CN106179305A - Visible light-responded photocatalyst Li AlGe2o6and preparation method thereof - Google Patents

Visible light-responded photocatalyst Li AlGe2o6and preparation method thereof Download PDF

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Publication number
CN106179305A
CN106179305A CN201610492938.9A CN201610492938A CN106179305A CN 106179305 A CN106179305 A CN 106179305A CN 201610492938 A CN201610492938 A CN 201610492938A CN 106179305 A CN106179305 A CN 106179305A
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Prior art keywords
photocatalyst
lialge
visible light
preparation
powder
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Chinese (zh)
Inventor
方亮
苏和平
段炼
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Guilin University of Technology
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Guilin University of Technology
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Priority to CN201610492938.9A priority Critical patent/CN106179305A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/002Mixed oxides other than spinels, e.g. perovskite
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/14Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of germanium, tin or lead
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00Catalysts, in general, characterised by their form or physical properties
    • B01J35/30Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
    • B01J35/39Photocatalytic properties
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00Catalysts, in general, characterised by their form or physical properties
    • B01J35/40Catalysts, in general, characterised by their form or physical properties characterised by dimensions, e.g. grain size
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J37/00Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
    • B01J37/0009Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst
    • B01J37/0027Powdering
    • B01J37/0036Grinding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01JCHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2523/00Constitutive chemical elements of heterogeneous 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 discloses the visible light responsive photocatalyst LiAlGe of a kind of high-efficient wide-frequency2O6And preparation method thereof.The chemical constitution formula of this photocatalyst is LiAlGe2O6.The invention also discloses the preparation method of above-mentioned material.The photocatalyst that the present invention obtains has the advantages such as spectral response range width, light conversion efficiency height and good stability.There is decomposition harmful chemical, organic-biological matter and the effect of sterilization under visible light illumination;Additionally preparation method is simple, synthesis temperature is low, low cost, is suitable for commercial production and application.

Description

Visible light-responded photocatalyst Li AlGe2O6And preparation method thereof
Technical field
The present invention relates to a kind of visible light-responded photocatalyst Li AlGe2O6And preparation method thereof, belong to inorganic photocatalysis Material Field.
Background technology
Along with socioeconomic development, people increasingly pay close attention to for the energy and ecological environment, solve energy shortage and ring Environment pollution problem be realize sustainable development, improve people's living standard and safeguard national security in the urgent need to.
From phase late 1970s, there has been proposed and utilize in photocatalyst decomposition water and the pesticide in air and evil The Organic substances such as sordes matter, and the application example such as the self-cleaning scribbling the surface of solids of photocatalyst.Light-catalyzed reaction former Reason be photocatalyst after absorbing higher than the photon of its band-gap energy, generate hole and electronics, these holes and electronics divide Do not carry out oxidation reaction and reduction reaction, reach to decompose harmful chemical, organic-biological matter and the purpose of sterilization.Photocatalyst Having many kinds, the most most representative is titanium dioxide (TiO2), utilize titanium dioxide to the agriculture in water and in air The Organic substance such as medicine and odorant decomposes, but the band gap of titanium dioxide is 3.2eV, only in the ultraviolet shorter than 400nm Just can show activity under the irradiation of line, can only be little to utilize visible ray at indoor or the local work having uviol lamp, This greatly limits the use of titanium dioxide optical catalyst.
In view of photocatalyst practicality in decomposing harmful substances, it is indispensable for utilizing sunlight as light source 's.Irradiate sunlight medium wavelength maximum intensity of visible ray near 500nm to earth's surface, wavelength be 400nm~750nm can The energy in Jian Guang district is about the 43% of sunlight gross energy, so in order to utilize efficiently, the exploitation of bismuth series photocatalyst and Research has been achieved for a series of great achievement, bismuthous complex such as BiVO4、Bi2MoO6、Bi2Mo2O9、Bi2Mo3O12 And Bi2WO4It is in the news and there is good absorption under visible light.A series of niobiums (tantalum) hydrochlorate photocatalyst is higher owing to having Photocatalytic activity and be widely studied.Such as, niobate photocatalyst Pb3Nb4O13、BiNbO4And Bi2MNbO7(M=Al, Ga, In, Y, rare earth element and Fe) etc. and niobium potassium compound oxide photocatalyst such as KNbO3、KNb3O8、K4Nb6O17And K6Nb10.6O30Deng All there is preferable photocatalysis performance, but its intrinsic photocatalytic effect is the most weak in visible-range or does not has activity.
Although photocatalysis research has been carried out the several years, the exploration to visible light-responded photocatalyst is big with exploitation at present Part is the summary of experience drawn by great many of experiments, the most also cannot be from the crystal structure of compound, composition, molecule Predicting its photocatalysis performance in the physicochemical properties such as amount, that therefore reports at present has visible light-responded photocatalyst kind the most very Limited, and also exist that light conversion efficiency is low, synthesis difficulty, poor stability and problem, the research and development such as spectral response range is narrow New preparation method is simple and to have the visible light-responded high efficiency photocatalyst of wideband be that this area scientific and technical personnel thirst for solving always Determine but be difficult to the difficult problem succeeded all the time, which greatly limits extensively application and the development of photocatalyst.We To consisting of LiAlGe2O6And LiAlSi2O6Sample carried out Photocatalytic Performance Study.Found that LiAlGe2O6Band gap length Degree is 2.71eV, has the visible light-responded photocatalysis performance of excellence;LiAlSi2O6For insulator, under ultraviolet irradiation The most do not show activity.
Summary of the invention
It is an object of the invention to provide and a kind of there is visible light-responded photocatalyst Li AlGe2O6And preparation method thereof.
The chemical constitution formula with visible light-responded photocatalyst that the present invention relates to is: LiAlGe2O6
The preparation method of above-mentioned visible light-responded photocatalyst concretely comprises the following steps:
(1) by 99.9% analytically pure chemical raw material Li2CO3、Al2O3And GeO2Powder press LiAlGe2O6Composition claim Amount dispensing.
(2) raw material mixing step (1) prepared, puts in ball grinder, adds zirconia ball and dehydrated alcohol, ball milling 8 Hour, it is mixed and finely ground, takes out and dry, cross 200 mesh sieves.
(3) by the powder of step (2) mix homogeneously 1050~1100 DEG C of pre-burnings, and it is incubated 6 hours, naturally cools to room Temperature, is then pulverized by ball mill and makes average diameter of particles diminish, less than 2 μm, i.e. obtain LiAlGe2O6Powder.
Advantages of the present invention: LiAlGe2O6The visible light-responded wide frequency range of photocatalyst, light conversion efficiency is high and steady Qualitative good, there is decomposition harmful chemical, organic-biological matter and the effect of sterilization under visible light illumination;Additionally preparation method Simply, synthesis temperature low, low cost, be suitable for commercial production and application.
Detailed description of the invention
Present invention will be described in detail below:
1, in order to obtain the composite oxides used in the present invention, prepare powder first by solid-phase synthesis, i.e. Various oxides or carbonate as raw material mix according to target constitutional chemistry metering ratio, more at ambient pressure in air gas Atmosphere synthesizes.
2 in order to effectively utilize light, and the size of the photocatalyst in the present invention, preferably in micron level, is even received Rice corpuscles, and specific surface area is bigger.The oxide powder prepared with solid-phase synthesis, its particle is relatively big and surface area is less, but Can be by ball mill pulverizing means makes particle diameter diminish.
3, the photocatalysis experiment of the present invention is using methyl orange as simulation organic pollution, and its concentration is 20mg/L;Photocatalysis Agent LiAlGe2O6Addition be 1g/L;Light source uses the xenon lamp of 300W, and reactive tank uses the vessel that pyrex is made, logical Wave filter obtains the wavelength light more than 420nm, then irradiates photocatalyst;Catalysis time is set as 60 minutes.
Embodiment 1:
(1) by analytical pure chemical raw material Li2CO3、Al2O3And GeO2Powder press LiAlGe2O6Composition weigh dispensing.
(2) raw material mixing step (1) prepared, puts in ball grinder, adds zirconia ball and dehydrated alcohol, ball milling 8 Hour, it is mixed and finely ground, takes out and dry, cross 200 mesh sieves.
(3) by the powder of step (2) mix homogeneously 1050 DEG C of pre-burnings, and it is incubated 6 hours, naturally cools to room temperature, so Being pulverized by ball mill afterwards makes average diameter of particles diminish, and less than 2 μm, i.e. obtains LiAlGe2O6Powder.
Prepared photocatalyst, under the wavelength radiation of visible light more than 420nm, reaches for 60 minutes to methyl orange clearance To 97.4%.
Embodiment 2:
(1) by analytical pure chemical raw material Li2CO3、Al2O3And GeO2Powder press LiAlGe2O6Composition weigh dispensing.
(2) raw material mixing step (1) prepared, puts in ball grinder, adds zirconia ball and dehydrated alcohol, ball milling 8 Hour, it is mixed and finely ground, takes out and dry, cross 200 mesh sieves.
(3) by the powder of step (2) mix homogeneously 1080 DEG C of pre-burnings, and it is incubated 6 hours, naturally cools to room temperature, so Being pulverized by ball mill afterwards makes average diameter of particles diminish, and less than 2 μm, i.e. obtains LiAlGe2O6Powder.
Prepared photocatalyst, under the wavelength radiation of visible light more than 420nm, reaches for 60 minutes to methyl orange clearance To 98.7%.
Embodiment 3:
(1) by analytical pure chemical raw material Li2CO3、Al2O3And GeO2Powder press LiAlGe2O6Composition weigh dispensing.
(2) raw material mixing step (1) prepared, puts in ball grinder, adds zirconia ball and dehydrated alcohol, ball milling 8 Hour, it is mixed and finely ground, takes out and dry, cross 200 mesh sieves.
(3) by the powder of step (2) mix homogeneously 1100 DEG C of pre-burnings, and it is incubated 6 hours, naturally cools to room temperature, so Being pulverized by ball mill afterwards makes average diameter of particles diminish, and less than 2 μm, i.e. obtains LiAlGe2O6Powder.
Prepared photocatalyst, under the wavelength radiation of visible light more than 420nm, methyl orange clearance is reached by 60min To 98.3%.
The present invention is never limited to above example.The bound of each temperature, interval value can realize the present invention, at this not Enumerate embodiment.
The made photocatalyst powder of above inventive embodiments can be carried on multiple matrix surface.Matrix can be glass Glass, pottery, activated carbon or quartz sand etc., photocatalyst can be carried on matrix surface in the form of a film.

Claims (1)

1. a germanate is as the application of visible light-responded photocatalyst, it is characterised in that the chemical composition of described germanate Formula is LiAlGe2O6
The preparation method of described germanate concretely comprises the following steps:
(1) by analytical pure chemical raw material Li2CO3、Al2O3And GeO2Powder press LiAlGe2O6Composition weigh dispensing;
(2) raw material mixing step (1) prepared, puts in ball grinder, addition zirconia ball and dehydrated alcohol, ball milling 8 hours, It is mixed and finely ground, takes out and dry, cross 200 mesh sieves;
(3) by the powder of step (2) mix homogeneously 1050~1100 DEG C of pre-burnings, and it is incubated 6 hours, naturally cools to room temperature, Then being pulverized by ball mill makes average diameter of particles be less than 2 μm, i.e. obtains LiAlGe2O6Powder.
CN201610492938.9A 2016-06-26 2016-06-26 Visible light-responded photocatalyst Li AlGe2o6and preparation method thereof Pending CN106179305A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102228828A (en) * 2011-04-13 2011-11-02 桂林理工大学 Composite oxide photocatalyst Li2ZnM3O8 and its preparation method
CN103521210A (en) * 2013-10-22 2014-01-22 桂林理工大学 Photocatalyst Bi3Sb3Zn2O14 with visible light response
CN104399449A (en) * 2014-11-21 2015-03-11 桂林理工大学 Photocatalyst Li2GaB3O7 capable of responding to visible light and preparation method of photocatalyst Li2GaB3O7

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102228828A (en) * 2011-04-13 2011-11-02 桂林理工大学 Composite oxide photocatalyst Li2ZnM3O8 and its preparation method
CN103521210A (en) * 2013-10-22 2014-01-22 桂林理工大学 Photocatalyst Bi3Sb3Zn2O14 with visible light response
CN104399449A (en) * 2014-11-21 2015-03-11 桂林理工大学 Photocatalyst Li2GaB3O7 capable of responding to visible light and preparation method of photocatalyst Li2GaB3O7

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
GÜNTHER J. REDHAMMER ET AL.: "Synthetic LiAlGe2O6: The first pyroxene with P21/n symmetry", 《AMERICAN MINERALOGIST》 *

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