AU2020103225A4 - A method for preparing a composite photocatalyst by using titanium dioxide to adhere to red brick granules - Google Patents
A method for preparing a composite photocatalyst by using titanium dioxide to adhere to red brick granules Download PDFInfo
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- AU2020103225A4 AU2020103225A4 AU2020103225A AU2020103225A AU2020103225A4 AU 2020103225 A4 AU2020103225 A4 AU 2020103225A4 AU 2020103225 A AU2020103225 A AU 2020103225A AU 2020103225 A AU2020103225 A AU 2020103225A AU 2020103225 A4 AU2020103225 A4 AU 2020103225A4
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- titanium dioxide
- red brick
- sol
- brick granules
- granules
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- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 title claims abstract description 82
- 239000011449 brick Substances 0.000 title claims abstract description 52
- 239000008187 granular material Substances 0.000 title claims abstract description 41
- 239000004408 titanium dioxide Substances 0.000 title claims abstract description 41
- 239000011941 photocatalyst Substances 0.000 title claims abstract description 30
- 239000002131 composite material Substances 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 238000003756 stirring Methods 0.000 claims abstract description 8
- 238000001035 drying Methods 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 230000032683 aging Effects 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims abstract description 3
- 230000010355 oscillation Effects 0.000 claims abstract description 3
- 238000005406 washing Methods 0.000 claims abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- 239000002957 persistent organic pollutant Substances 0.000 abstract description 2
- 238000013033 photocatalytic degradation reaction Methods 0.000 abstract description 2
- 230000002195 synergetic effect Effects 0.000 abstract 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 56
- 239000002699 waste material Substances 0.000 description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 238000010276 construction Methods 0.000 description 8
- 230000015556 catabolic process Effects 0.000 description 7
- 238000006731 degradation reaction Methods 0.000 description 7
- 239000007789 gas Substances 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 3
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 229910002089 NOx Inorganic materials 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000013032 photocatalytic reaction Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007146 photocatalysis Methods 0.000 description 1
- 230000001699 photocatalysis Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 208000023504 respiratory system disease Diseases 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000001338 self-assembly Methods 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 238000003980 solgel method Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
- B01J21/063—Titanium; Oxides or hydroxides thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- 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
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8628—Processes characterised by a specific catalyst
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/39—Photocatalytic properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/40—Catalysts, in general, characterised by their form or physical properties characterised by dimensions, e.g. grain size
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0236—Drying, e.g. preparing a suspension, adding a soluble salt and drying
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/207—Transition metals
- B01D2255/20707—Titanium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/80—Type of catalytic reaction
- B01D2255/802—Photocatalytic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
- B01D2257/404—Nitrogen oxides other than dinitrogen oxide
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Catalysts (AREA)
Abstract
The invention relates to a method for preparing a composite photocatalyst by using titanium dioxide to
adhere to red brick granules. The method comprises the following steps: (1) dissolving nanosizedsized
titanium dioxide P25 into water to get the solution, and then stirring the solution under the action of
ultrasonic oscillation to obtain a relatively stable titanium dioxide sol, wherein the proportion of the
nanosizedsized titanium dioxide is 1%; (2) stirring the stable sol and adding red brick granules with pure
surfaces into the sol slowly at the same time to enable the red brick granules to contact the titanium
dioxide sol sufficiently so as to obtain a mixture A; (3) aging the mixture A for 24 hours to enable the red
brick granules in the sol to absorb the nanosized titanium dioxide sufficiently; and (4) washing, drying,
and heating to 500-800 °C, thereby obtaining the composite photocatalyst with the titanium dioxide
adhering to the red brick granules. By adopting the method, the photocatalytic degradation property of the
photocatalyst upon oxynitride and other organic pollutant substances is greatly improved, and a
remarkable synergetic function is achieved.
Description
[0001] The present invention pertains to the field of inorganic material preparation technology, and in
particular relates to a method for preparing a composite photocatalyst by using titanium dioxide to adhere
to red brick granules.
[0002] Red brick granules are the granular construction waste generated by crushing and screening red
bricks. In China, 70% of the construction waste is red bricks and the amount of the construction waste is
nearly 1.5 billion tons in one year (2014). It means that nearly 1.05 billion tons of red brick granules are
generated every year. If such a large amount of construction waste bricks are improperly disposed of, they
will not only encroach on precious land resources (every 10,000 tons of construction waste occupy about
1 mu of land to backfill), but also greatly pollute the local water sources. It does great harm to human
health and the sustainable development of society. However, the current utilization efficiency and
utilization level of the construction waste red bricks are very low. On the one hand, the added value of red
bricks utilization is quite low; on the other hand, the cost of red bricks utilization is high. In fact, if
reusing construction waste bricks to make new red bricks, the cost is even higher than ordinary red bricks
on the market. Therefore, in order to reuse the waste red bricks on a large scale, it is necessary to
effectively increase the added value of the waste red brick products.
[0003] At the same time, nitrogen oxides are important component of air pollution. The nitrogen oxides
come from the use of mineral fuel and vehicle emission. They mainly includ nitric oxide and nitrogen
dioxide. These nitrogen oxides cause many notorious negative effects, such as Ozone pollution, acid rain,
global warming, human respiratory diseases and so on. Therefore, people try to use photocatalysts to
remove nitrogen oxides. Although there are many kinds of photocatalysts, titanium dioxide has been
proved to be better and is widely used because of its stable chemical property. The nanosized-phase
titanium dioxide has been proved to have extremely high catalytic activity because of its large specific surface area. Therefore, the nanosized-phase titanium dioxide has been widely studied as a photocatalyst to alleviate urban pollution, especially nitrogen oxide pollution. However, the nanosized-phase titanium dioxide is too small, which severely limits its application scope and effectiveness.
[0004] Therefore, if the nanosized-phase titanium dioxide adheres to the surface of the red brick granules, the porous structure of red brick granules can fix the titanium dioxide so that the loss rate of the
catalyst can be effectively reduced. The strong adsorption and large specific surface area of the red brick
granules can effectively increase the contact area between the photocatalyst and the nitrogen oxide
compound pollutants and adsorb more organic pollutants on the surface. Then, the pollutants can be
degraded into non-polluting small molecules through photocatalysis and finally removed by rain. At
present, it has been reported that there is a chemical self-assembly technology to prepare a composite
photocatalyst with the nanosized titanium dioxide adhering to red brick granules. The present invention
uses a sol-gel method to prepare such composite photocatalyst.
[0005] The present invention provides a method to prepare a composite photocatalyst by using titanium dioxide to adhere to red brick granules.
[0006] The technical aspect of the present invention is as follows:
[0007] A method for preparing a composite photocatalyst by using titanium dioxide to adhere to red brick granules, comprises the following steps:
(1) Dissolving nanosized titanium dioxide P25 into water to get the solution, and then stirring the
solution under the action of ultrasonic oscillation to obtain a relatively stable titanium dioxide sol,
wherein the proportion of the nanosized titanium dioxide is 1%;
(2) Stirring the stable sol and adding the red brick granules with pure surfaces into the sol slowly at the
same time to enable the red brick granules to contact the titanium dioxide sol sufficiently so as to obtain a
mixture A;
(3) Aging the mixture A for 24 hours to enable the red brick granules in the sol to absorb the nanosized
titanium dioxide sufficiently;
(4) Washing, drying, and heating the mixture A to 500-800 °C, thereby obtaining the composite
photocatalyst with the titanium dioxide adhering to the red brick granules.
[00081 As further defined, the mass ratio of the red brick granules to the sol in the step(2) is 0.8:1.
[0009] As further defined, the way of dying in the step(4) can be using the ordinary oven or vacuum
dryer.
[0010] As further defined, the grading of the red brick granules adding into the sol in the step(2) is
.6-1 .18mm orl .18-2 .36mm.
[0011] The present invention has the following advantages: The present invention use Degussa P25 as
catalyst and red brick granules as the carrier. The size of the composite photocatalyst is about
.6-2 .36mm. The nanosized titanium dioxide distributes evenly in the surface of the red brick granules.
This method can not only improve the added value of the waste red brick granules but can also solve the
problem of dispose the waste red bricks. Meanwhile, the porousness and strong adsorption capacity of the
red brick granules make the photocatalytic degradation ability of photocatalyst more stronger. In
particular, the source of raw materials of the invention is easy to find, among which the construction
waste red brick granules can be obtained from the specialized building resource utilization factory and the
nanosized titanium dioxide can be easily purchased in the market. The method mentioned in the present
invention costs low and manufacture easily.
[00121 The technical solution and implementation of the present invention will be described in detail
hereafter with reference to accompanying examples, but the present invention is not limited to the
embodiments described hereafter.
[0013] The determination of the degradation efficiency of nitrogen oxides by using photocatalysts
follows a specific calculation formula:
'f r[~ 0[Njd 0 22.4 (t+60)x A x1000 (t+60)xAx1000
[0014] Herein, 0 represents the catalytic efficiency, that is, the degradation rate of nitrogen oxides
(pmol/hm 2); N represents the amount of nitrogen oxides (the sum of nitric oxide and nitrogen dioxide)
degraded by the test sample; [NOx]0 represents the concentration of nitrogen oxides entered (ppm); [NOx]
represents the discharge concentration of nitrogen oxides excreted (ppm); t represents the time for the
catalytic reaction (min); f represents the gas flow rate (L/min) in the standard state (0°C, 1.013kPa) ; A
represents the area of the sample involved in the reaction (mxm).
[00151 Taking nitrogen oxide (NO+NO2) as the target pollutant, the degradation efficiency is measured
by the nitrogen oxide degradation efficiency tester. First, passing standard nitric oxide gas at one end of
the gas inlet of the tester and passing zero-grade air at the other end. The source of nitric oxide is a
compressed air tank using nitrogen as the balance gas. The humidity in the tester can be controlled by
passing zero-grade air through a water bath. In this test, the humidity is controlled to 10%. In addition, the
initial concentration of the nitric oxide in the tester is controlled at 1000 ppb, and the flow rate is
controlled at 6L per minute by a flow rate controller. After about half an hour, the concentration of the
nitric oxide in the tester reaches equilibrium. At this time, turning on a ultraviolet lamp above the tester to
activate the composite photocatalyst in order to begin the photocatalytic reaction. During the reaction, a
nitric oxide analyzer measures the concentration of nitric oxide in the tester. After one hour, turning off
the ultraviolet lamp above the tester to end the photocatalytic reaction, but still passing the zero-grade air
for half an hour. Then, the computer connecting to the tester derives data. Based on the data, the nitrogen
oxides degradation efficiency is calculated through the calculation formula.
Example 1
[0016] The method for preparing a composite photocatalyst by using titanium dioxide to adhere to red
brick granules in this example includes the detailed steps: Dissolving Ig of nanosized titanium dioxide
in 100ml of water to make a sol; After ultrasonic vibration for 1 hour, adding 80g of red brick granules
with a gradation of 1 .18-2 .36mm while stirring; Aging for 24 hours, cleaning and drying it at 500°C.
After drying, a composite photocatalyst is prepared. By using the photocatalyst, the degradation rate of
nitrogen oxide compounds can reach 219 .9.
Example 2
[0017] The method for preparing a composite photocatalyst by using titanium dioxide to adhere to red
brick granules in this example includes the detailed steps: Dissolving Ig of nanosized titanium dioxide
in 100ml of water to make a sol; After ultrasonic vibration for 1 hour, adding 80g of red brick granules
with a gradation of 0.6-1.18mm while stirring; Aging for 24 hours, cleaning and drying it at 500°C. After
drying, a composite photocatalyst is prepared. By using the photocatalyst, the degradation rate of nitrogen
oxide compounds can reach 222.8.
[0018] Other features, advantages and embodiments of the invention disclosed herein will be readily
apparent to those exercising ordinary skill after reading the foregoing disclosures. In this regard, while
specific embodiments of the invention have been described in considerable detail, variations and
modifications of these embodiments can be effected without departing from the spirit and scope of the
invention as described and claimed.
Claims (4)
1. A method for preparing a composite photocatalyst by using titanium dioxide to adhere to red brick
granules, comprises the following steps:
(1) Dissolving nanosized titanium dioxide P25 into water to get the solution, and then stirring the solution
under the action of ultrasonic oscillation to obtain a relatively stable titanium dioxide sol, wherein the
proportion of the nanosized titanium dioxide is 1%;
(2) Stirring the stable sol and adding the red brick granules with pure surfaces into the sol slowly at the
same time to enable the red brick granules to contact the titanium dioxide sol sufficiently so as to obtain a
mixture A;
(3) Aging the mixture A for 24 hours to enable the red brick granules in the sol to absorb the nanosized
titanium dioxide sufficiently;
(4) Washing, drying, and heating the mixture A to 500-800 °C, thereby obtaining the composite
photocatalyst with the titanium dioxide adhering to the red brick granules.
2. The method for preparing a composite photocatalyst by using titanium dioxide to adhere to red brick
granules according to claim 1, wherein the mass ratio of the red brick granules to the sol in the step(2) is
0.8:1.
3. The method for preparing a composite photocatalyst by using titanium dioxide to adhere to red brick
granules according to claim 1, wherein the way of dying in the step(4) can be using the ordinary oven or
vacuum dryer.
4. The method for preparing a composite photocatalyst by using titanium dioxide to adhere to red brick
granules according to claim 1, wherein the grading of the red brick granules adding into the sol in the
step(2) is 0 .6-1 .18mm orl .18-2.36mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2020103225A AU2020103225A4 (en) | 2020-11-04 | 2020-11-04 | A method for preparing a composite photocatalyst by using titanium dioxide to adhere to red brick granules |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2020103225A AU2020103225A4 (en) | 2020-11-04 | 2020-11-04 | A method for preparing a composite photocatalyst by using titanium dioxide to adhere to red brick granules |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2020103225A4 true AU2020103225A4 (en) | 2021-01-14 |
Family
ID=74103475
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2020103225A Ceased AU2020103225A4 (en) | 2020-11-04 | 2020-11-04 | A method for preparing a composite photocatalyst by using titanium dioxide to adhere to red brick granules |
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| Country | Link |
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| AU (1) | AU2020103225A4 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114873957A (en) * | 2022-05-10 | 2022-08-09 | 福建工程学院 | Waterproof and antibacterial environment-friendly slag soil brick and preparation method thereof |
| CN116059966A (en) * | 2023-02-20 | 2023-05-05 | 中国科学院生态环境研究中心 | Biochar prepared by combining biology and red brick solid waste, and preparation method and application thereof |
-
2020
- 2020-11-04 AU AU2020103225A patent/AU2020103225A4/en not_active Ceased
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114873957A (en) * | 2022-05-10 | 2022-08-09 | 福建工程学院 | Waterproof and antibacterial environment-friendly slag soil brick and preparation method thereof |
| CN114873957B (en) * | 2022-05-10 | 2023-04-07 | 福建工程学院 | Waterproof and antibacterial environment-friendly slag soil brick and preparation method thereof |
| CN116059966A (en) * | 2023-02-20 | 2023-05-05 | 中国科学院生态环境研究中心 | Biochar prepared by combining biology and red brick solid waste, and preparation method and application thereof |
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