CN104437587A - Bismuth-phosphate-based composite photocatalytic material and preparation method thereof - Google Patents
Bismuth-phosphate-based composite photocatalytic material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a bismuth-phosphate-based composite photocatalytic material. The bismuth-phosphate-based composite photocatalytic material comprises fluorine-nitrogen-codoped bismuth phosphate, bismuth tungstate and bismuth vanadate at a molar ratio of 1 to (0.1-0.3) to (0.1-0.3). The invention further discloses a preparation method of the bismuth-phosphate-based composite photocatalytic material. The preparation method comprises the steps of dissolving bismuth nitrate pentahydrate in a nitric acid solution, adding a mixed solution of phosphate, ammonium tungstate, ammonium metavanadate and sodium hydroxide solution, and carrying out microwave hydrothermal reaction, centrifugation and drying, so as to obtain the bismuth-phosphate-based composite photocatalytic material. According to the bismuth-phosphate-based composite photocatalytic material, by virtue of codoping of nonmetal fluorine and nitrogen ions, the capacity for capturing electrons at an interface among three semiconductors including bismuth phosphate, bismuth tungstate and bismuth vanadate is effectively improved, and the migration efficiency of electron holes is increased; the three semiconductors are compounded at the interface and can form a heterogeneous structure, so that the separation of photon-generated carriers is effectively promoted, and the photocatalytic activity of a composite system is improved.
Description
Technical field
The invention belongs to inorganic environment-friendly catalysis material technical field, be specifically related to a kind of phosphoric acid bismuthino composite photocatalyst material, the invention still further relates to the preparation method of this composite photocatalyst material.
Background technology
There is high-quantum efficiency, the preparations and applicatio of the Photocatalytic material with high activity of solar energy can be made full use of, become the hot subject of materialogy, chemistry, the energy and environmental science extensive concern and research.Two key issues in catalysis material research improve the activity of photochemical catalyst and the absorbing wavelength expanding photochemical catalyst, the mentality of designing of thus all novel photocatalysis systems, all carry out for this two problems, from this purpose, novel photocatalysis systems most at present mainly concentrates on composite metal oxide and sulphur, nitrogen substituted compound based on this.The report relating to phosphate catalysis material is little, and phosphate has many characteristics being beneficial to catalytic activity, as phosphate structure good stability, higher relative to its Lacking oxygen Formation energy of metal oxide in light-catalyzed reaction system, this just causes Lacking oxygen defect in phosphate crystal little, namely complex centre quantity is few, and electronics is easily separated with hole, is conducive to the carrying out forming light-catalyzed reaction.Meanwhile, all can there is cavitation corrosion (ZnO, CdS and MoS in most catalysis material
2) and electrical corrosion (GaP, Cu
2o and GaN), and phosphate anion is high-valence state is difficult to be chemically reduced, not easily by photoetch, if the metal ion in phosphate is stable equally, just there is photoetch in this photochemical catalyst under light illumination hardly.And phosphate has larger negative electrical charge, very large inductive effect can be produced, thus be conducive to the transmission of light induced electron.In addition, phosphate surface and water have strong interaction, and according to thermodynamic principles, surface phosphoric acid root, when with hydrone effect, can produce strong effect with the proton in water, and then be conducive to the generation hydroxyl that dissociates of hydrone.
Bismuth phosphate, as the constitutionally stable phosphate semi-conducting material of one, has many application in fields such as the selective catalytic oxidation of optics, alkane, the catalytic oxidations of ammonia.Nearly 2 years, the research relating to bismuth phosphate photocatalyst had been reported, but the energy gap of such photochemical catalyst is comparatively large, can only by ultraviolet excitation, lower to sunshine utilization rate.Therefore, widen the light abstraction width of bismuth phosphate, to the application of bismuth phosphate catalysis material, there is certain scientific meaning.
Summary of the invention
The object of this invention is to provide a kind of phosphoric acid bismuthino composite photocatalyst material, by oxygen vacancy concentration in nonmetallic ion-doped increase bismuth phosphate, bismuth tungstate and pucherite three kinds of semiconductors, and then improve its photocatalytic activity.
Another object of the present invention is to provide a kind of preparation method of phosphoric acid bismuthino composite photocatalyst material.
The technical solution adopted in the present invention is, a kind of phosphoric acid bismuthino composite photocatalyst material, be made up of fluorine, nitrogen co-doped bismuth phosphate, bismuth tungstate and pucherite, wherein the mol ratio of fluorine, nitrogen co-doped bismuth phosphate, bismuth tungstate and pucherite is 1:0.1 ~ 0.3:0.1 ~ 0.3.
Feature of the present invention is also,
In fluorine, nitrogen co-doped phosphoric acid bismuthino composite photocatalyst material, the mol ratio of bismuth ion, fluorine ion and Nitrogen ion is 1:0.5 ~ 1:0.5 ~ 1, and wherein the mol ratio of fluorine ion and Nitrogen ion is 1:1.
Another technical scheme of the present invention is, a kind of preparation method of phosphoric acid bismuthino composite photocatalyst material, specifically comprises the following steps:
Step 1: five water bismuth nitrates are dissolved in the salpeter solution that mass concentration is 65%, obtain solution A; Phosphate, ammonium tungstate and ammonium metavanadate are dissolved in the sodium hydroxide solution that concentration is 1 ~ 2mol/L, obtain solution B; Solution A and solution B are mixed and obtains solution C; Ammonium fluoride is added solution C, obtains solution D;
Step 2: solution D step 1 obtained is transferred to hydrothermal reaction kettle, and be placed in microwave reactor and utilize heating using microwave to 150 ~ 250 DEG C microwave hydrothermal process 1 ~ 3h, room temperature is naturally cooled to after taking-up, by the product centrifugation obtained, deionized water washs 3 times, in 80 DEG C of dry 12h, obtain phosphoric acid bismuthino composite photocatalyst material.
Feature of the present invention is also,
In step 1, the mass ratio of five water bismuth nitrates and nitric acid is 1:5 ~ 10.
In step 1, the mol ratio of phosphate anion, tungstate ion, vanadic acid radical ion and NaOH is 1:0.1 ~ 0.3:0.1 ~ 0.3:1 ~ 4.
In step 1, in solution C, the mol ratio of phosphate anion, tungstate ion, vanadic acid radical ion and bismuth ion is 1:0.1 ~ 0.3:0.1 ~ 0.3:1.3 ~ 1.9.
In step 1, the mol ratio of bismuth ion and ammonium fluoride is 1:0.5 ~ 1.
In step 1, phosphate is one or more combinations of sodium phosphate, dibastic sodium phosphate, sodium dihydrogen phosphate, potassium phosphate, potassium hydrogen phosphate or potassium dihydrogen phosphate.
The invention has the beneficial effects as follows,
1. phosphoric acid bismuthino composite photocatalyst material of the present invention, there is following characteristics: the capture ability the first, effectively being improved bismuth phosphate, bismuth tungstate and pucherite three kinds of interface place electronics by nonmetal fluorine and Nitrogen ion codope, strengthen the transport efficiency of electron hole; The second, oxygen vacancy concentration in bismuth phosphate, bismuth tungstate and pucherite three kinds of semiconductors can be increased by nonmetallic ion-doped, and then improve its light-catalysed photocatalytic activity; Three, the existence of low energy gap width semiconductor bismuth tungstate and pucherite, effectively can improve the absorption characteristic of bismuth phosphate at visible ray; Four, bismuth phosphate, bismuth tungstate and pucherite three kinds of semiconductors coupling can form heterojunction structure in interface, effectively promote the separation of photo-generated carrier, and then improve compound system photocatalytic activity.Therefore, the fluorine that the present invention proposes, nitrogen co-doped bismuth phosphate, bismuth tungstate and pucherite composite photocatalyst material not only can widen optical absorption characteristics, can also improve photocatalytic activity.
2. the preparation method of codope phosphoric acid bismuthino composite photocatalyst material of the present invention, technical process is simple, easy to operate, and compound system component is easy to control.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention is described in detail.
Phosphoric acid bismuthino composite photocatalyst material of the present invention, is made up of fluorine, nitrogen co-doped bismuth phosphate, bismuth tungstate and pucherite, and wherein the mol ratio of fluorine, nitrogen co-doped bismuth phosphate, bismuth tungstate and pucherite is 1:0.1 ~ 0.3:0.1 ~ 0.3.
In fluorine, nitrogen co-doped phosphoric acid bismuthino composite photocatalyst material, the mol ratio of bismuth ion, fluorine ion and Nitrogen ion is 1:0.5 ~ 1:0.5 ~ 1, and wherein the mol ratio of fluorine ion and Nitrogen ion is 1:1.
Phosphoric acid bismuthino composite photocatalyst material of the present invention, there is following characteristics: the capture ability the first, effectively being improved bismuth phosphate, bismuth tungstate and pucherite three kinds of interface place electronics by nonmetal fluorine and Nitrogen ion codope, strengthen the transport efficiency of electron hole; The second, oxygen vacancy concentration in bismuth phosphate, bismuth tungstate and pucherite three kinds of semiconductors can be increased by nonmetallic ion-doped, and then improve its light-catalysed photocatalytic activity; Three, the existence of low energy gap width semiconductor bismuth tungstate and pucherite, effectively can improve the absorption characteristic of bismuth phosphate at visible ray; Four, bismuth phosphate, bismuth tungstate and pucherite three kinds of semiconductors coupling can form heterojunction structure in interface, effectively promote the separation of photo-generated carrier, and then improve compound system photocatalytic activity.Therefore, the fluorine that the present invention proposes, nitrogen co-doped bismuth phosphate, bismuth tungstate and pucherite composite photocatalyst material not only can widen optical absorption characteristics, can also improve photocatalytic activity.
The preparation method of above-mentioned phosphoric acid bismuthino composite photocatalyst material, specifically comprises the following steps:
Step 1: five water bismuth nitrates are dissolved in the salpeter solution that mass concentration is 65%, obtain solution A, wherein the mass ratio of five water bismuth nitrates and nitric acid is 1:5 ~ 10; Phosphate, ammonium tungstate and ammonium metavanadate are dissolved in the sodium hydroxide solution that concentration is 1 ~ 2mol/L, obtain solution B, wherein the mol ratio of phosphate anion, tungstate ion, vanadic acid radical ion and NaOH is 1:0.1 ~ 0.3:0.1 ~ 0.3:1 ~ 4; Solution A and solution B are mixed and obtain solution C, wherein in solution C, the mol ratio of phosphate anion, tungstate ion, vanadic acid radical ion and bismuth ion is 1:0.1 ~ 0.3:0.1 ~ 0.3:1.3 ~ 1.9; Ammonium fluoride is added solution C, obtains solution D, wherein the mol ratio of bismuth ion and ammonium fluoride is 1:0.5 ~ 1;
Step 2: solution D step 1 obtained is transferred to hydrothermal reaction kettle, and be placed in microwave reactor and utilize heating using microwave to 150 ~ 250 DEG C microwave hydrothermal process 1 ~ 3h, room temperature is naturally cooled to after taking-up, by the product centrifugation obtained, deionized water washs 3 times, in 80 DEG C of dry 12h, obtain phosphoric acid bismuthino composite photocatalyst material.
In step 1, phosphate is one or more combinations of the soluble phosphates such as sodium phosphate, dibastic sodium phosphate, sodium dihydrogen phosphate, potassium phosphate, potassium hydrogen phosphate, potassium dihydrogen phosphate.
The preparation method of codope phosphoric acid bismuthino composite photocatalyst material of the present invention, technical process is simple, easy to operate, and compound system component is easy to control.
Embodiment 1
Step 1: 6.31g five water bismuth nitrate is dissolved in the salpeter solution that 31.55g mass concentration is 65%, obtains solution A; 1.64g sodium phosphate, 3.04g ammonium tungstate and 0.12g ammonium metavanadate are dissolved in 20ml, concentration is the sodium hydroxide solution of 1mol/L, obtain solution B; Solution A and solution B are mixed and obtains solution C; 0.48g ammonium fluoride is added solution C, obtains solution D;
Step 2: solution D step 1 obtained is transferred to hydrothermal reaction kettle, and be placed in microwave reactor and utilize heating using microwave to 150 DEG C microwave hydrothermal process 1h, room temperature is naturally cooled to after taking-up, by the product centrifugation obtained, deionized water washs 3 times, in 80 DEG C of dry 12h, obtain phosphoric acid bismuthino composite photocatalyst material.
Prepared by phosphoric acid bismuthino composite photocatalyst material to embodiment 1 and carries out light degradation experiment, selection methyl orange is target contaminant, above-mentioned for 0.02g composite photocatalyst material is added the methyl orange solution that 100mL concentration is 10mg/L, after 100min radiation of visible light (300W xenon lamp), methyl orange degradation efficiency is greater than 90%.
Embodiment 2
Step 1: 9.22g five water bismuth nitrate is dissolved in the salpeter solution that 92.2g mass concentration is 65%, obtains solution A; 1.64g sodium phosphate, 9.12g ammonium tungstate and 0.36g ammonium metavanadate are dissolved in 20ml, concentration is the sodium hydroxide solution of 2mol/L, obtain solution B; Solution A and solution B are mixed and obtains solution C; 0.7g ammonium fluoride is added solution C, obtains solution D;
Step 2: solution D step 1 obtained is transferred to hydrothermal reaction kettle, and be placed in microwave reactor and utilize heating using microwave to 250 DEG C microwave hydrothermal process 3h, room temperature is naturally cooled to after taking-up, by the product centrifugation obtained, deionized water washs 3 times, in 80 DEG C of dry 12h, obtain phosphoric acid bismuthino composite photocatalyst material.
Prepared by phosphoric acid bismuthino composite photocatalyst material to embodiment 2 and carries out light degradation experiment, selection methyl orange is target contaminant, above-mentioned for 0.02g composite photocatalyst material is added the methyl orange solution that 100mL concentration is 10mg/L, after 100min radiation of visible light (300W xenon lamp), methyl orange degradation efficiency is greater than 90%.
Embodiment 3
Step 1: 6.31g five water bismuth nitrate is dissolved in the salpeter solution that 50.48g mass concentration is 65%, obtains solution A; 1.64g sodium phosphate, 6.08g ammonium tungstate and 0.24g ammonium metavanadate are dissolved in 20ml, concentration is the sodium hydroxide solution of 1.5mol/L, obtain solution B; Solution A and solution B are mixed and obtains solution C; 0.48g ammonium fluoride is added solution C, obtains solution D;
Step 2: solution D step 1 obtained is transferred to hydrothermal reaction kettle, and be placed in microwave reactor and utilize heating using microwave to 200 DEG C microwave hydrothermal process 2.5h, room temperature is naturally cooled to after taking-up, by the product centrifugation obtained, deionized water washs 3 times, in 80 DEG C of dry 12h, obtain phosphoric acid bismuthino composite photocatalyst material.
Prepared by phosphoric acid bismuthino composite photocatalyst material to embodiment 3 and carries out light degradation experiment, selection methyl orange is target contaminant, above-mentioned for 0.02g composite photocatalyst material is added the methyl orange solution that 100mL concentration is 10mg/L, after 100min radiation of visible light (300W xenon lamp), methyl orange degradation efficiency is greater than 90%.
Embodiment 4
Step 1: 6.31g five water bismuth nitrate is dissolved in the salpeter solution that 37.86g mass concentration is 65%, obtains solution A; 1.64g sodium phosphate, 9.12g ammonium tungstate and 0.36g ammonium metavanadate are dissolved in 20ml, concentration is the sodium hydroxide solution of 1.8mol/L, obtain solution B; Solution A and solution B are mixed and obtains solution C; 0.7g ammonium fluoride is added solution C, obtains solution D;
Step 2: solution D step 1 obtained is transferred to hydrothermal reaction kettle, and be placed in microwave reactor and utilize heating using microwave to 220 DEG C microwave hydrothermal process 2h, room temperature is naturally cooled to after taking-up, by the product centrifugation obtained, deionized water washs 3 times, in 80 DEG C of dry 12h, obtain phosphoric acid bismuthino composite photocatalyst material.
Prepared by phosphoric acid bismuthino composite photocatalyst material to embodiment 4 and carries out light degradation experiment, selection methyl orange is target contaminant, above-mentioned for 0.02g composite photocatalyst material is added the methyl orange solution that 100mL concentration is 10mg/L, after 100min radiation of visible light (300W xenon lamp), methyl orange degradation efficiency is greater than 90%.
In embodiment 4, phosphate is sodium phosphate, also can be one or more combinations of the soluble phosphates such as sodium phosphate, dibastic sodium phosphate, sodium dihydrogen phosphate, potassium phosphate, potassium hydrogen phosphate, potassium dihydrogen phosphate.
Claims (8)
1. a phosphoric acid bismuthino composite photocatalyst material, is characterized in that, is made up of fluorine, nitrogen co-doped bismuth phosphate, bismuth tungstate and pucherite, and wherein the mol ratio of fluorine, nitrogen co-doped bismuth phosphate, bismuth tungstate and pucherite is 1:0.1 ~ 0.3:0.1 ~ 0.3.
2. phosphoric acid bismuthino composite photocatalyst material according to claim 1, it is characterized in that, in fluorine, nitrogen co-doped phosphoric acid bismuthino composite photocatalyst material, the mol ratio of bismuth ion, fluorine ion and Nitrogen ion is 1:0.5 ~ 1:0.5 ~ 1, and wherein the mol ratio of fluorine ion and Nitrogen ion is 1:1.
3. a preparation method for phosphoric acid bismuthino composite photocatalyst material, is characterized in that, specifically comprises the following steps:
Step 1: five water bismuth nitrates are dissolved in the salpeter solution that mass concentration is 65%, obtain solution A; Phosphate, ammonium tungstate and ammonium metavanadate are dissolved in the sodium hydroxide solution that concentration is 1 ~ 2mol/L, obtain solution B; Solution A and solution B are mixed and obtains solution C; Ammonium fluoride is added solution C, obtains solution D;
Step 2: solution D step 1 obtained is transferred to hydrothermal reaction kettle, and be placed in microwave reactor and utilize heating using microwave to 150 ~ 250 DEG C microwave hydrothermal process 1 ~ 3h, room temperature is naturally cooled to after taking-up, by the product centrifugation obtained, deionized water washs 3 times, in 80 DEG C of dry 12h, obtain phosphoric acid bismuthino composite photocatalyst material.
4. the preparation method of phosphoric acid bismuthino composite photocatalyst material according to claim 3, is characterized in that, in step 1, the mass ratio of five water bismuth nitrates and nitric acid is 1:5 ~ 10.
5. the preparation method of phosphoric acid bismuthino composite photocatalyst material according to claim 3, is characterized in that, in step 1, the mol ratio of phosphate anion, tungstate ion, vanadic acid radical ion and NaOH is 1:0.1 ~ 0.3:0.1 ~ 0.3:1 ~ 4.
6. the preparation method of phosphoric acid bismuthino composite photocatalyst material according to claim 3, it is characterized in that, in step 1, in solution C, the mol ratio of phosphate anion, tungstate ion, vanadic acid radical ion and bismuth ion is 1:0.1 ~ 0.3:0.1 ~ 0.3:1.3 ~ 1.9.
7. the preparation method of phosphoric acid bismuthino composite photocatalyst material according to claim 3, is characterized in that, in step 1, the mol ratio of bismuth ion and ammonium fluoride is 1:0.5 ~ 1.
8. according to the preparation method of the arbitrary described phosphoric acid bismuthino composite photocatalyst material of claim 3 ~ 7, it is characterized in that, in step 1, phosphate is one or more combinations of sodium phosphate, dibastic sodium phosphate, sodium dihydrogen phosphate, potassium phosphate, potassium hydrogen phosphate or potassium dihydrogen phosphate.
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| CN104475139A (en) * | 2014-11-04 | 2015-04-01 | 陕西科技大学 | Co-doped bismuth phosphate-base composite photocatalytic material and preparation method thereof |
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| CN108004526A (en) * | 2017-11-09 | 2018-05-08 | 江苏大学 | A kind of preparation method of phosphorus doping pucherite light anode |
| CN110227519A (en) * | 2019-07-05 | 2019-09-13 | 宿州学院 | A kind of fluorine-ion-doped bismuth phosphate composite catalyst, preparation method and applications |
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