CN108722428B - Composite material for photocatalytic degradation of organic matters and application thereof - Google Patents
Composite material for photocatalytic degradation of organic matters and application thereof Download PDFInfo
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- 239000002131 composite material Substances 0.000 title claims abstract description 34
- 238000013033 photocatalytic degradation reaction Methods 0.000 title claims abstract description 12
- 229910052797 bismuth Inorganic materials 0.000 claims abstract description 23
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 claims abstract description 23
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 claims abstract description 20
- 150000001875 compounds Chemical class 0.000 claims abstract description 19
- 238000003756 stirring Methods 0.000 claims abstract description 17
- 238000002156 mixing Methods 0.000 claims abstract description 14
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000001035 drying Methods 0.000 claims abstract description 12
- 238000005406 washing Methods 0.000 claims abstract description 11
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 10
- 239000011259 mixed solution Substances 0.000 claims abstract description 10
- 229910001961 silver nitrate Inorganic materials 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000007795 chemical reaction product Substances 0.000 claims abstract description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052802 copper Inorganic materials 0.000 claims abstract description 8
- 239000010949 copper Substances 0.000 claims abstract description 8
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000001027 hydrothermal synthesis Methods 0.000 claims abstract description 7
- 150000007529 inorganic bases Chemical class 0.000 claims abstract description 7
- 239000004094 surface-active agent Substances 0.000 claims abstract description 7
- 238000006722 reduction reaction Methods 0.000 claims abstract description 5
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 27
- 239000012279 sodium borohydride Substances 0.000 claims description 6
- 229910000033 sodium borohydride Inorganic materials 0.000 claims description 6
- LZZYPRNAOMGNLH-UHFFFAOYSA-M Cetrimonium bromide Chemical group [Br-].CCCCCCCCCCCCCCCC[N+](C)(C)C LZZYPRNAOMGNLH-UHFFFAOYSA-M 0.000 claims description 5
- 239000005416 organic matter Substances 0.000 claims description 5
- XTVVROIMIGLXTD-UHFFFAOYSA-N copper(II) nitrate Chemical compound [Cu+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O XTVVROIMIGLXTD-UHFFFAOYSA-N 0.000 claims description 4
- 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
- 230000015556 catabolic process Effects 0.000 abstract description 13
- 238000006731 degradation reaction Methods 0.000 abstract description 13
- 239000000975 dye Substances 0.000 abstract description 7
- 239000000463 material Substances 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 7
- 239000002957 persistent organic pollutant Substances 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000011161 development Methods 0.000 abstract description 3
- 238000002360 preparation method Methods 0.000 abstract description 2
- 238000000746 purification Methods 0.000 abstract description 2
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 18
- IQFVPQOLBLOTPF-HKXUKFGYSA-L congo red Chemical compound [Na+].[Na+].C1=CC=CC2=C(N)C(/N=N/C3=CC=C(C=C3)C3=CC=C(C=C3)/N=N/C3=C(C4=CC=CC=C4C(=C3)S([O-])(=O)=O)N)=CC(S([O-])(=O)=O)=C21 IQFVPQOLBLOTPF-HKXUKFGYSA-L 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 239000000243 solution Substances 0.000 description 6
- 230000003197 catalytic effect Effects 0.000 description 5
- 229910052709 silver Inorganic materials 0.000 description 4
- 239000004332 silver Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000003917 TEM image Methods 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000000593 degrading effect Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000005189 flocculation Methods 0.000 description 2
- 230000016615 flocculation Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 238000002835 absorbance Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000003421 catalytic decomposition reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- STZCRXQWRGQSJD-GEEYTBSJSA-M methyl orange Chemical compound [Na+].C1=CC(N(C)C)=CC=C1\N=N\C1=CC=C(S([O-])(=O)=O)C=C1 STZCRXQWRGQSJD-GEEYTBSJSA-M 0.000 description 1
- 229940012189 methyl orange Drugs 0.000 description 1
- 239000002135 nanosheet Substances 0.000 description 1
- 230000001699 photocatalysis Effects 0.000 description 1
- 238000007146 photocatalysis Methods 0.000 description 1
- 239000011941 photocatalyst Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000002336 sorption--desorption measurement Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000000870 ultraviolet spectroscopy Methods 0.000 description 1
- 238000002211 ultraviolet spectrum Methods 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
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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
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/89—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with noble metals
- B01J23/8933—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with noble metals also combined with metals, or metal oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/8973—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with noble metals also combined with metals, or metal oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with arsenic, antimony or bismuth
-
- B01J35/39—
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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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/03—Precipitation; Co-precipitation
- B01J37/031—Precipitation
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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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/08—Heat treatment
- B01J37/10—Heat treatment in the presence of water, e.g. steam
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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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/16—Reducing
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- 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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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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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- C02F2101/34—Organic compounds containing oxygen
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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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- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- 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
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/10—Photocatalysts
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Abstract
The invention relates to a composite material for photocatalytic degradation of organic matters, which is prepared by a method comprising the following steps: (1) fully mixing a bismuth-containing compound and a copper-containing compound in water, adding inorganic base to flocculate, fully stirring, then adding thiourea and a surfactant, and fully mixing to obtain a mixed solution; (2) carrying out hydrothermal reaction on the mixed solution, and washing and drying a reaction product to obtain a bismuth-series oxide; (3) and mixing the bismuth-series oxide and silver nitrate in water, adding a reducing agent to carry out reduction reaction, and washing and drying a reaction product to obtain the bismuth-series oxide. The composite material provided by the invention has the advantages of simple preparation process, easily controlled parameters and stable performance, has very excellent degradation capability on organic matters, especially organic dyes and organic pollutants in a visible light region, and is an environment-friendly purification material with great development potential and wide market prospect.
Description
Technical Field
The invention relates to the field of photocatalytic degradation of organic matters, in particular to a composite material for photocatalytic degradation of organic matters.
Background
Environmental pollution is an important problem in the twenty-first century, and people must face increasingly worse environmental problems while enjoying the benefits of high-speed development of science and technology. Many environmental pollutions have seriously threatened the health of people and even further cause the death of people. The method utilizes solar energy to degrade harmful organic matters into a clean, simple and potential means. The commonly used photocatalyst is TiO2However, the forbidden band width of the material itself limits its application to absorb only the ultraviolet spectrum band in the solar spectrum.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a composite material which can efficiently degrade organic matters in a visible light region. The composite material is compounded by specific bismuth-based oxide and silver, has high catalytic decomposition capacity on organic matters in a visible light region, and can be effectively used for purifying the organic matters on various occasions.
Specifically, the composite material for photocatalytic degradation of organic matters is prepared by the method comprising the following steps:
(1) fully mixing a bismuth-containing compound and a copper-containing compound in water, adding inorganic base to flocculate, fully stirring, then adding thiourea and a surfactant, and fully mixing to obtain a mixed solution;
(2) carrying out hydrothermal reaction on the mixed solution, and washing and drying a reaction product to obtain a bismuth-series oxide;
(3) and mixing the bismuth-series oxide and silver nitrate in water, adding a reducing agent to carry out reduction reaction, and washing and drying a reaction product to obtain the bismuth-series oxide.
The specific reaction raw materials are added in the step (1) of the invention in a specific sequence, so that the raw materials can be fully combined in an ideal manner, and the obtained product has good physical form and catalytic activity. Wherein the bismuth-containing compound is an oxide or an oxysalt of bismuth, preferably bismuth nitrate; the copper-containing compound is an oxide or an oxysalt of copper, preferably copper nitrate. In order to ensure that the elements can better play a synergistic effect, the invention preferably selects that the mass ratio of the bismuth-containing compound to the copper-containing compound to the thiourea is 2-3: 2-3: 0.5 to 1.5.
In order to promote the reaction to proceed sufficiently and ensure the desired morphology of the obtained product, the present invention preferably adds an inorganic base (preferably sodium hydroxide) and a surfactant (preferably cetyltrimethylammonium bromide, CTAB) to the reaction system. The ratio of the addition amount of the inorganic base to the mass of the bismuth-containing compound is preferably 1 to 2: 2-3; the mass ratio of the addition amount of the surfactant to the bismuth-containing compound is preferably 0.1-0.3: 2 to 3.
The hydrothermal reaction in step (2) of the present invention is a conventional method in the art. In order to ensure that the specific raw materials adopted in the present invention can be sufficiently reacted, the hydrothermal reaction is preferably carried out at 170 to 190 ℃; more preferably, the hydrothermal reaction is carried out at 175 to 185 ℃ for 10 to 15 hours. The washing and drying are all conventional operations in the art, and the present invention is not particularly limited.
The bismuth-based oxide obtained in the step (2) is layered powder. The bismuth-based oxide in the form of layered powder has a large specific surface area, and a composite material formed by compounding the bismuth-based oxide with silver has high catalytic efficiency, so that the high-efficiency degradation of organic matters can be realized.
In the step (3), in order to ensure that the bismuth-based oxide and silver have synergistic effect and better realize catalytic degradation effect, the mass ratio of the bismuth-based oxide to the silver nitrate is 100: 0.5-1.5, when the ratio of the two reaches 100: 1.5, the catalytic efficiency of the obtained composite material is better.
The reducing agent in the step (3) can adopt a conventional reagent in the field; in order to sufficiently combine the bismuth-based oxide and silver in an optimal state to sufficiently exert a catalytic effect, the reducing agent is preferably formed by mixing sodium hydroxide and sodium borohydride, and more preferably, the reducing agent and the sodium borohydride are mixed in a mass ratio of 1: 0.1 to 0.3.
The reduction reaction in the step (3) can be carried out at normal temperature, and the solution can be rapidly stirred after the reducing agent is added so as to promote the reaction to be fully carried out. The washing and drying of the reaction product are conventional operations in the art, and the present invention is not particularly limited.
As a specific preferred scheme of the present invention, the composite material is prepared by a method comprising the following steps:
(1) mixing 2-3 parts of bismuth nitrate and water, adding 2-3 parts of copper nitrate after fully stirring, adding 1-2 parts of sodium hydroxide after fully stirring, stirring until flocculation, continuing stirring for 5-15 minutes, adding 0.5-1.5 parts of thiourea and 0.1-0.3 part of hexadecyl trimethyl ammonium bromide, and fully stirring to obtain a brown mixed solution;
(2) putting the mixed solution into a hydrothermal kettle, heating to 175-185 ℃, and carrying out heat preservation reaction for 10-15 h; washing and drying the reaction product to obtain bismuth-series oxide;
(3) mixing the bismuth-based oxide and silver nitrate according to a mass ratio of 100: 1-1.5, dissolving in water, and adding sodium hydroxide and sodium borohydride in a mass ratio of 1: 0.1-0.3, quickly stirring and reacting, and washing and drying the obtained reaction product to obtain the catalyst.
The parts in the present invention are specifically parts by mass, and may be specific units by mass such as g and kg known in the art.
The invention further protects the application of the composite material in photocatalytic degradation of organic matters. The product provided by the invention is preferably carried out in a visible light range when organic matters are degraded. The degraded organic matter may be organic dyes (e.g., congo red, methyl orange, etc.) or organic pollutants (e.g., formaldehyde, etc.).
The composite material provided by the invention has the advantages of simple preparation process, easily controlled parameters and stable performance, has very excellent degradation capability on organic matters, especially organic dyes and organic pollutants in a visible light region, and is an environment-friendly purification material with great development potential and wide market prospect.
Drawings
FIG. 1 is an SEM image (FIG. 1a) and a TEM image (FIG. 1b) of the composite material prepared in example 1.
Fig. 2 is an XRD pattern of the composite material prepared in example 1.
Fig. 3 is an XPS plot of the composite prepared in example 1.
FIG. 4 is a graph showing the results of the composite material degrading organic dyes in the visible region.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
Example 1
The embodiment provides a composite material for photocatalytic degradation of organic matters, which is prepared by the following method:
(1) mixing 2.4g of bismuth nitrate with 60ml of deionized water, stirring for 10 minutes, adding 2.6g of copper nitrate powder, stirring for 10 minutes until the solution turns blue, adding 1.6g of NaOH, stirring until flocculation is achieved, then continuing stirring for 10 minutes, adding 1g of thiourea and 0.16g of CTAB, and stirring for 10 minutes to obtain a brown mixed solution;
(2) putting the mixed solution into a hydrothermal kettle, heating to 180 ℃, and preserving heat for 12 hours; after the reaction is finished, repeatedly cleaning for three times and drying to obtain bismuth-series oxide;
(3) preparing 0.5g of the bismuth-based oxide and 0.0025g of silver nitrate into an aqueous solution, adding 2.5ml of a reducing agent (1.0g of sodium hydroxide and 0.18915g of sodium borohydride are dissolved in water, fixing the volume to 50ml), quickly stirring for half an hour, washing for 3 times, and drying at 60 ℃ to obtain the bismuth-based oxide.
The composite material obtained in this example has an SEM image as shown in FIG. 1a, a TEM image as shown in FIG. 1b, an XRD image as shown in FIG. 2, and an XPS image as shown in FIG. 3. The above results indicate that the present invention successfully prepared two-dimensional nano-sheet materials.
Example 2
This example provides a composite material for photocatalytic degradation of organic matter, which differs from example 1 only in that: the dosage of the silver nitrate is 0.005 g.
Example 3
This example provides a composite material for photocatalytic degradation of organic matter, which differs from example 1 only in that: the dosage of the silver nitrate is 0.0075 g.
Experimental example 1
The experimental example verifies the degradation effect of the composite material provided by the above embodiments on the organic dye congo red.
The specific experimental method is as follows: respectively taking 100ml of Congo red solution with the concentration of 100mg/L, respectively adding 0.1g of composite material sample, and magnetically stirring for 2 hours in the dark at room temperature to ensure that the catalyst and dye molecules reach the dynamic equilibrium of adsorption-desorption. A300W xenon lamp is used as a light source, and visible light (lambda is more than or equal to 420nm and less than or equal to 780nm) is obtained through the combination of a reflecting sheet and a filter. The photocatalysis is carried out in a constant temperature environment, a light source adopts a top illumination mode, 3mL of Congo red solution is taken every 20min, the Congo red solution is centrifuged for two times (7000rpm, 3min), supernatant liquid is taken, an absorbance value at 495nm of the Congo red solution is measured by adopting an ultraviolet visible spectrophotometer (Hitachi, UV-3100), and the change of the Congo red concentration is calculated to obtain the change trend of the Congo red concentration along with time.
The test shows that the degradation effect of congo red is shown in table 1; partial results can be seen in reference to fig. 4.
Table 1: congo Red degradation efficiency (1-C)t/C0)
| t is 10min | t is 20min | t is 30min | t is 40min | |
| Example 1 | 0.03 | 0.13 | 0.17 | 0.2 |
| Example 2 | 0.525 | 0.66 | 0.694 | 0.72 |
| Example 3 | 0.61 | 0.74 | 0.75 | 0.78 |
From the above results, the composite material provided by the present invention has an excellent degradation effect on organic dyes in a short time; wherein, the composite material provided in example 3 can achieve higher degradation efficiency in a short time.
Experimental example 2
The experimental example verifies the degradation effect of the material provided by each example on the organic pollutant formaldehyde. The specific method comprises the following steps:
0.1g of each of the composite materials obtained in examples was taken as commercially available 0.1g of TiO2The materials used as comparative examples were each introduced into a closed vessel having a volume of 12.5L and a theoretical formaldehyde content of 0.6698 g. And placing the closed container under visible light for reaction. The degradation effect of formaldehyde was measured by the formaldehyde measuring method (GB/T18204.26-2000) and is shown in Table 2.
Table 2: efficiency of Formaldehyde degradation (1-C)t/C0)
| t is 60min | |
| Example 1 | 0.75 |
| Example 2 | 0.77 |
| Example 3 | 0.82 |
| Comparative example | 0.21 |
From the above results, the composite material provided by the present invention has an excellent degradation effect on organic pollutants in a short time; among them, the compound provided in example 3 is the most effective in degrading formaldehyde.
Although the invention has been described in detail hereinabove by way of general description, specific embodiments and experiments, it will be apparent to those skilled in the art that many modifications and improvements can be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (7)
1. The composite material for photocatalytic degradation of organic matters is characterized by being prepared by the following steps:
(1) fully mixing a bismuth-containing compound and a copper-containing compound in water, adding inorganic base to flocculate, fully stirring, then adding thiourea and a surfactant, and fully mixing to obtain a mixed solution;
the bismuth-containing compound is bismuth nitrate, and the copper-containing compound is copper nitrate;
the mass ratio of the bismuth-containing compound to the copper-containing compound to the thiourea is 2-3: 2-3: 0.5 to 1.5;
(2) carrying out hydrothermal reaction on the mixed solution, and washing and drying a reaction product to obtain a bismuth-series oxide;
the hydrothermal reaction is carried out for 10-15 h at 175-185 ℃;
(3) mixing the bismuth-series oxide and silver nitrate in water, adding a reducing agent for reduction reaction, and washing and drying a reaction product to obtain the bismuth-series oxide;
the mass ratio of the bismuth-series oxide to the silver nitrate is 100: 0.5-1.5, wherein the reducing agent is formed by mixing sodium hydroxide and sodium borohydride.
2. The composite material according to claim 1, characterized in that the inorganic base is sodium hydroxide; the mass ratio of the inorganic base to the bismuth-containing compound is 1-2: 2 to 3.
3. The composite material of claim 1, wherein the surfactant is cetyl trimethylammonium bromide; the mass ratio of the surfactant to the bismuth-containing compound is 0.1-0.3: 2 to 3.
4. The composite material according to any one of claims 1 to 3, wherein the mass ratio of the bismuth-based oxide to the silver nitrate is 100: 1.5.
5. the composite material according to claim 1, wherein the mass ratio of sodium hydroxide to sodium borohydride in the reducing agent is 1: 0.1 to 0.3.
6. The composite material according to claim 1, wherein the reduction reaction is carried out under stirring at normal temperature.
7. The use of the composite material of any one of claims 1 to 6 for photocatalytic degradation of organic matter; the organic matter is organic dye.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810561777.3A CN108722428B (en) | 2018-06-04 | 2018-06-04 | Composite material for photocatalytic degradation of organic matters and application thereof |
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|---|---|---|---|
| CN201810561777.3A CN108722428B (en) | 2018-06-04 | 2018-06-04 | Composite material for photocatalytic degradation of organic matters and application thereof |
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| Publication Number | Publication Date |
|---|---|
| CN108722428A CN108722428A (en) | 2018-11-02 |
| CN108722428B true CN108722428B (en) | 2021-03-16 |
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