CN102698777A - Method for preparing Ag/AgCl/BiMg2VO6 composite photocatalyst - Google Patents

Method for preparing Ag/AgCl/BiMg2VO6 composite photocatalyst Download PDF

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CN102698777A
CN102698777A CN2012101702996A CN201210170299A CN102698777A CN 102698777 A CN102698777 A CN 102698777A CN 2012101702996 A CN2012101702996 A CN 2012101702996A CN 201210170299 A CN201210170299 A CN 201210170299A CN 102698777 A CN102698777 A CN 102698777A
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张高科
郭睿
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Wuhan University of Technology WUT
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Abstract

The invention provides a method for preparing an Ag/AgCl/BiMg2VO6 composite photocatalyst with a visible light photocatalytic activity. The method is characterized in by comprising the following steps: obtaining a BiMg2VO6 base material from the raw materials: bismuth nitrate pentahydrate, magnesium nitrate hexahydrate, and ammonium metavanadate, by a sol-gel method; adding BiMg2VO6 into deionized water and then ultrasonically treating the mixed solution; then, slowly dropwise adding 0.1 mol/L silver nitrate solution at a proportion of 1 to 3 mmol/g of Ag/BiMg2VO6 and then ultrasonically treating the mixed solution for 10 min, and stirring the mixed solution for 20 min at room temperature in the dark; slowly adding 0.1 mol/L hydrochloric acid solution into the mixed solution at a mole ratio of 1:1 or 1:2 of H ions in the silver nitrate solution to H ions in the hydrochloric acid solution, ultrasonically treating and stirring the mixed solution to generate a AgCl/BiMg2VO6 composite photocatalyst; and optically reducing the AgCl/BiMg2VO6 composite photocatalyst at an ultraviolet lamp of 20 W to obtain the Ag/AgCl/BiMg2VO6 composite photocatalyst. The composite photocatalyst prepared by the method has a high photocatalytic activity in visible light and a simple preparation process.

Description

Ag/AgCl/BiMg 2VO 6The preparation method of composite photo-catalyst
Technical field
The present invention relates to a kind of Ag/AgCl/BiMg with visible light photocatalysis active 2VO 6The preparation of composite photo-catalyst belongs to photocatalysis and new material technology field.
Background technology
Along with the serious day by day and people of the current environment pollution problem enhancing to environmental protection consciousness, the photocatalyst treatment Dyeing Wastewater has become the focus of catalytic science research.Wherein, TiO 2Semiconductor light-catalyst receives much concern because of characteristics such as its chemical property are stable, oxidisability is strong, nontoxic, cost is low.But because TiO 2To exciting light energy have relatively high expectations and broad can band gap, determined its extinction threshold value to be only limited to the ultra-violet (UV) band, thereby low to the sunshine utilization rate, further limited its practical application.Therefore, develop the hot issue that a kind of novel catalyst that can under visible light, have the high light catalytic activity has become photocatalysis field.
In recent years, through silver halide (AgX, X=Cl, Br, I) composite catalyst of load has good visible light photocatalysis active.Effective separation of carrier makes the silver halide on the carrier can stable existence, has avoided corresponding photoetch.Under the irradiation of light, partially halogenated silver is reduced into argent.Like this, the silver that obtains/silver halide system is owing to its surface plasma bulk effect has strong visible light light absorption, and simultaneously, this system has demonstrated good photocatalysis performance.Such as, human Ag is arranged 2MoO 4With the HCl prepared in reaction AgCl powder, again with the Ag on AgCl surface +Photo-reduction is metal A g 0, obtain the agent of AgAgCl plasma photocatalysis.This catalyst has very high plasma visible absorption effect, is very high, the very stable photochemical catalyst of a kind of visible light activity.
In addition, in visible-light photocatalyst, bismuth-system compound oxide is because performances such as its unique crystal structure and electronic structure also become the important component part in the visible light catalytic material.Among the present invention, we make bismuth-system compound oxide BiMg through Rong Jiao – gel method 2VO 6Yet we find, broad can be with band gap limits its absorbing light scope, suppressed effective separation of its carrier, cause lower photocatalytic activity.Therefore, the present invention modifies BiMg with the Ag/AgCl system 2VO 6, prepare Ag/AgCl/BiMg through the method for Jin Zi – Chen Ji – photo-reduction 2VO 6Composite photo-catalyst utilizes its surface plasma effect, improves visible light photocatalysis active, does not see relevant report as yet about the preparation and the catalytic applications thereof of this composite catalyst at present.
Summary of the invention
The object of the present invention is to provide a kind of Ag/AgCl/BiMg with visible light photocatalysis active 2VO 6The preparation method of composite photo-catalyst, composite photo-catalyst photocatalysis performance under visible light of this method preparation is good, and the preparation process is simple.
For realizing above-mentioned purpose, the technical scheme that the present invention taked is Ag/AgCl/BiMg 2VO 6The preparation method of composite photo-catalyst is characterized in that it comprises the steps:
1) mol ratio by five water bismuth nitrates, magnesium nitrate hexahydrate and ammonium metavanadate is 1:2:1, takes by weighing five water bismuth nitrates, magnesium nitrate hexahydrate and ammonium metavanadate, and is subsequent use; Mol ratio by Bi ion in the five water bismuth nitrates and citric acid is 1:4, takes by weighing citric acid; Mol ratio by citric acid and chelating agent EDTA (ethylenediamine tetra-acetic acid) is 3:2, takes by weighing chelating agent EDTA);
Proportioning by citric acid and deionized water is 0.072 mol:30 mL, and citric acid is added in the deionized water, adds 0.018 mol, five water bismuth nitrates again, places 80 ℃ of heated and stirred, obtains the mixed solution of milky five water bismuth nitrates and citric acid;
Proportioning by chelating agent EDTA and ammoniacal liquor is 0.048 mol:30 mL, and chelating agent EDTA is slowly mixed with ammoniacal liquor, obtains the mixed solution of chelating agent EDTA and ammoniacal liquor;
Proportioning by magnesium nitrate hexahydrate and deionized water is 0.036 mol:30 mL, and magnesium nitrate hexahydrate is added in the deionized water, obtains magnesium nitrate hexahydrate solution; Proportioning by ammonium metavanadate and deionized water is 0.018 mol:30 mL, and ammonium metavanadate is added in the deionized water, obtains ammonium metavanadate solution;
The mixed solution of chelating agent EDTA and ammoniacal liquor is slowly dripped in the mixed solution of five water bismuth nitrates and citric acid, place 80 ℃ of following heated and stirred, until forming water white bismuthic acid solution;
The magnesium nitrate hexahydrate solution for preparing, ammonium metavanadate solution are added respectively in the above-mentioned bismuthic acid solution, and lasting heated and stirred 3-5 h under 80 ℃ obtains blue jelly, at 200 ℃ of heating 1 h that delay time down, obtains pitchy BiMg then 2VO 6The matrix material precursor;
With above-mentioned precursor difference coking 2 h under 300 ℃ and 350 ℃, after the grinding evenly,, obtain yellow BiMg at 800 ℃ of following roasting 4 h 2VO 6Matrix material;
2) press BiMg 2VO 6The proportioning of matrix material and deionized water is 0.5 g:30 mL, with BiMg 2VO 6Matrix material joins in the deionized water, and ultrasonic 10 min obtain BiMg 2VO 6Suspension;
Press Ag ion/BiMg in the liquor argenti nitratis ophthalmicus 2VO 6The ratio of matrix material is 1-3 mmol/g, at above-mentioned BiMg 2VO 6Slowly drip 0.1 mol/L liquor argenti nitratis ophthalmicus in the suspension, ultrasonic 10 min, and do not have in room temperature and to stir 20 min under the optical condition;
3) mol ratio by H ion in Ag ion and the hydrochloric acid solution in the liquor argenti nitratis ophthalmicus is respectively 1:1 or 1:2, adds 0.1 mol/L hydrochloric acid solution, and ultrasonic 10 min do not have stirring 20 min under the optical condition in room temperature, promptly generate AgCl/BiMg 2VO 6Composite photo-catalyst;
4) photo-reduction AgCl/BiMg under 20 W uviol lamps 2VO 6Composite photo-catalyst 0.5 h, the part A g of AgCl particle surface +Photo-reduction is metal A g 0, with deionized water wash, sample separation, and dry in 80 ℃ constant temperature oven, promptly obtain Ag/AgCl/BiMg 2VO 6Composite photo-catalyst.
Thinking of the present invention is at first to prepare BiMg through Rong Jiao – gel method 2VO 6Matrix material is a raw material with silver nitrate and hydrochloric acid solution again, utilizes the method for Jin Zi – Chen Ji – photo-reduction to prepare Ag/AgCl/BiMg 2VO 6Composite photo-catalyst.
Ag/AgCl/BiMg 2VO 6The preparation method of composite photo-catalyst slowly drips certain density silver nitrate and hydrochloric acid solution in BiMg respectively 2VO 6In the aqueous suspension, owing to introduced silver ion and chlorion, so generated AgCl/BiMg 2VO 6Composite photo-catalyst utilizes UV-irradiation AgCl/BiMg then 2VO 6Composite photo-catalyst makes wherein part Ag +Photo-reduction is metal A g 0, promptly obtain Ag/AgCl/BiMg 2VO 6Composite photo-catalyst.
Prepared Ag/AgCl/BiMg 2VO 6The visible light photocatalysis active of composite photo-catalyst characterizes through the visible light photocatalytic degradation Acid Red G.Experimentation is following: the initial concentration of Acid Red G is 50mg/L, simulates visible light source with 300 W dysprosium lamps, and filters out the ultraviolet light below wavelength 420 nm with optical filter.The catalyst that takes by weighing 0.05 g during experiment adds 100 mL Acid Red G solutions simulate waste water from dyestuff in the beaker of 500 mL, add magnet rotor then, puts into photo catalysis reactor.Earlier carry out lucifuge with magnetic stirring apparatus and stir 30 min, contact so that catalyst reaches sufficient with solution, sampling once.Then open 300 W dysprosium lamps simulation visible light source (λ >=420 nm), sampling once detects the concentration of organic wastewater in the solution, to estimate the degradation effect of this photochemical catalyst behind certain hour.
The invention has the beneficial effects as follows:
1) BiMg 2VO 6Matrix material be with five water bismuth nitrates, magnesium nitrate and ammonium metavanadate as raw material, make chelating agent with citric acid and ethylenediamine tetra-acetic acid, adopt a kind of simple, Rong Jiao – gel method at a low price, be prepared from low temperatures.It has overcome, and solid phase method sintering reaction temperature is high, the problem of powder sintering poor activity, compares with hydro-thermal method and has advantages such as technology is simple, handling safety, reaction temperature is lower, the time is short, cost is low, the powder crystallization degree is good.
2) among this preparation method, with the Ag/AgCl nanoparticle deposition in BiMg 2VO 6Substrate material surface utilizes the surface plasma effect, make photochemical catalyst after compound have narrower can band gap (2.2 eV), in very wide solar spectrum scope, absorption is arranged all.Thereby under visible light (λ>=420 nm) irradiation, Ag/AgCl/BiMg 2VO 6Composite photo-catalyst can high efficiency photocatalysis the degraded Acid Red G, have good photocatalytic activity.
Description of drawings
Fig. 1 is the XRD figure (a:BiMg of different catalysts 2VO 6, b:Ag/AgCl/BiMg 2VO 6).
Fig. 2 is the influence figure of different catalysts to the Acid Red G photocatalysis performance.
The specific embodiment
In order to understand the present invention better, further illustrate content of the present invention below in conjunction with embodiment, but content of the present invention not only is confined to following embodiment.
Embodiment 1
Ag/AgCl/BiMg with visible light photocatalysis active 2VO 6The preparation method of composite photo-catalyst, it may further comprise the steps:
1) gets 0.072 mol (i.e. 15.1301 g) citric acid and be added in the 30 mL deionized waters, again 0.018 mol (i.e. 8.7318 g), five water bismuth nitrates are added, place 80 ℃ of heated and stirred, obtain milky white solution A; Get 0.048 mol (promptly 14.0275 g are about 14 g) chelating agent EDTA and add in the 30 mL ammoniacal liquor, stirring and dissolving adds in the above-mentioned solution A then, and in 80 ℃ of following heated and stirred, until forming water white bismuthic acid solution;
Get 0.036 mol (9.2308 g) magnesium nitrate hexahydrate and 0.018 mol (2.1058 g) ammonium metavanadate; Be added to separately in the 30 mL deionized waters, the magnesium nitrate hexahydrate solution and the ammonium metavanadate solution that obtain add respectively in the above-mentioned bismuthic acid solution again; Lasting heated and stirred 3-5 h under 80 ℃; Obtain blue jelly, at 200 ℃ of heating 1 h that delay time down, obtain pitchy BiMg then 2VO 6The matrix material precursor;
With above-mentioned precursor difference coking 2 h under 300 ℃ and 350 ℃, after the grinding evenly,, make yellow BiMg at 800 ℃ of following roasting 4 h 2VO 6Matrix material (yellow BiMg 2VO 6Photochemical catalyst);
2) get 0.5 g BiMg 2VO 6Matrix material is added to 30 mL deionized waters, and ultrasonic 10 min obtain BiMg 2VO 6Suspension;
Press Ag ion/BiMg in the liquor argenti nitratis ophthalmicus 2VO 6The ratio of matrix material is 2 mmol/g, at above-mentioned BiMg 2VO 6Slowly dripping 10 mL concentration in the suspension is the liquor argenti nitratis ophthalmicus of 0.1 mol/L, ultrasonic 10 min, and do not have in room temperature and to stir 20 min under the optical condition;
3) mol ratio by H ion in Ag ion and the hydrochloric acid solution in the liquor argenti nitratis ophthalmicus is respectively 1:1, and slowly adding 10 mL concentration is the hydrochloric acid solution of 0.1 mol/L, and ultrasonic 10 min do not have stirring 20 min under the optical condition in room temperature, promptly generate AgCl/BiMg 2VO 6Composite photo-catalyst;
4) photo-reduction AgCl/BiMg under 20 W uviol lamps 2VO 6Composite photo-catalyst 0.5 h, the part A g of AgCl particle surface +Photo-reduction is metal A g 0, with deionized water repeated water washing, sample separation (washing, separate 3 times), and 80 ℃ constant temperature red mutually in drying, promptly obtain Ag/AgCl/BiMg 2VO 6Composite photo-catalyst.
The Ag/AgCl/BiMg that this embodiment synthesizes 2VO 6Composite photo-catalyst is in the experiment of degraded Acid Red G, and dosage is 0.5 g/L, and the concentration of Acid Red G is 50 mg/L, the wavelength X of irradiates light>=420 nm, and the degradation rate of Acid Red G is 95.9% behind 2 h, and the Ag/AgCl/BiMg of the method preparation is described 2VO 6Composite photo-catalyst has good photocatalytic activity (having visible light photocatalysis active).
Ag/AgCl/BiMg 2VO 6The XRD figure of composite photo-catalyst spectrum (as shown in Figure 1) shows, the BiMg for preparing through Rong Jiao – gel method 2VO 6Matrix material after the Zai Jin Zi – Chen Ji – photo-reduction, the crystalline phase of AgCl (JCPDS No.31 – 1238) and metal A g (JCPDS No.01 – 1164) occurred, and after this explanation process ultraviolet light photo-reduction, the silver ion reduction of a part has become silver atoms.
For the influence of the Ag/AgCl nano particle of studying deposition, compared the influence (as shown in Figure 2) of different catalysts to the Acid Red G photocatalysis performance to photocatalysis performance.C and C 0Be respectively the concentration in the initial sum course of reaction of Acid Red G.The result shows that Acid Red G has stronger stability, is difficult for light and decomposes; Catalyst does not have tangible suction-operated to Acid Red G yet under no optical condition; BiMg 2VO 6Matrix material does not almost have Photocatalytic Activity for Degradation active to Acid Red G under visible light; The Ag/AgCl nano particle of load degradation rate to Acid Red G in 2 h does not have only 41.4% yet, and the Ag/AgCl/BiMg for preparing through Jin Zi – Chen Ji – photoreduction met hod 2VO 6Composite photo-catalyst then reaches more than 95% the degradation rate of Acid Red G, and its photocatalytic activity is higher than BiMg far away 2VO 6And Ag/AgCl, the composite photo-catalyst after this explanation load, its surface plasma effect helps the carrying out of light-catalyzed reaction.
Embodiment 2
Ag/AgCl/BiMg with visible light photocatalysis active 2VO 6The preparation method of composite photo-catalyst, it may further comprise the steps:
1) preparation BiMg 2VO 6The step 1) of the process of matrix material and embodiment 1 is in full accord;
2) get 0.5 g BiMg 2VO 6Matrix material is added to 30 mL deionized waters, and ultrasonic 10 min obtain BiMg 2VO 6Suspension;
Press Ag ion/BiMg in the liquor argenti nitratis ophthalmicus 2VO 6The ratio of matrix material is 1 mmol/g, at above-mentioned BiMg 2VO 6In the suspension slowly Dropwise 5 mL concentration be the liquor argenti nitratis ophthalmicus of 0.1 mol/L, ultrasonic 10 min, and do not have in room temperature and to stir 20 min under the optical condition;
3) mol ratio by H ion in Ag ion and the hydrochloric acid solution in the liquor argenti nitratis ophthalmicus is respectively 1:1, and slowly adding 5 mL concentration is the hydrochloric acid solution of 0.1 mol/L, and ultrasonic 10 min do not have stirring 20 min under the optical condition in room temperature, promptly generate AgCl/BiMg 2VO 6Composite photo-catalyst;
4) photo-reduction AgCl/BiMg under 20 W uviol lamps 2VO 6Composite photo-catalyst 0.5 h, the part A g of AgCl particle surface +Photo-reduction is metal A g 0, with deionization repeated water washing, sample separation (washing, separate 3 times), and 80 ℃ constant temperature red mutually in drying, promptly obtain Ag/AgCl/BiMg 2VO 6Composite photo-catalyst.
The Ag/AgCl/BiMg that this embodiment synthesizes 2VO 6Composite photo-catalyst is in the experiment of degraded Acid Red G, and dosage is 0.5 g/L, and the concentration of Acid Red G is 50 mg/L, the wavelength X of irradiates light>=420 nm, and the degradation rate of Acid Red G is 85.9% behind 2 h, and the Ag/AgCl/BiMg of the method preparation is described 2VO 6Composite photo-catalyst has good photocatalytic activity.
Embodiment 3
Ag/AgCl/BiMg with visible light photocatalysis active 2VO 6The preparation method of composite photo-catalyst, it may further comprise the steps:
1) preparation BiMg 2VO 6The step 1) of the process of matrix material and embodiment 1 is in full accord;
2) get 0.5 gBiMg 2VO 6Matrix material is added to 30 mL deionized waters, and ultrasonic 10 min obtain BiMg 2VO 6Suspension;
Press Ag ion/BiMg in the liquor argenti nitratis ophthalmicus 2VO 6The ratio of matrix material is 3 mmol/g, at above-mentioned BiMg 2VO 6Slowly dripping 15 mL concentration in the suspension is the liquor argenti nitratis ophthalmicus of 0.1 mol/L, ultrasonic 10 min, and do not have in room temperature and to stir 20 min under the optical condition;
3) mol ratio by H ion in Ag ion and the hydrochloric acid solution in the liquor argenti nitratis ophthalmicus is respectively 1:1, and slowly adding 15 mL concentration is the hydrochloric acid solution of 0.1 mol/L, and ultrasonic 10 min do not have stirring 20 min under the optical condition in room temperature, promptly generate AgCl/BiMg 2VO 6Composite photo-catalyst;
4) photo-reduction AgCl/BiMg under 20 W uviol lamps 2VO 6Composite photo-catalyst 0.5 h, the part A g of AgCl particle surface +Photo-reduction is metal A g 0, with deionization repeated water washing, sample separation (washing, separate 3 times), and 80 ℃ constant temperature red mutually in drying, promptly obtain Ag/AgCl/BiMg 2VO 6Composite photo-catalyst.
The Ag/AgCl/BiMg that this embodiment synthesizes 2VO 6Composite photo-catalyst is in the experiment of degraded Acid Red G, and dosage is 0.5 g/L, and the concentration of Acid Red G is 50 mg/L, the wavelength X of irradiates light>=420 nm, and the degradation rate of Acid Red G is 91.7% behind 2 h, and the Ag/AgCl/BiMg of the method preparation is described 2VO 6Composite photo-catalyst has good photocatalytic activity.
Embodiment 4
Ag/AgCl/BiMg with visible light photocatalysis active 2VO 6The preparation method of composite photo-catalyst, it may further comprise the steps:
1) preparation BiMg 2VO 6The step 1) of the process of matrix material and embodiment 1 is in full accord;
2) get 0.5 gBiMg 2VO 6Matrix material is added to 30 mL deionized waters, and ultrasonic 10 min obtain BiMg 2VO 6Suspension;
Press Ag ion/BiMg in the liquor argenti nitratis ophthalmicus 2VO 6The ratio of matrix material is 2 mmol/g, at above-mentioned BiMg 2VO 6Slowly dripping 10 mL concentration in the suspension is the liquor argenti nitratis ophthalmicus of 0.1 mol/L, ultrasonic 10 min, and do not have in room temperature and to stir 20 min under the optical condition;
3) mol ratio by H ion in Ag ion and the hydrochloric acid solution in the liquor argenti nitratis ophthalmicus is respectively 1:2, and slowly adding 20 mL concentration is the hydrochloric acid solution of 0.1 mol/L, and ultrasonic 10 min do not have stirring 20 min under the optical condition in room temperature, promptly generate AgCl/BiMg 2VO 6Composite photo-catalyst;
4) photo-reduction AgCl/BiMg under 20 W uviol lamps 2VO 6Composite photo-catalyst 0.5 h, the part A g of AgCl particle surface +Photo-reduction is metal A g 0, with deionization repeated water washing, sample separation (washing, separate 3 times), and 80 ℃ constant temperature red mutually in drying, promptly obtain Ag/AgCl/BiMg 2VO 6Composite photo-catalyst.
The Ag/AgCl/BiMg that this embodiment synthesizes 2VO 6Composite photo-catalyst is in the experiment of degraded Acid Red G, and dosage is 0.5 g/L, and the concentration of Acid Red G is 50 mg/L, the wavelength X of irradiates light>=420 nm, and the degradation rate of Acid Red G is 94.3% behind 2 h, and the Ag/AgCl/BiMg of the method preparation is described 2VO 6Composite photo-catalyst has good photocatalytic activity.

Claims (1)

1.Ag/AgCl/BiMg 2VO 6The preparation method of composite photo-catalyst is characterized in that it comprises the steps:
1) mol ratio by five water bismuth nitrates, magnesium nitrate hexahydrate and ammonium metavanadate is 1:2:1, takes by weighing five water bismuth nitrates, magnesium nitrate hexahydrate and ammonium metavanadate, and is subsequent use; Mol ratio by Bi ion in the five water bismuth nitrates and citric acid is 1:4, takes by weighing citric acid; Mol ratio by citric acid and chelating agent EDTA (ethylenediamine tetra-acetic acid) is 3:2, takes by weighing chelating agent EDTA;
Proportioning by citric acid and deionized water is 0.072 mol:30 mL, and citric acid is added in the deionized water, adds 0.018 mol, five water bismuth nitrates again, places 80 ℃ of heated and stirred, obtains the mixed solution of milky five water bismuth nitrates and citric acid;
Proportioning by chelating agent EDTA and ammoniacal liquor is 0.048 mol:30 mL, and chelating agent EDTA is mixed with ammoniacal liquor, obtains the mixed solution of chelating agent EDTA and ammoniacal liquor;
Proportioning by magnesium nitrate hexahydrate and deionized water is 0.036 mol:30 mL, and magnesium nitrate hexahydrate is added in the deionized water, obtains magnesium nitrate hexahydrate solution; Proportioning by ammonium metavanadate and deionized water is 0.018 mol:30 mL, and ammonium metavanadate is added in the deionized water, obtains ammonium metavanadate solution;
The mixed solution of chelating agent EDTA and ammoniacal liquor is dripped in the mixed solution of five water bismuth nitrates and citric acid, place 80 ℃ of following heated and stirred, until forming water white bismuthic acid solution;
The magnesium nitrate hexahydrate solution for preparing, ammonium metavanadate solution are added respectively in the above-mentioned bismuthic acid solution, and lasting heated and stirred 3-5 h under 80 ℃ obtains blue jelly, at 200 ℃ of heating 1 h that delay time down, obtains pitchy BiMg then 2VO 6The matrix material precursor;
With above-mentioned BiMg 2VO 6The matrix material precursor is difference coking 2 h under 300 ℃ and 350 ℃, after the grinding evenly, at 800 ℃ of following roasting 4 h, obtain yellow BiMg 2VO 6Matrix material;
2) press BiMg 2VO 6The proportioning of matrix material and deionized water is 0.5 g:30 mL, with BiMg 2VO 6Matrix material joins in the deionized water, and ultrasonic 10 min obtain BiMg 2VO 6Suspension;
Press Ag ion/BiMg in the liquor argenti nitratis ophthalmicus 2VO 6The ratio of matrix material is 1-3 mmol/g, at above-mentioned BiMg 2VO 6Drip 0.1 mol/L liquor argenti nitratis ophthalmicus in the suspension, ultrasonic 10 min, and do not have in room temperature and to stir 20 min under the optical condition;
3) mol ratio by H ion in Ag ion and the hydrochloric acid solution in the liquor argenti nitratis ophthalmicus is respectively 1:1 or 1:2, adds 0.1 mol/L hydrochloric acid solution, and ultrasonic 10 min do not have stirring 20 min under the optical condition in room temperature, promptly generate AgCl/BiMg 2VO 6Composite photo-catalyst;
4) photo-reduction AgCl/BiMg under 20 W uviol lamps 2VO 6Composite photo-catalyst 0.5 h, the part A g of AgCl particle surface +Photo-reduction is metal A g 0, with deionized water wash, sample separation, and dry in 80 ℃ constant temperature oven, promptly obtain Ag/AgCl/BiMg 2VO 6Composite photo-catalyst.
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