention, rather than the embodiment of whole.Based in the present invention Embodiment, the every other embodiment obtained under the premise of creative work is not made by those of ordinary skill in the art, all Belong to the scope of protection of the invention.
Embodiment 1
In the embodiment of the present invention, a kind of modified environment-friendly material is made up of the following raw material according to weight portion:Limestone 35 Part, 11 parts of zirconium carbonate, 8 parts of Rhizoma amorphophalli glucomannan, 1 part of lecithin.
8.2 times of deionized water of zirconium carbonate and its quality is mixed, carbonic acid zirconium solution is obtained.By limestone and Amorphophallus rivieri glucomannan Polysaccharide mixed grinding, adds carbonic acid zirconium solution, is heated to 85 DEG C and seals stir process 68min at such a temperature, is subsequently adding Lecithin, is warming up to 92 DEG C and stir process 38min at such a temperature, is then down to 58 DEG C and supersound process at such a temperature 56min, ultrasonic power are 900W, then are stirred at a temperature of 103 DEG C to dry, then calcine 2.8h in 400 DEG C of Muffle furnace Obtain final product modified environment-friendly material.
Embodiment 2
In the embodiment of the present invention, a kind of modified environment-friendly material is made up of the following raw material according to weight portion:Limestone 45 Part, 19 parts of zirconium carbonate, 16 parts of Rhizoma amorphophalli glucomannan, 5 parts of lecithin.
8.2 times of deionized water of zirconium carbonate and its quality is mixed, carbonic acid zirconium solution is obtained.By limestone and Amorphophallus rivieri glucomannan Polysaccharide mixed grinding, adds carbonic acid zirconium solution, is heated to 85 DEG C and seals stir process 68min at such a temperature, is subsequently adding Lecithin, is warming up to 92 DEG C and stir process 38min at such a temperature, is then down to 58 DEG C and supersound process at such a temperature 56min, ultrasonic power are 900W, then are stirred at a temperature of 105 DEG C to dry, then calcine 2.8h in 400 DEG C of Muffle furnace Obtain final product modified environment-friendly material.
Embodiment 3
In the embodiment of the present invention, a kind of modified environment-friendly material is made up of the following raw material according to weight portion:Limestone 38 Part, 13 parts of zirconium carbonate, 10 parts of Rhizoma amorphophalli glucomannan, 2 parts of lecithin.
8.2 times of deionized water of zirconium carbonate and its quality is mixed, carbonic acid zirconium solution is obtained.By limestone and Amorphophallus rivieri glucomannan Polysaccharide mixed grinding, adds carbonic acid zirconium solution, is heated to 85 DEG C and seals stir process 68min at such a temperature, is subsequently adding Lecithin, is warming up to 92 DEG C and stir process 38min at such a temperature, is then down to 58 DEG C and supersound process at such a temperature 56min, ultrasonic power are 900W, then are stirred at a temperature of 104 DEG C to dry, then calcine 2.8h in 400 DEG C of Muffle furnace Obtain final product modified environment-friendly material.
Embodiment 4
In the embodiment of the present invention, a kind of modified environment-friendly material is made up of the following raw material according to weight portion:Limestone 42 Part, 17 parts of zirconium carbonate, 14 parts of Rhizoma amorphophalli glucomannan, 4 parts of lecithin.
8.2 times of deionized water of zirconium carbonate and its quality is mixed, carbonic acid zirconium solution is obtained.By limestone and Amorphophallus rivieri glucomannan Polysaccharide mixed grinding, adds carbonic acid zirconium solution, is heated to 85 DEG C and seals stir process 68min at such a temperature, is subsequently adding Lecithin, is warming up to 92 DEG C and stir process 38min at such a temperature, is then down to 58 DEG C and supersound process at such a temperature 56min, ultrasonic power are 900W, then are stirred at a temperature of 104 DEG C to dry, then calcine 2.8h in 400 DEG C of Muffle furnace Obtain final product modified environment-friendly material.
Embodiment 5
In the embodiment of the present invention, a kind of modified environment-friendly material is made up of the following raw material according to weight portion:Limestone 40 Part, 15 parts of zirconium carbonate, 12 parts of Rhizoma amorphophalli glucomannan, 3 parts of lecithin.
8.2 times of deionized water of zirconium carbonate and its quality is mixed, carbonic acid zirconium solution is obtained.By limestone and Amorphophallus rivieri glucomannan Polysaccharide mixed grinding, adds carbonic acid zirconium solution, is heated to 85 DEG C and seals stir process 68min at such a temperature, is subsequently adding Lecithin, is warming up to 92 DEG C and stir process 38min at such a temperature, is then down to 58 DEG C and supersound process at such a temperature 56min, ultrasonic power are 900W, then are stirred at a temperature of 104 DEG C to dry, then calcine 2.8h in 400 DEG C of Muffle furnace Obtain final product modified environment-friendly material.
Comparative example 1
In addition to zirconium carbonate is not contained, its material content and preparation process are consistent with embodiment 5.
Comparative example 2
In addition to ultrasound treatment step is not contained in preparation process, its material content and preparation process are consistent with embodiment 5.
Comparative example 3
In addition to ultrasound treatment step is not contained in zirconium carbonate and preparation process is not contained, its material content and preparation process It is consistent with embodiment 5.
Embodiment 6
Performance test is carried out to product obtained in embodiment 1-5 and comparative example 1-3.Method is to prepare one containing finite concentration The environment of formaldehyde, then goes to eliminate with the modified environment-friendly material of certain mass, by the amount of the remaining formaldehyde of national standard detection, calculates Go out to be eliminated the amount of formaldehyde.
Concrete operations mode is as follows:1g or 2g powder body is put in the confined space of a 500ml, the formaldehyde of 1 μ g is injected. Stand 24 as a child to extract gas in confined space out, be passed through in the mixed solution of acetylacetone,2,4-pentanedione and ammonium acetate, 60 DEG C of thermostatted waters Bath heating surveys ultraviolet-visible spectrum in 15 minutes after solution changes color, obtains the absorbance of sample.Then can be with according to regression equation Contained remaining formaldehyde amount in sample is calculated, so as to draw adsorbed content of formaldehyde.(test methods and procedures are according to GB/T The measure acetylacetone,2,4-pentanedione spectrophotography of 15516-1995 air quality formaldehyde)
The formaldehyde absorbing amount (24 hours) of the activated carbon of 1 Different Weight of table
1g powder body formaldehyde absorbing amount (μ g) 2g powder body formaldehyde absorbing amount (μ g)
Embodiment 1 0.31 0.55
Embodiment 2 0.33 0.58
Embodiment 3 0.42 0.78
Embodiment 4 0.45 0.82
Embodiment 5 0.55 0.92
Comparative example 1 0.11 0.20
Comparative example 2 0.15 0.26
Comparative example 3 0.10 0.18
Limestone original powder 0.03 0.03
Formaldehyde absorption test is carried out as can be seen that adopting identical by embodiment 1-5 and comparative example 1-3 and limestone Under test condition, the effect of modified modified environment-friendly absorbed formaldehyde is substantially better than limestone original powder, it is seen that modified to stone The performance of lime stone formaldehyde adsorption brings larger lifting;Other dosage of surfactant, species and formaldehyde catching agent consumption, kind Class also has considerable influence to the modified of limestone.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, Er Qie In the case of spirit or essential attributes without departing substantially from the present invention, the present invention can be realized in other specific forms.Therefore, no matter From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is by appended power Profit is required rather than described above is limited, it is intended that all in the implication and scope of the equivalency of claim by falling Change is included in the present invention.
Moreover, it will be appreciated that although this specification is been described by according to embodiment, not each embodiment is only wrapped Containing an independent technical scheme, this narrating mode of description is only that those skilled in the art should for clarity Using description as an entirety, the technical scheme in each embodiment can also Jing it is appropriately combined, form those skilled in the art Understandable other embodiment.

Claims (5)

1. a kind of modified environment-friendly material, it is characterised in that be made up of the following raw material according to weight portion:Limestone 35-45 parts, carbon Sour zirconium 11-19 parts, Rhizoma amorphophalli glucomannan 8-16 parts, lecithin 1-5 parts.
2. modified environment-friendly material according to claim 1, it is characterised in that be made up of the following raw material according to weight portion: Limestone 38-42 parts, zirconium carbonate 13-17 parts, Rhizoma amorphophalli glucomannan 10-14 parts, lecithin 2-4 parts.
3. modified environment-friendly material according to claim 1, it is characterised in that be made up of the following raw material according to weight portion: 40 parts of limestone, 15 parts of zirconium carbonate, 12 parts of Rhizoma amorphophalli glucomannan, 3 parts of lecithin.
4. a kind of preparation method of the modified environment-friendly material as described in claim 1-3 is arbitrary, it is characterised in that by following steps Composition:
1) deionized water of 8.2 times of zirconium carbonate and its quality is mixed, carbonic acid zirconium solution is obtained;
2) by limestone and Rhizoma amorphophalli glucomannan mixed grinding, carbonic acid zirconium solution is added, is heated to 85 DEG C and close at such a temperature Envelope stir process 68min, is subsequently adding lecithin, is warming up to 92 DEG C and stir process 38min at such a temperature, is then down to 58 DEG C and supersound process 56min at such a temperature, ultrasonic power is 900W, then is stirred at a temperature of 103-105 DEG C to dry, then 2.8h is calcined in 400 DEG C of Muffle furnace and obtains final product modified environment-friendly material.
5. application of the modified environment-friendly material as described in claim 1-3 is arbitrary in formaldehyde treated.
CN201611246986.6A 2016-12-29 2016-12-29 Modified environmental protection material and preparation method thereof Pending CN106607010A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201611246986.6A CN106607010A (en) 2016-12-29 2016-12-29 Modified environmental protection material and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201611246986.6A CN106607010A (en) 2016-12-29 2016-12-29 Modified environmental protection material and preparation method thereof

Publications (1)

Publication Number Publication Date
CN106607010A true CN106607010A (en) 2017-05-03

Family

ID=58636315

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201611246986.6A Pending CN106607010A (en) 2016-12-29 2016-12-29 Modified environmental protection material and preparation method thereof

Country Status (1)

Country Link
CN (1) CN106607010A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113603382A (en) * 2021-09-17 2021-11-05 重庆从心科技有限公司 Modified limestone powder for manufacturing concrete

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113603382A (en) * 2021-09-17 2021-11-05 重庆从心科技有限公司 Modified limestone powder for manufacturing concrete

Similar Documents

Publication Publication Date Title
WO2016041380A1 (en) Supported catalyst suitable for purifying air at normal temperature
CN104437075A (en) Method for carrying out catalytic pyrolysis treatment on volatile organic gas by utilizing microwave heating
CN105984871A (en) Method for preparing modified activated carbon from coffee residues
CN104399434A (en) Cerium oxide-containing PM2.5 adsorbent and preparation method thereof
CN106582573A (en) Formaldehyde adsorption material
CN109569291A (en) A kind of purification medicament such as indoor harmful gas such as formaldehyde, benzene and its construction Processing tecchnics
CN103586011B (en) Sintering-free forming and coating method of MIL-101 material with ultrahigh specific surface area
CN103977755A (en) Air purifying material with high catalytic oxidation activity
CN105688660A (en) Air purification material taking titanium dioxide photocatalyst as base material and preparation method thereof
CN103977762A (en) A modification method of active carbon fiber capable of efficiently removing air pollutants
CN106939140A (en) Photocatalyst spray its preparation method
CN104368318A (en) PM2.5 adsorbent and preparation method thereof
CN106732426A (en) A kind of modified pyrophillite
CN106607010A (en) Modified environmental protection material and preparation method thereof
CN104353425B (en) A kind of flyash of energy formaldehyde adsorption and preparation method thereof
CN106512960A (en) Modified environment-friendly material as well as preparing method and application thereof
CN103706244A (en) Indoor air purifying agent
CN106622110A (en) Modified material
CN106732417A (en) It is a kind of material modified and its preparation method and application
CN104069799A (en) Formaldehyde adsorbent capable of modifying coal cinder through acid
CN106582536A (en) Modified illite as well as preparation method and application thereof
CN106693879A (en) Modified limestone and preparation method thereof
CN104383894A (en) Filtering material with high adsorptivity for gauze mask and preparation method thereof
CN106732392A (en) A kind of modified grammite and its preparation method and application
CN114471488A (en) Preparation method and application of modified activated carbon with ultrahigh formaldehyde adsorption capacity

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20170503

WD01 Invention patent application deemed withdrawn after publication