CN108325519B - Preparation method and application of cotton fibrous titanium dioxide loaded with platinum nanoparticles - Google Patents
Preparation method and application of cotton fibrous titanium dioxide loaded with platinum nanoparticles Download PDFInfo
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- CN108325519B CN108325519B CN201810050067.4A CN201810050067A CN108325519B CN 108325519 B CN108325519 B CN 108325519B CN 201810050067 A CN201810050067 A CN 201810050067A CN 108325519 B CN108325519 B CN 108325519B
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- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 title claims abstract description 100
- 229920000742 Cotton Polymers 0.000 title claims abstract description 68
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 title claims abstract description 58
- 239000002105 nanoparticle Substances 0.000 title claims abstract description 26
- 229910052697 platinum Inorganic materials 0.000 title claims abstract description 23
- 239000004408 titanium dioxide Substances 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000011941 photocatalyst Substances 0.000 claims abstract description 21
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 15
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000001257 hydrogen Substances 0.000 claims abstract description 12
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 230000001699 photocatalysis Effects 0.000 claims abstract description 9
- 238000000926 separation method Methods 0.000 claims abstract description 9
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 60
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 31
- 239000011259 mixed solution Substances 0.000 claims description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 238000004140 cleaning Methods 0.000 claims description 16
- 239000008367 deionised water Substances 0.000 claims description 15
- 229910021641 deionized water Inorganic materials 0.000 claims description 15
- 239000000843 powder Substances 0.000 claims description 15
- 238000011068 loading method Methods 0.000 claims description 13
- 239000007787 solid Substances 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 11
- 229910001868 water Inorganic materials 0.000 claims description 10
- YHWCPXVTRSHPNY-UHFFFAOYSA-N butan-1-olate;titanium(4+) Chemical compound [Ti+4].CCCC[O-].CCCC[O-].CCCC[O-].CCCC[O-] YHWCPXVTRSHPNY-UHFFFAOYSA-N 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 235000019441 ethanol Nutrition 0.000 claims description 8
- 238000009210 therapy by ultrasound Methods 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 239000000243 solution Substances 0.000 claims description 6
- 230000002745 absorbent Effects 0.000 claims description 4
- 239000002250 absorbent Substances 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 238000001354 calcination Methods 0.000 claims description 4
- 230000001678 irradiating effect Effects 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 239000000725 suspension Substances 0.000 claims description 4
- 229910052724 xenon Inorganic materials 0.000 claims description 4
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 claims description 4
- 229910002621 H2PtCl6 Inorganic materials 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 6
- 239000002131 composite material Substances 0.000 abstract description 6
- 238000000151 deposition Methods 0.000 abstract description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000006862 quantum yield reaction Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000004627 transmission electron microscopy Methods 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002173 high-resolution transmission electron microscopy Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000007146 photocatalysis Methods 0.000 description 1
- 238000013032 photocatalytic reaction Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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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
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
- B01J23/42—Platinum
-
- 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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- 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
- B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
- B01J35/58—Fabrics or filaments
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
- C01B3/02—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
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Abstract
A preparation method and application of cotton fibrous titanium dioxide loaded with platinum nanoparticles. The invention relates to a preparation method and application of a composite photocatalyst. The invention aims to solve the problem of TiO prepared by the existing method2The Pt composite photocatalyst has the problems of small Schottky junction interface area, single electron transmission path, low charge transmission speed and low charge separation efficiency. The method comprises the following steps: preparing TiO with two-dimensional fold by using cotton fiber as a template2And depositing Pt nanoparticles on the surface thereof. The cotton fibrous titanium dioxide loaded with the platinum nanoparticles is used for photocatalytic hydrogen production.
Description
Technical Field
The invention relates to a preparation method and application of a composite photocatalyst.
Background
Energy and environmental problems are the permanent topics on the green sustainable development road and also the most challenging research subjects in the world today. At present, the direct conversion of solar energy into chemical energy has been regarded as a key point for solving the above problems. Hydrogen energy is one of the most promising green clean energy sources that can replace traditional energy sources (petroleum, coal, etc.). Therefore, the photocatalytic reaction capable of generating hydrogen energy is receiving increasing attention. Titanium dioxide (TiO)2) Has received great attention and acceptance over the past several decades as one of the most practical photocatalysts. Of course, TiO2Has considerable development prospect in the field of photocatalysis. However, most of the photogenerated electrons or holes recombine in the path of migration to the surface, and only a small fraction of the electrons and holes participate in the reaction, which greatly reduces the TiO2Photocatalytic hydrogen production efficiency. Therefore, how to improve the separation efficiency of the photogenerated electron-hole pairs is an important issue in the field of new energy materials for some time in the future.
It is well known in TiO2Surface deposition of noble metalThe rice grains can form Schottky (Schottky) junctions, and the separation efficiency of photo-generated electron-hole pairs can be greatly improved. Platinum (Pt), because of its smaller work function and lower overpotential, is one of the most widely studied noble metals. At present, TiO is used2The Pt composite photocatalyst is frequently reported, and the achievement is obvious. However, charge transfer efficiency remains a bottleneck. The structure of the interface determines to a large extent the transfer efficiency and thus has a significant influence on the catalytic reactions taking place at the surface of the active building blocks. Therefore, reasonable construction and adjustment of the interface relationship between the composite photocatalysts are important directions for future catalyst development.
Disclosure of Invention
The invention aims to solve the problem of TiO prepared by the existing method2The Pt/composite photocatalyst has the problems of small Schottky junction interface area, single electron transmission path, low charge transmission speed and low charge separation efficiency, and provides a preparation method and application of cotton fibrous titanium dioxide loaded with platinum nanoparticles.
The preparation method of the cotton fibrous titanium dioxide loaded with the platinum nanoparticles comprises the following steps:
firstly, placing absorbent cotton in absolute ethyl alcohol, stirring for 5-15 min, and then dripping 25-28% of NH into the absorbent cotton3·H2O, performing ultrasonic treatment for 10-20 min, and then adding tetrabutyl titanate under the condition of stirring to obtain a mixed solution; placing the mixed solution in a water bath at 35-50 ℃ and stirring for 8-16 h, taking the absorbent cotton out of the mixed solution, firstly cleaning the absorbent cotton for 3-5 times by using ethanol, then cleaning the absorbent cotton for 3-5 times by using deionized water, then drying the absorbent cotton for 8-16 h at the temperature of 40-60 ℃ to obtain dry cotton, and placing the dry cotton in a muffle furnace and calcining the dry cotton for 3-6 h at the temperature of 450-550 ℃ to obtain white powder; the volume ratio of the mass of the absorbent cotton to the absolute ethyl alcohol is 1g (300-350) mL; the mass and mass fraction of the absorbent cotton are 25-28% of NH3·H2The volume ratio of O is 1g (1-1.5) mL; the volume ratio of the mass of the absorbent cotton to the tetrabutyl titanate is 1g (0.1-0.5) mL;
secondly, ultrasonically dispersing the white powder obtained in the first step into a methanol mixed solution, and then adding H into the methanol mixed solution2PtCl6Mixing the solutions, placing the mixed solution under a 300w xenon lamp light source for irradiating for 20-40 min to obtain a gray suspension, performing centrifugal separation, cleaning the solid for 3-5 times by using ethanol, then cleaning for 3-5 times by using deionized water to obtain a gray solid, and drying for 8-16 h at the temperature of 40-60 ℃ to obtain gray solid powder which is TiO2A Pt photocatalyst; the methanol mixed solution is obtained by mixing deionized water and methanol according to the volume ratio of 4: 1; said H2PtCl6The molar concentration of the solution is 19.3 mmol/L; the volume ratio of the mass of the white powder obtained in the first step to the methanol mixed solution is 1g (400-600) mL; the TiO is2The load amount of Pt in the Pt photocatalyst is 0.3 wt% -1.1 wt%.
The cotton fibrous titanium dioxide loaded with the platinum nanoparticles prepared by the method is used for photocatalytic hydrogen production, and the method comprises the following specific steps: adding TiO into the mixture2Dispersing Pt photocatalyst in deionized water, adding methanol, performing ultrasonic treatment for 5-15 min, introducing nitrogen into the reaction system to remove oxygen, and then placing the reaction system under sunlight for irradiation.
The invention has the beneficial effects that:
the invention takes cotton fiber as a template to prepare TiO with two-dimensional fold shape2And depositing Pt nanoparticles on the surface thereof. By enlarging the TiO2The contact area with Pt is increased to increase the area of Schottky junction interface, provide more electron transmission paths, accelerate the charge transmission speed and improve the charge separation efficiency. When the Pt loading amount is 0.9 wt%, the photocatalytic hydrogen production amount reaches the maximum, and is 4698 mu molh-1g-1The apparent quantum yield reaches 40.56%.
Drawings
FIG. 1 shows TiO obtained in the first step of the example2Transmission electron microscopy images of;
FIG. 2 shows CFT-Pt obtained in example one0.9High resolution transmission electron microscopy images;
FIG. 3 is a graph of photocatalytic hydrogen production for samples of different Pt loadings, where1 is CFT, 2 is CFT-Pt0.3And 3 is CFT-Pt0.5And 4 is CFT-Pt0.7And 5 is CFT-Pt0.9And 6 is CFT-Pt1.1。
Detailed Description
The first embodiment is as follows: the preparation method of the platinum nanoparticle-loaded cotton fibrous titanium dioxide of the embodiment specifically comprises the following steps:
firstly, placing absorbent cotton in absolute ethyl alcohol, stirring for 5-15 min, and then dripping 25-28% of NH into the absorbent cotton3·H2O, performing ultrasonic treatment for 10-20 min, and then adding tetrabutyl titanate under the condition of stirring to obtain a mixed solution; placing the mixed solution in a water bath at 35-50 ℃ and stirring for 8-16 h, taking the absorbent cotton out of the mixed solution, firstly cleaning the absorbent cotton for 3-5 times by using ethanol, then cleaning the absorbent cotton for 3-5 times by using deionized water, then drying the absorbent cotton for 8-16 h at the temperature of 40-60 ℃ to obtain dry cotton, and placing the dry cotton in a muffle furnace and calcining the dry cotton for 3-6 h at the temperature of 450-550 ℃ to obtain white powder; the volume ratio of the mass of the absorbent cotton to the absolute ethyl alcohol is 1g (300-350) mL; the mass and mass fraction of the absorbent cotton are 25-28% of NH3·H2The volume ratio of O is 1g (1-1.5) mL; the volume ratio of the mass of the absorbent cotton to the tetrabutyl titanate is 1g (0.1-0.5) mL;
secondly, ultrasonically dispersing the white powder obtained in the first step into a methanol mixed solution, and then adding H into the methanol mixed solution2PtCl6Mixing the solutions, placing the mixed solution under a 300w xenon lamp light source for irradiating for 20-40 min to obtain a gray suspension, performing centrifugal separation, cleaning the solid for 3-5 times by using ethanol, then cleaning for 3-5 times by using deionized water to obtain a gray solid, and drying for 8-16 h at the temperature of 40-60 ℃ to obtain gray solid powder which is TiO2A Pt photocatalyst; the methanol mixed solution is obtained by mixing deionized water and methanol according to the volume ratio of 4: 1; said H2PtCl6The molar concentration of the solution is 19.3 mmol/L; the volume ratio of the mass of the white powder obtained in the first step to the methanol mixed solution is 1g (400-600) mL; the TiO is2Negative of Pt in Pt photocatalystThe loading amount is 0.3 wt% -1.1 wt%.
The second embodiment is as follows: the first difference between the present embodiment and the specific embodiment is: in the first step, the mixed solution is placed in a water bath at 45 ℃ and stirred for 12 hours. Other steps and parameters are the same as those in the first embodiment.
The third concrete implementation mode: the present embodiment differs from the first or second embodiment in that: in the first step, the mixture is dried for 12 hours at the temperature of 50 ℃. Other steps and parameters are the same as those in the first or second embodiment.
The fourth concrete implementation mode: the difference between this embodiment mode and one of the first to third embodiment modes is: in the first step, the dry cotton is placed in a muffle furnace to be calcined for 4 hours at the temperature of 500 ℃. Other steps and parameters are the same as those in one of the first to third embodiments.
The fifth concrete implementation mode: the difference between this embodiment and one of the first to fourth embodiments is: in the step one, the mass and the mass fraction of the absorbent cotton are 25-28% of NH3·H2The volume ratio of O was 0.6g to 0.8 mL. Other steps and parameters are the same as those in one of the first to fourth embodiments.
The sixth specific implementation mode: the difference between this embodiment and one of the first to fifth embodiments is: the volume ratio of the mass of the absorbent cotton to the tetrabutyl titanate in the first step is 1g:0.25 mL. Other steps and parameters are the same as those in one of the first to fifth embodiments.
The seventh embodiment: the difference between this embodiment and one of the first to sixth embodiments is: the TiO in the second step2The Pt loading in the Pt photocatalyst was 0.5 wt%. Other steps and parameters are the same as those in one of the first to sixth embodiments.
The specific implementation mode is eight: the present embodiment differs from one of the first to seventh embodiments in that: the TiO in the second step2The Pt loading in the Pt photocatalyst was 0.7 wt%. Other steps and parameters are the same as those in one of the first to seventh embodiments.
The specific implementation method nine: the present embodiment differs from the first to eighth embodiments in that: the TiO in the second step2The Pt loading in the Pt photocatalyst was 0.9 wt%. Other steps and parameters are the same as those in one to eight of the embodiments.
The detailed implementation mode is ten: the cotton fibrous titanium dioxide loaded with platinum nanoparticles is used for photocatalytic hydrogen production, and the specific steps are as follows: adding TiO into the mixture2Dispersing Pt photocatalyst in deionized water, adding methanol, performing ultrasonic treatment for 5-15 min, introducing nitrogen into the reaction system to remove oxygen, and then placing the reaction system under sunlight for irradiation.
The beneficial effects of the present invention are demonstrated by the following examples:
the first embodiment is as follows: the preparation method of the cotton fibrous titanium dioxide loaded with the platinum nanoparticles comprises the following steps:
firstly, 0.6g of absorbent cotton is placed in 200mL of absolute ethyl alcohol to be stirred for 5min, and then 0.8mL of NH with the mass fraction of 25-28 percent is dripped into the absorbent cotton3·H2O, performing ultrasonic treatment for 15min, and then adding 0.15mL of tetrabutyl titanate under the stirring condition to obtain a mixed solution; placing the mixed solution in a water bath at 45 ℃ for stirring for 12h, taking the absorbent cotton out of the mixed solution, firstly cleaning the absorbent cotton by using ethanol for 3-5 times, then cleaning the absorbent cotton by using deionized water for 3-5 times, then drying the absorbent cotton for 12h at the temperature of 50 ℃ to obtain dry cotton, placing the dry cotton in a muffle furnace for calcining for 4h at the temperature of 500 ℃ to obtain white powder which is TiO2Labeled CFT;
secondly, 0.1g of the white powder obtained in the first step is ultrasonically dispersed in 50mL of methanol mixed solution to obtain TiO2A dispersion liquid; taking 5 parts of TiO2Adding a certain amount of H into the dispersion liquid respectively2PtCl6Respectively enabling the loading capacity of Pt to be 0.3 wt%, 0.5 wt%, 0.7 wt%, 0.9 wt% and 1.1 wt%, mixing, placing under a 300w xenon lamp light source for irradiating for 30min to obtain five parts of gray suspension, performing centrifugal separation, cleaning the solid for 3-5 times by using ethanol, then cleaning for 3-5 times by using deionized water to obtain five parts of gray solid, and drying at 50 ℃ for 12h to obtain five parts of gray solid powder, namely TiO2The samples with different Pt loads are respectively marked as CFT-Ptx(x: represents 0.3, 0.5, 0.7, 0.9 or 1.1).
Thirdly, respectively weighing 40mg of the CFT prepared by the method and five parts of CFT-PtxThe mixture is evenly dispersed in 40mL of deionized water, 10mL of methanol is added, and the mixture is subjected to ultrasonic treatment for 10 min. Nitrogen was then bubbled through the system to remove dissolved oxygen. And then placing the system under the simulated solar illumination, sampling every 1h, and detecting the hydrogen production in the system.
FIG. 1 shows TiO obtained in the first step of the example2Transmission electron microscopy images of; the appearance of the pipe is a wrinkled micron pipe. It can be seen from the figure that the flexible sheet structure can provide better anchoring sites for the loading of the Pt nanoparticles.
FIG. 2 shows CFT-Pt obtained in example one0.9Clearly shows two kinds of crystal lattice stripes, d is 0.22nm and d is 0.34nm, corresponding to the (111) crystal plane of Pt and TiO respectively2The (101) crystal plane of (a). Prove that Pt nanoparticles are successfully loaded on TiO2Of (2) is provided.
FIG. 3 is a graph showing the photocatalytic hydrogen production curves of samples with different Pt loadings, where 1 is CFT and 2 is CFT-Pt0.3And 3 is CFT-Pt0.5And 4 is CFT-Pt0.7And 5 is CFT-Pt0.9And 6 is CFT-Pt1.1(ii) a When the Pt loading mass fraction is 0.9 percent, the photocatalytic hydrogen production amount reaches the maximum and is 4698 mu mol h-1g-1The apparent quantum yield reaches 40.56%.
Claims (10)
1. A preparation method of cotton fibrous titanium dioxide loaded with platinum nanoparticles is characterized in that the preparation method of the cotton fibrous titanium dioxide loaded with platinum nanoparticles is specifically carried out according to the following steps:
firstly, placing absorbent cotton in absolute ethyl alcohol, stirring for 5-15 min, and then dripping 25-28% of NH into the absorbent cotton3·H2O, performing ultrasonic treatment for 10-20 min, and then adding tetrabutyl titanate under the condition of stirring to obtain a mixed solution; placing the mixed solution in a water bath at 35-50 ℃ and stirring for 8-16 h, taking the absorbent cotton out of the mixed solution, firstly cleaning the absorbent cotton by using ethanol for 3-5 times, then cleaning the absorbent cotton by using deionized water for 3-5 times,then drying for 8-16 h at the temperature of 40-60 ℃ to obtain dry cotton, and calcining the dry cotton in a muffle furnace at the temperature of 450-550 ℃ for 3-6 h to obtain white powder; the volume ratio of the mass of the absorbent cotton to the absolute ethyl alcohol is 1g (300-350) mL; the mass and mass fraction of the absorbent cotton are 25-28% of NH3·H2The volume ratio of O is 1g (1-1.5) mL; the volume ratio of the mass of the absorbent cotton to the tetrabutyl titanate is 1g (0.1-0.5) mL;
secondly, ultrasonically dispersing the white powder obtained in the first step into a methanol mixed solution, and then adding H into the methanol mixed solution2PtCl6Mixing the solutions, placing the mixed solution under a 300w xenon lamp light source for irradiating for 20-40 min to obtain a gray suspension, performing centrifugal separation, cleaning the solid for 3-5 times by using ethanol, then cleaning for 3-5 times by using deionized water to obtain a gray solid, and drying for 8-16 h at the temperature of 40-60 ℃ to obtain gray solid powder which is TiO2A Pt photocatalyst; the methanol mixed solution is obtained by mixing deionized water and methanol according to the volume ratio of 4: 1; said H2PtCl6The molar concentration of the solution is 19.3 mmol/L; the volume ratio of the mass of the white powder obtained in the first step to the methanol mixed solution is 1g (400-600) mL; the TiO is2The load amount of Pt in the Pt photocatalyst is 0.3 wt% -1.1 wt%.
2. The method for preparing the cotton fibrous titanium dioxide loaded with the platinum nanoparticles as claimed in claim 1, wherein the mixed solution is stirred in a water bath at 45 ℃ for 12 hours in the first step.
3. The method for preparing the cotton fibrous titanium dioxide loaded with the platinum nanoparticles as claimed in claim 1, wherein the drying at the temperature of 50 ℃ is carried out for 12h in the step one.
4. The preparation method of the cotton fibrous titanium dioxide loaded with the platinum nanoparticles, as claimed in claim 1, wherein in the step one, the dry cotton is placed in a muffle furnace to be calcined for 4h at the temperature of 500 ℃.
5. The method for preparing the cotton fibrous titanium dioxide loaded with the platinum nanoparticles as claimed in claim 1, wherein the mass and mass fraction of the absorbent cotton in the step one are 25-28% of NH3·H2The volume ratio of O was 0.6g to 0.8 mL.
6. The method for preparing the cotton fibrous titanium dioxide loaded with the platinum nanoparticles as claimed in claim 1, wherein the volume ratio of the mass of the cotton wool to the tetrabutyl titanate in the step one is 1g:0.25 mL.
7. The method for preparing the cotton fibrous titanium dioxide loaded with platinum nanoparticles according to claim 1, wherein the TiO in the second step2The Pt loading in the Pt photocatalyst was 0.5 wt%.
8. The method for preparing the cotton fibrous titanium dioxide loaded with platinum nanoparticles according to claim 1, wherein the TiO in the second step2The Pt loading in the Pt photocatalyst was 0.7 wt%.
9. The method for preparing the cotton fibrous titanium dioxide loaded with platinum nanoparticles according to claim 1, wherein the TiO in the second step2The Pt loading in the Pt photocatalyst was 0.9 wt%.
10. The application of the cotton fibrous titanium dioxide loaded with platinum nanoparticles prepared by the method as claimed in claim 1, which is characterized in that the cotton fibrous titanium dioxide loaded with platinum nanoparticles is used for photocatalytic hydrogen production, and the specific steps are as follows: adding TiO into the mixture2Dispersing Pt photocatalyst in deionized water, adding methanol, performing ultrasonic treatment for 5-15 min, introducing nitrogen into the reaction system to remove oxygen, and then placing the reaction system under sunlight for irradiation.
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