CN105056931A - Zinc magnesium indium composite oxide with near-infrared light catalytic activity, and preparation method and application thereof - Google Patents
Zinc magnesium indium composite oxide with near-infrared light catalytic activity, and preparation method and application thereof Download PDFInfo
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Abstract
The invention relates to a zinc magnesium indium composite oxide with near-infrared light catalytic activity, and a preparation method and application thereof and belongs to the field of photocatalytic materials. The chemical structural formula of the zinc magnesium indium composite oxide is Zn3Mg3In2O9. The zinc magnesium indium composite oxide is of an irregular sheet structure, and the grain size is 50-200 nm. A hydrotalcite-like slice layer structure of a precursor of the zinc magnesium indium composite oxide is not destroyed completely, zinc oxide, magnesium oxide and indium oxide are not subjected to complete and independent crystallization and phase splitting, the zinc magnesium indium composite oxide is of a porous sheet structure, and the diameter is 50-200 nm. Besides the photocatalytic activity in a near-infrared light area, the zinc magnesium indium composite oxide has photocatalytic activity in ultraviolet and visible light areas, has good performance of adsorbing organic matter on the conditions of darkness, and belongs to broad spectrum photocatalysts good in adsorption performance. The invention further provides the method for preparing Zn3Mg3In2O9 and application of Zn3Mg3In2O9 serving as a photocatalytic degradation reaction catalyst on the conditions of near-infrared light, ultraviolet and visible light irradiation.
Description
Technical field
The present invention relates to a kind of zinc-magnesium indium composite oxides with near infrared light catalytic activity and its preparation method and application, belong to field of photocatalytic material.
Background technology
Photocatalysis utilizes photochemical catalyst the luminous energy that nature exists to be converted into the energy needed for chemical reaction thus the catalytic action produced.Utilizing photochemical catalyst to carry out catalyze and degrade organic pollutants both can pollution administration, can utilize solar energy again, reduce the dependence to non-renewable energy resources, thus be subject to more coming to pay close attention to widely.Oxide semiconductor class photochemical catalyst is as cheap in titanium dioxide, zinc oxide, environmental friendliness, and all can degrade to non-selectivity to majority of organic pollutants, occupies very important status in photocatalysis field.But the energy gap of titanium dioxide and zinc oxide is about 3.2eV, only can absorbs ultraviolet light, and arrive in the sunshine on ground, contained ultraviolet less than 5%, and accounts for the visible ray of sunshine gross energy about more than 90% and near infrared light can not be utilized.
In recent years, domestic and international researcher attempts adopting various approach to modify and modification the semiconductor light-catalyst such as titanium dioxide, zinc oxide, to widening its spectral response range and improving its photocatalytic activity.As the nonmetalloids such as carbon, nitrogen, sulphur, boron introduced the Lacking oxygen in metal oxide lattice or replacing part Lacking oxygen, the energy gap of metal oxide can be made to narrow; Other transition metal ions, rare earth ion and precious metal ion is introduced in metal oxide lattice, shape impurity energy level, make the electronics in valence band by transitting to impurity energy level by the optical excitation of longer wavelength, after transitting to impurity energy level, by energy absorption again, transit to conduction band again by impurity energy level, thus reduce can the wavelength of response light; At metal oxide surface depositing noble metal, promote that light induced electron externally moves, stop the compound in light induced electron-hole; Two or more different for energy gap semi-conducting materials are compound to together, form nano-heterogeneous structure, to promote the separation in electronics-hole, thus the spectral response range etc. of expansion material.In addition, by by zinc salt and the co-precipitation of aluminium salt, form the mixed metal hydroxides of hydrotalcite-like compound, then through suitable high-temperature calcination, also can form zinc oxide and the zinc aluminate composite oxides of evenly " doping ", expand the light abstraction width of zinc oxide with this.But the spectral response range of titanium dioxide and zinc oxide only can expand to and by light region, or can improve its ultraviolet catalytic activity by these approach, and the near infrared light accounting for solar energy nearly about 44% is not still utilized effectively.
Therefore, the oxide-based photochemical catalyst of full spectrum with ultraviolet light, visible ray and near infrared light catalytic activity is developed just more urgent.
Summary of the invention
The object of the present invention is to provide a kind of composite oxides class photochemical catalyst all in ultraviolet, visible and near infrared light region with photocatalytic activity prepared by using houghite as precursor.
Present invention also offers the above-mentioned preparation method with the composite oxides class photochemical catalyst of near infrared light catalytic activity, and the application of above-mentioned composite oxides class photochemical catalyst.
Technical scheme of the present invention
Have zinc-magnesium indium composite oxides near infrared light catalytic activity, its chemical structural formula is: Zn
3mg
3in
2o
9.
Above-mentioned zinc-magnesium indium composite oxides, in irregular laminated structure, particle diameter 50-200nm; Transmission electron microscope photo as shown in Figure 1.
Zinc-magnesium indium composite oxides of the present invention, the houghite lamellar structure of its precursor is not destroyed completely, and zinc oxide, magnesia and indium oxide be distinct crystalline and phase-splitting not yet completely, has porous laminated structure, diameter 50-200nm.These zinc-magnesium indium composite oxides are except having except photocatalytic activity near infrared light region, also all there is photocatalytic activity in Uv and visible light region, under dark condition, to organic matter, there is good absorption property, belong to the wide spectral photochemical catalyst that absorption property is good.
Zinc-magnesium indium composite oxides of the present invention, the mol ratio of its zinc ion, magnesium ion, indium ion can only be 3:3:2 of the present invention; Otherwise, photocatalytic Degradation can not be produced to organic pollution under near infrared light.
The preparation method of above-mentioned zinc-magnesium indium composite oxides, first adopts coprecipitation to prepare zinc-magnesium indium mixed metal hydroxides, then at 400-600
ocalcine 3 hours under C, obtain zinc-magnesium indium composite oxides.The present invention, by zinc-magnesium indium ratio and each parameter in control procedure, makes the product of acquisition have the catalysis characteristics of wide spectral catalyze and degrade organic pollutants.
Above-mentioned preparation method, comprises the following steps:
(1) preparation contains the nitrate solution of zinc ion, magnesium ion, indium ion in proportion; NaOH and sodium carbonate are dissolved in the water by the mol ratio of 3:1, form mixed ammonium/alkali solutions;
(2) under agitation by nitrate solution and mixed ammonium/alkali solutions mixing, control reactant mixture pH between 10-11, form coprecipitate colloid; Stir coprecipitate colloid to disperse to it, be warming up to 55
oc, then stir 3 hours, cool to room temperature, taking precipitate; Wash sediment with water to neutral, then in 55
oc vacuum drying is also ground, then is placed in Muffle furnace in 400-600
o3 hours are processed under C.
Above-mentioned preparation method, in nitrate solution, the mol ratio of zinc ion, magnesium ion, indium ion can only be 3:3:2; Even otherwise the compound prepared in houghite layer structure, can not obtain under near infrared light, ultraviolet light, radiation of visible light after calcining, all organic pollution be produced to the zinc-magnesium indium composite oxides of good catalytic degradation effect.
Above-mentioned preparation method, the pH of reactant mixture must control between 10-11, to guarantee the co-precipitation hydroxide forming zinc, magnesium, indium three metal ion species, otherwise cannot form desirable hydrotalcite-like compound; And the temperature in Muffle furnace, if the too low decomposition being unfavorable for zinc-magnesium indium mixed hydroxides and interlayer carbanion thereof, temperature is too high, causes the phase-splitting of zinc, magnesium, indium oxide, causes prepared product near infrared light catalytic activity poor, even loses near infrared light catalytic activity; Therefore, muffle furnace must control at 400-600
obetween C.Preferably, pH is 10.5, and the temperature in Muffle furnace is 500
oc; Under this pH, temperature conditions, the catalytic degradation performance of prepared zinc-magnesium indium composite oxides is better.
Above-mentioned preparation method, preferably, the concrete operations of step (2) are as follows:
Under agitation nitrate solution and mixed ammonium/alkali solutions are added drop-wise in reactor simultaneously, control reactant mixture pH, form coprecipitate colloid;
High degree of agitation coprecipitate colloid, is uniformly dispersed completely to it, is then warming up to 55 DEG C, slight stirring 3 hours, naturally cools to room temperature and leaves standstill 12h, taking precipitate;
Grind in 55 DEG C of vacuum drying after washing sediment to neutrality with water, to be then placed in Muffle furnace process 3 hours.
Zinc-magnesium indium composite oxides of the present invention under near infrared light, ultraviolet light and radiation of visible light condition as the application of photocatalytic degradation catalysts.Preferably, under near infrared light condition, as the application of photocatalytic degradation catalysts.
Above-mentioned application, described photocatalytic degradation reacts for the photocatalytic degradation of organic pollution reacts, particularly the photocatalytic degradation reaction of methyl orange.This light-catalyzed reaction can use general quartz reactor or quartz test tube to complete under the condition stirred.
Above-mentioned application, preferably,
Described ultraviolet light is provided by the medium pressure mercury lamp of 300W;
Describedly can will see that light provides by pressing xenon lamp in 300W;
Described near infrared light filters wavelength for providing after 200nm-780nm light by the infrared lamp light source filter plate of 275W.
In the present invention, if no special instructions, described water is deionized water.
Beneficial effect:
Zinc-magnesium indium composite oxides of the present invention have excellent near infrared light, ultraviolet light and visible light catalytic performance, the clearance of 3 hours near-infrared photo-catalytic degradation of methyl-oranges is 83%, the clearance rate of 2 hours ultraviolet catalytic degraded methyl orange reaches 95%, and the clearance of 2 hours visible light photocatalytic degradation methyl orange reaches 92%.Therefore, zinc-magnesium indium composite oxides of the present invention are a kind of wide spectrum photocatalytic agent, and energy is photocatalysis degradation organic contaminant rapidly, has broad application prospects.The preparation method of zinc-magnesium indium wide spectrum photocatalytic provided by the invention agent is simple to operate, be easy to promote.
Accompanying drawing explanation
Fig. 1 is the transmission electron microscope photo of zinc-magnesium indium composite oxides of the present invention.
Detailed description of the invention
Below in conjunction with specific embodiment, the invention will be further described; Except as otherwise indicating, the described number in embodiment all in mass.
embodiment 1
By 8.93 parts of Zn (NO
3)
26H
2o, 7.7 parts of Mg (NO
3)
26H
2o and 6 part of In (NO
3)
3be dissolved in 100 parts of deionized waters, by 4.8 parts of NaOH and 4.24 part Na
2cO
3be scattered in 200 parts of deionized waters, form mixed ammonium/alkali solutions.Add about 20 parts of deionized waters in the reactor; after being titrated to pH10.5 with mixed ammonium/alkali solutions; under the mixing speed of 1000 revs/min; salt-mixture and mixed ammonium/alkali solutions are added drop-wise in reactor simultaneously; and adjust rate of addition; reaction pH is maintained 10.5, and guarantees that salt-mixture and mixed ammonium/alkali solutions dropwise simultaneously.After dropwising, continue to stir 1 hour under the mixing speed of 1000 revs/min.Afterwards agitator speed is reduced to 500 revs/min, reactant liquor is warmed up to 55 simultaneously
oc, and in 55
oaging 3 hours of C.Naturally, after leaving standstill cool to room temperature, sediment is spent deionized water to neutral, and in 55
oc vacuum drying also, after grinding, is placed in Muffle furnace, with 2
othe speed of C/ minute is warmed up to 500
oc, and in 500
obe incubated 3 hours under C, naturally after cooling, obtain zinc-magnesium indium compound oxide photocatalyst about 4.67 parts.Get 1 part, being put in 2000 parts of concentration 20mg/L methyl orange solutions, in the dark adsorption reaction 3 hours, is 57.4% to the eliminating rate of absorption of methyl orange.Get 1 part, put in 2000 parts of concentration 20mg/L methyl orange solutions, under the condition of near infrared light, have catalytic degradation effect to methyl orange, react 3 hours, methyl orange degradation rate reaches 77.6%.Get 1 part, put in 2000 parts of concentration 20mg/L methyl orange solutions, under visible light illumination, react 2 hours, methyl orange clearance can reach 94.1%.Get 1 part, put in 2000 parts of concentration 20mg/L methyl orange solutions, under UV Light is penetrated, react 2 hours, methyl orange clearance can reach 95.3%.
embodiment 2
By 8.93 parts of Zn (NO
3)
26H
2o, 7.7 parts of Mg (NO
3)
26H
2o and 6 part of In (NO
3)
3be dissolved in 100 parts of deionized waters, by 4.8 parts of NaOH and 4.24 part Na
2cO
3be scattered in 200 parts of deionized waters, form mixed ammonium/alkali solutions.Add about 10 parts of deionized waters in the reactor; after being titrated to pH10 with mixed ammonium/alkali solutions; under the mixing speed of 1200 revs/min; salt-mixture and mixed ammonium/alkali solutions are added drop-wise in reactor simultaneously; and adjust rate of addition; reaction pH is maintained 10, and guarantees that salt-mixture and mixed ammonium/alkali solutions dropwise simultaneously.After dropwising, continue to stir 1 hour under the mixing speed of 1200 revs/min.Afterwards agitator speed is reduced to 500 revs/min, reactant liquor is warmed up to 55 simultaneously
oc, and in 55
oaging 3 hours of C.Naturally, after leaving standstill cool to room temperature, sediment is spent deionized water to neutral, and in 55
oc vacuum drying also, after grinding, is placed in Muffle furnace, with 2
othe speed of C/ minute is warmed up to 500
oc, and in 500
obe incubated 3 hours under C, naturally after cooling, obtain zinc-magnesium indium compound oxide photocatalyst about 4.67 parts.Get 1 part, being put in 2000 parts of concentration 20mg/L methyl orange solutions, in the dark adsorption reaction 3 hours, is 56.7% to the eliminating rate of absorption of methyl orange.Get 1 part, put in 2000 parts of concentration 20mg/L methyl orange solutions, under the condition of near infrared light, have catalytic degradation effect to methyl orange, react 3 hours, methyl orange degradation rate reaches 75.3%.Get 1 part, put in 2000 parts of concentration 20mg/L methyl orange solutions, under visible light illumination, react 2 hours, methyl orange clearance can reach 93.2%.Get 1 part, put in 2000 parts of concentration 20mg/L methyl orange solutions, under UV Light is penetrated, react 2 hours, methyl orange clearance can reach 94.1%.
embodiment 3
By 8.93 parts of Zn (NO
3)
26H
2o, 7.7 parts of Mg (NO
3)
26H
2o and 6 part of In (NO
3)
3be dissolved in 100 parts of deionized waters, by 4.8 parts of NaOH and 4.24 part Na
2cO
3be scattered in 200 parts of deionized waters, form mixed ammonium/alkali solutions.Add about 10 parts of deionized waters in the reactor; after being titrated to pH11 with mixed ammonium/alkali solutions; under the mixing speed of 1200 revs/min; salt-mixture and mixed ammonium/alkali solutions are added drop-wise in reactor simultaneously; and adjust rate of addition; reaction pH is maintained 11, and guarantees that salt-mixture and mixed ammonium/alkali solutions dropwise simultaneously.After dropwising, continue to stir 1 hour under the mixing speed of 1200 revs/min.Afterwards agitator speed is reduced to 500 revs/min, reactant liquor is warmed up to 55 simultaneously
oc, and in 55
oaging 3 hours of C.Naturally, after leaving standstill cool to room temperature, sediment is spent deionized water to neutral, and in 55
oc vacuum drying also, after grinding, is placed in Muffle furnace, with 2
othe speed of C/ minute is warmed up to 500
oc, and in 500
obe incubated 3 hours under C, naturally after cooling, obtain zinc-magnesium indium compound oxide photocatalyst about 4.67 parts.Get 1 part, being put in 2000 parts of concentration 20mg/L methyl orange solutions, in the dark adsorption reaction 3 hours, is 57.1% to the eliminating rate of absorption of methyl orange.Get 1 part, put in 2000 parts of concentration 20mg/L methyl orange solutions, under the condition of near infrared light, have certain catalytic degradation effect to methyl orange, react 3 hours, methyl orange degradation rate reaches 75.9%.Get 1 part, put in 2000 parts of concentration 20mg/L methyl orange solutions, under visible light illumination, react 2 hours, methyl orange clearance can reach 93.3%.Get 1 part, put in 2000 parts of concentration 20mg/L methyl orange solutions, under UV Light is penetrated, react 2 hours, methyl orange clearance can reach 94.8%.
embodiment 4
By 8.93 parts of Zn (NO
3)
26H
2o, 7.7 parts of Mg (NO
3)
26H
2o and 6 part of In (NO
3)
3be dissolved in 100 parts of deionized waters, by 4.8 parts of NaOH and 4.24 part Na
2cO
3be scattered in 200 parts of deionized waters, form mixed ammonium/alkali solutions.Add about 10 parts of deionized waters in the reactor; after being titrated to pH10.5 with mixed ammonium/alkali solutions; under the mixing speed of 1200 revs/min; salt-mixture and mixed ammonium/alkali solutions are added drop-wise in reactor simultaneously; and adjust rate of addition; reaction pH is maintained 10.5, and guarantees that salt-mixture and mixed ammonium/alkali solutions dropwise simultaneously.After dropwising, continue to stir 1 hour under the mixing speed of 1200 revs/min.Afterwards agitator speed is reduced to 500 revs/min, reactant liquor is warmed up to 55 simultaneously
oc, and in 55
oaging 3 hours of C.Naturally, after leaving standstill cool to room temperature, sediment is spent deionized water to neutral, and in 55
oc vacuum drying also, after grinding, is placed in Muffle furnace, with 2
othe speed of C/ minute is warmed up to 400
oc, and in 400
obe incubated 3 hours under C, naturally after cooling, obtain zinc-magnesium indium compound oxide photocatalyst about 4.67 parts.Get 1 part, being put in 2000 parts of concentration 20mg/L methyl orange solutions, in the dark adsorption reaction 3 hours, is 44.3% to the eliminating rate of absorption of methyl orange.Get 1 part, put in 2000 parts of concentration 20mg/L methyl orange solutions, under the condition of near infrared light, have certain catalytic degradation effect to methyl orange, react 3 hours, methyl orange degradation rate reaches 63.2%.Get 1 part, put in 2000 parts of concentration 20mg/L methyl orange solutions, under visible light illumination, react 2 hours, methyl orange clearance can reach 87.3%.Get 1 part, put in 2000 parts of concentration 20mg/L methyl orange solutions, under UV Light is penetrated, react 2 hours, methyl orange clearance can reach 89.1%.
embodiment 5
By 8.93 parts of Zn (NO
3)
26H
2o, 7.7 parts of Mg (NO
3)
26H
2o and 6 part of In (NO
3)
3be dissolved in 100 parts of deionized waters, by 4.8 parts of NaOH and 4.24 part Na
2cO
3be scattered in 200 parts of deionized waters, form mixed ammonium/alkali solutions.Add about 10 parts of deionized waters in the reactor; after being titrated to pH10.5 with mixed ammonium/alkali solutions; under the mixing speed of 1200 revs/min; salt-mixture and mixed ammonium/alkali solutions are added drop-wise in reactor simultaneously; and adjust rate of addition; reaction pH is maintained 10.5, and guarantees that salt-mixture and mixed ammonium/alkali solutions dropwise simultaneously.After dropwising, continue to stir 1 hour under the mixing speed of 1200 revs/min.Afterwards agitator speed is reduced to 500 revs/min, reactant liquor is warmed up to 55 simultaneously
oc, and in 55
oaging 3 hours of C.Naturally, after leaving standstill cool to room temperature, sediment is spent deionized water to neutral, and in 55
oc vacuum drying also, after grinding, is placed in Muffle furnace, with 2
othe speed of C/ minute is warmed up to 600
oc, and in 600
obe incubated 3 hours under C, naturally after cooling, obtain zinc-magnesium indium compound oxide photocatalyst about 4.67 parts.Get 1 part, being put in 2000 parts of concentration 20mg/L methyl orange solutions, in the dark adsorption reaction 3 hours, is 55.1% to the eliminating rate of absorption of methyl orange.Get 1 part, put in 2000 parts of concentration 20mg/L methyl orange solutions, under the condition of near infrared light, have certain catalytic degradation effect to methyl orange, react 3 hours, methyl orange degradation rate reaches 71.4%.Get 1 part, put in 2000 parts of concentration 20mg/L methyl orange solutions, under visible light illumination, react 2 hours, methyl orange clearance can reach 96.4%.Get 1 part, put in 2000 parts of concentration 20mg/L methyl orange solutions, under UV Light is penetrated, react 2 hours, methyl orange clearance can reach 97.3%.
comparative example 1
By 8.93 parts of Zn (NO
3)
26H
2o and 3.75 part of Al (NO
3)
39H
2o is dissolved in 50 parts of deionized waters, by 2.4 parts of NaOH and 2.12 part Na
2cO
3be scattered in 100 parts of deionized waters, form mixed ammonium/alkali solutions.Add about 20 parts of deionized waters in the reactor; after being titrated to pH10.5 with mixed ammonium/alkali solutions; under the mixing speed of 1000 revs/min; salt-mixture and mixed ammonium/alkali solutions are added drop-wise in reactor simultaneously; and adjust rate of addition; reaction pH is maintained 10.5, and guarantees that salt-mixture and mixed ammonium/alkali solutions dropwise simultaneously.After dropwising, continue to stir 1 hour under the mixing speed of 1000 revs/min.Afterwards agitator speed is reduced to 500 revs/min, reactant liquor is warmed up to 55 simultaneously
oc, and in 55
oaging 3 hours of C.Naturally, after leaving standstill cool to room temperature, sediment is spent deionized water to neutral, and in 55
oc vacuum drying also, after grinding, is placed in Muffle furnace, with 2
othe speed of C/ minute is warmed up to 500
oc, and in 500
obe incubated 3 hours under C, naturally after cooling, obtain Zn Al composite oxide photochemical catalyst about 2.95 parts.Get 1 part, being put in 2000 parts of concentration 20mg/L methyl orange solutions, in the dark adsorption reaction 3 hours, is 60.7% to the eliminating rate of absorption of methyl orange.Get 1 part, put in 2000 parts of concentration 20mg/L methyl orange solutions, under the condition of near infrared light, do not have catalytic degradation effect to methyl orange, react 3 hours, methyl orange clearance does not have difference with time dark, is 60.3%.Get 1 part, put in 2000 parts of concentration 20mg/L methyl orange solutions, under visible light illumination, react 2 hours, methyl orange clearance does not still have substantial variation, is only 61.2%.Get 1 part, put in 2000 parts of concentration 20mg/L methyl orange solutions, under UV Light is penetrated, react 2 hours, methyl orange clearance can reach 93.8%.
comparative example 2
By 8.9 parts of Zn (NO
3)
26H
2o, 7.7 parts of Mg (NO
3)
26H
2o and 6 part of In (NO
3)
3be dissolved in 100 parts of deionized waters, by 13.4 parts of Na
2c
2o
4be scattered in 200 parts of deionized waters, form sodium oxalate solution.Add about 20 parts of deionized waters in the reactor, under the mixing speed of 1000 revs/min, salt-mixture and sodium oxalate are added drop-wise in reactor simultaneously, and adjust rate of addition, guarantee that salt-mixture and sodium oxalate solution dropwise simultaneously.After dropwising, continue to stir 1 hour under the mixing speed of 1000 revs/min, and at room temperature naturally leave standstill aging 12 hours, oxalate denominationby deionized water unnecessary in sediment is washed away, and in 55
oc vacuum drying also, after grinding, is placed in Muffle furnace, with 2
othe speed of C/ minute is warmed up to 500
oc, and in 500
obe incubated 3 hours under C, naturally after cooling, obtain zinc-magnesium indium composite oxides about 4.67 parts.Get 1 part, being put in 2000 parts of concentration 20mg/L methyl orange solutions, in the dark adsorption reaction 3 hours, is 15.1% to the eliminating rate of absorption of methyl orange.Get 1 part, put in 2000 parts of concentration 20mg/L methyl orange solutions, under the condition of near infrared light, almost do not have photocatalytic Degradation to methyl orange, react 3 hours, methyl orange degradation rate is only 19.8%.Get 1 part, put in 2000 parts of concentration 20mg/L methyl orange solutions, under visible light illumination, have good photocatalytic Degradation to methyl orange, react 3 hours, methyl orange clearance can reach 70.9%.Get 1 part, put in 2000 parts of concentration 20mg/L methyl orange solutions, under UV Light is penetrated, react 3 hours, methyl orange clearance can reach 40.4%.
comparative example 3
Table 1
| Zn(NO 3) 2?6H 2O | Mg(NO 3) 2?6H 2O | In(NO 3) 3 | Mol ratio | |
| Comparative example 3-1 | 8.93 part | 7.7 part | 3 parts | 3：3:1 |
| Comparative example 3-2 | 8.93 part | 5.13 part | 6 parts | 3:2:2 |
| Comparative example 3-3 | 8.93 part | 10.26 parts | 9 parts | 3:4:3 |
The proportioning of employing table 1 prepares mixing salt solution respectively, other operations with embodiment 1, obtain respectively contrast product zinc-copper indium compound oxide photocatalyst about part 5.04 parts, about 6.03 parts, about 8.22 parts.Get 1 part respectively, put in 2000 parts of concentration 20mg/L methyl orange solutions, adsorption reaction 3 hours, is respectively 43.3%(comparative example 3-1 to the eliminating rate of absorption of methyl orange in the dark), 37.2%(comparative example 3-2), 55.6%(comparative example 3-3).Get 1 part respectively, put in 2000 parts of concentration 40mg/L methyl orange solutions, can not the degraded of obviously catalysis methyl orange under the condition of near infrared light, react 3 hours, methyl orange degradation rate is only respectively 54.1%(comparative example 3-1), 42.5%(comparative example 3-2), 59.4%(comparative example 3-3).Get 1 part respectively, put in 2000 parts of concentration 40mg/L methyl orange solutions, under visible light illumination, react 3 hours, methyl orange clearance is respectively 57.3%(comparative example 3-1), 50.8%(comparative example 3-2), 67.7%(comparative example 3-3).Get 1 part respectively, put in 2000 parts of concentration 40mg/L methyl orange solutions, under UV Light is penetrated, react 3 hours, methyl orange clearance is respectively 90.3(comparative example 3-1), 89.6%(comparative example 3-2), 91.1%(comparative example 3-3).
Claims (10)
1. have zinc-magnesium indium composite oxides near infrared light catalytic activity, its chemical structural formula is: Zn
3mg
3in
2o
9.
2. zinc-magnesium indium composite oxides according to claim 1, is characterized in that, in irregular laminated structure, and particle diameter 50-200nm.
3. a preparation method for zinc-magnesium indium composite oxides described in claim 1 or 2, it is characterized in that, it comprises the following steps:
(1) preparation contains the nitrate solution of zinc ion, magnesium ion, indium ion in proportion; NaOH and sodium carbonate are dissolved in the water by the mol ratio of 3:1, form mixed ammonium/alkali solutions;
(2) under agitation by nitrate solution and mixed ammonium/alkali solutions mixing, control reactant mixture pH between 10-11, form coprecipitate colloid; Stir coprecipitate colloid to disperse to it, be warming up to 55
oc, then stir 3 hours, cool to room temperature, taking precipitate; Wash sediment with water to neutral, then in 55
oc vacuum drying is also ground, then is placed in Muffle furnace in 400-600
o3 hours are processed under C.
4. preparation method according to claim 3, is characterized in that, pH is 10.5, and the temperature in Muffle furnace is 500
oc.
5. according to the preparation method of claim 3 or 4, it is characterized in that, the concrete operations of step (2) are as follows:
Under agitation nitrate solution and mixed ammonium/alkali solutions are added drop-wise in reactor simultaneously, control reactant mixture pH, form coprecipitate colloid;
High degree of agitation coprecipitate colloid, is uniformly dispersed completely to it, is then warming up to 55 DEG C, slight stirring 3 hours, naturally cools to room temperature and leaves standstill 12h, taking precipitate;
Grind in 55 DEG C of vacuum drying after washing sediment to neutrality with water, to be then placed in Muffle furnace process 3 hours.
6. zinc-magnesium indium composite oxides described in a claim 1 or 2 under near infrared light, ultraviolet light and radiation of visible light condition as the application of photocatalytic degradation catalysts.
7. application according to claim 6, is characterized in that, under near infrared light condition, as the application of photocatalytic degradation catalysts.
8. the application according to claim 6 or 7, is characterized in that, described photocatalytic degradation reacts for the photocatalytic degradation of organic pollution reacts.
9. application according to claim 8, is characterized in that, the photocatalytic degradation of described organic pollutants reacts for the photocatalytic degradation of methyl orange reacts.
10. application according to claim 9, is characterized in that,
Described ultraviolet light is provided by the medium pressure mercury lamp of 300W;
Describedly can will see that light provides by pressing xenon lamp in 300W;
Described near infrared light filters wavelength for providing after 200nm-780nm light by the infrared lamp light source filter plate of 275W.
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| CN114029064B (en) * | 2021-11-30 | 2023-08-18 | 内蒙古鄂尔多斯电力冶金集团股份有限公司 | Preparation method and application of superhydrophobic porous copper indium catalyst |
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