CN111185178B - Preparation method of carbon quantum dot modified denitration catalyst - Google Patents
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- B01D53/00—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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
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Abstract
The invention discloses a preparation method of a carbon quantum dot modified denitration catalyst, and relates to a preparation method of a denitration catalyst. The technical problem that the low-temperature activity of the existing denitration catalyst is poor is solved. The method comprises the following steps: 1. preparing carbon quantum dots; 2. adding the carbon quantum dots, the metal salt and the titanium dioxide into deionized water, ultrasonically dispersing, heating, stirring, and evaporating to dryness to obtain a solid; 3. and calcining to obtain the carbon quantum dot modified denitration catalyst. The denitration efficiency of the denitration catalyst is 90-94% at a low temperature of 150-200 ℃, and the denitration efficiency is 90-96% at a temperature of 250-300 ℃. Can be used in the field of flue gas treatment.
Description
Technical Field
The invention relates to a preparation method of a denitration catalyst.
Background
Nitrogen Oxides (NO) x ) Is a main atmospheric pollutant, and the emission of the main atmospheric pollutant can cause the problems of acid rain, photochemical smog and the like, thereby bringing great harm to the ecological environment and human health. The Selective Catalytic Reduction (SCR) technology is the most efficient technology for treating nitrogen oxides in flue gas at present. The core technology of SCR lies in the denitration catalyst, and the current mainstream commercial SCR catalyst is a vanadium-titanium composite metal oxide, such as: v 2 O 5 /TiO 2 ，V 2 O 5 /WO 3 -TiO 2 However, the vanadium-titanium composite metal oxide has the defects of poor low-temperature activity, high wear rate, narrow active temperature window range and the like, so that the development reaction temperature window is wider, and water is usedThe composite metal oxide denitration catalyst with thermal stability and no toxicity and green color has important practical significance and good application prospect.
Carbon quantum dots (CQDs, C-dots or CDs) are novel carbon nano materials, have the size of less than 10nm, have excellent performances of good water solubility, chemical inertness, low toxicity, easy functionalization, photobleaching resistance, light stability and the like, are more and more concerned by people, and are widely applied to the fields of biomedicine, photocatalysis, photoelectron, sensing and the like.
Article "microwave preparation of V-Mn/TiO" published by boiler technology at No. 2, volume 45, 3 months, 2014 2 Denitration catalyst and performance research "adopts the impregnation method to prepare titanium dioxide load type manganese vanadium composite oxide SCR denitration catalyst, has improved the low temperature SCR denitration activity of composite catalyst, but the activity of this catalyst still needs to be improved under the low temperature condition.
Disclosure of Invention
The invention provides a preparation method of a carbon quantum dot modified denitration catalyst, aiming at solving the technical problem of poor low-temperature activity of the existing denitration catalyst.
The preparation method of the carbon quantum dot modified denitration catalyst comprises the following steps:
1. preparing the carbon quantum dots: dissolving a carbon source in deionized water, adding urea, stirring and dissolving to obtain a solution; putting the solution into a normal-pressure microwave synthesis extraction reactor, performing microwave reaction for 5-15 min under the conditions of microwave power of 600-1000W and temperature of 60-120 ℃ to obtain bulk solids, and drying to obtain carbon quantum dots;
2. weighing carbon quantum dots, metal salt and titanium dioxide, adding the carbon quantum dots and the metal salt into deionized water for ultrasonic dispersion, adding the titanium dioxide, heating and stirring to evaporate the mixed solution until the water is evaporated to obtain a solid;
3. and (4) drying and grinding the solid obtained in the step two, and calcining the solid in a nitrogen atmosphere to obtain the carbon quantum dot modified denitration catalyst.
The invention adopts carbon quantum dots, metal salt and titanium dioxide to prepare the denitration catalystThe content of carbon quantum dots in the denitration catalyst is 2-10%, the content of metal oxides is 1-6%, and TiO is 2 The content is 84-97%. The denitration catalyst is modified by utilizing the carbon quantum dots, and the addition of the carbon quantum dots enables the denitration catalyst to have higher electron transmission efficiency, so that electrons in metal, NO and NH are accelerated 3 Improve NO and NH of the denitration catalyst 3 The adsorption performance and the internal electron transfer rate, thereby improving the low-temperature catalytic activity and improving the removal efficiency of NO in the flue gas.
The carbon quantum dot modified denitration catalyst has a large specific surface area and better adsorption performance. The denitration efficiency of the denitration catalyst is 90-94% at a low temperature of 150-200 ℃, and the denitration efficiency is 90-96% at a temperature of 250-300 ℃.
Can be used as a denitration catalyst for the field of flue gas treatment.
Drawings
Fig. 1 is an SEM photograph of a carbon quantum dot modified denitration catalyst prepared in example 1;
fig. 2 is an XRD spectrum of the carbon quantum dot modified denitration catalysts prepared in examples 1, 2, 3 and 4;
FIG. 3 is N of carbon quantum dot modified denitration catalysts prepared in examples 1, 2, 3, 4, 5 and 6 2 Adsorption desorption isotherm diagram.
Detailed Description
The first specific implementation way is as follows: the preparation method of the carbon quantum dot modified denitration catalyst of the embodiment comprises the following steps:
1. preparing the carbon quantum dots: dissolving a carbon source in deionized water, adding urea, stirring and dissolving to obtain a solution; putting the solution into a normal-pressure microwave synthesis extraction reactor, performing microwave reaction for 5-15 min under the conditions of microwave power of 600-1000W and temperature of 60-120 ℃ to obtain dark brown bulk solid, and drying to obtain carbon quantum dots;
2. weighing carbon quantum dots, metal salt and titanium dioxide, adding the carbon quantum dots and the metal salt into deionized water, performing ultrasonic dispersion, adding the titanium dioxide, heating and stirring to evaporate the mixed solution until the water is evaporated to obtain a solid;
3. and (4) drying and grinding the solid obtained in the step two, and calcining the solid in a nitrogen atmosphere to obtain the carbon quantum dot modified denitration catalyst.
The second embodiment is as follows: the difference between the first embodiment and the second embodiment is that the carbon source in the first step is corn straw, citric acid, glucose, sucrose or glycerol; the rest is the same as the first embodiment.
The third concrete implementation mode: the embodiment is different from the first embodiment or the second embodiment in that the mass ratio of the carbon quantum dots, the metal salt and the titanium dioxide in the second step is 1: (0.82 to 4.1): (42.5 to 47.5); the other is the same as in the first or second embodiment.
The fourth concrete implementation mode is as follows: the difference between this embodiment and one of the first to third embodiments is that the metal salt in the second step is one or more of cerium nitrate, nickel chloride, zinc nitrate, ferric nitrate, manganese acetate, and lanthanum nitrate; the others are the same as in one of the first to third embodiments.
The fifth concrete implementation mode is as follows: the difference between the embodiment and one of the first to the fourth embodiments is that the titanium dioxide in the second step is anatase phase, and the specific surface area is 75-85 m 2 (ii)/g; the other is the same as one of the first to fourth embodiments.
In the embodiment, anatase phase titanium dioxide is adopted to ensure the catalytic activity, and the specific surface area is 75-85 m 2 The effective contact area in the reaction process can be ensured in the range of/g.
The sixth specific implementation mode is as follows: the difference between the present embodiment and the first to the fifth embodiment is the heating in the second step, wherein the temperature is 80-100 ℃; the other is the same as one of the first to fifth embodiments.
The seventh embodiment: the difference between the embodiment and one of the first to sixth embodiments is that the solid in the second step has a moisture content of less than 0.5% by mass; the other is the same as one of the first to sixth embodiments.
The specific implementation mode is eight: the difference between the embodiment and one of the first to seventh embodiments is the calcination in the third step, wherein the calcination temperature is 400-550 ℃, and the calcination time is 4-6 hours; the other is the same as one of the first to seventh embodiments.
The following examples are used to demonstrate the beneficial effects of the present invention:
example 1: the preparation method of the carbon quantum dot modified denitration catalyst of the embodiment comprises the following steps:
1. preparing the carbon quantum dots: dissolving 60g of citric acid in 500mL of deionized water, adding 60g of urea, stirring and dissolving to obtain a solution; then putting the solution into a normal-pressure microwave synthesis extraction reactor, carrying out microwave reaction for 5min under the conditions of microwave power of 800W and temperature of 70 ℃, gradually changing the solution from colorless to light yellow, and drying for 1h at 60 ℃ to obtain dark brown solid, namely the carbon quantum dots;
2. 0.1g of carbon quantum dots, 2.5g of cerium nitrate and 8.9g of specific surface area of 80m are weighed 2 Adding carbon quantum dots and cerium nitrate into 200mL of deionized water for ultrasonic dispersion, adding the titanium dioxide, heating to 80 ℃, stirring, slowly evaporating the mixed solution until the water is evaporated to dryness, and obtaining solid, wherein the mass percentage of the water in the solid is 0.4%;
3. and (3) drying the solid obtained in the third step at the temperature of 80 ℃ for 12 hours, grinding, and calcining for 4 hours in a nitrogen atmosphere at the temperature of 450 ℃ to obtain the carbon quantum dot modified denitration catalyst.
The content of carbon quantum dots in the catalyst prepared in this example was 1%, the content of cerium oxide was 10%, and the content of titanium dioxide was 89%.
Example 2: the preparation method of the carbon quantum dot modified denitration catalyst of the embodiment comprises the following steps:
1. preparing the carbon quantum dots: dissolving 50g of citric acid in 400mL of deionized water, adding 50g of urea, stirring and dissolving to obtain a solution; then placing the solution into a normal pressure microwave synthesis extraction reaction instrument, carrying out microwave reaction for 5min under the conditions of the microwave power of 800W and the temperature of 70 ℃, gradually changing the solution from colorless to light yellow, and drying for 1h at 70 ℃ to obtain dark brown solid, namely the carbon quantum dots;
2. 0.3g of carbon was weighedQuantum dots, 2.50g of cerium nitrate and 8.7g of specific surface area of 80m 2 Firstly, adding carbon quantum dots and cerium nitrate into 200mL of deionized water for ultrasonic dispersion, then adding the titanium dioxide, heating to 80 ℃, stirring, slowly evaporating the mixed solution until the water is evaporated to dryness, and obtaining a solid; the mass percentage of water content of the solid is 0.4%;
3. and (3) drying the solid obtained in the step three at the temperature of 80 ℃ for 14 hours, grinding, and calcining at the temperature of 500 ℃ for 4 hours in a nitrogen atmosphere to obtain the carbon quantum dot modified denitration catalyst.
The content of carbon quantum dots in the catalyst prepared in this example was 3%, the content of cerium oxide was 10%, and the content of titanium dioxide was 87%.
Example 3: the preparation method of the carbon quantum dot modified denitration catalyst of the embodiment comprises the following steps:
1. preparing the carbon quantum dots: dissolving 55g of citric acid in 350mL of deionized water, adding 55g of urea, stirring and dissolving to obtain a solution; then putting the solution into a normal-pressure microwave synthesis extraction reactor, carrying out microwave reaction for 6min under the conditions of microwave power of 800W and temperature of 80 ℃, gradually changing the solution from colorless to light yellow, and drying for 1h at 70 ℃ to obtain dark brown solid, namely the carbon quantum dots;
2. 0.5g of carbon quantum dots, 2.50g of cerium nitrate and 8.7g of cerium nitrate are weighed, and the specific surface area is 80m 2 Firstly, adding carbon quantum dots and cerium nitrate into 200mL of deionized water for ultrasonic dispersion, then adding the titanium dioxide, heating to 80 ℃, stirring, slowly evaporating the mixed solution until the water is evaporated to dryness, and obtaining a solid; the mass percentage of water content of the solid is 0.4%;
3. and (3) drying the solid obtained in the step three at the temperature of 80 ℃ for 12 hours, grinding, and calcining for 5 hours in a nitrogen atmosphere at the temperature of 450 ℃ to obtain the carbon quantum dot modified denitration catalyst.
The content of carbon quantum dots in the catalyst prepared in this example is 5%, the content of cerium oxide is 10%, and the content of titanium dioxide is 85%.
Example 4: the preparation method of the carbon quantum dot modified denitration catalyst of the embodiment comprises the following steps:
1. preparing the carbon quantum dots: dissolving 60g of citric acid in 40mL of deionized water, adding 60g of urea, stirring and dissolving to obtain a solution; then putting the solution into a normal-pressure microwave synthesis extraction reactor, carrying out microwave reaction for 5min under the conditions of microwave power of 700W and temperature of 70 ℃, gradually changing the solution from colorless to light yellow, and drying for 1h at 80 ℃ to obtain dark brown solid, namely the carbon quantum dots;
2. 0.7g of carbon quantum dots, 2.50g of cerium nitrate and 8.3g g are weighed, and the specific surface area is 80m 2 Firstly, adding carbon quantum dots and cerium nitrate into 200mL of deionized water for ultrasonic dispersion, then adding the titanium dioxide, heating to 80 ℃, stirring, slowly evaporating the mixed solution until the water is evaporated to dryness, and obtaining a solid; the mass percentage of water content of the solid is 0.35 percent;
3. and (4) drying the solid obtained in the step three at the temperature of 80 ℃ for 10 hours, grinding, and calcining for 4 hours in a nitrogen atmosphere at the temperature of 550 ℃ to obtain the carbon quantum dot modified denitration catalyst.
The catalyst prepared in this example contains 7% of carbon quantum dots, 10% of cerium oxide, and 83% of titanium dioxide.
Example 5: the preparation method of the carbon quantum dot modified denitration catalyst of the embodiment comprises the following steps:
1. preparing the carbon quantum dots: dissolving 56.25g of glucose in 300mL of deionized water, adding 60g of urea, stirring and dissolving to obtain a solution; then putting the solution into a normal-pressure microwave synthesis extraction reactor, carrying out microwave reaction for 8min under the conditions of microwave power of 500W and temperature of 60 ℃, gradually changing the solution from colorless to light yellow, and drying for 1h at 60 ℃ to obtain dark brown solid, namely the carbon quantum dots;
2. 0.5g of carbon quantum dots, 2.50g of cerium nitrate and 8.5g of specific surface area of 80m are weighed 2 Firstly, adding carbon quantum dots and cerium nitrate into 200mL of deionized water for ultrasonic dispersion, then adding the titanium dioxide, heating to 80 ℃, stirring, slowly evaporating the mixed solution until the water is evaporated to dryness, and obtaining a solid; water content of solidThe amount was 0.45%;
3. and (4) drying the solid obtained in the step three at 80 ℃ for 12 hours, grinding, and calcining at 500 ℃ for 4 hours in a nitrogen atmosphere to obtain the carbon quantum dot modified denitration catalyst.
The content of carbon quantum dots in the catalyst prepared in this example is 5%, the content of cerium oxide is 10%, and the content of titanium dioxide is 85%.
Example 6: the preparation method of the carbon quantum dot modified denitration catalyst of the embodiment comprises the following steps:
1. preparing the carbon quantum dots: dissolving 53.1g of sucrose in 300mL of deionized water, adding 70.0g of urea, stirring and dissolving to obtain a solution; then putting the solution into a normal-pressure microwave synthesis extraction reactor, carrying out microwave reaction for 5min under the conditions of microwave power of 700W and temperature of 80 ℃, gradually changing the solution from colorless to light yellow, and drying for 1h at 60 ℃ to obtain dark brown solid, namely the carbon quantum dots;
2. 0.5g of carbon quantum dots, 2.50g of cerium nitrate and 8.5g of cerium nitrate are weighed, and the specific surface area is 80m 2 Firstly, adding carbon quantum dots and cerium nitrate into 200mL of deionized water for ultrasonic dispersion, then adding the titanium dioxide, heating to 80 ℃, stirring, slowly evaporating the mixed solution until the water is evaporated to dryness, and obtaining a solid; the mass percentage of water content of the solid is 0.4%;
3. and (3) drying the solid obtained in the step three at 80 ℃ for 12 hours, grinding, and calcining at 450 ℃ for 4 hours in a nitrogen atmosphere to obtain the carbon quantum dot modified denitration catalyst.
The content of carbon quantum dots in the catalyst prepared in this example is 5%, the content of cerium oxide is 10%, and the content of titanium dioxide is 85%.
Example 7: the preparation method of the carbon quantum dot modified denitration catalyst of the embodiment comprises the following steps:
1. preparing the carbon quantum dots: dissolving 50g of citric acid in 300mL of deionized water, adding 50g of urea, stirring and dissolving to obtain a solution; then putting the solution into a normal-pressure microwave synthesis extraction reactor, carrying out microwave reaction for 10min under the conditions of microwave power of 500W and temperature of 60 ℃, gradually changing the solution from colorless to light yellow, and drying for 1h at 80 ℃ to obtain dark brown solid, namely the carbon quantum dots;
2. 0.5g of carbon quantum dots, 1.74g of nickel chloride and 8.5g of specific surface area 80m were weighed 2 Adding carbon quantum dots and cerium nitrate into 200mL of deionized water for ultrasonic dispersion, adding the titanium dioxide, heating to 80 ℃, stirring, slowly evaporating the mixed solution until the water is evaporated to dryness, and obtaining a solid; the water content of the solid is 0.42 percent by mass;
3. and (3) drying the solid obtained in the step three at 80 ℃ for 10 hours, grinding, and calcining at 450 ℃ for 3 hours in a nitrogen atmosphere to obtain the carbon quantum dot modified denitration catalyst.
In the catalyst prepared in this example, the content of the carbon quantum dots is 5%, the content of the nickel oxide is 10%, and the content of the titanium dioxide is 85%.
Example 8: the preparation method of the carbon quantum dot modified denitration catalyst of the embodiment comprises the following steps:
1. preparing the carbon quantum dots: dissolving 60g of citric acid in 400mL of deionized water, adding 60g of urea, stirring and dissolving to obtain a solution; then putting the solution into a normal-pressure microwave synthesis extraction reactor, carrying out microwave reaction for 8min under the conditions of microwave power of 800W and temperature of 70 ℃, gradually changing the solution from colorless to light yellow, and drying for 1h at 70 ℃ to obtain dark brown solid, namely the carbon quantum dots;
2. 0.5g of carbon quantum dots, 2.4g of manganese nitrate and 8.5g of specific surface area 80m were weighed 2 Firstly, adding carbon quantum dots and cerium nitrate into 200mL of deionized water for ultrasonic dispersion, then adding the titanium dioxide, heating to 80 ℃, stirring, slowly evaporating the mixed solution until the water is evaporated to dryness, and obtaining a solid; the mass percentage of water content of the solid is 0.44%;
3. and (3) drying the solid obtained in the step three at 80 ℃ for 12 hours, grinding, and calcining at 450 ℃ for 4 hours in a nitrogen atmosphere to obtain the carbon quantum dot modified denitration catalyst.
In the catalyst prepared in this example, the content of the carbon quantum dots is 5%, the content of the manganese oxide is 10%, and the content of the titanium dioxide is 85%.
Example 9: the preparation method of the carbon quantum dot modified denitration catalyst of the embodiment comprises the following steps:
1. preparing the carbon quantum dots: dissolving 60g of citric acid in 400mL of deionized water, adding 60g of urea, and stirring for dissolving to obtain a solution; then placing the solution into a normal pressure microwave synthesis extraction reactor, carrying out microwave reaction for 8min under the conditions of the microwave power of 800W and the temperature of 70 ℃, gradually changing the solution from colorless to light yellow, and drying for 1h at 70 ℃ to obtain dark brown solid, namely the carbon quantum dots;
2. 0.5g of carbon quantum dots, 1.37g of ammonium metavanadate and 8.5g of specific surface area 80m were weighed 2 Firstly, adding carbon quantum dots and cerium nitrate into 200mL of deionized water for ultrasonic dispersion, then adding the titanium dioxide, heating to 85 ℃, stirring, slowly evaporating the mixed solution until the water is evaporated to dryness, and obtaining dark brown solid; the mass percentage of water content of the solid is 0.4%;
3. and (3) drying the solid obtained in the step three at the temperature of 80 ℃ for 12 hours, grinding, and calcining for 4 hours in a nitrogen atmosphere at the calcining temperature of 500 ℃ to obtain the carbon quantum dot modified denitration catalyst.
The content of carbon quantum dots in the catalyst prepared in this example is 5%, the content of vanadium pentoxide is 10%, and the content of titanium dioxide is 85%.
Example 10: compared with example 1, the catalyst of the present example does not add carbon quantum dots. The preparation method comprises the following steps:
adding 2.50g of cerium nitrate into 200mL of deionized water, carrying out ultrasonic dispersion, adding 9.0g of cerium nitrate with the specific surface area of 80m 2 Heating the solution of anatase phase titanium dioxide to 80 ℃, stirring, slowly evaporating the mixed solution until water is evaporated to dryness to obtain a solid. Dried at 80 ℃ overnight, ground and calcined at 450 ℃ under nitrogen.
The catalyst prepared in this example had a cerium oxide content of 10% and a titanium dioxide content of 90%.
The denitration catalyst prepared in example 1 was subjected to SEM test, and the obtained SEM photograph is shown in fig. 1, and it can be seen from fig. 1 that the catalyst was formed by stacking fixed small particles having a particle size of about 0.5 μm.
The XRD patterns of the carbon quantum dot modified denitration catalysts prepared in examples 1, 2, 3 and 4 are shown in fig. 2, and it can be seen from fig. 2 that all samples show anatase characteristic diffraction peaks at 2 θ =25.3 °, 37.9 °, 48.0 °, 54.1 °, 55.0 °, 62.8 °, 68.5 °, 70.5 ° and 75.0 °, indicating that the introduction of the carbon quantum dots does not change TiO in the catalyst 2 A crystal structure.
FIG. 3 is N of carbon quantum dot modified denitration catalysts prepared in examples 1, 2, 3, 4, 5 and 6 2 Adsorption desorption isotherm diagram. As can be seen from FIG. 3, all the catalyst adsorption and desorption isotherms are of type IV, and the hysteresis loops formed by closing the isotherms are similar in type H3. The introduction of the carbon quantum dots does not change the pore channel structure of the catalyst.
The catalyst prepared in the above example was used for NH 3 In the reduction of NO denitration reaction, the actual flue gas composition is simulated: NO 20mL/min (800 ppm), NH 3 20mL/min(880ppm)、O 2 40mL/min、N 2 820mL/min, 4.0 percent of oxygen content, 1000mL/min of flue gas flow, 4mL of catalyst filling volume, 150-350 ℃ of test temperature and 15000h of test airspeed -1 And the system pressure is 0.10MPa. The denitration efficiency of the catalyst of each example is detailed in table 1.
TABLE 1 denitration efficiency of catalyst prepared in each example
As can be seen from table 1, the denitration efficiency of the catalyst in example 10 without adding carbon quantum dots is less than 80% at different temperatures, and the denitration efficiency is significantly increased with the increase of the content of the carbon quantum dots in the catalyst, and the denitration efficiency of the catalysts prepared in examples 1 to 7 can reach more than 90% at a temperature of 150 to 350 ℃, because the introduction of the carbon quantum dots in the catalyst enhances the adsorption of NO and improves the ability of electrons in the catalyst to migrate to the surface. In contrast, the catalyst containing manganese oxide prepared in example 8 and the catalyst containing vanadium pentoxide prepared in example 9 have slightly poor catalytic performance, and the denitration efficiency of NO at different temperatures of 150 to 350 ℃ is less than 90%.
Claims (5)
1. A preparation method of a carbon quantum dot modified denitration catalyst is characterized by comprising the following steps:
1. preparing the carbon quantum dots: dissolving a carbon source in deionized water, adding urea, stirring and dissolving to obtain a solution; putting the solution into a normal-pressure microwave synthesis extraction reactor, performing microwave reaction for 5-15 min under the conditions of microwave power of 600-1000W and temperature of 60-120 ℃ to obtain bulk solids, and drying to obtain carbon quantum dots;
2. weighing carbon quantum dots, metal salt and titanium dioxide, adding the carbon quantum dots and the metal salt into deionized water for ultrasonic dispersion, adding the titanium dioxide, heating and stirring at the temperature of 80-100 ℃, evaporating the mixed solution until the water is evaporated to dryness, and obtaining a solid; the titanium dioxide is anatase phase, and the specific surface area is 75-85 m 2 (ii)/g; the metal salt is one or more of cerium nitrate, nickel chloride, zinc nitrate, ferric nitrate, manganese acetate and lanthanum nitrate;
3. and (4) drying and grinding the solid obtained in the step two, and calcining the solid in the nitrogen atmosphere to obtain the carbon quantum dot modified denitration catalyst.
2. The method of claim 1, wherein the carbon source used in the first step is corn stover, citric acid, glucose, sucrose or glycerol.
3. The method for preparing a carbon quantum dot modified denitration catalyst according to claim 1 or 2, wherein the mass ratio of the carbon quantum dot, the metal salt and the titanium dioxide in the second step is 1: (0.82 to 4.1): (42.5-47.5).
4. The method according to claim 1 or 2, wherein the moisture content of the solid in the second step is less than 0.5% by mass.
5. The method for preparing a carbon quantum dot modified denitration catalyst according to claim 1 or 2, wherein the calcination is performed in the third step, the calcination temperature is 400 to 550 ℃, and the calcination time is 4 to 6 hours.
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| CN105597764A (en) * | 2016-03-09 | 2016-05-25 | 中国科学院地球环境研究所 | Preparation method of carbon quantum dot/zinc ferrite composite photocatalytic materials |
| CN106964358A (en) * | 2017-04-24 | 2017-07-21 | 常州大学 | A kind of cadmium ferrite/concave convex rod nano composite material of carbon quantum dot modification and its preparation method and application |
| CN110237834A (en) * | 2019-07-10 | 2019-09-17 | 中国科学院地球环境研究所 | A kind of preparation method of carbon quantum dot/zinc oxide visible-light-inducephotocatalyst photocatalyst |
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2020
- 2020-02-03 CN CN202010078742.1A patent/CN111185178B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105597764A (en) * | 2016-03-09 | 2016-05-25 | 中国科学院地球环境研究所 | Preparation method of carbon quantum dot/zinc ferrite composite photocatalytic materials |
| CN106964358A (en) * | 2017-04-24 | 2017-07-21 | 常州大学 | A kind of cadmium ferrite/concave convex rod nano composite material of carbon quantum dot modification and its preparation method and application |
| CN110237834A (en) * | 2019-07-10 | 2019-09-17 | 中国科学院地球环境研究所 | A kind of preparation method of carbon quantum dot/zinc oxide visible-light-inducephotocatalyst photocatalyst |
Non-Patent Citations (1)
| Title |
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| "A facile approach to synthesis carbon quantum dots-doped P25 visible-light driven photocatalyst with improved NO removal performance";Junqi Qin，et al;《Atmospheric Pollution Research》;20191105;第303-304页，表1 * |
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