CN112473700A - Preparation method and application of bismuth oxybromide/biochar composite visible-light-driven photocatalyst - Google Patents
Preparation method and application of bismuth oxybromide/biochar composite visible-light-driven photocatalyst Download PDFInfo
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- CN112473700A CN112473700A CN202011415655.7A CN202011415655A CN112473700A CN 112473700 A CN112473700 A CN 112473700A CN 202011415655 A CN202011415655 A CN 202011415655A CN 112473700 A CN112473700 A CN 112473700A
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- OZKCXDPUSFUPRJ-UHFFFAOYSA-N oxobismuth;hydrobromide Chemical compound Br.[Bi]=O OZKCXDPUSFUPRJ-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 239000002131 composite material Substances 0.000 title claims abstract description 31
- 239000011941 photocatalyst Substances 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title claims abstract description 25
- 239000002957 persistent organic pollutant Substances 0.000 claims abstract description 9
- 238000000498 ball milling Methods 0.000 claims abstract description 7
- 230000000593 degrading effect Effects 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract 3
- 239000000843 powder Substances 0.000 claims description 30
- 239000003610 charcoal Substances 0.000 claims description 29
- FBXVOTBTGXARNA-UHFFFAOYSA-N bismuth;trinitrate;pentahydrate Chemical compound O.O.O.O.O.[Bi+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O FBXVOTBTGXARNA-UHFFFAOYSA-N 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 239000008367 deionised water Substances 0.000 claims description 8
- 229910021641 deionized water Inorganic materials 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 6
- 239000003054 catalyst Substances 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 4
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 3
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 3
- 239000011425 bamboo Substances 0.000 claims description 3
- 238000001354 calcination Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 239000004570 mortar (masonry) Substances 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 240000007594 Oryza sativa Species 0.000 claims description 2
- 235000007164 Oryza sativa Nutrition 0.000 claims description 2
- 238000005119 centrifugation Methods 0.000 claims description 2
- 239000010903 husk Substances 0.000 claims description 2
- 238000010335 hydrothermal treatment Methods 0.000 claims description 2
- 235000009566 rice Nutrition 0.000 claims description 2
- 244000082204 Phyllostachys viridis Species 0.000 claims 1
- 238000001179 sorption measurement Methods 0.000 abstract description 15
- 230000001699 photocatalysis Effects 0.000 abstract description 8
- 239000003344 environmental pollutant Substances 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 4
- 231100000719 pollutant Toxicity 0.000 abstract description 4
- 239000003463 adsorbent Substances 0.000 abstract description 3
- 150000001875 compounds Chemical class 0.000 abstract description 2
- 238000006555 catalytic reaction Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 7
- 238000006731 degradation reaction Methods 0.000 description 6
- 230000015556 catabolic process Effects 0.000 description 5
- 239000011259 mixed solution Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 4
- 230000002195 synergetic effect Effects 0.000 description 4
- 238000005303 weighing Methods 0.000 description 3
- 241001330002 Bambuseae Species 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- RXPAJWPEYBDXOG-UHFFFAOYSA-N hydron;methyl 4-methoxypyridine-2-carboxylate;chloride Chemical compound Cl.COC(=O)C1=CC(OC)=CC=N1 RXPAJWPEYBDXOG-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000013033 photocatalytic degradation reaction Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000007146 photocatalysis Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/06—Halogens; Compounds thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/18—Carbon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/28—Regeneration or reactivation
- B01J27/32—Regeneration or reactivation of catalysts comprising compounds of halogens
-
- B01J35/39—
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/0009—Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst
- B01J37/0027—Powdering
- B01J37/0036—Grinding
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/10—Photocatalysts
Abstract
The invention discloses a preparation method and application of a bismuth oxybromide/Biochar composite photocatalyst, and aims to solve the problems that an existing Biochar (Biochar) adsorbent cannot be reused and is small in adsorption capacity. According to the photocatalytic material, the Biochar with good adsorption performance and the BiOBr are subjected to ball milling and mixing, so that the adsorption capacity of the Biochar to organic pollutants is improved, and meanwhile, the capacity of synergistically adsorbing and degrading the organic pollutants under visible light of the bismuth oxybromide/Biochar compound is further enhanced compared with the Biochar, so that the photocatalytic material can be used for degrading pollutants under visible light catalysis in the field of energy, and the Biochar has the capacity of being repeatedly used.
Description
Technical Field
The invention relates to the technical field of photocatalysis, in particular to a preparation method and application of a bismuth oxybromide/biochar composite visible-light-driven photocatalyst.
Background
In recent years, energy shortage and environmental pollution are two major threats threatening the long-term stable development of the human society, and the research and development of new green and sustainable development materials are hot topics of research. Biochar is a porous carbon-based material, and is widely applied to adsorption and treatment of pollutants in the environment as an adsorbent. However, as an adsorbent, it has no photocatalytic activity, and thus adsorption of organic pollutants can be performed only once. Bismuth oxybromide (BiOBr) has visible light activity, can absorb part of visible light, has good chemical stability, is simple in preparation process, and has good application prospect in the field of photocatalytic degradation of pollutants as a photocatalyst. This patent will have the bioBr of visible light activity and go forward compound with biological charcoal, further increased the specific surface area and the photocatalytic power of biological charcoal, solved biological charcoal specific surface area lower and be difficult to used repeatedly's problem.
Disclosure of Invention
The invention aims to solve the problems that: the preparation method of the bismuth oxybromide/biochar composite visible-light-driven photocatalyst can solve the problems that the existing biochar adsorption material is small in specific surface area, free of photocatalytic activity and incapable of being used repeatedly.
The technical scheme provided by the invention for solving the problems is as follows: a preparation method of a bismuth oxybromide/biochar composite visible-light-driven photocatalyst comprises the following steps:
step S1, preparation of charcoal powder: putting the charcoal raw material into a mortar for full grinding to obtain charcoal powder;
step S2, preparation of bismuth oxybromide powder: putting 1-6 parts by weight of pentahydrate bismuth nitrate and 37-150 parts by weight of deionized water into a beaker, stirring at the temperature of 20-30 ℃, adding 1-5 parts by weight of hexadecyl trimethyl ammonium bromide, stirring at the temperature of 20-30 ℃, putting into a reaction kettle, putting into an oven for hydrothermal treatment, taking out for centrifugation, sequentially washing with deionized water and absolute ethyl alcohol, drying, calcining the dried solid, cooling, and fully grinding to obtain bismuth oxybromide powder;
step S3, preparing the bismuth oxybromide/biochar composite visible light catalyst: and (4) simultaneously putting the charcoal powder in the step S1 and the bismuth oxybromide powder in the step S2 into a high-speed ball mill for ball milling, and cooling the ball-milled powder to obtain the bismuth oxybromide/charcoal composite visible-light-driven photocatalyst.
Preferably, the biochar raw material in the step S1 is one of bamboo charcoal and rice husk charcoal.
Preferably, the mass ratio of the bismuth nitrate pentahydrate to the cetyltrimethylammonium bromide in the step S2 is 4: 3.
Preferably, in the step S2, the stirring time of the bismuth nitrate pentahydrate and the deionized water is 10 to 20 min, and the stirring time of the cetyl trimethyl ammonium bromide and the bismuth nitrate pentahydrate solution is 20 to 40 min.
Preferably, the hydrothermal time in the step S2 is 16-20 hours, and the hydrothermal temperature is 150-180 ℃.
Preferably, the mass ratio of the bismuth oxybromide powder to the charcoal powder in the step S3 is 3:7 to 9: 1.
Preferably, the ball milling time in the step S3 is 10-14 h.
The invention also provides another technical scheme, and the application of the bismuth oxybromide/biochar composite visible-light-driven photocatalyst prepared by the method is characterized in that: the bismuth oxybromide/biochar composite visible-light-driven photocatalyst is applied to the reaction of synergistically adsorbing and degrading organic pollutants under ultraviolet visible light.
Further, the solution after the reaction for degrading the organic pollutants is filled into a centrifugal tube, and the bismuth oxybromide/biochar composite visible-light-driven photocatalyst is recovered in a centrifugal mode.
Compared with the prior art, the invention has the advantages that:
(1) the ball milling process increases the specific surface area of the photocatalyst, and the biochar enhances the adsorption capacity of the photocatalyst, so that the bismuth oxybromide/biochar composite photocatalyst has better adsorption capacity compared with pure bismuth oxybromide and pure biochar.
(2) Compared with pure biochar, the bismuth oxybromide/biochar composite photocatalyst has excellent activity of photocatalytic degradation of pollutants.
(3) The adsorption capacity of the bismuth oxybromide/biochar composite visible-light-driven photocatalyst and the activity of catalyzing, synergistically adsorbing and degrading organic pollutants under ultraviolet visible light can be adjusted through the content of the loaded biochar.
(4) After degradation is finished, the biochar can be recycled in a centrifugal mode and subjected to secondary synergistic adsorption degradation.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is an activity diagram of organic pollutants simulated by synergistic adsorption and degradation under ultraviolet and visible light of samples prepared in examples 1-2;
FIG. 2 is a graph showing the adsorption performance of the samples prepared in examples 1-2.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings and examples, so that how to implement the technical means for solving the technical problems and achieving the technical effects of the present invention can be fully understood and implemented.
Example 1:
step one, preparing charcoal powder: weighing 20 g of bamboo charcoal, putting into a mortar, fully grinding to obtain charcoal powder, and recording the charcoal powder as Biochar;
step two, preparing bismuth oxybromide powder: weighing 6 g of pentahydrate bismuth nitrate, adding 150 ml of deionized water, and stirring at the temperature of 20-30 ℃ for 15 min to obtain a bismuth nitrate aqueous solution. 4.508 g of hexadecyl trimethyl ammonium bromide is weighed and added into a bismuth nitrate solution, and the mixture is stirred for 30 min at the temperature of 20-30 ℃. Putting the mixed solution into a reaction kettle, putting the reaction kettle into an oven at 160 ℃ for hydrothermal for 18 h, taking out the mixed solution, centrifuging the mixed solution, sequentially washing the mixed solution with deionized water and absolute ethyl alcohol for three times, drying the washed mixed solution, calcining the dried solid, cooling the calcined solid, and fully grinding the solid to obtain bismuth oxybromide powder which is recorded as BiOBr;
step three, preparing the bismuth oxybromide/biochar composite visible light catalyst: weighing 1.4 g of the charcoal powder obtained in the first step and 0.6 g of the bismuth oxybromide powder obtained in the second step, simultaneously putting the charcoal powder and the bismuth oxybromide powder into a high-speed vibration ball mill for ball milling for 12 hours, and cooling the ball-milled powder to obtain the bismuth oxybromide/charcoal composite visible light catalyst which is recorded as 30% BiOBr/Biochar.
Step four, the recovery of the biochar: and (3) carrying out photocatalytic synergistic adsorption degradation on the catalyst obtained in the step three, loading the solution after degradation reaction into a centrifugal tube, and centrifuging at the rotating speed of 6000 r/min for 3 min to obtain the bismuth oxybromide/charcoal composite visible-light-driven photocatalyst.
Example 2: the difference from the embodiment 1 is that: in the first step, 0.6 g of charcoal powder was weighed, and in the second step, 1.4 g of bismuth oxybromide powder was weighed, and the obtained bismuth oxybromide/charcoal composite visible-light-induced photocatalyst was designated as 70% BiOBr/Biochar.
Further, the marked samples of the above examples 1-2 were evaluated for photocatalytic synergistic adsorption degradation activity, and the test results are shown in fig. 1.
Furthermore, the adsorption capacity of the labeled samples of examples 1-2 was evaluated, and the test results are shown in fig. 2.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention. The foregoing is merely illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the claims. The present invention is not limited to the above embodiments, and the specific structure thereof is allowed to vary. All changes which come within the scope of the invention as defined by the independent claims are intended to be embraced therein.
Claims (9)
1. A preparation method of a bismuth oxybromide/biochar composite visible-light-driven photocatalyst is characterized by comprising the following steps:
step S1, preparation of charcoal powder: putting the charcoal raw material into a mortar for full grinding to obtain charcoal powder;
step S2, preparation of bismuth oxybromide powder: putting 1-6 parts by weight of pentahydrate bismuth nitrate and 37-150 parts by weight of deionized water into a beaker, stirring at the temperature of 20-30 ℃, adding 1-5 parts by weight of hexadecyl trimethyl ammonium bromide, stirring at the temperature of 20-30 ℃, putting into a reaction kettle, putting into an oven for hydrothermal treatment, taking out for centrifugation, sequentially washing with deionized water and absolute ethyl alcohol, drying, calcining the dried solid, cooling, and fully grinding to obtain bismuth oxybromide powder;
step S3, preparing the bismuth oxybromide/biochar composite visible light catalyst: and (4) simultaneously putting the charcoal powder in the step S1 and the bismuth oxybromide powder in the step S2 into a high-speed ball mill for ball milling, and cooling the ball-milled powder to obtain the bismuth oxybromide/charcoal composite visible-light-driven photocatalyst.
2. The preparation method of the bismuth oxybromide/biochar composite visible-light-driven photocatalyst as claimed in claim 1, wherein the preparation method comprises the following steps: in the step S1, the biochar raw material is one of bamboo charcoal and rice husk charcoal.
3. The preparation method of the bismuth oxybromide/biochar composite visible-light-driven photocatalyst as claimed in claim 1, wherein the preparation method comprises the following steps: in the step S2, the mixing and stirring time of the bismuth nitrate pentahydrate and the deionized water is 10-20 min, and the mixing and stirring time of the cetyl trimethyl ammonium bromide and the bismuth nitrate pentahydrate solution is 20-40 min.
4. The preparation method of the bismuth oxybromide/biochar composite visible-light-driven photocatalyst as claimed in claim 1, wherein the preparation method comprises the following steps: the mass ratio of the bismuth nitrate pentahydrate to the cetyltrimethylammonium bromide in the step S2 is 4: 3.
5. The preparation method of the bismuth oxybromide/biochar composite visible-light-driven photocatalyst as claimed in claim 1, wherein the preparation method comprises the following steps: the hydrothermal time in the step S2 is 16-20 hours, and the hydrothermal temperature is 150-180 ℃.
6. The preparation method of the bismuth oxybromide/biochar composite visible-light-driven photocatalyst as claimed in claim 1, wherein the preparation method comprises the following steps: in the step S3, the mass ratio of the bismuth oxybromide powder to the charcoal powder is 3: 7-9: 1.
7. The preparation method of the bismuth oxybromide/biochar composite visible-light-driven photocatalyst as claimed in claim 1, wherein the preparation method comprises the following steps: and in the step S3, the ball milling time is 10-14 h.
8. The use of the bismuth oxybromide/biochar composite visible-light-driven photocatalyst prepared by the preparation method according to any one of claims 1 to 7, which is characterized in that: the bismuth oxybromide/biochar composite visible-light-driven photocatalyst is applied to the reaction of synergistically adsorbing and degrading organic pollutants under ultraviolet visible light.
9. The application of the bismuth oxybromide/biochar composite visible-light-driven photocatalyst as claimed in claim 8, wherein: and (3) putting the solution after the reaction of degrading the organic pollutants into a centrifugal tube, and recovering the bismuth oxybromide/biochar composite visible-light-driven photocatalyst in a centrifugal mode.
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Cited By (6)
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| CN113289647A (en) * | 2021-05-12 | 2021-08-24 | 南京师范大学 | Biochar-doped BiOBrxCl1-xPhotocatalyst, preparation method and application |
| CN113441132A (en) * | 2021-06-10 | 2021-09-28 | 南昌航空大学 | Preparation method of high-activity bismuth molybdate/biochar composite photocatalyst based on strong interface interaction |
| CN114733534A (en) * | 2022-05-07 | 2022-07-12 | 中国林业科学研究院林产化学工业研究所 | Bismuth oxybromide-lignin composite photocatalyst and preparation method and application thereof |
| CN114832842A (en) * | 2022-05-07 | 2022-08-02 | 中国林业科学研究院林产化学工业研究所 | Bismuth oxybromide-lignin-based activated carbon composite photocatalyst and preparation method and application thereof |
| CN115337941A (en) * | 2022-08-09 | 2022-11-15 | 河南科技大学 | Photocatalytic fresh-keeping material and preparation method and application thereof |
| CN116371393A (en) * | 2023-04-19 | 2023-07-04 | 重庆华谱信息技术有限公司 | Method for efficiently sterilizing and degrading organic pollutants |
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| CN113289647B (en) * | 2021-05-12 | 2023-09-22 | 南京师范大学 | Biochar doped BiOBr x Cl 1-x Photocatalyst, preparation method and application |
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