CN106391067A - AgI-Ag3PO4/OV-TiO2 compound photocatalyst and preparation method thereof - Google Patents

AgI-Ag3PO4/OV-TiO2 compound photocatalyst and preparation method thereof Download PDF

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Publication number
CN106391067A
CN106391067A CN201610781786.4A CN201610781786A CN106391067A CN 106391067 A CN106391067 A CN 106391067A CN 201610781786 A CN201610781786 A CN 201610781786A CN 106391067 A CN106391067 A CN 106391067A
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tio
agi
catalyst
titanium dioxide
ag3po4
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CN201610781786.4A
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姚伟峰
李洋
王佩福
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Shanghai University of Electric Power
University of Shanghai for Science and Technology
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Shanghai University of Electric Power
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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
    • B01J27/00Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
    • B01J27/14Phosphorus; Compounds thereof
    • B01J35/39

Abstract

The invention discloses an AgI-Ag3PO4/OV-TiO2 compound photocatalyst, which is composed of AgI, Ag3PO4, and OV-TiO2. The invention further provides a preparation method of the compound photocatalyst. The method comprises a step of preparation of an oxygen vacancy type titanium dioxide and a step of preparation of an Ag3PO4/OV-TiO2 compound photocatalyst. The AgI-Ag3PO4/OV-TiO2 compound photocatalyst is obtained by dissolving the prepared Ag3PO4/OV-TiO2 compound photocatalyst in an ethanol solution, adding a NaI solution, performing dark stirring after the reaction is completed, performing reduced-pressure filtration, and performing vacuum drying after washing. The compound photocatalyst prepared from the method is high in reaction activity of photocatalytic degradation of rhodamine B that is an organic pollutant, and has the photocatalytic activity three times as much as that of pure Ag3PO4 in visible light. The use amount of noble metal silver is obviously reduced, and the compound photocatalyst has the same effect on degradation of phenol that is a colorless organic pollutant.

Description

AgI-Ag3PO4/OV-TiO2Composite photo-catalyst and preparation method thereof
Technical field
The invention belongs to materialogy field, it is related to a kind of catalyst, specifically AgI-Ag3PO4/OV-TiO2Complex light Catalyst and preparation method thereof.
Background technology
Silver phosphate/oxygen vacancies type titanium dioxide (Ag3PO4/OV-TiO2) composite photo-catalyst is a kind of in radiation of visible light Under there is the photocatalyst of photocatalytic activity, but its photocatalysis less stable, limit its practical application.
Content of the invention
For above-mentioned technical problem of the prior art, the invention provides AgI-Ag3PO4/OV-TiO2Composite photocatalyst Agent and preparation method thereof, described this composite photo-catalyst and preparation method thereof will solve silver phosphate/oxygen of the prior art Cavity type titanium dioxide (Ag3PO4/OV-TiO2) composite photo-catalyst photocatalysis less stable technical problem.
The invention provides AgI-Ag3PO4/OV-TiO2Composite photo-catalyst, described AgI, Ag3PO4And OV-TiO2's Mol ratio is 1 × 10-3~ 2×10-1:1: 1~5.
Present invention also offers AgI-Ag3PO4/OV-TiO2The preparation method of composite photo-catalyst, comprises the steps:
1)One step preparing oxygen vacancies type titanium dioxide, titanium dioxide is added in a reaction vessel, adds trifluoro Toluene and benzyl alcohol, using the ultraviolet light for 365nm for the wavelength 6 ~ 10 hours, described titanium dioxide, benzotrifluoride and benzene The material ratio of methanol is 1kg:50~70L:7 ~ 9mol, reaction uses dehydrated alcohol and deionized water wash, then by solid after terminating Sample is vacuum dried, then grind into powder obtains oxygen vacancies type titanium dioxide;
2)One preparation Ag3PO4/OV-TiO2The step of composite photo-catalyst, weighs oxygen vacancies type titanium dioxide, is dissolved in anhydrous In ethanol, add AgNO3, described oxygen vacancies type titanium dioxide and AgNO3Mol ratio be 1:1 ~ 5, magnetic under the conditions of lucifuge After power stirs 40 ~ 80 minutes, under continuous stirring containing Na2HPO3·12H2The aqueous solution of O adds, described oxygen vacancies type Titanium dioxide and Na2HPO3·12H2The mol ratio of O is 1:1 ~ 5, stir 3 ~ 8 hours, then sucking filtration, using absolute ethanol washing, Again solid is vacuum dried, obtains Ag3PO4/OV-TiO2Composite photo-catalyst;
3)By the above-mentioned Ag preparing3PO4/OV-TiO2Composite catalyst is dissolved in ethanol solution, and ultrasonic agitation is after 3 ~ 10 minutes, Continuously stirred 0.03 ~ 1 hour on magnetic stirring apparatuss, then NaI solution is added in above-mentioned solution, described Ag3PO4/ OV-TiO2The mol ratio of composite catalyst and NaI solution is 1: 1×10-3~ 2×10-1;Lucifuge stirring 1 ~ 3 after reaction completely Hour, it is vacuum dried after the sucking filtration that then reduces pressure, washing, obtain AgI-Ag3PO4/OV-TiO2Composite photo-catalyst.
Present invention employs a kind of simple sedimentation method, successfully prepare AgI-Ag3PO4/OV-TiO2Composite photocatalyst Agent, the reactivity of prepared composite photo-catalyst photocatalysis degradation organic contaminant rhodamine B is higher, light under visible light Catalysis activity is than pure Ag3PO4Exceed twice, and significantly reduce the usage amount of noble silver, to colourless organic pollution phenol Degraded equally effective.
The present invention compares with prior art, and its technological progress is significant.The present invention is in silver phosphate/oxygen vacancies type titanium dioxide Titanium (Ag3PO4/OV-TiO2) composite photo-catalyst basis on, synthesized a kind of higher high activity silver iodide of stability- Silver phosphate/oxygen defect type titanium dioxide (AgI-Ag3PO4/OV-TiO2) composite photo-catalyst.The preparation method of the present invention is simple, And the photocatalytic activity height of product, good stability are it is not necessary to the equipment of complex and expensive, synthesis condition are gentle.Be conducive to extensive Popularization, can be used for the improvement of the organic pollutions such as dyestuff, phenol.
Brief description
Fig. 1 is the AgI-Ag of the present invention3PO4/OV-TiO2(1:5)The X-ray diffraction of composite photo-catalyst(XRD)Figure.
Fig. 2 is the AgI-Ag of the present invention3PO4/OV-TiO2(1:5)The Flied emission transmission electron microscope picture of composite photo-catalyst.
Fig. 3 is the AgI-Ag of the present invention3PO4/OV-TiO2(1:5)、(1:1)Composite photo-catalyst utilizes as photocatalyst Visible ray(Wavelength is more than 420nm)The active situation of light degradation colored dye, rhodamine B.
Fig. 4 is the color change in dye, rhodamine B solution degradation process.
Fig. 5 is the AgI-Ag of the present invention3PO4/OV-TiO2(1:5)Composite photo-catalyst utilizes visible ray as photocatalyst (Wavelength is more than 420nm)The steadiness of light degradation colored dye, rhodamine B in triplicate.
Fig. 6 is the AgI-Ag of the present invention3PO4/OV-TiO2(1:5)Closing light catalyst utilizes visible ray as photocatalyst (Wavelength is more than 420nm)The active situation of the colourless phenol of light degradation.
Specific embodiment
Embodiment 1
The preparation process of material is as follows:P25 titanium dioxide 1g is moved in 100ml beaker, adds 60ml benzotrifluoride and 8mmol Benzyl alcohol, using the ultraviolet light for 365nm for the wavelength 8 hours.With the solid after dehydrated alcohol and deionized water cyclic washing Sample is vacuum dried, and grind into powder obtains oxygen vacancies type titanium dioxide afterwards(OV-TiO2).
Weigh 0.4g OV-TiO2Powder is dissolved in 180ml dehydrated alcohol and adds 1.019g AgNO3Magnetic under the conditions of lucifuge After power stirs 60 minutes, under continuous stirring containing 0.358g Na2HPO3·12H2The 20ml aqueous solution of O is added dropwise over, and drips , at 1 drop/sec, after being stirred for 5 hours after being added dropwise to complete, sucking filtration, the solid of dehydrated alcohol cyclic washing are in vacuum drying for acceleration 60 degree of dryings of case, obtain the Ag of high light catalysis activity3PO4/OV-TiO2(1:5) composite photo-catalyst.{ weigh 0.08g simultaneously OV-TiO2Powder presses above-mentioned steps, obtains the Ag of high light catalysis activity3PO4/OV-TiO2(1:1) composite photo-catalyst.}
By the above-mentioned Ag preparing3PO4/OV-TiO2(1:5)Composite catalyst takes 0.25g to be dissolved in the ethanol solution of 20ml, surpasses Sound stir 5 minutes after continuously stirred 0.5 hour on magnetic stirring apparatuss, weigh 0.006gNaI and be dissolved in 1ml deionized water then It is added dropwise to above-mentioned solution, be vacuum dried after decompression filtering and washing after lucifuge stirs 2 hours after completion of dropping, obtain AgI- Ag3PO4/OV-TiO2(1:5) composite photo-catalyst.Described AgI-Ag3PO4/OV-TiO2(1:5) X of composite photo-catalyst penetrates Line diffraction(XRD)Figure is as shown in figure 1, Flied emission transmission electron microscope picture is as shown in Figure 2.{ take 0.25g Ag simultaneously3PO4/OV-TiO2 (1:1) composite photo-catalyst is pressed above-mentioned steps and is prepared, and obtains AgI-Ag3PO4/OV-TiO2(1:1) composite photo-catalyst.}
Embodiment 2
By the AgI-Ag obtaining3PO4/OV-TiO2(1:1)、(1:5)Composite visible light catalyst carries out rhodamine B photocatalysis fall Solution.Weigh 0.1g AgI-Ag respectively3PO4/OV-TiO2(1:1)、(1:5)Composite photo catalyst powder adds 100 mL rhodamines In B solution (20 mg/L), lucifuge stirs 60 min, makes rhodamine B solution reach absorption/desorption equilibrium in catalyst surface.So Open light source afterwards and carry out light-catalyzed reaction, reaction certain time takes 4 mL reactant liquors, through ultracentrifugal supernatant, using Shimadzu UV2550 spectrophotometer detects.Become according to the concentration that the change of absorbance at solution 554nm determines rhodamine B in solution Change.Light source utilizes 300W xenon lamp, and making incident illumination using optical filter is visible ray(420nm<λ<800nm).High using 10cm Water layer filters the infrared ray in light source, prevents reacting liquid temperature from raising, and makes light degradation reaction temperature stable in room temperature state.Luo Dan In bright B solution degradation process there is significant change in color, as shown in Figure 3.
Embodiment 3
The degraded situation of rhodamine B is as shown in figure 4, simple Ag3PO4As rhodamine B during photocatalyst in illumination 26 min Substantially completely degrade afterwards, Ag3PO4/OV-TiO2(1:1)、(1:5)Composite is photocatalyst, and rhodamine B is in illumination 16 Substantially completely degrade after min, AgI-Ag3PO4/OV-TiO2(1:1)、(1:5)Composite is photocatalyst, and rhodamine B is in light According to 5 min about after substantially completely degraded show AgI-Ag3PO4/OV-TiO2Composite photo-catalyst has more efficient visible ray Photocatalysis performance.
Embodiment 4
Repeat rhodamine B degradation three times as shown in figure 5, Ag3PO4/OV-TiO2Composite be photocatalyst when, in triplicate after Activity reduces the soonest, works as Ag3PO4Take second place during as photocatalyst, and AgI-Ag3PO4/OV-TiO2Composite is photocatalyst When, still there is after rhodamine B degradation preferable photocatalytic activity in triplicate.
Embodiment 5
Prepared composite photo-catalyst also has the ability of degradation of phenol.As shown in fig. 6, simple Ag3PO4As photocatalysis During agent, phenol is degraded to less than 40%, Ag after illumination 200min3PO4/OV-TiO2(1:5) composite is photocatalyst, phenol In illumination 120min about after be degraded to 35%, and AgI-Ag3PO4/OV-TiO2(1:5)When composite is photocatalyst, phenol 30% just can be degraded to after illumination 60min.

Claims (2)

1. a kind of AgI-Ag3PO4/OV-TiO2Composite photo-catalyst it is characterised in that:By AgI, Ag3PO4And OV-TiO2Composition, Described AgI, Ag3PO4And OV-TiO2Mol ratio be 1 × 10-3~ 2×10-1:1: 1~5.
2. the AgI-Ag described in claim 13PO4/OV-TiO2The preparation method of composite photo-catalyst it is characterised in that include as Lower step:
1)One step preparing oxygen vacancies type titanium dioxide, titanium dioxide is added in a reaction vessel, adds trifluoro Toluene and benzyl alcohol, using the ultraviolet light for 365nm for the wavelength 6 ~ 10 hours, described titanium dioxide, benzotrifluoride and benzene The material ratio of methanol is 1kg:50~70L:7 ~ 9mol, reaction uses dehydrated alcohol and deionized water wash, then by solid after terminating Sample is vacuum dried, then grind into powder obtains oxygen vacancies type titanium dioxide;
2)One preparation Ag3PO4/OV-TiO2The step of composite photo-catalyst, weighs oxygen vacancies type titanium dioxide, is dissolved in anhydrous In ethanol, add AgNO3, described oxygen vacancies type titanium dioxide and AgNO3Mol ratio be 1:1 ~ 5, magnetic under the conditions of lucifuge After power stirs 40 ~ 80 minutes, under continuous stirring containing Na2HPO3·12H2The aqueous solution of O adds, described oxygen vacancies type Titanium dioxide and Na2HPO3·12H2The mol ratio of O is 1:1 ~ 5, stir 3 ~ 8 hours, then sucking filtration, using absolute ethanol washing, Again solid is vacuum dried, obtains Ag3PO4/OV-TiO2Composite photo-catalyst;
3)By the above-mentioned Ag preparing3PO4/OV-TiO2Composite catalyst is dissolved in ethanol solution, and ultrasonic agitation is after 3 ~ 10 minutes, Continuously stirred 0.03 ~ 1 hour on magnetic stirring apparatuss, then NaI solution is added in above-mentioned solution, described Ag3PO4/ OV-TiO2The mol ratio of composite catalyst and NaI solution is 1: 1×10-3~ 2×10-1;Lucifuge stirring 1 ~ 3 after reaction completely Hour, it is vacuum dried after the sucking filtration that then reduces pressure, washing, obtain AgI-Ag3PO4/OV-TiO2Composite photo-catalyst.
CN201610781786.4A 2016-07-01 2016-08-30 AgI-Ag3PO4/OV-TiO2 compound photocatalyst and preparation method thereof Pending CN106391067A (en)

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Cited By (1)

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CN108579775A (en) * 2018-05-15 2018-09-28 浙江大学城市学院 A kind of silver orthophosphate/silver/titanium dioxide nano flower composite material and the preparation method and application thereof

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CN102068999A (en) * 2011-01-11 2011-05-25 中山大学 Application of silver halide composite materials in preparing carbon dioxide into hydrocarbon under visible-light catalysis
CN104258886A (en) * 2014-09-16 2015-01-07 上海电力学院 Silver phosphate/oxygen vacancy type titanium dioxide compound photocatalyst and preparation method thereof

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CN102068999A (en) * 2011-01-11 2011-05-25 中山大学 Application of silver halide composite materials in preparing carbon dioxide into hydrocarbon under visible-light catalysis
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YINGPU BI ET AL.: ""Facile synthesis of rhombic dodecahedral AgX/Ag3PO4(X=Cl,Br,I) heterocrystals with enhanced photocatalytic properties and stabilities"", 《PHYSICAL CHEMISTRY CHEMICAL PHYSICS》 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108579775A (en) * 2018-05-15 2018-09-28 浙江大学城市学院 A kind of silver orthophosphate/silver/titanium dioxide nano flower composite material and the preparation method and application thereof
CN108579775B (en) * 2018-05-15 2020-09-11 浙江大学城市学院 Silver phosphate/silver/titanium dioxide nanoflower composite material and preparation method and application thereof

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