CN110813268A - Titanium dioxide photocatalyst with flower-like nano structure and preparation method and application thereof - Google Patents
Titanium dioxide photocatalyst with flower-like nano structure and preparation method and application thereof Download PDFInfo
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- CN110813268A CN110813268A CN201911086712.9A CN201911086712A CN110813268A CN 110813268 A CN110813268 A CN 110813268A CN 201911086712 A CN201911086712 A CN 201911086712A CN 110813268 A CN110813268 A CN 110813268A
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- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 title claims abstract description 78
- 239000004408 titanium dioxide Substances 0.000 title claims abstract description 38
- 239000011941 photocatalyst Substances 0.000 title claims abstract description 33
- 239000002086 nanomaterial Substances 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 24
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 230000001699 photocatalysis Effects 0.000 claims abstract description 14
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 13
- 238000001027 hydrothermal synthesis Methods 0.000 claims abstract description 12
- 239000011259 mixed solution Substances 0.000 claims abstract description 12
- 239000000243 solution Substances 0.000 claims abstract description 12
- 239000008367 deionised water Substances 0.000 claims abstract description 10
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 10
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 230000003647 oxidation Effects 0.000 claims abstract description 9
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 9
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000007787 solid Substances 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims abstract description 7
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000001035 drying Methods 0.000 claims abstract description 5
- 238000001354 calcination Methods 0.000 claims abstract description 4
- 238000007789 sealing Methods 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims abstract description 4
- 238000005406 washing Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 8
- 238000005303 weighing Methods 0.000 abstract 2
- 229910052753 mercury Inorganic materials 0.000 description 12
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 6
- 239000003344 environmental pollutant Substances 0.000 description 6
- 239000003546 flue gas Substances 0.000 description 6
- 231100000719 pollutant Toxicity 0.000 description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910001385 heavy metal Inorganic materials 0.000 description 4
- 239000003245 coal Substances 0.000 description 3
- 239000010453 quartz Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000003916 acid precipitation Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000012717 electrostatic precipitator Substances 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 230000031700 light absorption Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000002070 nanowire Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 206010010305 Confusional state Diseases 0.000 description 1
- 208000000059 Dyspnea Diseases 0.000 description 1
- 206010013975 Dyspnoeas Diseases 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000809 air pollutant Substances 0.000 description 1
- 231100001243 air pollutant Toxicity 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 210000003169 central nervous system Anatomy 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
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- 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
- B01D53/8665—Removing heavy metals or compounds thereof, e.g. mercury
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- 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
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- 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
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- 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
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- 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
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
- B01J35/61—Surface area
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
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- General Chemical & Material Sciences (AREA)
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Abstract
The invention discloses a titanium dioxide photocatalyst with a flower-like nano structure and a preparation method and application thereof, wherein the preparation comprises the following steps: weighing hydrogen peroxide solution in which titanium powder is dissolved, and adding nitric acid and deionized water; continuously stirring by magnetic force under the condition of water bath to obtain a mixed solution A; weighing the mixed solution A, putting the mixed solution A into a hydrothermal reaction kettle, and adding a sodium hydroxide solution; sealing the hydrothermal reaction kettle, carrying out hydrothermal reaction in a homogeneous reactor, naturally cooling to room temperature, collecting the product, and washing with deionized water and a nitric acid solution respectively to obtain a mixture B; and drying the mixture B to obtain a solid sample, and calcining the solid sample in a muffle furnace to obtain the flower-shaped titanium dioxide photocatalyst. Compared with industrial-grade titanium dioxide, the titanium dioxide photocatalyst with the flower-like nano structure has the advantages that the photocatalytic performance is greatly improved, and the titanium dioxide photocatalyst can be applied to the field of photocatalytic oxidation of elemental mercury.
Description
Technical Field
The invention belongs to the field of titanium-based materials, and relates to a titanium dioxide photocatalyst with a flower-like nano structure, and a preparation method and application thereof.
Background
The economic development of human society cannot keep the supply of energy. Common fossil energy sources include coal, petroleum and natural gas, and the energy supply of China is mainly provided by coal. Coal is relatively complex in composition, mainly containing carbon, hydrogen, oxygen, nitrogen, sulfur and the like, and further containing very small amounts of elements such as phosphorus, fluorine, chlorine, arsenic and mercury. The combustion of coal is necessarily accompanied by the production of a large amount of air pollutants. Taking a coal-fired power plant in China as an example, flue gas at the tail of a boiler of the coal-fired power plant often contains flue gas pollutants such as sulfur dioxide, nitric oxide, dust, heavy metal pollutants and the like. The sulfur dioxide dissolved in water can form sulfurous acid, and can be further oxidized to form sulfuric acid under certain conditions, which can form acid rain and seriously harm the safety of crops and buildings. In addition, nitrogen oxides can form nitric acid and nitrate fine particles in the atmosphere, and together with sulfuric acid and sulfate fine particles, they are transported over long distances, thereby accelerating the deterioration of regional acid rain. Heavy metal mercury pollutes the human central nervous system and is easy to cause mental confusion, dyspnea and even death. These pollutants pose serious threats to the human living environment, and effective technical means are urgently needed to be developed to control the emission from the source.
Taking the heavy metal mercury pollutant as an example, the heavy metal mercury pollutant has three main forms in coal-fired flue gas: elemental mercury, oxidized mercury, and particulate mercury. The oxidized mercury is easily dissolved in water and can be jointly removed by combining a limestone-gypsum Wet Flue Gas Desulfurization (WFGD) system. The granular mercury can be captured by a traditional dust remover. The elemental mercury is the most difficult to remove because of its chemical stability and insolubility in water. The elemental mercury in the flue gas is oxidized into oxidized mercury, and then combined with the existing desulfurizing tower to carry out combined removal, thus becoming a feasible mercury removal means. In view of the high intensity of ultraviolet radiation contained in electrostatic precipitators (ESP), photocatalytic techniques may be employed to photocatalytically oxidize elemental mercury. The development of a photocatalyst with low cost and high efficiency is the core of the photocatalytic technology. Titanium dioxide (TiO)2) The photocatalyst is the most widely applied photocatalyst, and the crystal phase, the structure, the morphology and the granularity of the photocatalyst have great influence on the photocatalytic performance of the titanium dioxide. The industrial grade titanium dioxide (P25) has small specific surface area, is not beneficial to the dispersion of active sites, reduces the collision probability of the catalyst surface and target pollutants, and weakens the reaction. In contrast, the flower-like titanium dioxide photocatalyst with the nano structure has certain advantages in the aspects of basic structure and morphology, and the photocatalytic oxidation effect on elemental mercury is better than that of the common P25 powder.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the problem of poor mercury removal effect of the prior art on coal-fired flue gas, a titanium dioxide photocatalyst with a flower-shaped nano structure and a preparation method and application thereof are provided.
The invention provides a preparation method of a titanium dioxide photocatalyst with a flower-like nano structure, which is characterized by comprising the following steps of:
(1) dissolving titanium powder in 30% hydrogen peroxide solution, adding dilute nitric acid and deionized water, continuously magnetically stirring for 2 hours under the condition of 80 ℃ water bath, and naturally cooling to room temperature to obtain mixed solution A;
(2) putting the mixed solution A into a hydrothermal reaction kettle, adding a sodium hydroxide solution, sealing the hydrothermal reaction kettle, and carrying out hydrothermal reaction for 5 hours in a homogeneous reactor at the temperature of 150 ℃; naturally cooling to room temperature, collecting products, and washing with deionized water and 0.1mol/L nitric acid solution for 3 times respectively to obtain a mixture B;
(3) drying the mixture B prepared in the step (2) in an oven at the temperature of 80 ℃ for 12 hours to obtain a solid sample; and calcining the solid sample in a muffle furnace at 500 ℃ for 2h to obtain the titanium dioxide photocatalyst with the flower-like nano structure.
Preferably, the concentration of the dilute nitric acid in the step (1) is 5mol/L, and the dosage ratio of the titanium powder, the hydrogen peroxide solution, the dilute nitric acid and the deionized water is 0.1g:139mL:1.1mL:9.9 mL.
Preferably, the concentration of the sodium hydroxide solution in the step (2) is 100mol/L, and the volume ratio of the mixed solution A to the sodium hydroxide solution is 3.6: 1.
The invention also provides the titanium dioxide photocatalyst with the flower-like nano structure prepared by the method.
The invention also provides application of the titanium dioxide photocatalyst with the flower-like nano structure prepared by the method in photocatalytic oxidation of elemental mercury.
Compared with the prior art, the invention has the beneficial effects that:
the titanium dioxide photocatalyst with the flower-like nano structure can overcome the defects caused by industrial-grade titanium dioxide (P25). The specific surface area is large, the absorption of reactants is facilitated, the abundant flower-shaped nanowires are beneficial to the reflection of light, and the light absorption effect is improved. The invention has low preparation cost and simple preparation process.
Drawings
FIG. 1 is a Scanning Electron Microscope (SEM) image of a titanium dioxide photocatalyst having flower-like nanostructures obtained in example 1;
fig. 2 is a graph of the photocatalytic oxidation efficiency of elemental mercury of the titanium dioxide photocatalyst with the flower-like nano structure obtained in example 1 and industrial-grade titanium dioxide (P25).
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
The specifications of the reagents used in the present invention are shown in table 1.
TABLE 1
Example 1
The embodiment provides a preparation method of a titanium dioxide photocatalyst with a flower-like nano structure, which comprises the following specific steps:
(1) dissolving 0.1g of titanium powder in 139mL of 30% hydrogen peroxide solution, adding 1.1mL of 5mol/L dilute nitric acid and 9.9mL of deionized water, continuously magnetically stirring for 2h under the condition of 80 ℃ water bath, and naturally cooling to room temperature to obtain a mixed solution A; wherein the mesh number of the titanium powder is 200-300 meshes;
(2) measuring 18mL of mixed solution A, putting the mixed solution A into a hydrothermal reaction kettle, adding 5mL of 100mol/L sodium hydroxide solution, sealing the hydrothermal reaction kettle, and carrying out hydrothermal reaction for 5 hours in a homogeneous reactor at the temperature of 150 ℃; naturally cooling to room temperature, collecting products, and washing with deionized water and 0.1mol/L nitric acid solution for 3 times respectively to obtain a mixture B;
(3) drying the mixture B prepared in the step (2) in an oven at the temperature of 80 ℃ for 12 hours to obtain a solid sample; and calcining the solid sample in a muffle furnace at 500 ℃ for 2h to obtain the titanium dioxide photocatalyst with the flower-like nano structure.
Fig. 1 is a Scanning Electron Microscope (SEM) image of the titanium dioxide photocatalyst having a flower-like nanostructure obtained in example 1, which shows that flower-like nanowires abundant on the surface of the sample are visible, which is beneficial to reflection of incident light, and improves the light absorption effect, thereby improving the photocatalytic efficiency.
Example 2
The embodiment provides an application of the titanium dioxide photocatalyst with the flower-like nano structure in photocatalytic oxidation of elemental mercury, and the specific steps are as follows:
(1) 50mg of the flower-like titanium dioxide photocatalyst obtained in example 1 was weighed and dissolved in a beaker containing 10mL of absolute ethanol;
(2) after the beaker in the step (1) is subjected to ultrasonic oscillation operation, uniformly coating the mixture on a quartz glass slide;
(3) placing the quartz slide in the step (2) in an oven at 80 ℃, and drying for 10min to obtain a quartz slide to be reacted;
(4) placing the quartz slide to be reacted in the step (3) in a heterogeneous photocatalytic reactor, performing a simple substance mercury photocatalytic oxidation experiment and recording experimental data;
(5) 50mg of technical-grade titanium dioxide (P25) was weighed out and the procedure was repeated.
Fig. 2 is a graph of the photocatalytic oxidation efficiency of elemental mercury of the titanium dioxide photocatalyst with the flower-like nanostructure obtained in example 1 and industrial-grade titanium dioxide (P25), and it can be known that the elemental mercury oxidation efficiency of the titanium dioxide photocatalyst with the flower-like nanostructure prepared in the present invention can be improved by 31.8% compared with that of industrial-grade titanium dioxide (P25).
Claims (5)
1. A preparation method of a titanium dioxide photocatalyst with a flower-like nano structure is characterized by comprising the following steps:
(1) dissolving titanium powder in 30% hydrogen peroxide solution, adding nitric acid and deionized water, continuously magnetically stirring for 2 hours under the condition of 80 ℃ water bath, and naturally cooling to room temperature to obtain mixed solution A;
(2) putting the mixed solution A into a hydrothermal reaction kettle, adding a sodium hydroxide solution, sealing the hydrothermal reaction kettle, and carrying out hydrothermal reaction for 5 hours in a homogeneous reactor at the temperature of 150 ℃; naturally cooling to room temperature, collecting products, and washing with deionized water and 0.1mol/L nitric acid solution for 3 times respectively to obtain a mixture B;
(3) drying the mixture B prepared in the step (2) in an oven at the temperature of 80 ℃ for 12 hours to obtain a solid sample; and calcining the solid sample in a muffle furnace at 500 ℃ for 2h to obtain the titanium dioxide photocatalyst with the flower-like nano structure.
2. The method for preparing the titanium dioxide photocatalyst with the flower-like nano structure according to claim 1, wherein the concentration of the dilute nitric acid in the step (1) is 5mol/L, and the dosage ratio of the titanium powder, the hydrogen peroxide solution, the dilute nitric acid and the deionized water is 0.1g:139mL:1.1mL:9.9 mL.
3. The method for preparing titanium dioxide photocatalyst having flower-like nanostructure according to claim 1, wherein the concentration of the sodium hydroxide solution in the step (2) is 100mol/L, and the volume ratio of the mixed solution a to the sodium hydroxide solution is 3.6: 1.
4. A titanium dioxide photocatalyst having flower-like nanostructures prepared by the method of any one of claims 1 to 3.
5. Use of the titanium dioxide photocatalyst with flower-like nano structure prepared by the method of any one of claims 1 to 3 in photocatalytic oxidation of elemental mercury.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111495352A (en) * | 2020-04-27 | 2020-08-07 | 昆明理工大学 | Method for efficiently carrying out photocatalytic oxidation on elemental mercury through metal doping modification of strontium titanate |
| CN112029332A (en) * | 2020-09-04 | 2020-12-04 | 万华化学集团股份有限公司 | Water-based antibacterial coating and preparation method thereof |
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| CN112029332B (en) * | 2020-09-04 | 2022-03-11 | 万华化学集团股份有限公司 | Water-based antibacterial coating and preparation method thereof |
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