CN110813331A - BiOBr/TiO2 composite photocatalyst and preparation method thereof - Google Patents
BiOBr/TiO2 composite photocatalyst and preparation method thereof Download PDFInfo
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- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 title claims abstract description 122
- 239000011941 photocatalyst Substances 0.000 title claims abstract description 67
- 239000002131 composite material Substances 0.000 title claims abstract description 64
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 24
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 claims abstract description 23
- 239000011259 mixed solution Substances 0.000 claims abstract description 23
- 239000000243 solution Substances 0.000 claims abstract description 19
- APQHKWPGGHMYKJ-UHFFFAOYSA-N Tributyltin oxide Chemical compound CCCC[Sn](CCCC)(CCCC)O[Sn](CCCC)(CCCC)CCCC APQHKWPGGHMYKJ-UHFFFAOYSA-N 0.000 claims abstract description 18
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052797 bismuth Inorganic materials 0.000 claims abstract description 15
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000005303 weighing Methods 0.000 claims abstract description 15
- 238000003756 stirring Methods 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 239000008367 deionised water Substances 0.000 claims abstract description 8
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 8
- 238000001035 drying Methods 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 238000005406 washing Methods 0.000 claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims description 17
- 239000000126 substance Substances 0.000 claims description 15
- 239000010936 titanium Substances 0.000 claims description 15
- FPCJKVGGYOAWIZ-UHFFFAOYSA-N butan-1-ol;titanium Chemical compound [Ti].CCCCO.CCCCO.CCCCO.CCCCO FPCJKVGGYOAWIZ-UHFFFAOYSA-N 0.000 claims description 7
- 238000000967 suction filtration Methods 0.000 claims description 7
- 230000001699 photocatalysis Effects 0.000 abstract description 14
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 238000005215 recombination Methods 0.000 abstract description 4
- 230000006798 recombination Effects 0.000 abstract description 4
- 238000004887 air purification Methods 0.000 abstract description 3
- 239000010865 sewage Substances 0.000 abstract description 3
- 239000003054 catalyst Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
- PYWVYCXTNDRMGF-UHFFFAOYSA-N rhodamine B Chemical compound [Cl-].C=12C=CC(=[N+](CC)CC)C=C2OC2=CC(N(CC)CC)=CC=C2C=1C1=CC=CC=C1C(O)=O PYWVYCXTNDRMGF-UHFFFAOYSA-N 0.000 description 23
- 229940043267 rhodamine b Drugs 0.000 description 18
- 239000000047 product Substances 0.000 description 14
- 238000005286 illumination Methods 0.000 description 12
- 230000015556 catabolic process Effects 0.000 description 8
- 238000006731 degradation reaction Methods 0.000 description 8
- 229910052719 titanium Inorganic materials 0.000 description 7
- 238000002835 absorbance Methods 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 5
- 239000000706 filtrate Substances 0.000 description 5
- 238000007689 inspection Methods 0.000 description 5
- 239000012528 membrane Substances 0.000 description 5
- 238000002336 sorption--desorption measurement Methods 0.000 description 5
- 238000000870 ultraviolet spectroscopy Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 3
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 2
- 239000000975 dye Substances 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 1
- 239000002280 amphoteric surfactant Substances 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001804 emulsifying effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000013032 photocatalytic reaction Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000000634 powder X-ray diffraction Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 238000003911 water pollution Methods 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
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/06—Halogens; Compounds thereof
- B01J27/135—Halogens; Compounds thereof with titanium, zirconium, hafnium, germanium, tin or lead
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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
- B01J35/39—Photocatalytic properties
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
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- C02F2101/38—Organic compounds containing nitrogen
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Abstract
The invention discloses a BiOBr/TiO2 composite photocatalyst and a preparation method thereof, wherein the molar ratio of bismuth element to titanium element in the BiOBr/TiO2 composite photocatalyst is 1:5 or 1:1 or 1:2.5 or 1:7.5 or 1:10 or 5:1 or 10: 1. The preparation method of the composite photocatalyst comprises weighing appropriate amount of Bi (NO)3)3.5H2Dissolving O and CTAB in absolute ethyl alcohol respectively, and then mixing the two solutions uniformly; weighing a proper amount of TBOT, dissolving the TBOT in absolute ethyl alcohol, and adding the TBOT into the prepared mixed solution; and magnetically stirring the mixed solution, reacting at constant temperature, cooling, alternately washing with deionized water and absolute ethyl alcohol for several times, and drying the product to obtain the catalyst. The BiOBr/TiO2 composite photocatalyst is simple to synthesize and low in cost, and can remarkably reduce the recombination of photo-generated electrons and holes and improve the photocatalytic performance. Can be widely usedThe method is widely applied to the environmental protection fields of photocatalytic sewage treatment, air purification and the like.
Description
Technical Field
The invention relates to the technical field of photocatalysts, in particular to a BiOBr/TiO2 composite photocatalyst and a preparation method thereof.
Background
The environmental pollution includes water pollution, light pollution, air pollution, heavy metal pollution and the like. Covers the fields of civil use, industry, commerce, military and the like, and the improvement and treatment of environmental pollution become more and more important. The photocatalytic material has potential application in the aspect of pollutant treatment, and the photocatalytic reaction carried out by utilizing solar energy is generally concerned about environmental improvement and energy development.
TiO2The photocatalyst has the advantages of good stability, low cost, no toxicity, no secondary pollution, easy doping modification and the like, so that the photocatalyst is considered as an ideal photocatalytic material, and is widely researched. But TiO22There are two drawbacks: (1) the forbidden band range is wider and is 3.2eV, and the utilization rate of light is low; (2) the recombination rate of photo-generated electrons and holes is high, and the photon efficiency is poor. These two drawbacks limit TiO2Practical application of (2), therefore, TiO is required2Modification studies were conducted to improve their photocatalytic properties.
Disclosure of Invention
The invention aims to provide a BiOBr/TiO2 composite photocatalyst and a preparation method thereof, wherein the BiOBr and TiO2 composite photocatalyst is prepared by using BiOBr and TiO2The photocatalyst is compounded to prepare the photocatalyst with high activity and universality under visible light.
In order to achieve the purpose, the technical scheme adopted by the invention comprises the following contents:
the molar ratio of the contents of bismuth and titanium in the BiOBr/TiO2 composite photocatalyst is 1:5 or 1:1 or 1:2.5 or 1:7.5 or 1:10 or 5:1 or 10: 1.
Preferably, the molar ratio of the bismuth element to the titanium element in the BiOBr/TiO2 composite photocatalyst is 1: 1.
A preparation method of a BiOBr/TiO2 composite photocatalyst comprises the following steps:
step one, weighing 0.6-6.0gBi (NO)3)3.5H2Dissolving O and 1.2g CTAB in 20ml of absolute ethyl alcohol respectively, and then uniformly mixing the two solutions;
step two, weighing 0.42-4.2g of TBOT, dissolving in 30ml of absolute ethyl alcohol, and adding into the mixed solution prepared in the step one;
step three, magnetically stirring the mixed solution prepared in the step two for 0.5h, then transferring the mixed solution into a high-temperature reaction kettle, and reacting for 10h at the constant temperature of 150 ℃; naturally cooling to room temperature, carrying out suction filtration, alternately washing with deionized water and absolute ethyl alcohol for a plurality of times, collecting the product, and drying the product in an oven at 80 ℃ for 5 hours to obtain the dried flower-shaped BiOBr/TiO2 composite photocatalyst.
Wherein: in the first step, CTAB is short for hexadecyl trimethyl ammonium bromide, and the chemical molecular formula is as follows: c19H42BrN; TBOT in the second step is short for butyl titanate, and the chemical molecular formula is C16H36O4Ti。
BiOBr as a novel narrow-band-gap semiconductor material (the forbidden band width is 2.5-2.9eV) has unique electronsStructure, good optical property and catalytic property. By utilizing the advantages of better activity and stability on various dyes and the like, the dye can react with TiO2The photocatalyst is compounded, and the photocatalyst with high activity and universality under visible light can be prepared.
CTAB is white or light yellow crystal to powder, has pungent smell, is easily dissolved in isopropanol, is soluble in water, generates a large amount of foam during oscillation, and can have good coordination with anionic, nonionic and amphoteric surfactants. Has excellent penetrating, softening, emulsifying, antistatic, biological degrading and sterilizing performance.
TBOT is colorless to light yellow liquid, is inflammable and low in toxicity, is a glassy solid at the temperature of below-55 ℃, is dissolved in most organic solutions except ketones, and has the relative density of 0.966, the boiling point of 310-314 ℃, the flash point of 76.7 ℃ and the refractive index of 1.486. The product can rapidly absorb moisture and decompose in air, has very high chemical activity on water, and can be hydrolyzed to generate Ti (OH)4And therefore, must be stored in an anhydrous environment. Is soluble in most organic solvents. Due to its moisture absorbing properties, the used straws and the like are cleaned in time.
The BiOBr/TiO2 composite photocatalyst prepared by the invention is simple to synthesize, low in cost, high in specific surface area and excellent in mesoporous structure, and can remarkably reduce the recombination of photo-generated electrons and holes and improve the photocatalytic performance. Can be widely applied to the environmental protection fields of photocatalytic sewage treatment, air purification and the like.
As shown in figure 1, under the irradiation of visible light for 20min, BiOBr/TiO prepared by the invention2The degradation rate of the composite photocatalyst to rhodamine B is as high as 98.98%. And BiOBr and TiO singly2The degradation rate of rhodamine B under the same conditions is 85.93% and 47.43% respectively.
Drawings
FIG. 1 is an electron microscope scan of a BiOBr/TiO2 composite photocatalyst according to the invention;
FIG. 2 shows the BiOBr/TiO2 composite photocatalyst and single BiOBr and TiO2XRD (X-ray powder diffraction) pattern of (a);
FIG. 3 is a graph of the present invention preparedThe BiOBr/TiO2 composite photocatalyst and the single BiOBr and TiO2A degradation rate contrast graph of rhodamine B under the same conditions;
FIG. 4 is a structural diagram of rhodamine B.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples.
Example 1
A BiOBr/TiO2 composite photocatalyst, wherein the molar ratio of bismuth element to titanium element is 1: 1.
The preparation method of the BiOBr/TiO2 composite photocatalyst comprises the following steps:
step one, weighing 0.6gBi (NO)3)3.5H2Dissolving O and 1.2g CTAB in 20ml of absolute ethyl alcohol respectively, and then uniformly mixing the two solutions;
step two, weighing 0.42g of TBOT, dissolving in 30ml of absolute ethyl alcohol, and adding into the mixed solution prepared in the step one;
step three, magnetically stirring the mixed solution prepared in the step two for 0.5h, then transferring the mixed solution into a high-temperature reaction kettle, and reacting for 10h at the constant temperature of 150 ℃; naturally cooling to room temperature, carrying out suction filtration, alternately washing with deionized water and absolute ethyl alcohol for a plurality of times, collecting the product, and drying the product in an oven at 80 ℃ for 5 hours to obtain the dried BiOBr/TiO2 composite photocatalyst.
Through inspection, the molar ratio of the contents of bismuth and titanium in the prepared BiOBr/TiO2 composite photocatalyst is 1: 1.
Wherein: in the first step, CTAB is short for hexadecyl trimethyl ammonium bromide, and the chemical molecular formula is as follows: c19H42BrN; TBOT in the second step is short for butyl titanate, and the chemical molecular formula is C16H36O4Ti。
And (3) observing the photocatalytic activity of the prepared BiOBr/TiO2 composite photocatalyst by taking degraded rhodamine B as a model reaction: 0.05g of the BiOBr/TiO2 composite photocatalyst sample prepared in this example was weighed out and dispersed in 50mL of a 3X 10 composite photocatalyst-5In mol/L rhodamine B water solution; before illumination, sampleMagnetically stirring the product in a dark condition for 30min to achieve adsorption-desorption balance, and taking an initial sample; after illumination begins, 3mL of reaction solution samples are taken every 5min, the BiOBr/TiO2 composite photocatalyst is removed by using a filter membrane, the absorbance of the filtrate is measured at the characteristic absorption wavelength (553nm) of RhB by using an ultraviolet visible spectrophotometer, and the concentration of rhodamine B can be determined by using a rhodamine standard curve. The light irradiation is carried out for 20min, and the degradation rate is 98.98 percent.
Example 2
A BiOBr/TiO2 composite photocatalyst, wherein the molar ratio of bismuth element to titanium element is 1: 5.
The preparation method of the BiOBr/TiO2 composite photocatalyst comprises the following steps:
step one, weighing 0.6gBi (NO)3)3.5H2Dissolving O and 1.2g CTAB in 20ml of absolute ethyl alcohol respectively, and then uniformly mixing the two solutions;
step two, weighing 2.1g of TBOT, dissolving in 30ml of absolute ethyl alcohol, and adding into the mixed solution prepared in the step one;
step three, magnetically stirring the mixed solution prepared in the step two for 0.5h, then transferring the mixed solution into a high-temperature reaction kettle, and reacting for 10h at the constant temperature of 150 ℃; naturally cooling to room temperature, carrying out suction filtration, alternately washing with deionized water and absolute ethyl alcohol for a plurality of times, collecting the product, and drying the product in an oven at 80 ℃ for 5 hours to obtain the dried BiOBr/TiO2 composite photocatalyst.
Through inspection, the molar ratio of the contents of bismuth and titanium in the prepared BiOBr/TiO2 composite photocatalyst is 1: 5.
Wherein: in the first step, CTAB is short for hexadecyl trimethyl ammonium bromide, and the chemical molecular formula is as follows: c19H42BrN; TBOT in the second step is short for butyl titanate, and the chemical molecular formula is C16H36O4Ti。
And (3) observing the photocatalytic activity of the prepared BiOBr/TiO2 composite photocatalyst by taking degraded rhodamine B as a model reaction: 0.05g of the BiOBr/TiO2 composite photocatalyst sample prepared in this example was weighed out and dispersed in 50mL of a 3X 10 composite photocatalyst-5In mol/L rhodamine B water solution(ii) a Before illumination, the sample is firstly magnetically stirred for 30min under the condition of keeping out of the sun to achieve adsorption-desorption balance, and an initial sample is taken; after illumination begins, 3mL of reaction solution samples are taken every 5min, the BiOBr/TiO2 composite photocatalyst is removed by using a filter membrane, the absorbance of the filtrate is measured at the characteristic absorption wavelength (553nm) of RhB by using an ultraviolet visible spectrophotometer, and the concentration of rhodamine B can be determined by using a rhodamine standard curve. The degradation rate is 97.72% after 20min of illumination.
Example 3
A BiOBr/TiO2 composite photocatalyst, wherein the molar ratio of the contents of bismuth and titanium is 1: 10.
The preparation method of the BiOBr/TiO2 composite photocatalyst comprises the following steps:
step one, weighing 0.6gBi (NO)3)3.5H2Dissolving O and 1.2g CTAB in 20ml of absolute ethyl alcohol respectively, and then uniformly mixing the two solutions;
step two, weighing 4.2g of TBOT, dissolving in 30ml of absolute ethyl alcohol, and adding into the mixed solution prepared in the step one;
step three, magnetically stirring the mixed solution prepared in the step two for 0.5h, then transferring the mixed solution into a high-temperature reaction kettle, and reacting for 10h at the constant temperature of 150 ℃; naturally cooling to room temperature, carrying out suction filtration, alternately washing with deionized water and absolute ethyl alcohol for a plurality of times, collecting the product, and drying the product in an oven at 80 ℃ for 5 hours to obtain the dried BiOBr/TiO2 composite photocatalyst.
Through inspection, the molar ratio of the contents of bismuth and titanium in the prepared BiOBr/TiO2 composite photocatalyst is 1: 10.
Wherein: in the first step, CTAB is short for hexadecyl trimethyl ammonium bromide, and the chemical molecular formula is as follows: c19H42BrN; TBOT in the second step is short for butyl titanate, and the chemical molecular formula is C16H36O4Ti。
And (3) observing the photocatalytic activity of the prepared BiOBr/TiO2 composite photocatalyst by taking degraded rhodamine B as a model reaction: 0.05g of the BiOBr/TiO2 composite photocatalyst sample prepared in this example was weighed out and dispersed in 50mL of a 3X 10 composite photocatalyst-5mol/L ofRhodamine B water solution; before illumination, the sample is firstly magnetically stirred for 30min under the condition of keeping out of the sun to achieve adsorption-desorption balance, and an initial sample is taken; after illumination begins, 3mL of reaction solution samples are taken every 5min, the BiOBr/TiO2 composite photocatalyst is removed by using a filter membrane, the absorbance of the filtrate is measured at the characteristic absorption wavelength (553nm) of RhB by using an ultraviolet visible spectrophotometer, and the concentration of rhodamine B can be determined by using a rhodamine standard curve. The light irradiation is carried out for 20min, and the degradation rate is 98.53 percent.
Example 4
A BiOBr/TiO2 composite photocatalyst, wherein the molar ratio of bismuth element to titanium element is 5: 1.
The preparation method of the BiOBr/TiO2 composite photocatalyst comprises the following steps:
step one, 3.0gBi (NO) is weighed3)3.5H2Dissolving O and 1.2g CTAB in 20ml of absolute ethyl alcohol respectively, and then uniformly mixing the two solutions;
step two, weighing 0.42g of TBOT, dissolving in 30ml of absolute ethyl alcohol, and adding into the mixed solution prepared in the step one;
step three, magnetically stirring the mixed solution prepared in the step two for 0.5h, then transferring the mixed solution into a high-temperature reaction kettle, and reacting for 10h at the constant temperature of 150 ℃; naturally cooling to room temperature, carrying out suction filtration, alternately washing with deionized water and absolute ethyl alcohol for a plurality of times, collecting the product, and drying the product in an oven at 80 ℃ for 5 hours to obtain the dried BiOBr/TiO2 composite photocatalyst.
Through inspection, the molar ratio of the contents of bismuth and titanium in the prepared BiOBr/TiO2 composite photocatalyst is 5: 1.
Wherein: in the first step, CTAB is short for hexadecyl trimethyl ammonium bromide, and the chemical molecular formula is as follows: c19H42BrN; TBOT in the second step is short for butyl titanate, and the chemical molecular formula is C16H36O4Ti。
And (3) observing the photocatalytic activity of the prepared BiOBr/TiO2 composite photocatalyst by taking degraded rhodamine B as a model reaction: 0.05g of the BiOBr/TiO2 composite photocatalyst sample prepared in this example was weighed out and dispersed in 50mL of a 3X 10 composite photocatalyst-5In mol/L rhodamine B water solution; before illumination, the sample is firstly magnetically stirred for 30min under the condition of keeping out of the sun to achieve adsorption-desorption balance, and an initial sample is taken; after illumination begins, 3mL of reaction solution samples are taken every 5min, the BiOBr/TiO2 composite photocatalyst is removed by using a filter membrane, the absorbance of the filtrate is measured at the characteristic absorption wavelength (553nm) of RhB by using an ultraviolet visible spectrophotometer, and the concentration of rhodamine B can be determined by using a rhodamine standard curve. The degradation rate is 66.30% after 20min of illumination.
Example 5
A BiOBr/TiO2 composite photocatalyst, wherein the molar ratio of bismuth element to titanium element is 1: 1.
The preparation method of the BiOBr/TiO2 composite photocatalyst comprises the following steps:
step one, weighing 6.0gBi (NO)3)3.5H2Dissolving O and 1.2g CTAB in 20ml of absolute ethyl alcohol respectively, and then uniformly mixing the two solutions;
step two, weighing 0.42g of TBOT, dissolving in 30ml of absolute ethyl alcohol, and adding into the mixed solution prepared in the step one;
step three, magnetically stirring the mixed solution prepared in the step two for 0.5h, then transferring the mixed solution into a high-temperature reaction kettle, and reacting for 10h at the constant temperature of 150 ℃; naturally cooling to room temperature, carrying out suction filtration, alternately washing with deionized water and absolute ethyl alcohol for a plurality of times, collecting the product, and drying the product in an oven at 80 ℃ for 5 hours to obtain the dried BiOBr/TiO2 composite photocatalyst.
Through inspection, the molar ratio of the contents of bismuth and titanium in the prepared BiOBr/TiO2 composite photocatalyst is 10: 1.
Wherein: in the first step, CTAB is short for hexadecyl trimethyl ammonium bromide, and the chemical molecular formula is as follows: c19H42BrN; TBOT in the second step is short for butyl titanate, and the chemical molecular formula is C16H36O4Ti。
And (3) observing the photocatalytic activity of the prepared BiOBr/TiO2 composite photocatalyst by taking degraded rhodamine B as a model reaction: 0.05g of the BiOBr/TiO2 composite photocatalyst sample prepared in the example was weighed out and dispersedAt a concentration of 3X 10 in 50mL-5In mol/L rhodamine B water solution; before illumination, the sample is firstly magnetically stirred for 30min under the condition of keeping out of the sun to achieve adsorption-desorption balance, and an initial sample is taken; after illumination begins, 3mL of reaction solution samples are taken every 5min, the BiOBr/TiO2 composite photocatalyst is removed by using a filter membrane, the absorbance of the filtrate is measured at the characteristic absorption wavelength (553nm) of RhB by using an ultraviolet visible spectrophotometer, and the concentration of rhodamine B can be determined by using a rhodamine standard curve. The light irradiation is carried out for 20min, and the degradation rate is 59.86%.
The BiOBr/TiO2 composite photocatalyst prepared by the invention is simple to synthesize, low in cost, high in specific surface area and excellent in mesoporous structure, and can remarkably reduce the recombination of photo-generated electrons and holes and improve the photocatalytic performance. Can be widely applied to the environmental protection fields of photocatalytic sewage treatment, air purification and the like.
Claims (3)
1. A BiOBr/TiO2 composite photocatalyst is characterized in that: the molar ratio of the bismuth element to the titanium element in the BiOBr/TiO2 composite photocatalyst is 1:5 or 1:1 or 1:2.5 or 1:7.5 or 1:10 or 5:1 or 10: 1.
2. The BiOBr/TiO2 composite photocatalyst as claimed in claim 1, wherein: the molar ratio of the bismuth element to the titanium element in the BiOBr/TiO2 composite photocatalyst is 1: 1.
3. A preparation method of a BiOBr/TiO2 composite photocatalyst is characterized by comprising the following steps: it comprises the following steps:
step one, weighing 0.6-6.0gBi (NO)3)3.5H2Dissolving O and 1.2g CTAB in 20ml of absolute ethyl alcohol respectively, and then uniformly mixing the two solutions;
step two, weighing 0.42-4.2g of TBOT, dissolving in 30ml of absolute ethyl alcohol, and adding into the mixed solution prepared in the step one;
step three, magnetically stirring the mixed solution prepared in the step two for 0.5-1h, then transferring the mixed solution into a high-temperature reaction kettle, and reacting for 10h at the constant temperature of 150 ℃; naturally cooling to room temperature, carrying out suction filtration, alternately washing with deionized water and absolute ethyl alcohol for a plurality of times, collecting the product, and drying the product in an oven at 80 ℃ for 5 hours to obtain the dried BiOBr/TiO2 composite photocatalyst.
Wherein: in the first step, CTAB is short for hexadecyl trimethyl ammonium bromide, and the chemical molecular formula is as follows: c19H42BrN; TBOT in the second step is short for butyl titanate, and the chemical molecular formula is C16H36O4Ti。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910766002.4A CN110813331A (en) | 2019-08-19 | 2019-08-19 | BiOBr/TiO2 composite photocatalyst and preparation method thereof |
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| CN112007633A (en) * | 2020-09-15 | 2020-12-01 | 西北矿冶研究院 | La/Bi2WO6Preparation method and application of photocatalyst |
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| CN113289646A (en) * | 2021-05-05 | 2021-08-24 | 桂林理工大学 | Core-shell structured nanoflower/nanoparticle bismuth oxybromide/titanium dioxide visible-light-driven photocatalyst and preparation method and application thereof |
| CN114733504A (en) * | 2022-05-10 | 2022-07-12 | 杭州职业技术学院 | Preparation method and application of self-cleaning gel with adsorption-photocatalysis synergistic effect |
| CN115430441A (en) * | 2022-09-29 | 2022-12-06 | 西安交通大学 | Copper-doped bismuth oxybromide-titanium dioxide composite photocatalyst and preparation method and application thereof |
| CN116832837A (en) * | 2023-03-21 | 2023-10-03 | 武汉理工大学 | Flower ball-shaped TiO 2 Heterojunction material with/BiOBr core-shell structure and preparation method and application thereof |
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| CN114733504B (en) * | 2022-05-10 | 2023-12-19 | 杭州职业技术学院 | Preparation method and application of self-cleaning gel with synergistic effect of adsorption and photocatalysis |
| CN115430441A (en) * | 2022-09-29 | 2022-12-06 | 西安交通大学 | Copper-doped bismuth oxybromide-titanium dioxide composite photocatalyst and preparation method and application thereof |
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| CN116832837A (en) * | 2023-03-21 | 2023-10-03 | 武汉理工大学 | Flower ball-shaped TiO 2 Heterojunction material with/BiOBr core-shell structure and preparation method and application thereof |
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