CN106178941A - A kind of cadmium telluride quantum dot/composite titania material and application thereof - Google Patents
A kind of cadmium telluride quantum dot/composite titania material and application thereof Download PDFInfo
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- CN106178941A CN106178941A CN201610622510.1A CN201610622510A CN106178941A CN 106178941 A CN106178941 A CN 106178941A CN 201610622510 A CN201610622510 A CN 201610622510A CN 106178941 A CN106178941 A CN 106178941A
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- B01D53/34—Chemical or biological purification of waste gases
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Abstract
The invention discloses a kind of cadmium telluride quantum dot/composite titania material and application thereof, employing following steps are prepared from: be dissolved in deionized water by five water Caddy (Clearyies, then according to five water Caddy (Clearyies: the mol ratio of TGA=1:0.2～5 is added dropwise over TGA, and by NaOH solution by pH value regulation extremely alkalescence, add sodium hydrogen telluride solution, being heated to reflux 1～24 hour, prepared quantum point grain diameter is the cadmium telluride quantum dot solution of 1～20nm；According to isopropyl titanate: isopropyl titanate is dissolved in ethanol by the volume ratio of cadmium telluride quantum dot solution=1:2～15, and it is added dropwise over described cadmium telluride quantum dot solution, it is stirred for 30 minutes, and carries out the heating in water bath of 48 hours, thus obtain cadmium telluride quantum dot/composite titania material.The present invention can be greatly improved photocatalytic activity under visible light illumination, thus improves the utilization rate to sunlight, has expanded the range of application of titanium dioxide, has been very suitable for for purifying indoor formaldehyde.
Description
Technical field
The present invention relates to purifying formaldehyde field, particularly relate to a kind of cadmium telluride quantum dot/composite titania material and
Application.
Background technology
Along with growth in the living standard, various modern furnitures and a large amount of new decorative material constantly pour in indoor, these
Ornament materials and furniture can be at sustained release formaldehyde within the time of several years, and this can cause high risks to health.
At present, the method that PARA FORMALDEHYDE PRILLS(91,95) carries out purifying mainly has absorption method, chemical removal method and photocatalytic degradation method.With absorption
Method is compared with chemical removal method, and photocatalytic degradation method has effect persistent period length, will not produce secondary pollution, to environment and people
The features such as body is harmless, therefore use photocatalytic degradation method to carry out purifying formaldehyde and are increasingly paid close attention to by people.
In purifying formaldehyde field, photocatalytic degradation method uses most photocatalysts to be titanium dioxide, but simple two
Titanium oxide energy gap is relatively big, only just can show photocatalytic activity under ultraviolet excitation, and the ultraviolet light of indoor is less,
The most simple titanium dioxide is the lowest to the utilization rate of sunlight, is not suitable for being directly used in purifying indoor formaldehyde.In order to enable more have
Effect utilize visible ray, there has been proposed the method for doped semiconductor materials in titanium dioxide, but of the prior art two
Titanium oxide and the composite of quasiconductor are the lowest to sunlight utilization rate.
Summary of the invention
For above-mentioned weak point of the prior art, the invention provides a kind of cadmium telluride quantum dot/titanium dioxide multiple
Condensation material and application thereof, it is possible to photocatalytic activity under visible light illumination is greatly improved, thus improves the profit to sunlight
By rate, expand the range of application of titanium dioxide, be very suitable for for purifying indoor formaldehyde.
It is an object of the invention to be achieved through the following technical solutions:
A kind of cadmium telluride quantum dot/composite titania material, uses following steps to be prepared from:
Step A, nitrogen protection environment under, according to every 0.35g five water Caddy (Cleary) use 300mL deionized water ratio,
Five water Caddy (Clearyies are dissolved in deionized water, then according to five water Caddy (Clearyies: the mol ratio of TGA=1:0.2～5 is dropwise
Add TGA, and by NaOH solution by after this mixing, the pH value regulation of liquid is to alkalescence, according still further to five water Caddy (Clearyies: tellurium hydrogen
The mol ratio changing sodium=1:0.1～1 adds sodium hydrogen telluride solution, and is heated to reflux 1～24 hour, thus has prepared quantum dot grain
Footpath is the cadmium telluride quantum dot solution of 1～20nm；
Step B, according to isopropyl titanate: the volume ratio of cadmium telluride quantum dot solution=1:2～15, isopropyl titanate is dissolved in second
In alcohol, and it is added dropwise in step A the cadmium telluride quantum dot solution that quantum point grain diameter is 1～20nm prepared, is stirred for 30 points
Clock, and carry out the heating in water bath process of 48 hours, thus obtain cadmium telluride quantum dot/composite titania material.
Preferably, described sodium hydrogen telluride solution uses following steps to be prepared from: use according to every 1.2g sodium borohydride
2mL deionized water and the ratio of 0.6g tellurium powder, mix sodium borohydride with deionized water and tellurium powder, and with the bath temperature of 80 DEG C
Carry out heating in water bath, until mixed solution becomes colorless transparent, thus prepare sodium hydrogen telluride solution.
Preferably, described with 180 DEG C of insulations 48 hours after, be first cooled to room temperature, then the solid precipitation obtained entered
Row cleans and is dried, thus obtains cadmium telluride quantum dot/composite titania material that cleaning is dried.
Cadmium telluride quantum dot/composite titania material described in technique scheme is used for purifying indoor formaldehyde.
As seen from the above technical solution provided by the invention, cadmium telluride quantum dot/titanium dioxide provided by the present invention
Titanium composite material is by five water Caddy (Clearyies, TGA and sodium hydrogen telluride solution proportions's relation and be heated to reflux the time
It is controlled, such that it is able to prepare the cadmium telluride quantum dot solution that quantum point grain diameter is 1～20nm；Then water bath heating is used
The cadmium telluride quantum dot solution that quantum point grain diameter is 1～20nm is synthesized with isopropyl titanate, such that it is able to make titanium dioxide
The cadmium telluride quantum dot with low-gap semiconductor characteristic that middle doping particle diameter is the least；These cadmium telluride quantum dots are at visible ray
Irradiate and lower can produce the light induced electron that can move on titanium dioxide in a large number such that it is able to titanium dioxide is greatly improved can
Seeing the photocatalytic activity under light irradiation, this improves the utilization rate to sunlight, has expanded the range of application of titanium dioxide, very
It is suitable for purifying indoor formaldehyde.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, required use in embodiment being described below
Accompanying drawing be briefly described, it should be apparent that, below describe in accompanying drawing be only some embodiments of the present invention, for this
From the point of view of the those of ordinary skill in field, on the premise of not paying creative work, it is also possible to obtain other according to these accompanying drawings
Accompanying drawing.
Fig. 1 is that the isopropyl titanate prepared in simple titanium dioxide and the embodiment of the present invention 2 is molten with cadmium telluride quantum dot
Cadmium telluride quantum dot/composite titania material that the volume ratio of liquid is respectively 1:2,1:5,1:10,1:15 is the most right
The clean-up effect comparison diagram of indoor formaldehyde.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Ground describes, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based on this
Inventive embodiment, the every other enforcement that those of ordinary skill in the art are obtained under not paying creative work premise
Example, broadly falls into protection scope of the present invention.
Below cadmium telluride quantum dot/composite titania material provided by the present invention is described in detail.
A kind of cadmium telluride quantum dot/composite titania material, uses following steps to be prepared from:
Step A, nitrogen protection environment under, according to every 0.35g five water Caddy (Cleary) use 300mL deionized water ratio,
Five water Caddy (Clearyies are dissolved in deionized water, then according to five water Caddy (Clearyies: the mol ratio of TGA=1:0.2～5 is dropwise
Add TGA, and by the NaOH solution of 1mol/L by after this mixing, the pH value regulation of liquid is to alkalescence, according still further to five water chlorine
The mol ratio of cadmium: sodium hydrogen telluride=1:0.1～1 adds sodium hydrogen telluride solution, and is heated to reflux 1～24 hour, thus prepares
Cadmium telluride quantum dot solution that quantum point grain diameter is 1～20nm.The present invention is by five water Caddy (Clearyies, TGA and tellurium hydrogen
Change sodium solution proportions's relation and the time that is heated to reflux regulates and controls, obtained cadmium telluride quantum dot solution can be made
Particle diameter changes in 1～20nm.
Step B, according to isopropyl titanate: the volume ratio of cadmium telluride quantum dot solution=1:2～15, isopropyl titanate is dissolved in second
In alcohol, and it is added dropwise in step A the cadmium telluride quantum dot solution that quantum point grain diameter is 1～20nm prepared, is stirred for 30 points
Clock, and carry out heating in water bath 48 hours, thus obtain cadmium telluride quantum dot/composite titania material.
Specifically, above-mentioned steps can include following specific embodiments:
(1) described sodium hydrogen telluride solution can use following steps to be prepared from: uses 2mL to go according to every 1.2g sodium borohydride
Ionized water and the ratio of 0.6g tellurium powder, mix sodium borohydride with deionized water and tellurium powder, and carries out with the bath temperature of 80 DEG C
Heating in water bath, until mixed solution becomes colorless transparent, thus prepares sodium hydrogen telluride solution.
(2) described with 180 DEG C of insulations 48 hours after, be first cooled to room temperature, then the solid precipitation obtained carried out clearly
Wash (the most first carrying out washing uses ethanol to be carried out again) and be dried (being preferably dried with 80 DEG C), thus obtaining clear
Clean dry cadmium telluride quantum dot/composite titania material.
Further, with use simple titanium dioxide as compared with photocatalyst, cadmium telluride amount provided by the present invention
Sub-point/composite titania material by five water Caddy (Clearyies, TGA and sodium hydrogen telluride solution proportions's relation and
The time of being heated to reflux is controlled, such that it is able to prepare the cadmium telluride quantum dot solution that quantum point grain diameter is 1～20nm；Then adopt
With water bath heating, the cadmium telluride quantum dot solution that quantum point grain diameter is 1～20nm is synthesized with isopropyl titanate, thus can
The cadmium telluride quantum dot with low-gap semiconductor characteristic that particle diameter is the least so that adulterating in titanium dioxide；These cadmium telluride amounts
Son point can produce the light induced electron that can move in a large number on titanium dioxide under the radiation of visible light such as daylight lamp such that it is able to big
Width improves titanium dioxide photocatalytic activity under visible light illumination.Titanium dioxide surface occurs greatly under photocatalytic activity effect
Amount hole and light induced electron, and steam and the oxygen in the air of titanium dioxide surface absorption can be by these holes and photoproduction
Electron redox is hydroxyl radical free radical and negative oxygen ion, and these hydroxyl radical free radicals and the oxidation that negative oxygen ion is formaldehyde provide
Highly active oxidant, therefore the organic molecule such as formaldehyde in air can be degraded to CO2、H2The inorganic molecules things such as O
Matter, such that it is able to make the formaldehyde in air be purified.Visible, cadmium telluride quantum dot/titanium dioxide provided by the present invention is multiple
Condensation material can be greatly improved titanium dioxide photocatalytic activity under visible light illumination, thus improves the utilization to sunlight
Rate, has expanded the range of application of titanium dioxide, has been very suitable for for purifying indoor formaldehyde.
In order to more clearly from show technical scheme provided by the present invention and produced technique effect, below with tool
Cadmium telluride quantum dot/composite titania material and application thereof that the present invention is provided by body embodiment are described in detail.
Embodiment 1
A kind of cadmium telluride quantum dot/composite titania material, uses following steps to be prepared from:
Step A, with nitrogen, the conical flask of 50mL is purged 10 minutes, then weigh 1.2g sodium borohydride and be placed in conical flask
In, add 2mL deionized water and 0.6g tellurium powder, and carry out heating in water bath with the bath temperature of 80 DEG C, until mixed molten
Liquid becomes colorless transparent, i.e. prepares sodium hydrogen telluride solution.
Step B, nitrogen protection environment under, 0.35g five water Caddy (Cleary) is dissolved in 300mL deionized water, then according to
Five water Caddy (Clearyies: the mol ratio of TGA=1:0.2～5 is added dropwise over TGA, and adjusts by the NaOH solution of 1mol/L
The pH value of joint mixed solution is to alkalescence, according still further to five water Caddy (Clearyies: the mol ratio of sodium hydrogen telluride=1:0.1～1 rapidly joins step
The sodium hydrogen telluride solution prepared in rapid A, and be heated to reflux 2 hours, prepared quantum point grain diameter is that the cadmium telluride quantum dot of 5nm is molten
Liquid.
Step C, 5mL isopropyl titanate is dissolved in 20mL ethanol, is then added dropwise in 55mL step B the cadmium telluride prepared
Quantum dot solution (i.e. isopropyl titanate is 1:11 with the volume ratio of cadmium telluride quantum dot solution), and stir 30 minutes, it is then transferred to
The reactor of 100mL carries out the heating in water bath of 48 hours with 180 DEG C；After question response still is cooled to room temperature, to the solid obtained
Precipitation carries out washing and ethanol is washed, and is dried with 80 DEG C, thus i.e. can obtain cadmium telluride quantum dot/dioxy that cleaning is dried
Change titanium composite material.
Embodiment 2
Respectively with isopropyl titanate: the volume ratio of cadmium telluride quantum dot solution=1:2,1:5,1:10,1:15, and according to this
Preparation process in bright embodiment 1 prepare the volume ratio of isopropyl titanate and cadmium telluride quantum dot solution be respectively 1:2,1:5,1:
10, the cadmium telluride quantum dot/composite titania material of 1:15.
According to the purifying formaldehyde described in " function of purifying indoor air coating material purification property " (JC/T1074-2008)
Energy detection method is respectively to the isopropyl titanate to prepare in simple titanium dioxide and the embodiment of the present invention 2 and cadmium telluride quantum dot
The volume ratio of solution is respectively the cadmium telluride quantum dot/composite titania material of 1:2,1:5,1:10,1:15 as photocatalysis
Agent carries out purifying formaldehyde effect detection, thus obtains these photocatalysts as shown in Figure 1 under fluorescent light to indoor formaldehyde
Clean-up effect comparison diagram.Photocatalyst is not used to carry out the indoor formaldehyde purified as it is shown in figure 1, curve control HCHO represents
Changes of contents curve (namely baseline control curve), curve TiO2Represent and carry out as photocatalyst using simple titanium dioxide
The indoor formaldehyde content change curve purified, curve 1:15 represents the isopropyl titanate to prepare in the embodiment of the present invention 2 and telluride
The volume ratio of cadmium quantum dot solution is that the cadmium telluride quantum dot/composite titania material of 1:15 purifies as photocatalyst
Indoor formaldehyde content change curve, curve 1:10 represents isopropyl titanate and the cadmium telluride amount to prepare in the embodiment of the present invention 2
Cadmium telluride quantum dot/the composite titania material that volume ratio is 1:10 of son point solution carries out the room purified as photocatalyst
Interior content of formaldehyde change curve, curve 1:5 represents that the isopropyl titanate to prepare in the embodiment of the present invention 2 is molten with cadmium telluride quantum dot
The volume ratio of liquid is the indoor formaldehyde that the cadmium telluride quantum dot/composite titania material of 1:5 carries out as photocatalyst purifying
Changes of contents curve, curve 1:2 represents with the body of the isopropyl titanate prepared in the embodiment of the present invention 2 with cadmium telluride quantum dot solution
The long-pending indoor formaldehyde content carrying out purifying as photocatalyst than the cadmium telluride quantum dot/composite titania material for 1:2 becomes
Change curve.As seen from Figure 1: the degradation efficiency of pure titinium dioxide PARA FORMALDEHYDE PRILLS(91,95) is low, and being doped with particle diameter is 1～20nm cadmium telluride
The titanium dioxide degradable efficiency of quantum dot is greatly improved, and particularly isopropyl titanate is 1 with the volume ratio of cadmium telluride quantum dot solution:
Cadmium telluride quantum dot/the composite titania material of 5, the efficiency of its degraded indoor formaldehyde is optimal.
As fully visible, the embodiment of the present invention can be greatly improved photocatalytic activity under visible light illumination, thus improves
Utilization rate to sunlight, has expanded the range of application of titanium dioxide, has been very suitable for for purifying indoor formaldehyde.
The above, the only present invention preferably detailed description of the invention, but protection scope of the present invention is not limited thereto,
Any those familiar with the art in the technical scope that the invention discloses, the change that can readily occur in or replacement,
All should contain within protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims
Enclose and be as the criterion.
Claims (4)
1. cadmium telluride quantum dot/composite titania material, it is characterised in that use following steps to be prepared from:
Step A, nitrogen protection environment under, according to every 0.35g five water Caddy (Cleary) use 300mL deionized water ratio, by five
Water Caddy (Cleary) is dissolved in deionized water, then according to five water Caddy (Clearyies: the mol ratio of TGA=1:0.2～5 is added dropwise over
TGA, and by NaOH solution by after this mixing, the pH value regulation of liquid is to alkalescence, according still further to five water Caddy (Clearyies: sodium hydrogen telluride
The mol ratio of=1:0.1～1 adds sodium hydrogen telluride solution, and is heated to reflux 1～24 hour, thus has prepared quantum point grain diameter and be
The cadmium telluride quantum dot solution of 1～20nm；
Step B, according to isopropyl titanate: the volume ratio of cadmium telluride quantum dot solution=1:2～15, isopropyl titanate is dissolved in ethanol
In, and it is added dropwise in step A the cadmium telluride quantum dot solution that quantum point grain diameter is 1～20nm prepared, it is stirred for 30 minutes,
And the heating in water bath carried out 48 hours processes, thus obtain cadmium telluride quantum dot/composite titania material.
Cadmium telluride quantum dot/composite titania material the most according to claim 1, it is characterised in that described tellurium hydrogen
Changing sodium solution uses following steps to be prepared from:
Use 2mL deionized water and the ratio of 0.6g tellurium powder according to every 1.2g sodium borohydride, by sodium borohydride and deionized water and
Tellurium powder mixes, and carries out heating in water bath with the bath temperature of 80 DEG C, until mixed solution becomes colorless transparent, thus prepares
Sodium hydrogen telluride solution.
Cadmium telluride quantum dot/composite titania material the most according to any one of claim 1 to 2, it is characterised in that
Described with 180 DEG C of insulations 48 hours after, be first cooled to room temperature, then the solid precipitation obtained be carried out and be dried, from
And obtain cadmium telluride quantum dot/composite titania material that cleaning is dried.
4. cadmium telluride quantum dot/the composite titania material according to any one of the claims 1 to 3 is in clean room
Formaldehyde.
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| CN111318275A (en) * | 2020-03-27 | 2020-06-23 | 北京赛夫依特生物科技有限公司 | Photocatalyst suitable for indoor air purification of dark light |
| CN111318275B (en) * | 2020-03-27 | 2022-08-30 | 北京赛夫依特生物科技有限公司 | Photocatalyst suitable for indoor air purification of dark light |
| CN113235226A (en) * | 2021-05-10 | 2021-08-10 | 南京摩开科技有限公司 | Ultraviolet light and oxygen aging resistant polyurethane nanofiber membrane and preparation method thereof |
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