CN111921518A - Reinforced La2Ti2O7Method for photocatalytic performance - Google Patents
Reinforced La2Ti2O7Method for photocatalytic performance Download PDFInfo
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- CN111921518A CN111921518A CN202010776994.1A CN202010776994A CN111921518A CN 111921518 A CN111921518 A CN 111921518A CN 202010776994 A CN202010776994 A CN 202010776994A CN 111921518 A CN111921518 A CN 111921518A
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- 230000001699 photocatalysis Effects 0.000 title claims abstract description 20
- 229910017582 La2Ti2O7 Inorganic materials 0.000 claims abstract description 18
- 229910003460 diamond Inorganic materials 0.000 claims abstract description 18
- 239000010432 diamond Substances 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000003825 pressing Methods 0.000 claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 5
- 239000010959 steel Substances 0.000 claims abstract description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 4
- 230000005540 biological transmission Effects 0.000 claims abstract description 4
- 239000003921 oil Substances 0.000 claims abstract description 4
- 239000010979 ruby Substances 0.000 claims abstract description 4
- 229910001750 ruby Inorganic materials 0.000 claims abstract description 4
- 239000010703 silicon Substances 0.000 claims abstract description 4
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 4
- 238000005553 drilling Methods 0.000 claims abstract description 3
- 230000001965 increasing effect Effects 0.000 abstract description 11
- 230000003287 optical effect Effects 0.000 abstract description 7
- 239000011941 photocatalyst Substances 0.000 abstract description 5
- 230000033116 oxidation-reduction process Effects 0.000 abstract description 2
- 238000007146 photocatalysis Methods 0.000 abstract description 2
- 239000003054 catalyst Substances 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 239000010936 titanium Substances 0.000 description 16
- 238000000862 absorption spectrum Methods 0.000 description 15
- 230000031700 light absorption Effects 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000006303 photolysis reaction Methods 0.000 description 3
- 230000015843 photosynthesis, light reaction Effects 0.000 description 3
- 238000006722 reduction reaction Methods 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000007373 indentation Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910052805 deuterium Inorganic materials 0.000 description 1
- -1 deuterium halogen Chemical class 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
- 239000002159 nanocrystal Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000000126 substance 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
- 238000002371 ultraviolet--visible spectrum 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
- B01J23/10—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of rare earths
-
- 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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Catalysts (AREA)
Abstract
The invention relates to reinforced La2Ti2O7A method for regulating optical properties of a catalyst by high pressure comprises the steps of selecting a T301 steel sheet as a gasket material, taking silicon oil as a pressure transmission medium, and taking a ruby fluorescence peak as a calibration object of pressure; prepressing a gasket material in a diamond anvil cell, then carrying out laser drilling on the prepressed gasket to form a sample cavity, placing a sample in the sample cavity in the middle of the gasket, and gradually applying pressure to the sample in the sample cavity through a diamond anvil cell device to obtain La with enhanced photocatalytic performance2Ti2O7. The invention provides a method for increasing La2Ti2O7The novel method of optical band gap enhances the oxidation reduction capability and improves the photocatalysis performance,to study La2Ti2O7The photocatalyst of (2) provides a new idea.
Description
Technical Field
The invention belongs to the technical field of high-pressure regulation and control of optical properties, and particularly relates to a method for enhancing La (lanthanum) by using high pressure2Ti2O7Method for photocatalytic performance.
Background
Photocatalytic oxidation technology has attracted the attention of many scholars and enterprises in the past half century of research, and photocatalytic materials that can be applied to large-scale industrial production are the research focus in this field. Although titanium oxide is currently the most successful photocatalytic material, more titanium-containing compounds are also emerging in the art. La2Ti2O7Has good thermal stability and more proper forbidden band width, and becomes a novel photocatalytic material with abundant potential at present. It is known that the most central concept of photocatalysis is that after a photocatalyst absorbs light energy, an electron e with reduction capability is generated-And a hole h having an oxidizing ability+，e-And h+Then contacting with other substances (H)2O, pollutants, heavy metal ions, CO2Etc.) are reduced and oxidized. The redox capability of the photocatalyst is limited, and not all semiconductors capable of exciting electron-hole pairs can be used as a material for hydrogen production by water photolysis. According to electrochemical oxidation-reduction reactions, only the conduction band bottom potential ratio H+/H2Is more negative than the redox potential of (a), the top potential of the valence band is greater than O2/H2The redox-corrected semiconductor material of O can be used for the photolytic hydrogen production and oxygen production reactions. Therefore, the oxidation-reduction capability of the photocatalyst depends on the positions of a conduction band and a valence band, and the more negative the conduction band is, the stronger the reduction capability is; the more positive the valence band, the stronger the oxidation capacity. For example, the conduction band potential of the micron-sized p-type semiconductor CoO is greater than the reduction potential of hydrogen and is not suitable for water photolysis, but the CoO is prepared into a nanocrystal, the energy level position of the conduction band is greatly improved, and the excellent overall water photolysis performance is shown. Therefore, how to increase La2Ti2O7The band gap of (b) is a challenge for scientists to put into practical use. Tradition improved La2Ti2O7The band gap method is mainly realized through a preparation process, and the method needs to control a series of reaction conditions to regulate and control La2Ti2O7Size of or to La2Ti2O7The doping is carried out, the technical difficulty is high, the cost is high, and the success rate is low. Seeking a method with simple steps and convenient operation to increase La2Ti2O7Band gap, La can be increased2Ti2O7The material has photocatalytic performance.
Disclosure of Invention
The invention aims to solve the problem of overcoming the defects in the background technology and provide a reinforced La2Ti2O7Method for photocatalytic performance.
The specific technical scheme of the invention is as follows.
Reinforced La2Ti2O7The method for photocatalytic performance is carried out in a diamond anvil cell under the condition of room temperature, a T301 steel sheet is selected as a gasket material, silicon oil is used as a pressure transmission medium, and a ruby fluorescence peak is used as a calibration object of pressure; prepressing a gasket material in a diamond anvil cell, then carrying out laser drilling on the prepressed gasket to form a sample cavity, placing a sample in the sample cavity in the middle of the gasket, and gradually applying pressure to the sample in the sample cavity through a diamond anvil cell device to obtain La with enhanced photocatalytic performance2Ti2O7。
In the invention, when the diamond anvil device is used for gradually applying pressure to the sample in the sample cavity, the preferable pressure range is 0.9-13.9 GPa.
Has the advantages that:
layered perovskite type La2Ti2O7The photocatalytic activity of the perovskite material is greatly improved compared with that of a typical perovskite material, but the problem of increasing the band gap to enhance the redox capability of the perovskite material is always difficult. The invention provides a method for increasing La2Ti2O7The novel method of optical band gap enhances the redox ability of the optical band gap, improves the photocatalytic performance of the optical band gap, and aims to research La2Ti2O7The photocatalyst of (2) provides a new idea.
Drawings
FIG. 1 is La under the conditions of example 22Ti2O7Ultraviolet visible absorption spectrum.
FIG. 2 is La under the conditions of example 22Ti2O7A band gap.
FIG. 3 shows La under the conditions of example 32Ti2O7Ultraviolet visible absorption spectrum.
FIG. 4 shows La under the conditions of example 32Ti2O7A band gap.
FIG. 5 shows La under the conditions of example 42Ti2O7Ultraviolet visible absorption spectrum.
FIG. 6 is La plotted using origin software in example 42Ti2O7Graph of band gap versus pressure.
FIG. 7 shows La under the conditions of example 52Ti2O7Ultraviolet visible absorption spectrum.
FIG. 8 is La plotted using origin software in example 52Ti2O7Graph of band gap versus pressure.
Detailed Description
In the embodiment of the invention, the ultraviolet visible spectrum test is carried out under the experiment condition of room temperature, a deuterium halogen lamp is used as a light source in the experiment process, and the measured spectrum range is 240-460 nm.
Example 1
The method comprises the steps of debugging a diamond anvil cell device, selecting a T301 steel sheet as a gasket material, pre-pressing the diamond anvil cell device, leaving an indentation on the steel sheet, and punching a hole at the center of the indentation of the gasket in a concentric position by using a laser punching machine, wherein the diameter of the hole is 140 nm. La2Ti2O7The sample is placed in a sealed sample cavity formed by a diamond anvil cell and a gasket, silicon oil is used as a pressure transmission medium, and a ruby fluorescence peak is used as a calibration object of pressure. And (4) applying pressure to the inside of the sample cavity of the anvil device by the diamond, and carrying out ultraviolet and visible light absorption spectrum test.
Example 2
And increasing the pressure in the sample cavity of the diamond anvil cell device from normal pressure to 0.9GPa, and stabilizing for 1min to test the ultraviolet visible light absorption spectrum. Under the pressure condition of 0.9GPa, an absorption peak appears at the wavelength of 264nm, and the band gap value is 3.93 eV. The specific ultraviolet visible absorption spectrum test result is shown in figure 1, and the band gap result is shown in figure 2.
Example 3
And slowly increasing the pressure in the sample cavity of the diamond anvil cell device to 2.6GPa, and stabilizing for 1min to test the ultraviolet visible light absorption spectrum. Under the pressure condition of 2.6GPa, an absorption peak appears at the wavelength of 261nm, and the band gap value is 3.94 eV. The specific ultraviolet-visible absorption spectrum test result is shown in figure 3, and the band gap result is shown in figure 4.
Example 4
The pressure in the sample cavity of the diamond anvil cell device is slowly increased from 0.9GPa to 13.9GPa, and the ultraviolet and visible light absorption spectrums of pressure points such as 4.2GPa, 5.9GPa, 6.8GPa, 7.8GPa, 9.4GPa, 10.1GPa, 11.2GPa, 12.1GPa and the like are taken in the interval range. Within the pressure range of 0.9-13.9GPa, the absorption peak position generates blue shift along with the increase of the pressure. The specific UV-visible absorption spectrum is shown in FIG. 5.
The absorption spectrum of fig. 5 is plotted by origin software as a curve of the variation of the band gap value with pressure, and the specific variation result is shown in fig. 6. As can be seen from FIG. 6, La is present with increasing pressure2Ti2O7The band gap value of the sample gradually increases.
From the above implementation, it can be seen that the present invention is simply implemented by applying La2Ti2O7The La can be increased by applying a certain pressure on the material2Ti2O7So that La2Ti2O7Indicates that La can be enhanced by pressure2Ti2O7The photocatalytic performance of (a).
Example 5
The pressure in the sample cavity of the diamond anvil cell device is continuously and slowly increased to 18.7GPa from 13.9GPa of example 4, and the ultraviolet and visible light absorption spectrums of pressure points such as 14.9GPa, 16.0GPa, 16.9GPa, 17.8GPa and the like are taken in the interval range. The result shows that the absorption peak position is red shifted along with the increase of the pressure in the pressure interval of 13.9-18.7GPa when the pressure is continuously increased. The specific UV-visible absorption spectrum is shown in FIG. 7.
The absorption spectra measured in example 4 and example 5 at different pressures were plotted against the change in band gap value with pressure using origin software, and the results are shown in fig. 8.
It can be found from fig. 8 that in the method of the present invention, the selection of the pressure range is important, and when the pressure is greater than 13.9GPa, La is present2Ti2O7Since the optical band gap of (2) is not increased continuously but gradually decreased, the pressure range of the present invention is preferably 0.9GPa to 13.9 GPa.
Claims (2)
1. Reinforced La2Ti2O7The method for photocatalytic performance is carried out in a diamond anvil cell under the condition of room temperature, a T301 steel sheet is selected as a gasket material, silicon oil is used as a pressure transmission medium, and a ruby fluorescence peak is used as a calibration object of pressure; prepressing a gasket material in a diamond anvil cell, then carrying out laser drilling on the prepressed gasket to form a sample cavity, placing a sample in the sample cavity in the middle of the gasket, and gradually applying pressure to the sample in the sample cavity through a diamond anvil cell device to obtain La with enhanced photocatalytic performance2Ti2O7。
2. A reinforced La according to claim 12Ti2O7The method for photocatalytic performance is characterized in that when the diamond anvil cell device is used for gradually applying pressure to a sample in a sample cavity, the pressure range is 0.9-13.9 GPa.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113189006A (en) * | 2021-05-11 | 2021-07-30 | 吉林大学 | Photoelectric spectral response range regulating and controlling method and system |
| CN115312621A (en) * | 2022-07-29 | 2022-11-08 | 吉林大学 | Increasing BiFeO 3 Method for photoelectric conversion efficiency |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111111645A (en) * | 2019-12-27 | 2020-05-08 | 吉林大学 | Enhanced LiTaO3Photocatalytic method |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111111645A (en) * | 2019-12-27 | 2020-05-08 | 吉林大学 | Enhanced LiTaO3Photocatalytic method |
Non-Patent Citations (1)
| Title |
|---|
| 刘亚子: "钙钛矿型金属氧化物的光催化性能研究", 《赤峰学院学报(自然科学版)》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113189006A (en) * | 2021-05-11 | 2021-07-30 | 吉林大学 | Photoelectric spectral response range regulating and controlling method and system |
| CN115312621A (en) * | 2022-07-29 | 2022-11-08 | 吉林大学 | Increasing BiFeO 3 Method for photoelectric conversion efficiency |
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Application publication date: 20201113 |