CN102600831A - Graphene-modified bismuth molybdate powder with high photocatalytic activity and preparation method thereof - Google Patents
Graphene-modified bismuth molybdate powder with high photocatalytic activity and preparation method thereof Download PDFInfo
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- CN102600831A CN102600831A CN2010102030465A CN201010203046A CN102600831A CN 102600831 A CN102600831 A CN 102600831A CN 2010102030465 A CN2010102030465 A CN 2010102030465A CN 201010203046 A CN201010203046 A CN 201010203046A CN 102600831 A CN102600831 A CN 102600831A
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Abstract
The invention relates to a graphene-modified bismuth molybdate powder with high photocatalytic activity and a preparation method thereof. The preparation method comprises the following steps of: dispensing graphite oxide into water and carrying out ultrasonic treatment to obtain uniformly dispensed dispersing solution; adding Bi2MoO6 into the dispersing solution, stirring, carrying out ultrasonic treatment and centrifugally drying to obtain bismuth molybdate powder solid products carried on the graphite oxide; adding solid products into deionized water, adding a hydrazine hydrate solution and stronger ammonia water to carry out water bath reaction, cooling, washing and centrifugally drying to obtain a required graphene-modified bismuth molybdate composite material, wherein the graphite oxide is prepared by adopting a Hummer's chemical method. An apparent reaction rate constant k of methylene blue degradation of a product required to be protected is 1-3 times of that of bismuth molybdate matrix powder under a visible light condition. The preparation method of the graphene-modified bismuth molybdate powder with the high photocatalytic activity, disclosed by the invention, is a method capable of obtaining a photocatalyst with high photocatalytic activity through a simpler preparation process.
Description
Technical field
The present invention relates to a kind of Graphene and modify bismuth molybdate nano composite photocatalytic material and preparation method thereof, belong to the photocatalyst material preparing technical field.
Background technology
From TiO in 1972
2Since monocrystalline electrode light decomposition water is in the news; The multiphase photocatalysis material was once once worldwide starting research boom; Obtained bigger progress aspect the difficult degradation pollutant of conductor photocatalysis in removing various surrounding mediums in recent years, shown strong oxidizing property, pollutant mineralising fully, can directly utilize advantage such as sunshine.Therefore how to utilize natural daylight to carry out light-catalyzed reaction efficiently, exploitation can be caused people's interest just day by day by the photochemical catalyst of excited by visible light.Expanding the light abstraction width and the development of new photochemical catalyst of photochemical catalyst, all is the important content of present photocatalysis research.Bismuth molybdate is a kind of important functional material, and tempting application prospect is arranged aspect photocatalytic degradation, and the bismuth molybdate powder preparation method that with the hydrothermal synthesis method is the basis is the preparation method of the more bismuth molybdate photochemical catalyst of utilization at present.At publication number CN101254463A, name is called " a kind of visible light catalyst Bi
2MoO
6Synthetic method " patent application in, a kind of bismuth molybdate photochemical catalyst and preparation method thereof is disclosed, this method is with Bi (NO
3)
35H
2O and (NH
4)
6Mo
7O
244H
2O is a primary raw material, under 160 ℃ of conditions, has prepared flaxen bismuth molybdate photochemical catalyst through hydrothermal synthesis method.But the bismuth molybdate material that utilizes such preparation method to make also exists shortcomings such as photocatalysis efficiency under the visible light condition is lower, and this has brought and must limit to practical application, need utilize other means to improve its photocatalytic activity.
Summary of the invention
The purpose of this invention is to provide a kind of Graphene that under visible light, has highlight catalytic active and modify bismuth molybdate nano composite material and preparation method thereof.With the bismuth molybdate is matrix, utilizes Graphene to modify on the bismuth molybdate surface, thereby constitutes a kind of advanced composite material (ACM) that under visible light, has highlight catalytic active.
Technical conceive of the present invention is such:
Graphene is a kind of carbonaceous new material by the tightly packed one-tenth bi-dimensional cellular of monolayer carbon atom shape lattice structure, and its structure is similar to the CNT that does not curl.Having particular structure characteristic and unusual electric property, is the very promising basic structural unit that constitutes new material.Characteristics according to grapheme material; Graphene has more excellent electronic transmission performance with respect to other conjugated molecular carbon material (like C60 molecule, CNT, graphite); Through the effect of graphene molecules and bismuth molybdate surface chemistry key, the light induced electron that the bismuth molybdate photochemical catalyst produces under radiation of visible light can be transferred to rapidly on the graphene molecules, promotes separating of light induced electron and hole; Increase the photohole amount, thereby increased substantially its photocatalytic activity.
Technical scheme of the present invention is: graphite oxide is distributed in the water, ultrasonic it is peeled off into the graphite oxide sheet, obtain homodisperse dispersion liquid; Afterwards with Bi
2MoO
6Join in the dispersion liquid bismuth molybdate powder solid product that stir, ultrasonic, centrifugal oven dry obtains the graphite oxide load; Then solid product is added in the deionized water, add in hydrazine hydrate solution and the concentrated ammonia liquor, water-bath reacts and finishes the back cooling, after washing, centrifugal oven dry, gets required Graphene and modifies the bismuth molybdate composite; Described graphite oxide is to adopt the oxidation of Hummer ' s chemical method to make by native graphite.
Said preparation method's concrete steps are following:
(1) graphite oxide (GO) is distributed in the water; Then with ultrasonic 30～60 minutes of solution; Graphite oxide is peeled off into the graphite oxide sheet under the effect of electrostatic repulsion; Obtain homodisperse graphite oxide dispersion liquid, wherein graphite oxide is to adopt the oxidation of Hummer ' s chemical method to make by native graphite;
(2) with Bi
2MoO
6Join in the GO dispersion liquid of homogeneous dispersion stirring, the ultrasonic Bi that makes
2MoO
6Be uniformly dispersed, centrifugal after ultrasonic 0.5～1 hour, 80 ℃ of oven dry;
(3) will join in the deionized water through the bismuth molybdate powder of step (2) gained graphite oxide load; The hydrazine hydrate solution and the concentrated ammonia liquor (analyzing pure) that add 35% (percentage by volume) again mix in beaker; Both volume ratios are 1: 7, and the mass ratio of hydrazine hydrate and GO is 7: 10 in the system, and vigorous stirring is after 3～5 minutes; Be placed in 90～95 ℃ of water-baths and react, the graphite oxide that loads on the bismuth molybdate surface is carried out in-situ reducing 1～2h; The time and the temperature of strict control reaction system are the keys that graphite oxide is converted into Graphene.
(4) after reaction finishes, treat the product cooling with deionized water rinsing, centrifugal, 80 ℃ of oven dry promptly obtain required Graphene and modify the bismuth molybdate composite.
The doping of graphite oxide/bismuth molybdate is 0.5%～5% mass percent.
The present invention requires to protect the Graphene with highlight catalytic active to modify the bismuth molybdate powder simultaneously, and its apparent reaction rate constant k that under the visible light condition, methylene blue is degraded than the high 1-3 of bismuth molybdate matrix powder doubly.
The invention has the beneficial effects as follows that adopting local reduction way to prepare Graphene modifies the bismuth molybdate composite, obtains characteristic higher to the organic pollution decomposition efficiency under radiation of visible light; A kind of method that can pass through to obtain than easy manufacture technology the photochemical catalyst of highlight catalytic active is provided.
Description of drawings
The present invention has accompanying drawing 1 width of cloth;
Fig. 1 is the X-ray diffraction spectrogram that bismuth molybdate and Graphene are modified the bismuth molybdate composite.
The specific embodiment
(1) graphite oxide (GO) that takes by weighing 5mg joins in the 10ml deionized water, and the graphite oxide ratio is easier to be distributed in the water, then ultrasonic 30 minutes of solution is peeled off into the graphite oxide sheet with graphite oxide, obtains homodisperse graphite oxide dispersion liquid;
(2) the 1g bismuth molybdate is joined in the graphite oxide dispersion liquid that is made by step (1), stirring, the ultrasonic GO that makes are at Bi
2MoO
6The surface is uniformly dispersed, and is centrifugal after ultrasonic 0.5 hour, 80 ℃ of oven dry.GO/Bi in this experiment
2MoO
6Mass ratio be 0.5%.
(3) will by step (2) make graphite oxide-bismuth molybdate powder add 50ml deionized water, the hydrazine hydrate solution of 10 μ l 35%, 70 μ l concentrated ammonia liquors and in beaker, mix; After the vigorous stirring 3 minutes, be placed in 95 ℃ of water-baths under the condition and reacted 1 hour.
(4) after reaction finishes, treat the product cooling with deionized water rinsing, centrifugal, 80 ℃ of oven dry promptly obtain required Graphene and modify the bismuth molybdate composite.
(1) graphite oxide (GO) that takes by weighing 10mg joins in the 20ml deionized water; The graphite oxide ratio is easier to be distributed in the water; Then ultrasonic 30 minutes of solution is peeled off into the graphite oxide sheet with graphite oxide, obtain homodisperse graphite oxide dispersion liquid;
(2) the 1g bismuth molybdate is joined in the graphite oxide dispersion liquid that is made by step (1), stirring, the ultrasonic GO that makes are at Bi
2MoO
6The surface is uniformly dispersed, and is centrifugal after ultrasonic 0.5 hour, 80 ℃ of oven dry.GO/Bi in this experiment
2MoO
6Mass ratio be 1%.
(3) will by step (2) make graphite oxide-bismuth molybdate powder add 50ml deionized water, the hydrazine hydrate solution of 20 μ l 35%, 140 μ l concentrated ammonia liquors and in beaker, mix; After the vigorous stirring 3 minutes, be placed in 95 ℃ of water-baths under the condition and reacted 1 hour.
(4) after reaction finishes, treat the product cooling with deionized water rinsing, centrifugal, 80 ℃ of oven dry promptly obtain required Graphene and modify the bismuth molybdate composite.
(1) graphite oxide (GO) that takes by weighing 15mg joins in the 30ml deionized water; The graphite oxide ratio is easier to be distributed in the water; Then ultrasonic 30 minutes of solution is peeled off into the graphite oxide sheet with graphite oxide, obtain homodisperse graphite oxide dispersion liquid;
(2) the 1g bismuth molybdate is joined in the graphite oxide dispersion liquid that is made by step (1), stirring, the ultrasonic GO that makes are at Bi
2MoO
6The surface is uniformly dispersed, and is centrifugal after ultrasonic 1 hour, 80 ℃ of oven dry.GO/Bi in this experiment
2MoO
6Mass ratio be 1.5%.
(3) will by step (2) make graphite oxide-bismuth molybdate powder add 50ml deionized water, the hydrazine hydrate solution of 30 μ l 35%, 210 μ l concentrated ammonia liquors and in beaker, mix; After the vigorous stirring 4 minutes, be placed in 90 ℃ of water-baths under the condition and reacted 1.5 hours.
(4) after reaction finishes, treat the product cooling with deionized water rinsing, centrifugal, 80 ℃ of oven dry promptly obtain required Graphene and modify the bismuth molybdate composite.
(1) graphite oxide (GO) that takes by weighing 20mg joins in the 40ml deionized water, and the graphite oxide ratio is easier to be distributed in the water, then ultrasonic 1 hour of solution is peeled off into the graphite oxide sheet with graphite oxide, obtains homodisperse graphite oxide dispersion liquid;
(2) the 1g bismuth molybdate is joined in the graphite oxide dispersion liquid that is made by step (1), stirring, the ultrasonic GO that makes are at Bi
2MoO
6The surface is uniformly dispersed, and is centrifugal after ultrasonic 1 hour, 80 ℃ of oven dry.GO/Bi in this experiment
2MoO
6Mass ratio be 2%.
(3) will by step (2) make graphite oxide-bismuth molybdate powder add 50ml deionized water, the hydrazine hydrate solution of 40 μ l 35%, 280 μ l concentrated ammonia liquors and in beaker, mix; After the vigorous stirring 5 minutes, be placed in 95 ℃ of water-baths under the condition and reacted 1.5 hours.
(4) after reaction finishes, treat the product cooling with deionized water rinsing, centrifugal, 80 ℃ of oven dry promptly obtain required Graphene and modify the bismuth molybdate composite.
The sample that embodiment 1,2,3,4 is obtained is numbered 1# respectively, 2#, and 3#, 4# is numbered 0# with original bismuth molybdate powder, and sample is carried out X-ray diffraction analysis, shows that through XRD result the main crystalline phase of 0#-4# sample still all is γ-Bi
2MoO
6
In order to check prepared Graphene to modify the photocatalytic degradation performance of bismuth molybdate composite, the present invention selects for use methylene blue as the photocatalytic degradation object.Five kinds of samples of 0#-4# are carried out the photocatalytic degradation performance test respectively, estimate with the new preparation catalyst methylene blue in the degradation water (MB) molecule under the visible light condition.Light source is the xenon lamp of 500W, and (λ＞420nm) filters the ultraviolet light below the 420nm with optical filter.With 100mL 10
-5MolL
-1MB solution put into the beaker of 250mL, add the 0.05g photochemical catalyst, ultrasonic dispersions of lucifuge 10min, stirring 20min makes MB reach adsorption equilibrium at catalyst surface.Photocatalytic degradation reaction is carried out in the irradiation of turning on light, the 3mL that takes a sample respectively after 3 hours, and (4000rpm, 10min) the centrifugation catalyst granules is got supernatant, monitors the absorbance of MB with the UV-vis spectrophotometer, and then the change in concentration of MB in the tracking solution with centrifuge.According to first order reaction kinetic to ln (C/C
0)-kt curve carry out linear fit can calculate apparent reaction rate constant k, can judge the height of the photocatalytic activity of photochemical catalyst through the size of k value.The result shows (seeing table 1), and the bismuth molybdate that Graphene is modified has shown higher photocatalytic activity under the visible light condition.
The degradation rate table of comparisons of table 1. pair methylene blue
Claims (3)
1. having the preparation method that the Graphene of highlight catalytic active is modified the bismuth molybdate powder, is that graphite oxide is distributed in the water, ultrasonic it is peeled off into the graphite oxide sheet, obtains homodisperse dispersion liquid; Afterwards with Bi
2MoO
6Join in the dispersion liquid bismuth molybdate powder solid product that stir, ultrasonic, centrifugal oven dry obtains the graphite oxide load; Then solid product is added in the deionized water, add in hydrazine hydrate solution and the concentrated ammonia liquor, water-bath reacts and finishes the back cooling, after washing, centrifugal oven dry, gets required Graphene and modifies the bismuth molybdate composite;
Described graphite oxide is to adopt the oxidation of Hummer ' s chemical method to make by native graphite.
2. the preparation method that the Graphene with highlight catalytic active as claimed in claim 1 is modified the bismuth molybdate powder is characterized in that said preparation method's step is following:
(1) graphite oxide is distributed in the water; Then ultrasonic 30～60 minutes of solution is peeled off into the graphite oxide sheet with graphite oxide; Obtain homodisperse graphite oxide dispersion liquid, described graphite oxide is to adopt the oxidation of Hummer ' s chemical method to make by native graphite;
(2) with Bi
2MoO
6Join in the graphite oxide dispersion liquid of homogeneous dispersion stirring, the ultrasonic Bi that makes
2MoO
6Be uniformly dispersed, centrifugal after ultrasonic 0.5～1 hour, 80 ℃ of oven dry;
(3) will join in the deionized water through the bismuth molybdate powder of step (2) gained graphite oxide load; The hydrazine hydrate solution and the analytically pure ammoniacal liquor that add 35% percentage by volume again mix in beaker; Hydrazine hydrate solution and ammoniacal liquor volume ratio are 1: 7, and the mass ratio of hydrazine hydrate and graphite oxide is 7: 10 in the system, after vigorous stirring 3-5 minute; Be placed in the 90-95 ℃ of water-bath and react, the graphite oxide that loads on the bismuth molybdate surface is carried out in-situ reducing 1-2h;
(4) after reaction finishes, treat the product cooling with deionized water rinsing, centrifugal, 80 ℃ of oven dry promptly obtain required Graphene and modify the bismuth molybdate composite;
The doping of graphite oxide/bismuth molybdate is the 0.5%-5% mass percent.
3. the Graphene that has highlight catalytic active is modified the bismuth molybdate powder, and the apparent reaction rate constant k that under the visible light condition, methylene blue is degraded than the high 1-3 of bismuth molybdate matrix powder doubly.
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|---|---|---|---|---|
| CN103623809A (en) * | 2013-08-27 | 2014-03-12 | 南昌航空大学 | Ternary heterojunction 1%graphene-Bi2MoO6/Bi3.64Mo0.36O6.55 catalyst and preparation method thereof |
| CN103657634A (en) * | 2013-12-31 | 2014-03-26 | 长沙理工大学 | Preparation method of visible light catalysis material for graphene/bismuth molybdate nanobelt |
| CN103779105A (en) * | 2014-02-12 | 2014-05-07 | 东华大学 | Method for preparing nickel molybdate and graphene nanocomposite |
| CN104001498A (en) * | 2014-06-06 | 2014-08-27 | 河南师范大学 | Preparation method of zinc molybdate/graphene composite visible light catalyst |
| CN104478656B (en) * | 2014-11-26 | 2016-02-10 | 广西大学 | A kind of method of carbon dioxide reduction |
| CN105879855A (en) * | 2016-04-27 | 2016-08-24 | 武汉工程大学 | Graphene-gamma-bismuth molybdate nano-composite material, method for preparing same and application of graphene-gamma-bismuth molybdate nano-composite material |
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| CN112221486A (en) * | 2020-11-06 | 2021-01-15 | 生态环境部南京环境科学研究所 | Nano-sheet RGO-flower-shaped multilayer structure Bi2MOO6Heterojunction visible-light-driven photocatalyst and preparation method and application thereof |
| CN113351221A (en) * | 2021-06-08 | 2021-09-07 | 常州大学 | Preparation method and application of graphene-based bismuth-series heterostructure catalyst |
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| CN101254463A (en) * | 2008-04-11 | 2008-09-03 | 南京大学 | Synthetic method of visible light catalyst Bi2MoO6 |
| CN101658786A (en) * | 2009-09-25 | 2010-03-03 | 上海大学 | Method for preparing graphene-based titanium dioxide composite photocatalyst by radiation of electron beams |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101254463A (en) * | 2008-04-11 | 2008-09-03 | 南京大学 | Synthetic method of visible light catalyst Bi2MoO6 |
| CN101658786A (en) * | 2009-09-25 | 2010-03-03 | 上海大学 | Method for preparing graphene-based titanium dioxide composite photocatalyst by radiation of electron beams |
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| CN103623809A (en) * | 2013-08-27 | 2014-03-12 | 南昌航空大学 | Ternary heterojunction 1%graphene-Bi2MoO6/Bi3.64Mo0.36O6.55 catalyst and preparation method thereof |
| CN103623809B (en) * | 2013-08-27 | 2015-08-19 | 南昌航空大学 | A kind of ternary heterojunction 1% Graphene-Bi 2moO 6/ Bi 3.64mo 0.36o 6.55catalysts and its preparation method |
| CN103657634A (en) * | 2013-12-31 | 2014-03-26 | 长沙理工大学 | Preparation method of visible light catalysis material for graphene/bismuth molybdate nanobelt |
| CN103657634B (en) * | 2013-12-31 | 2015-05-06 | 长沙理工大学 | Preparation method of visible light catalysis material for graphene/bismuth molybdate nanobelt |
| CN103779105B (en) * | 2014-02-12 | 2017-01-04 | 东华大学 | A kind of nickel molybdate and the preparation method of graphene nanocomposite material |
| CN103779105A (en) * | 2014-02-12 | 2014-05-07 | 东华大学 | Method for preparing nickel molybdate and graphene nanocomposite |
| CN104001498A (en) * | 2014-06-06 | 2014-08-27 | 河南师范大学 | Preparation method of zinc molybdate/graphene composite visible light catalyst |
| CN104001498B (en) * | 2014-06-06 | 2016-06-08 | 河南师范大学 | The preparation method of a kind of zinc molybdate/Graphene composite visible light catalyst |
| CN104478656B (en) * | 2014-11-26 | 2016-02-10 | 广西大学 | A kind of method of carbon dioxide reduction |
| CN105879855A (en) * | 2016-04-27 | 2016-08-24 | 武汉工程大学 | Graphene-gamma-bismuth molybdate nano-composite material, method for preparing same and application of graphene-gamma-bismuth molybdate nano-composite material |
| CN105879855B (en) * | 2016-04-27 | 2019-05-03 | 武汉工程大学 | A kind of graphene-γ-bismuth molybdate nanocomposite and its preparation method and application |
| CN109195431A (en) * | 2018-10-22 | 2019-01-11 | 中原工学院 | A kind of multilayer, the flower-shaped NiCo of micron2O4/GN/Fe3O4The preparation method of New Radar Absorbing agent |
| CN112221486A (en) * | 2020-11-06 | 2021-01-15 | 生态环境部南京环境科学研究所 | Nano-sheet RGO-flower-shaped multilayer structure Bi2MOO6Heterojunction visible-light-driven photocatalyst and preparation method and application thereof |
| CN113351221A (en) * | 2021-06-08 | 2021-09-07 | 常州大学 | Preparation method and application of graphene-based bismuth-series heterostructure catalyst |
| CN113351221B (en) * | 2021-06-08 | 2023-09-29 | 常州大学 | Preparation method and application of graphene-based bismuth-based heterostructure catalyst |
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