CN112774706A - Bismuth oxycarbonate/sepiolite composite photocatalyst and preparation method thereof - Google Patents
Bismuth oxycarbonate/sepiolite composite photocatalyst and preparation method thereof Download PDFInfo
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- CN112774706A CN112774706A CN202110132659.2A CN202110132659A CN112774706A CN 112774706 A CN112774706 A CN 112774706A CN 202110132659 A CN202110132659 A CN 202110132659A CN 112774706 A CN112774706 A CN 112774706A
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- 239000004113 Sepiolite Substances 0.000 title claims abstract description 109
- 229910052624 sepiolite Inorganic materials 0.000 title claims abstract description 102
- 235000019355 sepiolite Nutrition 0.000 title claims abstract description 100
- 239000011941 photocatalyst Substances 0.000 title claims abstract description 56
- 239000002131 composite material Substances 0.000 title claims abstract description 46
- 229910000014 Bismuth subcarbonate Inorganic materials 0.000 title claims abstract description 40
- FWIZHMQARNODNX-UHFFFAOYSA-L dibismuth;oxygen(2-);carbonate Chemical compound [O-2].[O-2].[Bi+3].[Bi+3].[O-]C([O-])=O FWIZHMQARNODNX-UHFFFAOYSA-L 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
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- 239000000243 solution Substances 0.000 claims abstract description 44
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical compound [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 claims abstract description 22
- 239000011259 mixed solution Substances 0.000 claims abstract description 19
- VCJMYUPGQJHHFU-UHFFFAOYSA-N iron(III) nitrate Inorganic materials [Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VCJMYUPGQJHHFU-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052797 bismuth Inorganic materials 0.000 claims abstract description 15
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- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 239000008367 deionised water Substances 0.000 claims description 17
- 229910021641 deionized water Inorganic materials 0.000 claims description 17
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- 238000000034 method Methods 0.000 claims description 14
- 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 11
- SZQUEWJRBJDHSM-UHFFFAOYSA-N iron(3+);trinitrate;nonahydrate Chemical compound O.O.O.O.O.O.O.O.O.[Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O SZQUEWJRBJDHSM-UHFFFAOYSA-N 0.000 claims description 10
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- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 8
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- 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 claims description 4
- RLGQACBPNDBWTB-UHFFFAOYSA-N cetyltrimethylammonium ion Chemical compound CCCCCCCCCCCCCCCC[N+](C)(C)C RLGQACBPNDBWTB-UHFFFAOYSA-N 0.000 claims description 3
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- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 abstract description 3
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- 238000006731 degradation reaction Methods 0.000 description 18
- 230000015556 catabolic process Effects 0.000 description 15
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 10
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- 230000001699 photocatalysis Effects 0.000 description 9
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- RBTBFTRPCNLSDE-UHFFFAOYSA-N 3,7-bis(dimethylamino)phenothiazin-5-ium Chemical compound C1=CC(N(C)C)=CC2=[S+]C3=CC(N(C)C)=CC=C3N=C21 RBTBFTRPCNLSDE-UHFFFAOYSA-N 0.000 description 2
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/39—Photocatalytic properties
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- 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
- B01J27/20—Carbon compounds
- B01J27/232—Carbonates
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- 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
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2101/40—Organic compounds containing sulfur
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Abstract
本发明涉及一种碳酸氧铋/海泡石复合光催化剂及其制备方法。本发明先将十六烷基三甲基溴化铵(CTAB)溶于乙二醇(EG)配制CTAB‑EG溶液为模板剂和还原剂，再加入硝酸铋‑硝酸铁溶液，用强碱溶液调节混合液pH值，然后再将纯化海泡石加入，充分混合后转入聚四氟乙烯高压釜中进行水热反应生成形貌可控的多孔碳酸氧铋/海泡石复合光催化剂。通过在水热条件氧化分解EG或CTAB产生碳酸根，并在CTAB的表面活性和模板作用以及海泡石的界面效应综合作用下在海泡石上负载并生长碳酸氧铋，可有效控制其结构和形貌，降低能带隙和光生载流子的复合率，提高可见光吸收利用率和对有机物的吸附性能，从而提高其光催化降解性能和矿化能力。
The invention relates to a bismuth oxycarbonate/sepiolite composite photocatalyst and a preparation method thereof. In the present invention, firstly, cetyltrimethylammonium bromide (CTAB) is dissolved in ethylene glycol (EG) to prepare a CTAB-EG solution as a template agent and a reducing agent, then a bismuth nitrate-ferric nitrate solution is added, and a strong alkaline solution is used. The pH value of the mixed solution is adjusted, then purified sepiolite is added, and after thorough mixing, it is transferred to a polytetrafluoroethylene autoclave for hydrothermal reaction to generate a porous bismuth oxycarbonate/sepiolite composite photocatalyst with controllable morphology. By oxidatively decomposing EG or CTAB under hydrothermal conditions to generate carbonate, and under the combined action of CTAB's surface activity and templating effect and sepiolite's interfacial effect, bismuth oxycarbonate is supported and grown on sepiolite, which can effectively control its structure and structure. morphology, reduce the energy band gap and the recombination rate of photogenerated carriers, improve the utilization rate of visible light absorption and the adsorption performance of organic matter, thereby improving its photocatalytic degradation performance and mineralization ability.
Description
Technical Field
The invention belongs to the technical field of photocatalytic degradation of organic pollutants, and particularly relates to a bismuth oxycarbonate/sepiolite composite photocatalyst and a preparation method thereof.
Background
Due to the rapid development of industrial and agricultural production and the continuous improvement of the living standard of people, organic pollutants discharged to the environment are increased day by day, and the water environment pollution is serious day by day. Heretofore, various treatment techniques have been developed to cope with the increasing organic contamination such as adsorption, flocculation, electrochemical methods, chemical reagent oxidation, ozone oxidation, Fenton oxidation, photo-Fenton oxidation, photocatalytic degradation and the like. In a plurality of treatment methods, the photocatalytic degradation can utilize light energy to oxidize and decompose organic pollutants at normal temperature, has strong capability of degrading the organic pollutants, complete degradation, high speed and no secondary pollution, can fully utilize natural light sources particularly in visible light catalytic degradation, and has low treatment cost. The semiconductor mesoporous structure photocatalytic material is beneficial to light reflection and refraction due to the excellent porous structure and the larger specific surface area, and can greatly improve the utilization rate of light; and the large specific surface area can provide enough active sites and places for pollutant molecule adsorption, and promote the high-efficiency mass transfer of pollutants, thereby improving the catalytic degradation effect of pollutants, and becoming a key point and a hotspot for research and development of environmental protection workers. At present, titanium dioxide is the most deeply researched, developed and widely applied photocatalyst, and has the advantages of good chemical stability, strong chemical pollutant resistance, environmental friendliness and the like. But because the energy band gap is higher than 3.2eV, the titanium dioxide powder can be effectively excited to generate electron/hole pairs only under the irradiation of ultraviolet rays (lambda is less than or equal to 387.5nm), and the titanium dioxide powder has the defects of high recombination rate of the electron/hole pairs, difficult separation of the titanium dioxide powder suspended in the solution and the like, thereby greatly limiting the popularization and the application of the titanium dioxide powder. Therefore, the research and development of the photocatalyst which has high light utilization rate, particularly the utilization of visible light, good catalytic degradation effect, low price and no toxicity per se is the key for promoting the application of the photocatalytic degradation technology in the treatment of organic pollutants.
In recent years, bismuth-based semiconductor materials, such as BiFeO3、BiVO4、Bi2WO6、Bi2MoO6And BiOX and the like, because the internal electric field generated by polarization is beneficial to the separation of photo-generated electrons and holes, the bismuth-based compound has higher photocatalytic performance, and because the bismuth-based compound is non-toxic and causes little pollution to the environment, the bismuth-based compound has become the key point of research and development of environmental protection workers. Wherein, bismuth oxycarbonate (Bi)2O2CO3) Is a typical Aurivillius-type oxide, belongs to a tetragonal system, and has unique composition of [ Bi2O2]2+And CO3 2-The inner electric field generated by polarization is beneficial to the separation of photoinduced electrons and holes, thereby improving Bi2O2CO3The photocatalytic performance of (a). However, the band gap value is between 3.2 and 3.5eV, the visible light absorption rate is low, the recombination rate of the photon-generated carrier particles (hole/electron pairs) is high, the quantum efficiency is low, and the popularization and the application of the photon-generated carrier particles are greatly limited. Therefore, appropriate measures must be taken to improve the structure and morphology of the material, reduce the energy band gap thereof, and improve the light absorption rate and light quantum efficiency and the adsorption performance to pollutants, thereby improving the photocatalytic degradation performance to pollutants.
Sepiolite (Sepiolite) is a magnesium-containing porous inosilicate mineral, has a unique nano-structure pore diameter, a large pore volume and a large specific surface area, is strong in adsorption capacity, light in weight and good in chemical stability, and particularly contains a large number of acid-base centers, so that other materials can be formed and grown on the Sepiolite by taking the Sepiolite as a support, and the purpose of regulating and controlling the structure and the morphology of the generated materials is achieved. Therefore, in-situ generation of the photocatalyst Bi in the presence of sepiolite is adopted2O2CO3Thereby preparing bismuth oxycarbonate/sepiolite (Bi)2O2CO3Sepiolite) composite photocatalyst, expected to improve the generated Bi2O2CO3The structure and the shape of the photocatalyst reduce the energy gap band, improve the absorption rate of visible light and the adsorption performance of pollution, and achieve the aim of improving the photocatalytic activityIn (1). So far, Bi has not been existed yet2O2CO3Research and report of a/Sepiolite composite photocatalyst.
Disclosure of Invention
In view of Bi2O2CO3Has the advantages of layered structure, no toxicity and the like, has the defects of high energy band gap, low light absorption rate, high recombination rate of photon-generated carriers, low photocatalytic efficiency and the like, and aims to provide Bi2O2CO3The Sepiolite composite photocatalyst has excellent structural morphology, lower energy gap band and photogenerated carrier recombination rate, higher visible light absorption utilization rate and quantum efficiency, and also has good adsorption performance on organic matters and excellent photocatalytic degradation performance.
Another object of the present invention is to provide a Bi2O2CO3Preparation method of/Sepiolite composite photocatalyst, and in-situ generation of Bi in the presence of Sepiolite2O2CO3To Bi2O2CO3The structure and the appearance of the product are effectively controlled, the preparation method is simple and convenient, the process is easy to control, the discharge of three wastes is less, the manufacturing cost is lower, and the large-scale production is easy to realize; the method specifically comprises the following steps:
(1) adding cetyl trimethyl ammonium bromide into ethylene glycol, and ultrasonically stirring for 20-40 min to prepare a cetyl trimethyl ammonium bromide-ethylene glycol solution with the concentration of 0.125-0.25 mol/L, and marking as a solution A;
(2) adding bismuth nitrate pentahydrate and ferric nitrate nonahydrate into deionized water according to the molar ratio of 1: 0.9-1.0, ultrasonically stirring for 20-40 min to dissolve and prepare a bismuth nitrate-ferric nitrate mixed solution, marking as a solution B, wherein Bi is3+The concentration of the Fe is 0.02-0.033 mol/L3+The concentration is 0.018-0.033 mol/L;
(3) slowly dropwise adding the solution B prepared in the step (2) into the solution A prepared in the step (1), ultrasonically stirring for 15-30 min, then adjusting the pH value to 10-10.5, and continuously ultrasonically stirring for 3-4 h at room temperature to obtain a mixture C;
(4) adding the purified sepiolite into the mixture C obtained in the step (3) according to the mass ratio of 0.082-0.41: 1 of the sepiolite to the bismuth nitrate pentahydrate, and carrying out ultrasonic stirring for 40-80 min to obtain a mixture D;
(5) transferring the mixture D prepared in the step (4) into a high-pressure reaction kettle, and reacting for 3-6 h at 180-250 ℃; cooling to room temperature, filtering, washing filter residues with deionized water and ethanol for 2-5 times respectively, and drying at 100-120 ℃ to constant weight to obtain Bi2O2CO3A Sepiolite composite photocatalyst.
Further, in the step (3), a strong alkali solution of 8-12 mol/L is adopted for adjusting the pH, and the used strong alkali is KOH or NaOH.
Further, in the step (4), the purified sepiolite is processed by the following method: grinding sepiolite, sieving with a 200-300-mesh sieve, soaking in 1-2 mol/L hydrochloric acid at 75-85 ℃ for refluxing for 0.5-1 h, filtering, and washing with distilled water to be neutral; then preparing a mixture of sepiolite and 10mmol/L Cetyl Trimethyl Ammonium Bromide (CTAB) solution with the solid-to-liquid ratio (g/mL) of 1: 40-60, carrying out ultrasonic treatment for 0.5-1 h, filtering, washing with distilled water, drying at 80-100 ℃ to constant weight, grinding and sieving with a 800-1000-mesh sieve, and taking undersize for later use.
Further, in the step (5), the high-pressure reaction kettle is a polytetrafluoroethylene-lined high-pressure reaction kettle.
Furthermore, the ultrasonic stirring is ultrasonic-assisted mechanical stirring, and the ultrasonic power is 200-250W.
Furthermore, the reagents used, cetyl trimethyl ammonium bromide, ethylene glycol, bismuth nitrate pentahydrate, ferric nitrate nonahydrate, KOH, NaOH, ethanol and hydrochloric acid, were all analytically pure.
The invention relates to a bismuth oxycarbonate/sepiolite composite photocatalyst and a preparation method thereof. Dissolving cetyl trimethyl ammonium bromide in ethylene glycol to prepare a template-reducing agent solution, dissolving bismuth nitrate and ferric nitrate in deionized water simultaneously to prepare a bismuth nitrate-ferric nitrate mixed solution, dropwise adding the bismuth nitrate-ferric nitrate mixed solution into the template-reducing agent solution, adjusting the pH value of the mixed solution by using a strong base solution, and fully stirring to obtain a mixture; adding the processed purified sepiolite into the mixture, mixing thoroughly, and transferringAnd carrying out hydrothermal reaction in an autoclave with a polytetrafluoroethylene lining to generate the porous bismuth oxycarbonate/sepiolite composite photocatalyst which is supported by sepiolite and has good appearance. The ethylene glycol or hexadecyl trimethyl ammonium bromide is oxidatively decomposed by bismuth nitrate and ferric nitrate under hydrothermal conditions to generate carbonate radical, and the carbonate radical is reacted with Bi3+Bismuth oxycarbonate is generated under the alkaline condition, and the bismuth oxycarbonate is loaded and grows on the sepiolite under the comprehensive action of the surface activity and the template action of hexadecyl trimethyl ammonium bromide and the strong interface effect of the sepiolite. The shape and the structure of the generated bismuth subcarbonate are well controlled, the energy band gap and the recombination rate of photon-generated carriers are reduced, the visible light absorption utilization rate and the adsorption performance to organic matters are improved, and the photocatalytic degradation performance to organic pollution is obviously improved.
Compared with the prior art, the invention has the following beneficial technical effects:
(1) cetyl trimethyl ammonium bromide-ethylene glycol solution is used as a template agent and a reducing agent, carbonate is obtained by oxidizing and decomposing cetyl trimethyl ammonium bromide or ethylene glycol through bismuth nitrate and ferric nitrate under hydrothermal conditions, the amount of carbonate in the reaction process can be effectively controlled, and accordingly Bi is controlled2O2CO3The formation speed of (c); the structure and the shape of the composite photocatalyst are effectively controlled by the surface activity or the template action of cetyl trimethyl ammonium bromide and ethylene glycol and the interface action of sepiolite.
(2) Bi prepared by the invention2O2CO3the/Sepiolite composite photocatalyst is a porous structure, and the specific surface area of the composite photocatalyst is not Bi generated by Sepiolite2O2CO3Large; the adsorption capacity to organic matters is enhanced through the synergistic effect with the sepiolite.
(3) Bi prepared by the invention2O2CO3Bi in Sepiolite composite photocatalyst2O2CO3The sepiolite is generated in the presence of sepiolite and grows by taking the sepiolite as a support, and the sepiolite have good fusion and stability; the sepiolite not only promotes and regulates Bi loaded on the sepiolite by using a special pore channel structure2O2CO3Formation of structure and morphology ofReducing the energy band gap and the recombination rate of photo-generated electrons and holes, and sepiolite and Bi2O2CO3The synergistic effect enhances the adsorption and absorption utilization rate of the organic pollutants on light and improves the photocatalytic degradation performance of the organic pollutants.
(4) The product of the invention has excellent visible light catalytic degradation performance and good mineralization capability on organic pollutants, and has good photocatalytic decoloration performance on organic dye wastewater; safe and nontoxic, convenient to recover and good in recycling performance, and is suitable for treating various organic polluted wastewater.
(5) The method has the advantages of simple preparation process, easy control of the process, less discharge of three wastes, lower manufacturing cost, conventional equipment as required, easy realization of large-scale production and wide application prospect.
Drawings
Fig. 1 is a synthesis route diagram of a bismuth oxycarbonate/sepiolite composite photocatalyst.
FIG. 2 shows a bismuth oxycarbonate/sepiolite composite photocatalyst (m (Bi)2O2CO3) XRD pattern of m (sepiolite) 1: 0.4).
FIG. 3 shows a bismuth oxycarbonate/sepiolite composite photocatalyst (m (Bi)2O2CO3) SEM image of m (Sepilolite) 1: 0.4).
FIG. 4 shows a bismuth oxycarbonate/sepiolite composite photocatalyst (m (Bi)2O2CO3) Graph of photocatalytic degradation efficiency for m (Sepilolate) 1: 0.4).
FIG. 5 shows a bismuth oxycarbonate/sepiolite composite photocatalyst (m (Bi)2O2CO3) M (Sepilolate) 1: 0.4).
Note: m (Bi)2O2CO3) M (Sepilolite) is the mass ratio of bismuth subcarbonate to sepiolite.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and specific examples, but the present invention is not limited thereto.
Example 1
(1) Adding 5.47g of hexadecyl trimethyl ammonium bromide into 120mL of glycol, and ultrasonically stirring for 20min to prepare a hexadecyl trimethyl ammonium bromide-glycol solution A with the concentration of 0.125 mol/L;
(2) respectively adding 2.94g of 99.0 percent bismuth nitrate pentahydrate and 2.46g of 98.5 percent ferric nitrate nonahydrate into 300mL of deionized water, and ultrasonically stirring for 20min to dissolve into Bi3+The concentration is 0.02mol/L, Fe3+A bismuth nitrate-ferric nitrate mixed solution B with the concentration of 0.020 mol/L;
(3) slowly dropwise adding the mixed solution B prepared in the step (2) into the solution A prepared in the step (1), ultrasonically stirring for 15min, then adjusting the pH to 10.5 by using 10mol/L KOH solution, and continuously ultrasonically stirring for 4h at room temperature to obtain a mixture C;
(4) adding 0.24g of purified sepiolite into the mixture C obtained in the step (3), and ultrasonically stirring for 40min to obtain a mixture D;
(5) transferring the mixture D prepared in the step (4) into a high-pressure reaction kettle, and reacting for 3 hours at 250 ℃; and cooling to room temperature, filtering, washing filter residues for 3 times respectively by using deionized water and ethanol, and drying at 120 ℃ to constant weight to obtain 1.75g of bismuth oxycarbonate/sepiolite composite photocatalyst.
Example 2
(1) Adding 5.47g of hexadecyl trimethyl ammonium bromide into 100mL of ethylene glycol, and ultrasonically stirring for 25min to prepare a hexadecyl trimethyl ammonium bromide-ethylene glycol solution A with the concentration of 0.15 mol/L;
(2) respectively adding 2.94g of 99.0 percent bismuth nitrate pentahydrate and 2.41g of 98.5 percent ferric nitrate nonahydrate into 240mL of deionized water, and ultrasonically stirring for 25min to dissolve into Bi3+The concentration is 0.025mol/L, Fe3+A bismuth nitrate-ferric nitrate mixed solution B with the concentration of 0.024 mol/L;
(3) slowly dropwise adding the mixed solution B prepared in the step (2) into the solution A prepared in the step (1), ultrasonically stirring for 20min, then adjusting the pH to 10.3 by using a KOH solution of 12mol/L, and continuously ultrasonically stirring for 3.5h at room temperature to obtain a mixture C;
(4) adding 0.29g of purified sepiolite into the mixture C obtained in the step (3), and ultrasonically stirring for 50min to obtain a mixture D;
(5) transferring the mixture D prepared in the step (4) into a high-pressure reaction kettle, and reacting for 4 hours at 230 ℃; and cooling to room temperature, filtering, washing filter residues with deionized water and ethanol for 4 times respectively, and drying at 115 ℃ to constant weight to obtain 1.78g of the bismuth oxycarbonate/sepiolite composite photocatalyst.
Example 3
(1) Adding 5.47g of hexadecyl trimethyl ammonium bromide into 75mL of glycol, and ultrasonically stirring for 30min to prepare a hexadecyl trimethyl ammonium bromide-glycol solution A with the concentration of 0.20 mol/L;
(2) respectively adding 2.94g of 99.0 percent bismuth nitrate pentahydrate and 2.34g of 98.5 percent ferric nitrate nonahydrate into 200mL of deionized water, and ultrasonically stirring for 25min to dissolve into Bi3+The concentration is 0.030mol/L, Fe3+A bismuth nitrate-ferric nitrate mixed solution B with the concentration of 0.0285 mol/L;
(3) slowly dropwise adding the mixed solution B prepared in the step (2) into the solution A prepared in the step (1), ultrasonically stirring for 25min, then adjusting the pH to 10.1 by using 11mol/L KOH solution, and continuously ultrasonically stirring for 3h at room temperature to obtain a mixture C;
(4) adding 0.59g of purified sepiolite into the mixture C obtained in the step (3), and ultrasonically stirring for 60min to obtain a mixture D;
(5) transferring the mixture D prepared in the step (4) into a high-pressure reaction kettle, and reacting for 4.5 hours at 220 ℃; and cooling to room temperature, filtering, washing filter residues with deionized water and ethanol for 3 times respectively, and drying at 110 ℃ to constant weight to obtain 2.04g of the bismuthyl carbonate/sepiolite composite photocatalyst.
The phase was determined on a D8 Advance X-powder diffractometer (40kV,40mA, Bruker AXS, Germany) and scanned at 10 ℃ to 80 ℃ using the MDI Jade 5.0 analyte phase, the results of which are shown in FIG. 2. As can be seen from FIG. 2, Bi2O2CO3The diffraction pattern of the/Sepiolite XRD is between 23.9 degrees, 30.3 degrees, 32.7 degrees and 48.9 degrees and Bi2O2CO3The standard card (JCPDS No.41-1488) is well matched, and the 26.6-degree diffraction peak and the sepiolite (080) crystal face structure indicate that the product is Bi2O2CO3Sepiolite composite。
Bi prepared in the absence of sepiolite was determined using a field emission scanning electron microscope (FESEM, Hitachi Co., Japan) model S-48002O2CO3And the morphology of the sample of this example, the results are shown in FIG. 3. As can be seen from FIG. 3(a), Bi formed in the absence of sepiolite2O2CO3Is composed of long granular particles with different sizes; as can be seen from FIG. 3(b), Bi formed in the presence of sepiolite2O2CO3the/Sepiolite composite photocatalyst is porous large particles formed by stacking fine spherical particles. This indicates that the presence of sepiolite alters the coating layer Bi2O2CO3The crystal structure of the photocatalyst is beneficial to improving the photoelectrochemical properties of the photocatalyst, such as improving the absorption performance of light, reducing the energy band gap, the recombination rate of photo-generated electrons and holes and the like, and improving the adsorption capacity of pollutants.
Bi determination with a specific surface area-pore volume analyzer (BELSORP-mini II, MicrotracBEL, Japan)2O2CO3Has a specific surface area of 49.01m2/g，Bi2O2CO3Specific surface area of/Sepiolite composite photocatalyst is 77.86m2(ii) in terms of/g. Measuring diffuse reflection ultraviolet-visible spectrum (UV-vis DRS) by using UV-2550 scanning ultraviolet-visible spectrophotometer (Shimadzu, Japan), and calculating to obtain Bi2O2CO3And Bi2O2CO3Energy band gap E of/Sepiolite sampleg3.39eV and 3.14eV, respectively, indicating that Bi2O2CO3Bi formed by compounding with sepiolite2O2CO3E of/Sepiolite composite photocatalystgObviously reduces the content of the sepiolite, obviously improves the structure of the composite photocatalyst and reduces the energy band gap of the composite photocatalyst.
Example 4
(1) Adding 5.47g of hexadecyl trimethyl ammonium bromide into 60mL of ethylene glycol, and ultrasonically stirring for 40min to prepare a hexadecyl trimethyl ammonium bromide-ethylene glycol solution A with the concentration of 0.25 mol/L;
(2) respectively taking 2.94g of 99.0 percent pentahydrate bismuth nitrate and 2.21 g ofAdding 98.5% g ferric nitrate nonahydrate into 182mL deionized water, and ultrasonically stirring for 25min to dissolve into Bi3+The concentration is 0.033mol/L, Fe3+A bismuth nitrate-ferric nitrate mixed solution B with the concentration of 0.030 mol/L;
(3) slowly dropwise adding the mixed solution B prepared in the step (2) into the solution A prepared in the step (1), ultrasonically stirring for 30min, then adjusting the pH to 10.0 by using 8mol/L KOH solution, and continuously ultrasonically stirring for 3.5h at room temperature to obtain a mixture C;
(4) adding 0.88g of purified sepiolite into the mixture C obtained in the step (3), and ultrasonically stirring for 70min to obtain a mixture D;
(5) transferring the mixture D prepared in the step (4) into a high-pressure reaction kettle, and reacting for 5 hours at 210 ℃; and cooling to room temperature, filtering, washing filter residues with deionized water and ethanol for 5 times respectively, and drying at 105 ℃ to constant weight to obtain 2.33g of the bismuthyl carbonate/sepiolite composite photocatalyst.
Example 5
1) Adding 5.47g of hexadecyl trimethyl ammonium bromide into 110mL of ethylene glycol, and ultrasonically stirring for 25min to prepare a hexadecyl trimethyl ammonium bromide-ethylene glycol solution A with the concentration of 0.14 mol/L;
(2) respectively adding 2.94g of 99.0 percent bismuth nitrate pentahydrate and 2.46g of 98.5 percent ferric nitrate nonahydrate into 182mL of deionized water, and ultrasonically stirring for 25min to dissolve into Bi3+The concentration is 0.033mol/L, Fe3+A bismuth nitrate-ferric nitrate mixed solution B with the concentration of 0.033 mol/L;
(3) slowly dropwise adding the mixed solution B prepared in the step (2) into the solution A prepared in the step (1), ultrasonically stirring for 25min, then adjusting the pH to 10.2 by using 8mol/L NaOH solution, and continuously ultrasonically stirring for 4h at room temperature to obtain a mixture C;
(4) adding 1.21g of purified sepiolite into the mixture C obtained in the step (3), and ultrasonically stirring for 80min to obtain a mixture D;
(5) transferring the mixture D prepared in the step (4) into a high-pressure reaction kettle, and reacting for 5.5 hours at 200 ℃; and cooling to room temperature, filtering, washing filter residues with deionized water and ethanol for 2 times respectively, and drying at 100 ℃ to constant weight to obtain 2.64g of the bismuthyl carbonate/sepiolite composite photocatalyst.
Example 6
1) Adding 5.47g of hexadecyl trimethyl ammonium bromide into 100mL of ethylene glycol, and ultrasonically stirring for 35min to prepare a hexadecyl trimethyl ammonium bromide-ethylene glycol solution A with the concentration of 0.15 mol/L;
(2) respectively adding 2.94g of 99.0 percent bismuth nitrate pentahydrate and 2.34g of 98.5 percent ferric nitrate nonahydrate into 220mL of deionized water, and ultrasonically stirring for 25min to dissolve into Bi3+The concentration is 0.027mol/L, Fe3+A bismuth nitrate-ferric nitrate mixed solution B with the concentration of 0.026 mol/L;
(3) slowly dropwise adding the mixed solution B prepared in the step (2) into the solution A prepared in the step (1), ultrasonically stirring for 30min, then adjusting the pH to 10.5 by using a 12mol/L NaOH solution, and continuously ultrasonically stirring for 3.5h at room temperature to obtain a mixture C;
(4) adding 1.18g of purified sepiolite into the mixture C obtained in the step (3), and ultrasonically stirring for 80min to obtain a mixture D;
(5) transferring the mixture D prepared in the step (4) into a high-pressure reaction kettle, and reacting for 6 hours at 180 ℃; and cooling to room temperature, filtering, washing filter residues with deionized water and ethanol for 4 times respectively, and drying at 100 ℃ to constant weight to obtain 2.67g of the bismuthyl carbonate/sepiolite composite photocatalyst.
Examples 7 to 9 are photocatalytic degradation performance test examples
Example 7
The photocatalytic performance test conditions were as follows: the bismuth oxycarbonate/sepiolite composite photocatalyst prepared in example 3 (Bi) was used as a light source at room temperature under a 300W xenon lamp2O2CO3/Sepiolite，m(Bi2O2CO3) M (Sepilolite) 1: 0.4 and preparation of bismuth subcarbonate (Bi) in the absence of sepiolite under identical conditions2O2CO3) As a test sample, the degradation rate of rhodamine B (RhB) is used as an evaluation index. The specific operation steps are as follows: a clean 100mL jacketed beaker was charged with 50mg photocatalyst sample and 50mL of 60mg/L RhB solution, each at equal distances from the light source. Standing in dark for 30min to ensure that RhB is in the sampleThe surface adsorption and desorption reach equilibrium; and (3) degrading under the illumination of a 300W xenon lamp, and sampling once every 15min in the degradation process, wherein the sampling volume is 2 mL. The sample was injected into a centrifuge tube and centrifuged to take out the supernatant, the concentration was measured at 554nm in a UV-3600 UV-visible spectrophotometer (Shimazu, Japan), the degradation rates at different degradation times were calculated, and a degradation curve graph was obtained by plotting the degradation rates against time, as shown in FIG. 4. A water sample with illumination for 90min is taken to determine the total organic carbon in a TOC-LCPH type total organic carbon analyzer (Shimadzu, Japan), and the degradation rate of the total organic carbon is calculated.
As can be seen from fig. 4, the adsorption/desorption equilibrium was reached at 30min in the dark room, with a decrease in RhB concentration of about 5.8%; the light irradiation is carried out for 90min without adding the photocatalyst, and the self-degradation rate is very low; with sample Bi2O2CO3/Sepiolite(m(Bi2O2CO3) M (Sepilolite) is 1: 0.4) as catalyst, the degradation rate of Rh B reaches 99.1 percent; and Bi2O2CO3As a catalyst, the degradation rate of RhB is only 62.5 percent after the irradiation for 90 min. Thus, Bi2O2CO3/Sepiolite(m(Bi2O2CO3) M (sepiolite) 1: 0.4) has excellent photocatalytic degradation properties for RhB.
After measuring and irradiating for 90min, Bi2O2CO3/Sepiolite(m(Bi2O2CO3) M (Sepilolite) 1: 0.4) and Bi2O2CO3The Total Organic Carbon (TOC) removal was 71.23% and 29.76%, respectively. Thus, Bi2O2CO3/Sepiolite(m(Bi2O2CO3) M (sepiolite) 1: 0.4) has excellent mineralization ability on RhB.
Example 8
Bi after degradation2O2CO3And separating and recycling the/Sepiolite composite photocatalyst to be used as the photocatalyst for the next experiment. The experimental conditions and procedures and test methods were the same as in example 7. The degradation rate was varied by 5 cycles as shown in FIG. 5.
As can be seen from FIG. 5, Bi is recycled for 5 times2O2CO3The catalytic degradation rate of the/Sepiolite composite photocatalyst to RhB is reduced from 99.1% at the 1 st time to 94.7% at the 5 th time, and is only reduced by 4.4%. The results show that the Bi prepared by the invention2O2CO3the/Sepiolite composite photocatalyst has excellent recycling and recycling performance.
Example 9
This example is an example of photocatalytic bleaching performance, with the following test conditions: 10mg of Methyl Orange (MO), Methylene Blue (MB) and Fluorescein (FS) were dissolved in 1L of distilled water to prepare a simulated mixed solution (MO-MB-FS), and the bismuth oxycarbonate/sepiolite composite photocatalyst (Bi) prepared in example 3 was used2O2CO3/Sepiolite，m(Bi2O2CO3) M (Sepilolite) 1: 0.4 and bismuth subcarbonate (Bi) prepared under the same conditions in the absence of sepiolite2O2CO3) Is a photocatalyst sample. A clean 200mL jacketed beaker was charged with 100mg of photocatalyst sample and 100mL of MO-MB-FS solution. Standing in the dark for 30min, then degrading under the illumination of a 300W xenon lamp, sampling once every 15min in the degradation process, wherein the sampling volume is 2mL, and measuring the solution chroma by a dilution multiple method after centrifugal separation, wherein the results are shown in Table 1.
TABLE 1 change in solution color with time of illumination
The results in Table 1 show that Bi2O2CO3the/Sepiolite has excellent photocatalytic decoloring capability on mixed dye solution, can be completely decolored after being irradiated for 90min, and is obviously superior to Bi without Sepiolite2O2CO3. The above is only a preferred embodiment of the present invention, and those skilled in the art can make various modifications and changes to the above concept, for example, the composition and process conditions are combined and changed within the scope of the composition and process conditions given by the present invention, and such changes and modifications are all within the spirit of the present invention.
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| CN113546650A (en) * | 2021-07-20 | 2021-10-26 | 辽宁大学 | Bismuth tungstate-bismuth oxyfluoride composite photocatalyst and preparation method and application thereof |
| CN115634702A (en) * | 2021-07-20 | 2023-01-24 | 南昌航空大学 | Bismuth oxycarbonate/biochar composite photocatalyst and preparation method and application thereof |
| CN115028200A (en) * | 2022-05-16 | 2022-09-09 | 大连理工大学 | A kind of preparation method of bismuth oxide/bismuth oxycarbonate composite electrode material |
| CN115028200B (en) * | 2022-05-16 | 2023-02-21 | 大连理工大学 | Preparation method of bismuth oxide/bismuth oxycarbonate composite electrode material |
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