CN104209145A - Nanometer spherical porous weak light photocatalyst for degrading formaldehyde, and preparation method and application thereof - Google Patents
Nanometer spherical porous weak light photocatalyst for degrading formaldehyde, and preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a nanometer spherical porous weak light photocatalyst for degrading formaldehyde, and a preparation method and an application thereof. The photocatalyst comprises 0.2-30wt% of a titanium source, 60-99wt% of an alcohol solvent, 0.005-0.01wt% of a hydrolysis inhibitor, 0.005-0.01wt% of metal ion-containing deionized water, 10-40wt% of hydroxy group-containing mediate strong acid, and 1-5wt% of inorganic dispersant-containing deionized water, and the hydroxy group-containing mediate strong acid contains SiO2 crystal seeds; and the photocatalyst is a transparent sol liquid of nanoparticles, the particle size of the transparent sol liquid is 10-30nm, the surface of the photocatalyst is spherical porous distribution, and the specific surface area of the photocatalyst is large, and is above 300m<2>/g averagely. The photocatalyst has the advantages of mild production preparation conditions, small production safety risk, easy realization of batch production, weak light catalytic purification and high stability, and solves the problems of strict preparation conditions, low sunshine utilization rate, low air purifying and degrading efficiency, large base material apparent influence, construction inconvenience and the like of present mature photocatalyst products.
Description
Technical field
The present invention relates to photocatalyst technology field, particularly relate to a kind of nanometer for degradation of formaldehyde spherical porous low light level photocatalyst, preparation method and application thereof.
Background technology
Current environment pollution problem highlights, and especially the large area of haze occurs that the living environment of the mankind is arrived in serious threat, and surrounding air is administered very urgent.Photocatalyst, as a kind of emerging environment-friendly materials of applicable purification of air, obtains studying more and more widely.But prior art mostly is laboratory research and development product, and with ultraviolet light or visible ray for energy excitation source, application aspect is based on water pollutant improvement, the product being actually used in formaldehyde pollutants degraded is almost blank, the main harm of formaldehyde shows as Mucocutaneous spread effect, formaldehyde is when indoor reach finite concentration, people just has sense of discomfort, the concentration of formaldehyde being greater than 0.08m3 can cause furious, eye is itched, throat discomfort or pain, hoarseness, sneeze, uncomfortable in chest, asthma, dermatitis etc., newly-decorated room content of formaldehyde is higher, it is the main inducing of numerous disease, also be the small molecule gas forming haze simultaneously.Therefore, the improvement of Formaldehyde in Environment is very urgent.In addition, existing photocatalyst product is mostly powder and opaque or translucent suspension, not only have influence on base material apparent, and there is preparation condition harshness in current ripe photocatalyst product, sunshine utilization rate is low, purification of air degradation efficiency is low, be unfavorable for manufacturing, store and the problem such as construction is solved.
Patent CN101486867A adopts nano titanium oxide, nanometer titanium phosphate, nano silicon, nanometer anion powder to coordinate other building coating emulsions, defoamer, coupling agent, dispersant and the composition such as thickener, water building coating, for eliminating the air pollution gases such as indoor formaldehyde, TVOC, benzene, ammonia.Whether the materials such as the thickener of the composite use of this method, defoamer and coupling agent, all containing a certain amount of organic principle, cause secondary pollution to be worth discussion to environment, and the occasion be also not suitable for some transparency requirement are high uses.
Patent CN102029168A discloses a kind of preparation method of nano titanyl pyrophosphate photocatalyst.The patented product is white powdery solid, and mainly for the application of organic pollutant wastewater field of purification, the purification applying to air field is still needed and solved the key issue such as load, film forming.
Japanese Unexamined Patent Publication 2004-180195A take titanium tetrachloride as titanium source, prepare the amorphous state titanium phosphate photocatalyst with one-dimentional structure, water white transparency, the degraded for pollutants such as Sulfide in Air, nitrogen oxide and VOC purifies, and also can be used as antibacterial, antibacterial material use.This product requires high to the spray processing that reality uses, and spraying, once there is sagging, very easily forms white opactitas and powder of detached after film forming, affects base material greatly apparent.
Therefore there is following defect in existing ripe photocatalyst product:
Existing nano titanium oxide dispersion shortcoming:
1) catalytic degradation target majority aims at water pollutant, and on-airborne pollution sources;
2) take " passive exposure degraded " pattern, light intensity dependence is large, " having light work, unglazed shut-down ", and low light condition does not almost have degradation effect, and overall clean-up effect is low;
3) production equipment and conditional request harshness, cost is high, and efficiency is low, industrialization difficulty;
4) most through high-sintering process, powdered product form greatly limits its application and scope;
5) load complex forming technology, film forming adhesive force is not high, easy powder of detached, cannot reach the apparent requirement of base material, unavoidably there is organic substance in composition, there is secondary pollution risk.
Summary of the invention
For the weak point existed in above-mentioned technology, the invention provides the high and construction of the preparation of a kind of normal temperature, low light level catalytic purification, stability simply for the nanometer spherical porous low light level photocatalyst of degradation of formaldehyde, preparation method and application thereof.
For achieving the above object, the invention provides a kind of nanometer for degradation of formaldehyde spherical porous low light level photocatalyst, comprise following raw material by weight percentage: strong acid 10%-40% in the deionized water 0.005%-0.01% of titanium source 0.2%-30%, alcohols solvent 60%-99%, hydrolysis inhibitor 0.005%-0.01%, metal ion, hydroxyl, deionized water 1%-5% containing inorganic dispersant, in this hydroxyl in strong acid containing SiO
2crystal seed; This photocatalyst is nano particle vitreosol liquid, and its domain size distribution is between 10-30nm, and surface is the distribution of spherical cellular, the large and average out to 300m of specific area
2/ more than g.
Wherein, this photocatalyst comprises following raw material by weight percentage: strong acid 15%-40% in the deionized water 0.008%-0.01% of titanium source 11%-30%, alcohols solvent 60%-70%, hydrolysis inhibitor 0.008%-0.01%, metal ion, hydroxyl, deionized water 2.5%-5% containing inorganic dispersant.
Wherein, this photocatalyst comprises following raw material by weight percentage: strong acid 21% in the deionized water 0.01% of titanium source 15%, alcohols solvent 60%, hydrolysis inhibitor 0.01%, metal ion, hydroxyl, deionized water 3.98% containing inorganic dispersant.
For achieving the above object, the present invention also provides the preparation method of a kind of nanometer for degradation of formaldehyde spherical porous low light level photocatalyst, it is characterized in that, comprises the following steps:
Step 1, mixes the titanium source of 0.2%-30% with the alcohols solvent of 60%-99%, forms mixed liquor;
Step 2, adds in mixed liquor by the hydrolysis inhibitor of 0.005%-0.01%, carries out forming colloidal sol after violent stirring also synchronously instills the deionized water of the metal ion of 0.005%-0.01% slowly;
Step 3, stops stirring this colloidal sol and ageing forms transparent light blue gel;
Step 4, will containing SiO under normal temperature condition
2in the hydroxyl of the 10%-40% of crystal seed, strong acid adds in gel slowly, and after carrying out dispergation and reaction, obtains clear solution;
Step 5, joins containing in inorganic dispersant deionized water containing 1%-5%, and obtains concentrate after stirring by clear solution;
Step 6, adds alkali lye and carries out pH adjustment in concentrate, and adjustable range between 2-9, and obtains nano particle vitreosol liquid after dilution, and its domain size distribution is between 10-30nm, and surface be that spherical cellular distributes, and specific area greatly and average out to 300m
2/ more than g.
Wherein, described titanium source is any one in tetrabutyl titanate, titanium tetrachloride, titanium trichloride, titanyl sulfate or tetraethyl titanate; In described alcohols solvent, carbon containing quantity 1-4 is individual, and is any one in absolute ethyl alcohol, normal propyl alcohol, isopropyl alcohol, n-butanol, sec-butyl alcohol or isobutanol.
Wherein, the metal ion in the deionized water of described metal ion is any one in bismuth ion, chromium ion, calcium ion, sodium ion, potassium ion.
Wherein, in described hydroxyl, strong acid is any one in oxalic acid, boric acid, dust technology, phosphoric acid, formic acid.
Wherein, described inorganic dispersant is any one in sodium pyrophosphate, calgon, poly-hydroxyl sodium, calcium carbonate, magnesium calcium carbonate; Described hydrolysis inhibitor is any one in ice acid esters, acetylacetone,2,4-pentanedione, concentrated hydrochloric acid, red fuming nitric acid (RFNA).
Wherein, described alkali lye is any one in NaOH, calcium hydroxide, potassium hydroxide, sodium carbonate, sodium acid carbonate, concentrated ammonia liquor.
For achieving the above object, the present invention also provides the application of a kind of nanometer spherical porous low light level photocatalyst, the application of the nanometer obtained by above-mentioned preparation method spherical porous low light level photocatalyst in degradation of formaldehyde.
Compared with prior art, the nanometer for degradation of formaldehyde provided by the invention spherical porous low light level photocatalyst, preparation method and application thereof, the present invention has following beneficial effect:
1) photocatalyst of the present invention is nano particle vitreosol liquid, long term storage can not produce precipitation, convenient construction, and film forming adhesive force is good, become film hardness high, can not powder of detached, water white transparency, can keep the apparent true qualities of base material, be adapted at all kinds of substrate surface construction operation, the scope of application expands;
2) surface of this photocatalyst is the distribution of spherical cellular, large and more than the average out to 300m2/g of specific area, this photocatalyst is made to have large average specific surface area, due to strong adsorption effect, pollute the formation of thing local concentration gradients, accelerate the contact frequency of photocatalyst and pollutant, realize the active purification of material; And great specific area, change " passive exposure degraded " pattern of traditional photocatalyst, adopt " initiatively+passive " two kinds of working methods that pattern combines, realize round-the-clock purification and degrade, raising efficiency;
3) in this component be full inorganic nano component, environmental friendliness, non-secondary pollution, can degrade to the formaldehyde in air in time, and degradation rate become large along with the increase of this photocatalyst concentration;
4) with colloidal sol, gel carry out dispergation, dilution technique for synthesis main points with strong acid in hydroxyl, ordinary temperature production and the directly application of product is realized;
5) in manufacture craft, adopt the deionized water of metal ion, achieve mixing of metal ion, natural visible ray utilization rate promotes, successful of degrading under low light condition;
6) in preparation method can according to occasion need select concentration and pH value, achieve acid-base value and pH value is adjustable, the restriction of use occasion can be broken away from;
7) this photocatalyst manufacture mild condition, production safety risk little, easily realize volume production, low light level catalytic purification, stability are high, the problems such as emphasis is harsh for current ripe photocatalyst product preparation condition, sunshine utilization rate is low, purification of air degradation efficiency is low, base material apparent effect large, construction inconvenience are solved.
Accompanying drawing explanation
Fig. 1 is the flow chart of the preparation method of the nanometer for degradation of formaldehyde of the present invention spherical porous low light level photocatalyst.;
Fig. 2 is the curve map of the concentration degraded of formaldehyde in experimental example one;
Fig. 3 is the curve map of the concentration degraded of formaldehyde in experimental example two;
Fig. 4 is the curve map of the concentration degraded of formaldehyde in experimental example three.
Detailed description of the invention
In order to more clearly state the present invention, below in conjunction with accompanying drawing, the present invention is further described.
Nanometer for degradation of formaldehyde of the present invention spherical porous low light level photocatalyst, comprise following raw material by weight percentage: strong acid 10%-40% in the deionized water 0.005%-0.01% of titanium source 0.2%-30%, alcohols solvent 60%-99%, hydrolysis inhibitor 0.005%-0.01%, metal ion, hydroxyl, deionized water 1%-5% containing inorganic dispersant, in this hydroxyl in strong acid containing SiO
2crystal seed; This photocatalyst is nano particle vitreosol liquid, and its domain size distribution is between 10-30nm, and surface is the distribution of spherical cellular, the large and average out to 300m of specific area
2/ more than g.
In the present embodiment, this photocatalyst comprises following raw material by weight percentage: strong acid 15%-40% in the deionized water 0.008%-0.01% of titanium source 11%-30%, alcohols solvent 60%-70%, hydrolysis inhibitor 0.008%-0.01%, metal ion, hydroxyl, deionized water 2.5%-5% containing inorganic dispersant.The percentage by weight of this photocatalyst the best is counted: strong acid 21% in the deionized water 0.01% of titanium source 15%, alcohols solvent 60%, hydrolysis inhibitor 0.01%, metal ion, hydroxyl, deionized water 3.98% containing inorganic dispersant.
Compared to the situation of prior art, the nanometer for degradation of formaldehyde provided by the invention spherical porous low light level photocatalyst, has following advantage:
1) photocatalyst of the present invention is nano particle vitreosol liquid, long term storage can not produce precipitation, convenient construction, and film forming adhesive force is good, become film hardness high, can not powder of detached, water white transparency, can keep the apparent true qualities of base material, be adapted at all kinds of substrate surface construction operation, the scope of application expands;
2) surface of this photocatalyst is the distribution of spherical cellular, large and more than the average out to 300m2/g of specific area, this photocatalyst is made to have large average specific surface area, due to strong adsorption effect, pollute the formation of thing local concentration gradients, accelerate the contact frequency of photocatalyst and pollutant, realize the active purification of material; And great specific area, change " passive exposure degraded " pattern of traditional photocatalyst, adopt " initiatively+passive " two kinds of working methods that pattern combines, realize round-the-clock purification and degrade, raising efficiency;
3) in this component be full inorganic nano component, environmental friendliness, non-secondary pollution, can degrade to the formaldehyde in air in time, and degradation rate become large along with the increase of this photocatalyst concentration.
Refer to Fig. 1, the preparation method of the nanometer for degradation of formaldehyde provided by the invention spherical porous low light level photocatalyst, comprises the following steps:
Step S1, mixes the titanium source of 0.2%-30% with the alcohols solvent of 60%-99%, forms mixed liquor; In this step, titanium source is any one in tetrabutyl titanate, titanium tetrachloride, titanium trichloride, titanyl sulfate or tetraethyl titanate, in alcohols solvent, carbon containing quantity 1-4 is individual, and is any one in absolute ethyl alcohol, normal propyl alcohol, isopropyl alcohol, n-butanol, sec-butyl alcohol or isobutanol.
Step S2, adds in mixed liquor by the hydrolysis inhibitor of 0.005%-0.01%, carries out forming colloidal sol after violent stirring also synchronously instills the deionized water of the metal ion of 0.005%-0.01% slowly; In this step, hydrolysis inhibitor is any one in ice acid esters, acetylacetone,2,4-pentanedione, concentrated hydrochloric acid, red fuming nitric acid (RFNA), in the deionized water of metal ion, metal ion is any one in bismuth ion, chromium ion, calcium ion, sodium ion, potassium ion, and certain metal ion can also be other ions such as iron ion.
Step S3, stops stirring this colloidal sol and ageing forms transparent light blue gel; In order to the use of next step.
Step S4, will containing SiO under normal temperature condition
2in the hydroxyl of the 10%-40% of crystal seed, strong acid adds in gel slowly, and after carrying out dispergation and reaction, obtains clear solution; In hydroxyl, strong acid is any one in oxalic acid, nitric acid, formic acid, and certainly, can also be the middle strong acid of other types, this clear solution exist loading problem, and film forming strong adhesion.
Step S5, joins containing in inorganic dispersant deionized water containing 1%-5%, and obtains concentrate after stirring by clear solution; Inorganic dispersant is any one in calgon, poly-hydroxyl sodium, calcium carbonate, magnesium calcium carbonate.
Step S6, adds alkali lye and carries out pH adjustment in concentrate, and adjustable range between 2-9, and obtains nano particle vitreosol liquid after dilution, and its domain size distribution is between 10-30nm, and surface be that spherical cellular distributes, and specific area greatly and average out to 300m
2/ more than g.Alkali lye is any one in NaOH, calcium hydroxide, potassium hydroxide, sodium acid carbonate, sodium carbonate, concentrated ammonia liquor, can according to occasion need pH value adjustment is carried out to concentrate, expand the scope of application.
Preparation method provided by the invention, has following advantage:
1) photocatalyst that this method prepares is nano particle vitreosol liquid, long term storage can not produce precipitation, convenient construction, and film forming adhesive force is good, become film hardness high, can not powder of detached, water white transparency, can keep the apparent true qualities of base material, be adapted at all kinds of substrate surface construction operation, the scope of application expands;
2) surface of this photocatalyst is the distribution of spherical cellular, large and more than the average out to 300m2/g of specific area, this photocatalyst is made to have large average specific surface area, due to strong adsorption effect, pollute the formation of thing local concentration gradients, accelerate the contact frequency of photocatalyst and pollutant, realize the active purification of material; And great specific area, change " passive exposure degraded " pattern of traditional photocatalyst, adopt " initiatively+passive " two kinds of working methods that pattern combines, realize round-the-clock purification and degrade, raising efficiency;
3) in this component be full inorganic nano component, environmental friendliness, non-secondary pollution, can degrade to the formaldehyde in air in time, and degradation rate become large along with the increase of this photocatalyst concentration;
4) with colloidal sol, gel carry out dispergation, dilution technique for synthesis main points with strong acid in hydroxyl, ordinary temperature production and the directly application of product is realized;
5) in manufacture craft, adopt the deionized water of metal ion, achieve mixing of metal ion, natural visible ray utilization rate promotes, successful of degrading under low light condition;
6) in preparation method can according to occasion need select concentration and pH value, achieve acid-base value and pH value is adjustable, the restriction of use occasion can be broken away from;
7) this photocatalyst manufacture mild condition, production safety risk little, easily realize volume production, low light level catalytic purification, stability are high, the problems such as emphasis is harsh for current ripe photocatalyst product preparation condition, sunshine utilization rate is low, purification of air degradation efficiency is low, base material apparent effect large, construction inconvenience are solved.
The present invention also provides the application of a kind of nanometer spherical porous low light level photocatalyst, the application of the nanometer obtained by above-mentioned preparation method spherical porous low light level photocatalyst in degradation of formaldehyde, its effect is obvious, by following three specific experiment examples, the application of this photocatalyst at degradation of formaldehyde is described:
experimental example one
One, experimental technique:
1, be that 0.5% nano particle vitreosol liquid sample is sprayed on the glass plate of 1 square metre by a certain amount of concentration, be placed in the glass experiment bin of 1.5 cubic metres, the formaldehyde gas of a certain amount of normal concentration is filled with under dark room conditions, and start air circulating pump in storehouse, stop when concentration of formaldehyde in storehouse is stabilized in 510ppb being filled with formaldehyde standard gas.After dark adsorption equilibrium (process time is generally 0.5-1h, is considered as dark adsorption equilibrium when gas concentration change is less than 10ppb/h in storehouse), concentration of formaldehyde in point three tests within the 1.5h time afterwards, and record.After testing, open fluorescent lamp (wave-length coverage 400-800nm) in storehouse and irradiate.A case concentration of formaldehyde is recorded every half an hour.
2, experimental situation: temperature 20 DEG C, humidity 60RH%.
Two, record is curve plotting also
Initial data is as following table
3, degraded formula
4, Fig. 2 is the curve map of the concentration degraded of formaldehyde.
experimental example two
One, experimental technique:
1, be that 0.2% nano particle vitreosol liquid sample is sprayed on the glass plate of 1 square metre by a certain amount of concentration, be placed in the glass experiment bin of 1.5 cubic metres, the formaldehyde gas of a certain amount of normal concentration is filled with under dark room conditions, and start air circulating pump in storehouse, stop when concentration of formaldehyde in storehouse is stabilized in 510ppb being filled with formaldehyde standard gas.After dark adsorption equilibrium (process time is generally 0.5-1h, is considered as dark adsorption equilibrium when gas concentration change is less than 10ppb/h in storehouse), concentration of formaldehyde in point three tests within the 1.5h time afterwards, and record.After testing, open fluorescent lamp (wave-length coverage 400-800nm) in storehouse and irradiate.A case concentration of formaldehyde is recorded every half an hour.
2, experimental situation: temperature 20 DEG C, humidity 60RH%.
Two, record is curve plotting also
Initial data is as following table
3, degraded formula
4, Fig. 3 is the curve map of the concentration degraded of formaldehyde.
experimental example three
One, experimental technique:
1, be that 0.1% nano particle vitreosol liquid sample is sprayed on the glass plate of 1 square metre by a certain amount of concentration, be placed in the glass experiment bin of 1.5 cubic metres, the formaldehyde gas of a certain amount of normal concentration is filled with under dark room conditions, and start air circulating pump in storehouse, stop when concentration of formaldehyde in storehouse is stabilized in 510ppb being filled with formaldehyde standard gas.After dark adsorption equilibrium (process time is generally 0.5-1h, is considered as dark adsorption equilibrium when gas concentration change is less than 10ppb/h in storehouse), concentration of formaldehyde in point three tests within the 1.5h time afterwards, and record.After testing, open fluorescent lamp (wave-length coverage 400-800nm) in storehouse and irradiate.A case concentration of formaldehyde is recorded every half an hour.
2, experimental situation: temperature 20 DEG C, humidity 60RH%.
Two, record is curve plotting also
3, degraded formula
4, Fig. 4 is the curve map of the concentration degraded of formaldehyde.
By above-mentioned three experiments, the conclusion obtained is: 1) along with the increase of nano particle vitreosol liquid concentration, and the concentration degradation rate of its formaldehyde is higher; 2) the concentration degradation rate of formaldehyde is in becoming large Long-term change trend gradually; 3) formaldehyde reaction equation in degradation process is CH
2o---CO
2+ H
2o.
The principle of degradation of formaldehyde of the present invention is as follows: in the air having a small amount of steam, when the photon irradiation that energy exceedes photocatalyst energy gap is at photocatalyst surface, the electrons of valence band is excited to conduction band, highly active electronics e-is formed at conduction band, produce the hole h+ of a positively charged in valence band simultaneously, excite that the electron-hole pair of rear generation is very fast moves to surface in body.
In photocatalytic oxidation air formaldehyde reaction condition under, the oxygen be adsorbed in the air of photocatalyst surface is reduced to O by light induced electron
2-, minor amount of water is OH by Hole oxidation, and both are that the deep oxidation of formaldehyde provides highly active oxidant O
2-attack C-H key of formaldehyde with OH, the H atom active with it produces new free radical, excites chain reaction, finally makes Formaldehyde decomposition be H
2o and CO
2.）
Be only several specific embodiment of the present invention above, but the present invention is not limited thereto, the changes that any person skilled in the art can think of all should fall into protection scope of the present invention.
Claims (10)
1. the spherical porous of the nanometer for a degradation of formaldehyde low light level photocatalyst, it is characterized in that, comprise following raw material by weight percentage: strong acid 10%-40% in the deionized water 0.005%-0.01% of titanium source 0.2%-30%, alcohols solvent 60%-99%, hydrolysis inhibitor 0.005%-0.01%, metal ion, hydroxyl, deionized water 1%-5% containing inorganic dispersant, in this hydroxyl in strong acid containing SiO
2crystal seed; This photocatalyst is nano particle vitreosol liquid, and its domain size distribution is between 10-30nm, and surface is the distribution of spherical cellular, the large and average out to 300m of specific area
2/ more than g.
2. the nanometer for degradation of formaldehyde according to claim 1 spherical porous low light level photocatalyst, it is characterized in that, this photocatalyst comprises following raw material by weight percentage: strong acid 15%-40% in the deionized water 0.008%-0.01% of titanium source 11%-30%, alcohols solvent 60%-70%, hydrolysis inhibitor 0.008%-0.01%, metal ion, hydroxyl, deionized water 2.5%-5% containing inorganic dispersant.
3. the nanometer for degradation of formaldehyde according to claim 1 spherical porous low light level photocatalyst, it is characterized in that, this photocatalyst comprises following raw material by weight percentage: strong acid 21% in the deionized water 0.01% of titanium source 15%, alcohols solvent 60%, hydrolysis inhibitor 0.01%, metal ion, hydroxyl, deionized water 3.98% containing inorganic dispersant.
4., for a preparation method for the nanometer spherical porous low light level photocatalyst of degradation of formaldehyde, it is characterized in that, comprise the following steps:
Step 1, mixes the titanium source of 0.2%-30% with the alcohols solvent of 60%-99%, forms mixed liquor;
Step 2, adds in mixed liquor by the hydrolysis inhibitor of 0.005%-0.01%, carries out forming colloidal sol after violent stirring also synchronously instills the deionized water of the metal ion of 0.005%-0.01% slowly;
Step 3, stops stirring this colloidal sol and ageing forms transparent light blue gel;
Step 4, will containing SiO under normal temperature condition
2in the hydroxyl of the 10%-40% of crystal seed, strong acid adds in gel slowly, and after carrying out dispergation and reaction, obtains clear solution;
Step 5, joins containing in inorganic dispersant deionized water containing 1%-5%, and obtains concentrate after stirring by clear solution;
Step 6, adds alkali lye and carries out pH adjustment in concentrate, and adjustable range between 2-9, and obtains nano particle vitreosol liquid after dilution, and its domain size distribution is between 10-30nm, and surface be that spherical cellular distributes, and specific area greatly and average out to 300m
2/ more than g.
5. the preparation method of the nanometer for degradation of formaldehyde according to claim 4 spherical porous low light level photocatalyst, is characterized in that, described titanium source is any one in tetrabutyl titanate, titanium tetrachloride, titanium trichloride, titanyl sulfate or tetraethyl titanate; In described alcohols solvent, carbon containing quantity 1-4 is individual, and is any one in absolute ethyl alcohol, normal propyl alcohol, isopropyl alcohol, n-butanol, sec-butyl alcohol or isobutanol.
6. the preparation method of the nanometer for degradation of formaldehyde according to claim 4 spherical porous low light level photocatalyst, it is characterized in that, the metal ion in the deionized water of described metal ion is any one in bismuth ion, chromium ion, calcium ion, sodium ion, potassium ion.
7. the preparation method of the nanometer for degradation of formaldehyde according to claim 4 spherical porous low light level photocatalyst, is characterized in that, in described hydroxyl, strong acid is any one in oxalic acid, boric acid, dust technology, phosphoric acid, formic acid.
8. the preparation method of the nanometer for degradation of formaldehyde according to claim 4 spherical porous low light level photocatalyst, is characterized in that, described inorganic dispersant is any one in calgon, poly-hydroxyl sodium, calcium carbonate, magnesium calcium carbonate; Described hydrolysis inhibitor is any one in ice acid esters, acetylacetone,2,4-pentanedione, concentrated hydrochloric acid, red fuming nitric acid (RFNA).
9. the preparation method of the nanometer for degradation of formaldehyde according to claim 4 spherical porous low light level photocatalyst, is characterized in that, described alkali lye is any one in NaOH, calcium hydroxide, potassium hydroxide, sodium acid carbonate, sodium carbonate, concentrated ammonia liquor.
10. the nanometer that the preparation method described in any one of claim 4-9 obtains a spherical porous low light level photocatalyst, the application of described nanometer spherical porous low light level photocatalyst in degradation of formaldehyde.
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| CN107158941A (en) * | 2017-06-22 | 2017-09-15 | 姚望新 | It is a kind of to be used for indoor formaldehyde remover |
| CN107158941B (en) * | 2017-06-22 | 2019-05-24 | 广西贝仕特环保科技有限公司 | One kind being used for indoor formaldehyde remover |
| CN110773207A (en) * | 2019-09-25 | 2020-02-11 | 陈红菊 | Cold catalyst material capable of completely decomposing formaldehyde at room temperature in absence of light and preparation method thereof |
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