CN106139816B - A kind of application of low viscosity algin - Google Patents
A kind of application of low viscosity algin Download PDFInfo
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- CN106139816B CN106139816B CN201610575189.6A CN201610575189A CN106139816B CN 106139816 B CN106139816 B CN 106139816B CN 201610575189 A CN201610575189 A CN 201610575189A CN 106139816 B CN106139816 B CN 106139816B
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D53/02—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 by adsorption, e.g. preparative gas chromatography
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- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
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- 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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Abstract
The present invention provides a kind of application of low viscosity algin in methyl aldehyde adsorption material.The low viscosity algin has the activity of formaldehyde adsorption, and the application of the low viscosity algin, which refers to, is preparing the application in methyl aldehyde adsorption material with the active low viscosity algin of formaldehyde adsorption.Present invention firstly discovers that low viscosity algin PARA FORMALDEHYDE PRILLS(91,95) has significant suction-operated, and disclose the method that low viscosity algin and a certain amount of diatomite and/or active carbon are mixed with methyl aldehyde adsorption material, adsorbent material made from this method is at low cost, physical stability is good, PARA FORMALDEHYDE PRILLS(91,95) adsorption effect is significant, secondary pollution will not be caused to environment, can be widely applied to indoor or public place formaldehyde gas pollutant removal.
Description
Technical field
The present invention relates to Techniques for Indoor Air Purification fields, and in particular to a kind of low viscosity with formaldehyde adsorption property is brown
The application of phycocolloid.
Background technique
Formaldehyde is the main component in indoor volatile organic compound, and the time of the mankind at least 70% or more is indoors
Tide over, and the time that urban population is spent indoors has been more than 90%, especially infant and the old and the weak handicapped person indoors when
Between it is longer.Formaldehyde is irritative gas colourless, with overpowering odor, and 35% ~ 40% aqueous solution is generally called formalin.First
Aldehyde is protein coagulating agent, belongs to protoplasmic poison class, can cause the local skin even allergic reaction of whole body in conjunction with protein.People
The individual difference of PARA FORMALDEHYDE PRILLS(91,95) impression is larger, and eyes are most sensitive, and smell and respiratory tract (upper respiratory tract mucous membrane) stimulation are taken second place, followed by
Skin.Due to having used urea formaldehyde resin adhesive in various artificial boards (particieboard, density board, fiberboard, glued board etc.), because
And formaldehyde can be contained.In addition, certain chemical fibre carpets, paint also contain a certain amount of formaldehyde.Long-term sucking contains a large amount of first
The air of aldehyde pollution causes high risks to human health.
In recent years, China's Formaldehyde Pollution of Indoor Air is serious, but air cleaning popularity rate is extremely low, and the chemistry including ionic catalysis is anti-
It answers, the air purifying process existing research of common improvement Formaldehyde Pollution of Indoor Air including physical adsorption techniques etc., but can generally grasp
The property made is poor, at high cost；All kinds of formaldehyde eliminating agents also occur on the market, but secondary pollution is serious, and whole utilization situation is poor.
Currently, the research and development of formaldehyde gas scavenging material it is main or researched and developed from the approach of absorption some scavenging materials and with it is some other
Purification techniques combines.The active carbon adsorption cleaning material traditional as one, is still the main force of current formaldehyde gas scavenging material
Army.But simple activated carbon adsorption efficiency is lower, numerous studies are concentrated mainly on the study on the modification of more active carbons at present, change
Active carbon after property can greatly improve the absorption property of PARA FORMALDEHYDE PRILLS(91,95), but cost also considerably increases.To kieselguhr adsorption first
The research of aldehyde common are harmful substance it has been reported that diatomite itself is free of formaldehyde, benzene etc., but glue can be also added in diatom ooze
Condensate matter, if being added to organic cementitious material, quality is not good enough, it is also possible to containing organic volatile, there is absorption effect
The low disadvantage of rate.
Algin is a kind of to be prevalent in the intracorporal chain being formed by connecting by guluronic acid and mannuronic acid of brown alga
Shape natural polymer heteroglycan.The molecule of algin is comprising D- mannopyranose aldehydic acid unit and L- pyrans guluronic acid list
The copolymer of member, this two big structures units alternately form the chain molecule of this polysaccharide with 1 → 4 glycosidic bond.Algin is one
Kind polyhydroxy large aperture molecule, PARA FORMALDEHYDE PRILLS(91,95) have significant suction-operated, and the existing chemisorption of adsorption mechanism has physical absorption again.
The aqueous solution of algin has certain viscosity, and the viscosity of alginate solution steeply rises, general feelings with the increase of concentration
Under condition, concentration is every to increase by 0.5%, and viscosity is then increased with 2.5~3.0 times of ratio, is in typical hydrophily colloid characteristic；When dense
When degree is more than 1%, viscosity is steeply risen.For the use in practice, the viscosity of alginate solution is very important.Work as algin
When as increasing original text agent, generally requiring its viscosity to be the bigger the better, there can be higher viscosity in low concentration in this way.But
When algin is used for methyl aldehyde adsorption material, the too big exposure that will be unfavorable for hydroxyl in brown alga xanthan molecule of viscosity influences formaldehyde
Absorption property.
Therefore, in order to realize the purpose of more efficient formaldehyde adsorption, the present invention is using diatomite and active carbon as carrier, addition one
The algin of quantitative low viscosity prepares methyl aldehyde adsorption material as adhesive.The material absorption property is good, and adsorption rate is fast,
It is at low cost, it is without secondary pollution, it is expected to become environmentally protective indoor formaldehyde adsorbent material.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of low viscosity algin material with formaldehyde adsorption property
Preparation method.
To achieve the above object, the technical solution adopted by the present invention is that: a kind of application of low viscosity algin, it is described low viscous
The activity that algin has formaldehyde adsorption is spent, the application of the low viscosity algin refers to the active low viscosity of formaldehyde adsorption
Algin is preparing the application in methyl aldehyde adsorption material.
Wherein, the range of viscosities of the low viscosity algin is 5 ~ 500 mPa.s (centipoise), and viscosimetric analysis condition is
Low viscosity algin is made into 1% solution of mass concentration, and 20-25 DEG C of test temperature.
Wherein, the low viscosity algin PARA FORMALDEHYDE PRILLS(91,95) has significant adsorption effect.
Wherein, the low viscosity algin can be mixed with traditional methyl aldehyde adsorption material diatomite and/or active carbon,
Increase the adsorption effect of traditional formaldehyde adsorption material.
Wherein, the methyl aldehyde adsorption material is made of the raw material of following weight percent: low viscosity algin 0.5-20%；
Active carbon 0-80%；Diatomite 0-80%；Calcium chloride 0.1-3%, preferred weight ratio are low viscosity algin 10%；Active carbon 80%；
Diatomite 8%；Calcium chloride 2%；
Or the methyl aldehyde adsorption material is made of weight ratio are as follows: low viscosity algin 80-99%: calcium chloride 20-1%;It is excellent
Selecting weight ratio is low viscosity algin 95%: calcium chloride 5%.
Wherein, the preparation method of the low viscosity algin material with formaldehyde adsorption property of the invention includes following
Step:
(1) 0.5-20 g low viscosity algin sample is weighed, is made into 1-10% solution with deionized water.
(2) a certain amount of diatomite and/or active carbon stirring are added into solution, makes the quality hundred of diatomite or active carbon
Divide ratio to reach 0-80%, while the calcium chloride solution of 1-10% is added dropwise.
It (3) is to obtain the adsorbent material of energy absorbing formaldehyde gas after drying, crushing.
Wherein, the application of the low viscosity algin, the low viscosity algin derive from Phaeophyta Laminariales and ink
Angle Cutleriales seaweed.
The invention discloses the low viscosity algins to have significant formaldehyde absorbing activity by formaldehyde absorbing measuring.
Above-mentioned formaldehyde absorbing experimental method is: measuring 1 g sample in spare ml headspace bottle, 800 are packed into ml headspace bottle
Mg/L formalin, and a bracket using the production of 5 mL liquid transfer gun heads is placed in ml headspace bottle, in order to allow sample
Then the ml headspace bottle of loading sample is put into thermostat water bath by not Formaldehyde Exposed solution, and 50 DEG C of temperature setting, so that formaldehyde can
Sufficiently volatilization takes out the ml headspace bottle in thermostat water bath after a certain period of time, after cooling 30min, opens ml headspace bottle and takes 1 mL remaining
Reaction solution utilizes the content of formaldehyde in surplus solution in spectrophotometric determination ml headspace bottle in test tube.
The measuring method of above-mentioned formaldehyde is: ACAC. colorimetric method
(1) drafting of standard curve
1. formaldehyde standard solution is prepared: taking 37% formalin, 1.9 mL to be diluted to 500 mL, 1 mol/L sulfurous acid is added
The drop thymolphthalein of 2.5 mL of sodium and 2, it is colourless for being neutralized to solution with 0.01 mol/L standard sulfuric acid and taken off；5 mL are then added to have matched
Good formalin, is titrated to light blue decoloration with sulfuric acid standard solution, which is diluted 125 times, as standard is molten
Liquid.
2. standard coloration agent is prepared: the ammonium acetate of 150 g is dissolved in 500 mL pure water, is then transferred to 1000 mL capacity
In bottle, then 2 mL of acetylacetone,2,4-pentanedione of 99.5% glacial acetic acid 3 mL and 99% is added, with deionized water constant volume and is stored in brown bottle
In spare, as color developing agent.
(2) it measures: taking the formalin that 40.5 μ L mass fractions are 37% and be settled to 100 mL, as 150 μ g/mL
Formalin.It takes 0,50,100,150,200,250,300 μ L in test tube respectively, adds water to 5 mL.Then 5 mL are added
By prepared acetylacetone,2,4-pentanedione solution is provided, shakes up, be placed in 58 DEG C of water-baths and heat 6 min, taking-up is cooled to room temperature, 412
Absorbance is measured at nm.Under the premise of excluding blank assay absorbance, it is bent that standard is drawn with the corresponding content of formaldehyde of absorbance
Line.
The present invention adds a certain amount of algin as adhesive, for the first time using low using diatomite and active carbon as carrier
Viscosity algin prepares methyl aldehyde adsorption material.The material absorption property is good, and adsorption rate is fast, at low cost, without secondary pollution, is expected to
As environmentally protective indoor formaldehyde adsorbent material.
Detailed description of the invention
The adsorptivity ability of the algin PARA FORMALDEHYDE PRILLS(91,95) (800 mg/L) of Fig. 1 different viscosities measures.
Fig. 2 difference adsorbent material measures the adsorption capacity of the formaldehyde of various concentration.
The adsorbance of Fig. 3 difference adsorbent material PARA FORMALDEHYDE PRILLS(91,95) (800 mg/L) changes with time situation.
Specific embodiment
Present invention will be further explained below with reference to specific examples.It should be understood that these embodiments are merely to illustrate the present invention
Rather than it limits the scope of the invention.In addition, it should also be understood that, after reading the contents of the present invention, those skilled in the art can
To make various changes or modifications to the present invention, such equivalent forms equally fall within limited range of the present invention.
Embodiment 1: the test of the algin PARA FORMALDEHYDE PRILLS(91,95) absorption property of different viscosities
The test of the absorption property of the algin sample PARA FORMALDEHYDE PRILLS(91,95) of different viscosities includes the following steps:
(1) prepare viscosity be 2000 mPa.s (centipoise) 1%(mass concentration, similarly hereinafter) 200 mL of alginate solution,
Be added dropwise 5%(mass concentration, similarly hereinafter) 20 mL of calcium chloride solution.Drying obtains algin 1 after crushing；
(2) prepare viscosity be 1500 mPa.s (centipoise) 1% 200 mL of alginate solution, be added dropwise 5% calcium chloride it is molten
20 mL of liquid.Drying obtains algin 2 after crushing；
(3) prepare viscosity be 1000 mPa.s (centipoise) 1% 200 mL of alginate solution, be added dropwise 5% calcium chloride it is molten
20 mL of liquid.Drying obtains algin 3 after crushing；
(4) prepare viscosity be 500 mPa.s (centipoise) 1% 200 mL of alginate solution, be added dropwise 5% calcium chloride it is molten
20 mL of liquid.Drying obtains algin 4 after crushing；
(5) prepare viscosity be 300 mPa.s (centipoise) 1% 200 mL of alginate solution, be added dropwise 5% calcium chloride it is molten
20 mL of liquid.Drying obtains algin 5 after crushing；
(6) prepare viscosity be 100 mPa.s (centipoise) 1% 200 mL of alginate solution, be added dropwise 5% calcium chloride it is molten
20 mL of liquid.Drying obtains algin 6 after crushing；
(7) 1% 200 mL of alginate solution that viscosity is 50 mPa.s (centipoise) is prepared, 5% calcium chloride solution is added dropwise
20 mL.Drying obtains algin 7 after crushing；
(8) 1% 200 mL of alginate solution that viscosity is 5 mPa.s (centipoise) is prepared, 5% calcium chloride solution is added dropwise
20 mL.Drying obtains algin 8 after crushing；
(9) 1% 200 mL of alginate solution that viscosity is 1 mPa.s (centipoise) is prepared, 5% calcium chloride solution is added dropwise
20 mL.Drying obtains algin 9 after crushing；
(10) commercially available active carbon and diatomite are control sample；
(11) above-mentioned 9 algin samples and reference substance formaldehyde adsorption property are studied
Test method: measuring 1 g sample in spare ml headspace bottle, and it is that 800 mg/L formaldehyde are molten that concentration is packed into ml headspace bottle
Liquid, and a bracket using the production of 5 mL liquid transfer gun heads is placed in ml headspace bottle, in order to allow sample not Formaldehyde Exposed
Then the ml headspace bottle of loading sample is put into thermostat water bath by solution, and 50 DEG C of temperature setting, so that formaldehyde can sufficiently volatilize,
After 24 h, the ml headspace bottle in thermostat water bath is taken out, after cooling down 30 min, ml headspace bottle is opened and takes 1 mL residual reaction liquid in test tube
In, utilize the content of formaldehyde in surplus solution in spectrophotometric determination ml headspace bottle.
The measuring method of above-mentioned formaldehyde is: ACAC. colorimetric method
(1) drafting of standard curve
1. formaldehyde standard solution is prepared: taking 37%(mass concentration, similarly hereinafter) formalin 1.9mL is diluted to 500mL, it is added 1
The drop thymolphthalein of 2.5 mL of mol/L sodium sulfite and 2, it is colourless for being neutralized to solution with 0.01 mol/L standard sulfuric acid and taken off；Then
The formalin that 5 mL have been prepared is added, is titrated to light blue decoloration with sulfuric acid standard solution, which is diluted 125
Times, as standard solution.
2. standard coloration agent is prepared: the ammonium acetate of 150 g is dissolved in 500 mL pure water, is then transferred to 1000 mL capacity
In bottle, then add 99.5%(mass concentration, similarly hereinafter) 3 mL and 99%(mass concentration of glacial acetic acid, similarly hereinafter) acetylacetone,2,4-pentanedione 2
ML with deionized water constant volume and is stored in spare in brown bottle, as color developing agent.
(2) it measures: taking the formalin that 40.5 μ L mass fractions are 37% and be settled to 100 mL, as 150 μ g/mL
Formalin.It takes 0,50,100,150,200,250,300 μ L in test tube respectively, adds water to 5 mL.Then 5 mL are added
By prepared acetylacetone,2,4-pentanedione solution is provided, shakes up, be placed in 58 DEG C of water-baths and heat 6 min, taking-up is cooled to room temperature, 412
Absorbance is measured at nm.Under the premise of excluding blank assay absorbance, it is bent that standard is drawn with the corresponding content of formaldehyde of absorbance
Line.
As a result: to measurement experiment result such as Fig. 1 of different viscosities algin formaldehyde absorbing experiment formaldehyde adsorption property: for 24 hours
Afterwards, the algin PARA FORMALDEHYDE PRILLS(91,95) of different viscosities has certain suction-operated, still, the adsorption capacity of PARA FORMALDEHYDE PRILLS(91,95) with viscosity drop
Low and increase, it is 63.4 mg/g, adsorption energy that when brown alga adhesiveness is 300 mPa.s, the adsorption capacity of PARA FORMALDEHYDE PRILLS(91,95) is maximum
Power is better than commercially available active carbon and diatomite, and with the reduction of viscosity, the adsorption capacity of PARA FORMALDEHYDE PRILLS(91,95) maintains 55 mg/g, when
Brown alga adhesiveness is when falling to 1 mPa.s, and the adsorption capacity of PARA FORMALDEHYDE PRILLS(91,95) is only 10.22 mg/g, from our experimental result
It is found that the viscosity that PARA FORMALDEHYDE PRILLS(91,95) has the algin of preferable absorption property is 5-350 mPa.s.Compare algin sample and reference substance,
We can see that the absorption property of 5-500 mPa.s viscosity algin PARA FORMALDEHYDE PRILLS(91,95) is better than active carbon, diatomite and commercially available diatom
Mud, this illustrates that low viscosity algin can be used for preparing methyl aldehyde adsorption material.
Embodiment 2: the preparation of methyl aldehyde adsorption material 1
A kind of methyl aldehyde adsorption material is made of following weight percent raw material:
Low viscosity algin: 5%；
Diatomite: 74%；
Active carbon: 20%；
Calcium chloride: 1%；
The methyl aldehyde adsorption material preparation method includes the following steps:
(1) 2.5%(mass concentration is prepared, similarly hereinafter) 200 mL of low viscosity algin solution.
(2) 74 g diatomite and the stirring of 20 g active carbons are added into solution, while 10%(mass concentration is added dropwise, similarly hereinafter)
10 mL of calcium chloride solution.
(3) 100 DEG C of drying, the adsorbent material 1 that energy absorbing formaldehyde gas is obtained after crushing.
Embodiment 3: the preparation of methyl aldehyde adsorption material 2
A kind of methyl aldehyde adsorption material is made of following weight percent raw material:
Low viscosity algin: 1%；
Active carbon: 5%；
Diatomite: 93%；
Calcium chloride: 1%；
The methyl aldehyde adsorption material preparation method includes the following steps:
(1) 0.5% low viscosity algin solution, 200 mL is prepared.
(2) 93 diatomite and the stirring of 5 g active carbons are added into solution, while 5% acid chlorization calcium solution 20 is added dropwise
mL。
It (3) is to obtain the adsorbent material 2 of energy absorbing formaldehyde gas after drying, crushing.
Embodiment 4: the preparation of methyl aldehyde adsorption material 3
A kind of methyl aldehyde adsorption material is made of following weight percent raw material:
Low viscosity algin: 10%；
Active carbon: 80%；
Diatomite: 8%；
Calcium chloride: 2%；
The methyl aldehyde adsorption material preparation method includes the following steps:
(1) 5% low viscosity algin solution, 200 mL is prepared.
(2) 8 g diatomite and the stirring of 80 g active carbons are added into solution, while 10% acid chlorization calcium solution is added dropwise
20 mL。
It (3) is to obtain the adsorbent material 3 of energy absorbing formaldehyde gas after drying, crushing.
Embodiment 5: the preparation of methyl aldehyde adsorption material 4
A kind of methyl aldehyde adsorption material is made of following weight percent raw material:
Low viscosity algin: 3%；
Active carbon: 48%；
Diatomite: 48%；
Calcium chloride: 1%；
The methyl aldehyde adsorption material preparation method includes the following steps:
(1) 1.5% low viscosity algin solution, 200 mL is prepared.
(2) 48 g diatomite and the stirring of 48 g active carbons are added into solution, while 10% acid chlorization calcium solution is added dropwise
10 mL。
It (3) is to obtain the adsorbent material 4 of energy absorbing formaldehyde gas after drying, crushing.
Embodiment 6: survey of the 4 kinds of methyl aldehyde adsorption materials prepared in embodiment 2-5 to the absorption property of various concentration formaldehyde
It is fixed
This test is by material to the absorption property of the formaldehyde of various concentration come the big of response sample PARA FORMALDEHYDE PRILLS(91,95) adsorption capacity
It is small, illustrate application of the low viscosity algin in terms of methyl aldehyde adsorption material.Test sample: the 4 kinds of formaldehyde prepared in embodiment 2-5
Adsorbent material
Test method: 1 g sample is measured in spare ml headspace bottle, certain density formalin is packed into ml headspace bottle
(50,200,400,800 mg/L), and a bracket using the production of 5 mL liquid transfer gun heads is placed in ml headspace bottle, it is therefore an objective to it is
It allows sample not Formaldehyde Exposed solution, the ml headspace bottle of loading sample is then put into thermostat water bath, 50 DEG C of temperature setting, so that
Formaldehyde can sufficiently volatilize, and after 24 h, take out the ml headspace bottle in thermostat water bath, cooling after a certain period of time, opens ml headspace bottle and takes 1
ML residual reaction liquid utilizes the content of formaldehyde in surplus solution in spectrophotometric determination ml headspace bottle in test tube.
The measuring method of above-mentioned formaldehyde is: ACAC. colorimetric method
(1) drafting of standard curve
1. formaldehyde standard solution is prepared: taking 37% formalin, 1.9 mL to be diluted to 500 mL, 1 mol/L sulfurous acid is added
The drop thymolphthalein of 2.5 mL of sodium and 2, it is colourless for being neutralized to solution with 0.01 mol/L standard sulfuric acid and taken off；5 mL are then added to have matched
Good formalin, is titrated to light blue decoloration with sulfuric acid standard solution, which is diluted 125 times, as standard is molten
Liquid.
2. standard coloration agent is prepared: the ammonium acetate of 150 g is dissolved in 500 mL pure water, is then transferred to 1000 mL capacity
In bottle, then 2 mL of acetylacetone,2,4-pentanedione of 99.5% glacial acetic acid 3 mL and 99% is added, with deionized water constant volume and is stored in brown bottle
In spare, as color developing agent.
(2) it measures: taking the formalin that 40.5 μ L mass fractions are 37% and be settled to 100 mL, as 150 μ g/mL
Formalin.It takes 0,50,100,150,200,250,300 μ L in test tube respectively, adds water to 5 mL.Then 5 mL are added
By prepared acetylacetone,2,4-pentanedione solution is provided, shakes up, be placed in 58 DEG C of water-baths and heat 6 min, taking-up is cooled to room temperature, 412
Absorbance is measured at nm.Under the premise of excluding blank assay absorbance, it is bent that standard is drawn with the corresponding content of formaldehyde of absorbance
Line.
As a result: to measurement experiment result such as Fig. 2 of the adsorption experiment formaldehyde adsorption property of various concentration formaldehyde: when formaldehyde is molten
When the concentration of liquid is 40 mg/L, each adsorbent material PARA FORMALDEHYDE PRILLS(91,95) has certain suction-operated, with the raising of concentration of formaldehyde, inhales
Attached amount also gradually increases, and when concentration of formaldehyde is 400 mg/L, the adsorbance of each adsorbent material PARA FORMALDEHYDE PRILLS(91,95) is dramatically increased, but works as first
When aldehyde concentration continues to increase to 800 mg/L, the adsorbance of sample PARA FORMALDEHYDE PRILLS(91,95) increases slow, wherein 3 absorption property of adsorbent material
It is best.The absorption property of adsorbent material 1-4 is better than commercially available diatom ooze.Compare adsorbent material 1-4 we can see that adsorption material
The low viscosity algin that contains is most in material 3, this illustrate the addition of low viscosity algin can effectively improve by diatomite and
The absorption property of the methyl aldehyde adsorption material PARA FORMALDEHYDE PRILLS(91,95) of active carbon preparation.
Embodiment 7: the absorption property of the 4 kinds of methyl aldehyde adsorption material PARA FORMALDEHYDE PRILLS(91,95)s prepared in embodiment 2-5 changes with time
Trend study
This test changes with time trend by the absorption property of material PARA FORMALDEHYDE PRILLS(91,95) to react adsorbent material PARA FORMALDEHYDE PRILLS(91,95)
Adsorption capacity illustrates application of the low viscosity algin in terms of methyl aldehyde adsorption material.
Test sample: the 4 kinds of methyl aldehyde adsorption materials prepared in embodiment 2-5
Test method: 1 g sample is measured in spare ml headspace bottle, certain density 800 mg/L first is packed into ml headspace bottle
Aldehyde solution, and a bracket using the production of 5 mL liquid transfer gun heads is placed in ml headspace bottle, in order to allow sample not contact
Then the ml headspace bottle of loading sample is put into thermostat water bath by formalin, and 50 DEG C of temperature setting, so that formaldehyde can be waved sufficiently
Hair, and after a certain period of time (1h, 2h, 4h, 8h, 12h, for 24 hours, 48h), take out the ml headspace bottle in thermostat water bath, cooling certain time
Afterwards, opening ml headspace bottle takes 1 mL residual reaction liquid in test tube, using in surplus solution in spectrophotometric determination ml headspace bottle
Content of formaldehyde.
The measuring method of above-mentioned formaldehyde is: ACAC. colorimetric method
(1) drafting of standard curve
1. formaldehyde standard solution is prepared: taking 37% formalin, 1.9 mL to be diluted to 500 mL, it is sub- that 1 mol/L is added
The drop thymolphthalein of 2.5 mL of sodium sulphate and 2, it is colourless for being neutralized to solution with 0.01 mol/L standard sulfuric acid and taken off；5 mL are then added
The formalin prepared is titrated to light blue decoloration with sulfuric acid standard solution, which is diluted 125 times, is as marked
Quasi- solution.
2. standard coloration agent is prepared: the ammonium acetate of 150 g is dissolved in 500 mL pure water, is then transferred to 1000 mL capacity
In bottle, then 2 mL of acetylacetone,2,4-pentanedione of 99.5% glacial acetic acid 3 mL and 99% is added, with deionized water constant volume and is stored in brown bottle
In spare, as color developing agent.
(2) it measures: taking the formalin that 40.5 μ L mass fractions are 37% and be settled to 100 mL, as 150 μ g/mL
Formalin.It takes 0,50,100,150,200,250,300 μ L in test tube respectively, adds water to 5 mL.Then 5 mL are added
By prepared acetylacetone,2,4-pentanedione solution is provided, shakes up, be placed in 58 DEG C of water-baths and heat 6 min, taking-up is cooled to room temperature, 412
Absorbance is measured at nm.Under the premise of excluding blank assay absorbance, it is bent that standard is drawn with the corresponding content of formaldehyde of absorbance
Line.
As a result: the absorption property of the 4 kinds of methyl aldehyde adsorption material PARA FORMALDEHYDE PRILLS(91,95)s prepared in embodiment 2-5 changes with time trend
As shown in Figure 3, it is known that the increase at any time of the absorption property of adsorbent material 1-4 PARA FORMALDEHYDE PRILLS(91,95) and increase, absorption property is better than city
Sell diatom ooze.First 12 hours, the increase of each adsorbent material formaldehyde absorbing amount at any time dramatically increased, after 12 h, each adsorbent material
The increase growth trend of formaldehyde absorbing amount at any time is gradually gentle, and substantially each adsorbent material is reaching saturation absorption for 24 hours.
It is to evaluate a kind of suction to the measurement of various concentration formaldehyde absorbing ability and the formaldehyde absorbing ability trend of changing with time
The common method of enclosure material quality.There is suction to the formaldehyde of high-concentration and low-concentration by the adsorbent material that we prepare known to test result
Attached effect, adsorbance increase increase with time, and preceding 12h adsorbance increases rapidly, this illustrates our adsorbent material PARA FORMALDEHYDE PRILLS(91,95)
Adsorption rate is very fast, can quickly remove formaldehyde.
Adsorbent material produced by the present invention is at low cost, physical stability is good, PARA FORMALDEHYDE PRILLS(91,95) adsorption effect is significant, will not be to ring
Secondary pollution is caused in border, can be widely applied to indoor or public place formaldehyde gas pollutant removal.
The above are the descriptions to the embodiment of the present invention to keep this field special by the foregoing description of the disclosed embodiments
Industry technical staff can be realized or using the present invention.Various modifications to these embodiments carry out those skilled in the art
Saying will be apparent, and the general principles defined herein can be the case where not departing from the spirit or scope of the present invention
Under, it realizes in other embodiments.Therefore, the present invention will not be limited to the embodiments shown herein, but to accord with
Close the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. a kind of application of low viscosity algin, which is characterized in that the low viscosity algin has the activity of formaldehyde adsorption, institute
The application for stating low viscosity algin refers to inhales as active ingredient for formaldehyde with the active low viscosity algin of formaldehyde adsorption
In enclosure material or preparing the application in methyl aldehyde adsorption material.
2. the application of low viscosity algin according to claim 1, which is characterized in that the viscosity of the low viscosity algin
Range is 5 ~ 500 mPa.s (centipoise).
3. the application of low viscosity algin according to claim 1, which is characterized in that the low viscosity algin can be with
Traditional methyl aldehyde adsorption material diatomite and/or active carbon mixing, increase the adsorption effect of traditional formaldehyde adsorption material.
4. according to claim 1 or the application of 3 low viscosity algins, which is characterized in that the methyl aldehyde adsorption material by with
The raw material of lower weight percent is made: low viscosity algin 0.5-20%；Active carbon 0-80%；Diatomite 0-80%；Calcium chloride 0.1-
3%;
Or the methyl aldehyde adsorption material is made of weight ratio are as follows: low viscosity algin 80-99%: calcium chloride 20-1%.
5. the application of low viscosity algin according to claim 1, which is characterized in that the methyl aldehyde adsorption material preparation method
Include the following steps:
(1) mass concentration 1-10% low viscosity algin solution is prepared；
(2) the desired amount of diatomite and/or active carbon stirring are added into solution, while the desired amount of mass concentration 1- is added dropwise
10% calcium chloride solution；
It (3) is to obtain the adsorbent material of energy absorbing formaldehyde gas after drying, crushing.
6. the according to claim 1, application of 2 or 3 low viscosity algins, it is characterised in that: the low viscosity algin
From one of Phaeophyta Laminariales and Fucales seaweed or two kinds.
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| CN116082534B (en) * | 2022-12-26 | 2024-05-28 | 临沂大学 | Alginic acid derivative, alginic acid derivative ammonium salt/graphene composite material and preparation method and application thereof |
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