CN111111645A - Enhanced LiTaO3Photocatalytic method - Google Patents
Enhanced LiTaO3Photocatalytic method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 25
- 229910003460 diamond Inorganic materials 0.000 claims abstract description 20
- 239000010432 diamond Substances 0.000 claims abstract description 20
- 230000001699 photocatalysis Effects 0.000 claims abstract description 15
- 229910012463 LiTaO3 Inorganic materials 0.000 claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 5
- 238000004080 punching Methods 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
- 238000003825 pressing Methods 0.000 claims abstract description 3
- 238000007146 photocatalysis Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- 229910052808 lithium carbonate Inorganic materials 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000000446 fuel Substances 0.000 abstract description 10
- 230000000813 microbial effect Effects 0.000 abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 5
- 230000007269 microbial metabolism Effects 0.000 abstract description 3
- 239000010802 sludge Substances 0.000 abstract description 3
- 239000003054 catalyst Substances 0.000 abstract description 2
- 125000006850 spacer group Chemical group 0.000 abstract 1
- 238000000862 absorption spectrum Methods 0.000 description 8
- 238000010521 absorption reaction Methods 0.000 description 5
- 230000031700 light absorption Effects 0.000 description 5
- 239000011941 photocatalyst Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000007373 indentation Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 238000002371 ultraviolet--visible spectrum Methods 0.000 description 2
- 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
- 239000002253 acid Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 229910052805 deuterium Inorganic materials 0.000 description 1
- -1 deuterium halogen Chemical class 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 238000002211 ultraviolet spectrum Methods 0.000 description 1
- 241001300301 uncultured bacterium Species 0.000 description 1
- 238000001429 visible spectrum Methods 0.000 description 1
- 239000002351 wastewater Substances 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
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/20—Vanadium, niobium or tantalum
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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
- B01J23/002—Mixed oxides other than spinels, e.g. perovskite
-
- 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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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G35/00—Compounds of tantalum
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/005—Combined electrochemical biological processes
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/90—Selection of catalytic material
- H01M4/9016—Oxides, hydroxides or oxygenated metallic salts
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/16—Biochemical fuel cells, i.e. cells in which microorganisms function as catalysts
-
- 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
- C02F2101/30—Organic compounds
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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Abstract
The invention relates to an enhanced LiTaO3A photocatalytic method belongs to the technical field of photocatalytic materials. In the diamond anvil cell, T301 steel sheet is selected as the spacer material, silicon oil is used as the pressure transmission medium, and the ruby fluorescence peak is used as the calibration object of pressure(ii) a After punching the gasket, LiTaO is added3Placing a sample in a closed sample cavity consisting of an anvil surface of a diamond anvil cell and a gasket, and applying pressure of 1-10 GPa on the inside of the cavity by using the sample of the diamond anvil cell device to obtain the LiTaO with enhanced photocatalytic activity3A material. The invention can make LiTaO3The material is applied to a microbial fuel cell and used as a cathode catalyst, can degrade organic matters in water or sludge, and converts electrons generated by the organic matters in a microbial metabolism process into current so as to obtain electric energy.
Description
Technical Field
The invention belongs to the technical field of photocatalytic materials, and particularly relates to a reinforced LiTaO3A method of electrocatalytic activity of a material.
Background
The microbial fuel cell is a promising technology for simultaneously generating electricity and treating wastewater, can directly degrade organic matters in water or sludge, and can convert electrons generated by the organic matters in the microbial metabolism process into current so as to obtain electric energy. The characteristic of the output electric energy of the microbial fuel cell is utilized to develop novel energy, the quantitative relation between the current of the microbial fuel cell and organic matters in water is utilized to research a novel sewage quality detection method, and the special environment of the microbial fuel cell is utilized to domesticate microbes with special performance, so that the method has important theoretical significance and application value for the research of the microbial fuel cell. The microbial fuel cell also has application and development prospects in the aspects of replacing energy sources, sensors, new sewage treatment processes and utilizing the special environment of the microbial fuel cell to enrich the uncultured bacteria.
LiTaO3As a novel material, the material has the characteristics of high temperature resistance, strong corrosion resistance, difficult oxidation and the like, and can work in severe environment. But the photocatalytic activity is lower under normal temperature and pressure, so that the application of the photocatalyst in the fields of photocatalysis, fuel cells and the like is limited.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an enhanced LiTaO3A method for photocatalytic activity of a material.
The specific technical scheme of the invention is as follows
Enhanced LiTaO3The photocatalysis method 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 the pressure; after punching the gasket, LiTaO is added3Placing a sample in a closed sample cavity consisting of an anvil surface of a diamond anvil cell and a gasket, and applying pressure of 1-10 GPa on the inside of the cavity by using the sample of the diamond anvil cell device to obtain the LiTaO with enhanced photocatalytic activity3A material.
The LiTaO of the invention3The samples can be prepared as follows: with Li2CO3And Ta2O, heating the mixture in a muffle furnace at 600 ℃ for 48 hours according to the stoichiometric ratio to discharge CO2And then heated at 800 c for 24 hours, after which the sample is rapidly cooled.
Has the advantages that:
LiTaO3the material is a ferroelectric material, belongs to a tantalic acid photocatalyst and has inherent defects which are irrelevant to stoichiometry. This material is reported to be useful for the decomposition of water to produce H2And O2Nitrate reduction and solar-applied photocatalysts. However, conventional photocatalysts have their limitations on ORR, since their photocatalytic efficiency can be affected by a large number of electron-hole recombinations and the occurrence of undesirable back reactions. The invention adopts the common diamond anvil cell device to carry out high-pressure treatment on the anvil cell, so that the absorption capacity of the material is enhanced, and the LiTaO can be prepared by the invention3The material is applied to a microbial fuel cell and used as a cathode catalyst, can degrade organic matters in water or sludge, and converts electrons generated by the organic matters in a microbial metabolism process into current so as to obtain electric energy.
Description of the drawings:
FIG. 1 is LiTaO under the conditions of example 23The material has ultraviolet and visible light absorption spectrum.
FIG. 2 is LiTaO under the conditions of example 23The material bandgap.
FIG. 3 is LiTaO under the conditions of example 33The material has ultraviolet and visible light absorption spectrum.
FIG. 4 is LiTaO under the conditions of example 33The material bandgap.
FIG. 5 is LiTaO under the conditions of example 43The material has ultraviolet and visible light absorption spectrum.
FIG. 6 is LiTaO under the conditions of example 53The material band gap is plotted against pressure.
Detailed Description
In the embodiment of the invention, ultraviolet and visible spectrum tests are carried out at room temperature, deuterium halogen lamps are used as light sources, and the wavelength range is 240-285 nm.
Example 1
Synthesizing pure LiTaO3Grinding the crystal for two hours, selecting a T301 steel sheet as a gasket material, prepressing the anvil by using diamond, and reserving anvil surface indentation, diamond anvil chamfer indentation and diamond anvil side edge indentation of the diamond anvil from the center to the outside on the steel sheet. And (3) punching the anvil surface of the diamond anvil concentrically by using a laser punching machine, wherein the diameter of the hole is 120 nm. And placing the sample in a diamond anvil cell sealed sample cavity, taking silicon oil as a pressure transmission medium, and taking a ruby fluorescence peak as a calibration object of pressure. And (4) gradually increasing the pressure in the sample cavity of the anvil cell device by the diamond, and carrying out ultraviolet and visible light absorption spectrum test.
Example 2
The internal pressure of the sample cavity of the diamond anvil cell device in example 1 was raised to 1GPa, and the uv-vis absorption spectrum was measured for 1min with stability. The measured spectrum range is 240-285 nm, under the condition, an absorption peak appears at a wavelength of 246nm, and the band gap value is 4.639 eV. The specific absorption spectrum test results are shown in fig. 1 and fig. 2.
Example 3
The internal pressure of the sample cavity of the diamond anvil cell device in example 2 was slowly increased to 2GPa, and the UV-visible absorption spectrum was tested for 1 min. Under the condition, an absorption peak appears at the wavelength of 245nm, which shows that under the condition, the absorption peak appears blue shift and the band gap value is reduced, so that LiTaO is caused3The photocatalytic performance of (2) is enhanced. Concrete suctionThe results of the spectroscopic measurements are shown in FIGS. 3 and 4.
Example 4
The pressure in the sample cavity of the diamond anvil cell device in the embodiment 3 is slowly increased from 2GPa to 10GPa, and pressure points such as 3GPa, 4GPa, 5GPa, 6GPa and the like are taken in the range to test the ultraviolet-visible light absorption spectrum. Under these conditions, the absorption peak position shifts blue with increasing pressure. The specific UV-visible absorption spectrum is shown in FIG. 5.
Example 5
The uv-vis absorption spectrum of example 4 was fit to the results of the band gap variation with pressure, see fig. 6. As can be seen from fig. 6, the band gap of the sample gradually decreases with the continued increase in pressure, resulting in LiTaO3The photocatalytic enhancement of (c).
Claims (2)
1. Enhanced LiTaO3The photocatalysis method 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 the pressure; after punching the gasket, LiTaO is added3Placing a sample in a closed sample cavity consisting of an anvil surface of a diamond anvil cell and a gasket, and applying pressure of 1-10 GPa on the inside of the cavity by using the sample of the diamond anvil cell device to obtain the LiTaO with enhanced photocatalytic activity3A material.
2. An enhanced LiTaO according to claim 13The photocatalytic method is characterized in that the LiTaO is3The samples were prepared as follows: with Li2CO3And Ta2O, heating the mixture in a muffle furnace at 600 ℃ for 48 hours according to the stoichiometric ratio to discharge CO2And then heated at 800 c for 24 hours, after which the sample is rapidly cooled.
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| CN201911371869.6A CN111111645A (en) | 2019-12-27 | 2019-12-27 | Enhanced LiTaO3Photocatalytic method |
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| CN201911371869.6A CN111111645A (en) | 2019-12-27 | 2019-12-27 | Enhanced LiTaO3Photocatalytic method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111921518A (en) * | 2020-08-05 | 2020-11-13 | 吉林大学 | Reinforced La2Ti2O7Method for photocatalytic performance |
| CN112028600A (en) * | 2020-09-14 | 2020-12-04 | 吉林大学 | Preparation of paraelectric phase LiTaO3Method (2) |
| CN112062113A (en) * | 2020-09-14 | 2020-12-11 | 吉林大学 | Make NH4H2PO4Antiferroelectric disappearance method |
| CN112062153A (en) * | 2020-09-15 | 2020-12-11 | 吉林大学 | Improve BaZrO3Method of electrical conductivity |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR950006635B1 (en) * | 1992-01-16 | 1995-06-21 | 삼성코닝주식회사 | METHOD OF PREPARATION LiTaO3 POWDER FOR GROWING SINGLE CRYSTAL |
| US20010035123A1 (en) * | 2000-04-03 | 2001-11-01 | Sang-Goo Lee | Ferroelectric single crystal wafer and process for the preparation thereof |
| CN1597097A (en) * | 2004-08-30 | 2005-03-23 | 南京大学 | Preparation method of high specific surface tantalate and niobate photo catalyst |
| CN101351268A (en) * | 2005-12-28 | 2009-01-21 | 株式会社日立制作所 | Catalyst having function of dehydrogenation or hydrogenation, fuel cell employing the catalyst, and apparatus for storing/supplying hydrogen |
| CN101602596A (en) * | 2009-07-24 | 2009-12-16 | 中国地质大学（北京） | A kind of lithium tantalate nano powder and preparation method thereof |
| CN103833079A (en) * | 2014-02-14 | 2014-06-04 | 上海海事大学 | Method for preparation of lithium tantalate nano-powder by hydrothermal process |
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| CN110212169A (en) * | 2019-05-05 | 2019-09-06 | 浙江大学 | A kind of lithium-sulfur cell self-supporting positive electrode and preparation method thereof |
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2019
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111921518A (en) * | 2020-08-05 | 2020-11-13 | 吉林大学 | Reinforced La2Ti2O7Method for photocatalytic performance |
| CN112028600A (en) * | 2020-09-14 | 2020-12-04 | 吉林大学 | Preparation of paraelectric phase LiTaO3Method (2) |
| CN112062113A (en) * | 2020-09-14 | 2020-12-11 | 吉林大学 | Make NH4H2PO4Antiferroelectric disappearance method |
| CN112062153A (en) * | 2020-09-15 | 2020-12-11 | 吉林大学 | Improve BaZrO3Method of electrical conductivity |
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