CN108855140A - A kind of CuS/Bi2WO6Heterojunction photocatalyst and its preparation method and application - Google Patents
A kind of CuS/Bi2WO6Heterojunction photocatalyst and its preparation method and application Download PDFInfo
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- 239000011941 photocatalyst Substances 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title claims abstract description 29
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 claims abstract description 24
- OPQARKPSCNTWTJ-UHFFFAOYSA-L copper(ii) acetate Chemical compound [Cu+2].CC([O-])=O.CC([O-])=O OPQARKPSCNTWTJ-UHFFFAOYSA-L 0.000 claims abstract description 13
- 239000000243 solution Substances 0.000 claims description 57
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 51
- 239000011259 mixed solution Substances 0.000 claims description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 24
- 239000008367 deionised water Substances 0.000 claims description 12
- 229910021641 deionized water Inorganic materials 0.000 claims description 12
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- 229960000935 dehydrated alcohol Drugs 0.000 claims description 10
- 238000005406 washing Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 8
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- 238000006731 degradation reaction Methods 0.000 claims description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 2
- 229910017604 nitric acid Inorganic materials 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 239000010865 sewage Substances 0.000 claims description 2
- 230000001699 photocatalysis Effects 0.000 abstract description 12
- 239000003054 catalyst Substances 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- 238000006555 catalytic reaction Methods 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 5
- 239000002077 nanosphere Substances 0.000 abstract description 5
- 239000004065 semiconductor Substances 0.000 abstract description 4
- 238000010521 absorption reaction Methods 0.000 abstract description 3
- 238000001027 hydrothermal synthesis Methods 0.000 abstract description 3
- 238000011065 in-situ storage Methods 0.000 abstract description 3
- 239000002135 nanosheet Substances 0.000 abstract description 3
- 239000002245 particle Substances 0.000 abstract description 3
- 239000004094 surface-active agent Substances 0.000 abstract description 3
- 239000012535 impurity Substances 0.000 abstract description 2
- 231100000252 nontoxic Toxicity 0.000 abstract description 2
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- 230000005501 phase interface Effects 0.000 abstract description 2
- 239000002244 precipitate Substances 0.000 abstract description 2
- 239000002243 precursor Substances 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract description 2
- 239000007787 solid Substances 0.000 description 16
- 238000003756 stirring Methods 0.000 description 16
- 238000001035 drying Methods 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 8
- 238000013019 agitation Methods 0.000 description 7
- PYWVYCXTNDRMGF-UHFFFAOYSA-N rhodamine B Chemical compound [Cl-].C=12C=CC(=[N+](CC)CC)C=C2OC2=CC(N(CC)CC)=CC=C2C=1C1=CC=CC=C1C(O)=O PYWVYCXTNDRMGF-UHFFFAOYSA-N 0.000 description 7
- 229940043267 rhodamine b Drugs 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 238000007146 photocatalysis Methods 0.000 description 6
- 239000000843 powder Substances 0.000 description 6
- 239000002253 acid Substances 0.000 description 4
- 238000013033 photocatalytic degradation reaction Methods 0.000 description 4
- 238000001228 spectrum Methods 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
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- 238000012360 testing method Methods 0.000 description 2
- 229910052724 xenon Inorganic materials 0.000 description 2
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 2
- PMUIBVMKQVKHBE-UHFFFAOYSA-N [S].NC(N)=O Chemical compound [S].NC(N)=O PMUIBVMKQVKHBE-UHFFFAOYSA-N 0.000 description 1
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- 231100001261 hazardous Toxicity 0.000 description 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910000000 metal hydroxide Inorganic materials 0.000 description 1
- 150000004692 metal hydroxides Chemical class 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000004005 microsphere 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
- B01J27/02—Sulfur, selenium or tellurium; Compounds thereof
- B01J27/04—Sulfides
-
- 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
- B01J23/002—Mixed oxides other than spinels, e.g. perovskite
-
- B01J35/23—
-
- 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
- B01J37/02—Impregnation, coating or precipitation
- B01J37/03—Precipitation; Co-precipitation
- B01J37/031—Precipitation
-
- 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
-
- 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
- C02F2101/308—Dyes; Colorants; Fluorescent agents
-
- 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
- C02F2101/36—Organic compounds containing halogen
-
- 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
- C02F2101/38—Organic compounds containing nitrogen
-
- 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
-
- 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 present invention provides a kind of CuS/Bi2WO6Heterojunction photocatalyst and its preparation method and application.The present invention is by Bi2WO6It is added to using thiocarbamide and copper acetate to pass through co-precipitation-hydro-thermal method fabricated in situ CuS/Bi in the CuS precursor solution of raw material2WO6, the CuS/Bi of nanosphere structure can be produced not needing surfactant and complicated technology condition2WO6Heterojunction photocatalyst, preparation process is simple, at low cost, and non-toxic, reaction condition controllability is strong, and the microscopic particles of photochemical catalyst obtained are CuS nanosheet Dispersed precipitate in Bi2WO6Nanosphere surface, two kinds of phase interfaces form heterojunction structure, to enhance the absorption region of visible light, more single CuS semiconductor has superior photocatalytic activity, more single Bi2WO6There is better acid-resisting, while catalyst crystallinity with higher in light-catalyzed reaction, no other impurities generate.
Description
Technical field
The invention belongs to photocatalyst technology fields, and in particular to a kind of CuS/Bi2WO6Heterojunction photocatalyst and its system
Preparation Method and application.
Background technique
The industrial organic waste waters discharge amounts such as medicine, printing and dyeing, papermaking are big and bad containing can largely generate to human health
The Recalcitrant chemicals of influence are that water ecological environment is caused to destroy, seriously affect the major source of pollutant that water resource utilizes.Photocatalysis
Technology can convert chemical energy or electric energy for the solar energy of " green " using conductor photocatalysis material, in mild reaction condition
Under effectively remove organic pollutant in water body, be to solve one of most potential technology of energy and environmental problem.
In recent years, in order to improve the photocatalytic activity and stability of semiconductor catalysis material, domestic and international researcher is developed
A large amount of novel photocatalysis materials, such as construct type new compound, multi-element metal oxide, lamellar compound, metal hydroxides
Deng.Bi2WO6As it is rare it is several under visible light illumination can with photocatalytic water, and can be used to degradable organic pollutant light urge
Agent is the hot spot of photocatalysis field research in recent years.However tradition Bi2WO6Wolframic acid, stability can be resolved into acid condition
It is not high, it is difficult to meet the requirement of practical application.Therefore, it is necessary to take suitable measure to improve Bi2WO6Acid-resisting, improve it
Degree of stability, so that reaction can be gone on smoothly.The preparation of most of composite photo-catalyst mostly uses greatly multistep at this stage
The contact area of two kinds of semiconductors is limited in growth method and hetero-junctions, preparation process is cumbersome, is easy to produce other toxic objects
Matter pollutes environment etc..Therefore, a kind of green, easy heterojunction photocatalyst preparation method are developed for photocatalytic degradation water body
In organic pollutant be of great significance.
Summary of the invention
For the above-mentioned problems in the prior art, the present invention provides a kind of CuS/Bi2WO6Heterojunction photocatalyst and
Preparation method and application, preparation process is simple, at low cost, and poisonous and hazardous surfactant is not introduced into preparation process,
Photochemical catalyst photocatalytic activity obtained is excellent.
To achieve the above object, the technical solution adopted by the present invention to solve the technical problems is：
A kind of CuS/Bi2WO6Heterojunction photocatalyst, preparation method includes the following steps：
(1) by CuS and Bi2WO6It is in molar ratio 1:1-6 mixing；
(2) mixed solution pH value obtained by regulating step (1) is 4-6, continues to stir 20-40min, is allowed to uniformly mixed；
(3) step (2) gains are reacted into 6-12h under the conditions of 140-160 DEG C, cooled to room temperature is washed, and is dried
It is dry, it is made.
Further, CuS and Bi in step (1)2WO6Molar ratio be 1:4.
Further, CuS is prepared by the following method to obtain：Copper acetate is dissolved in ethylene glycol, solution A is made；By sulphur
Urea is dissolved in ethylene glycol, and solution B is made, and solution A and solution B are uniformly mixed, and is made.
Further, the molar ratio of copper acetate and thiocarbamide is 1:4.
Further, the middle acetic acid of step (2) or nitric acid adjust the pH value of mixed solution.
Further, step (2) gains are reacted into 12h under the conditions of 160 DEG C in step (3).
Further, it is alternately washed when washing using deionized water and dehydrated alcohol in step (3).
Using CuS/Bi made from the above method2WO6Application of the heterojunction photocatalyst in sewage degradation.
CuS/Bi provided by the invention2WO6Heterojunction photocatalyst and preparation method thereof has the advantages that：
(1) band gap of CuS is 1.76eV-2.48eV, it may have certain photocatalysis performance, but it is in light-catalyzed reaction
The transport efficiency of responsiveness and photo-generated carrier to light be not it is very high, by Bi2WO6It is compounded to form hetero-junctions with CuS, is had
Conducive to the optical response range for expanding CuS and promote efficiently separating for electron hole pair, to improve the photocatalysis effect of single CuS
Rate, and CuS/Bi2WO6Composite photo-catalyst is high in acid condition stability, and has embodied excellent light during the experiment
Catalytic activity.
(2) of the invention by Bi2WO6It is added to using thiocarbamide and copper acetate as in the CuS precursor solution of raw material, by coprecipitated
Shallow lake-hydro-thermal method fabricated in situ CuS/Bi2WO6Heterojunction photocatalyst is not needing surfactant and complicated technology condition
Produce the CuS/Bi of nanosphere structure2WO6Heterojunction photocatalyst, preparation process is simple, at low cost, non-toxic, reacts item
Part controllability is strong.
(3) CuS/Bi produced by the present invention2WO6Heterojunction photocatalyst, microscopic particles are CuS nanosheet Dispersed precipitate
In Bi2WO6Nanosphere surface, two kinds of phase interfaces form heterojunction structure.Heterojunction photocatalyst crystallization with higher
Property, no other impurities generate, and by forming heterojunction structure, enhance the absorption region of visible light, more single CuS semiconductor
With superior photocatalytic activity, more single Bi2WO6There is better acid-resisting in light-catalyzed reaction.
Detailed description of the invention
Fig. 1 is CuS/Bi made from embodiment 12WO6The XRD diagram of heterojunction photocatalyst.
Fig. 2 is CuS/Bi made from embodiment 12WO6The SEM of heterojunction photocatalyst schemes.
Fig. 3 is CuS/Bi made from embodiment 12WO6Heterojunction photocatalyst photocatalytic degradation rhodamine B under xenon lamp is molten
Liquid (20mg/L) activity figure.
Specific embodiment
Embodiment 1
A kind of CuS/Bi2WO6Heterojunction photocatalyst, preparation method includes the following steps：
(1) under room temperature, it weighs 0.25mmol copper acetate solid to be dissolved in 40mL ethylene glycol, forms solution A；
(2) it weighs 1mmol thiocarbamide to be dissolved in 40mL ethylene glycol, forms solution B；
(3) solution A and solution B are uniformly mixed, 1mmol Bi is added into mixed solution2WO6Solid powder, stirring are equal
It is even；
(4) 36% acetic acid solution is instilled in step (3) resulting mixed solution dropwise under agitation, until mixing
The pH value of solution is 4, continues to stir 30min；
(5) mixed solution obtained by step (4) is moved into 100mL water heating kettle, 12h is reacted under the conditions of 160 DEG C, it is naturally cold
But to room temperature, through deionized water and dehydrated alcohol, alternately washing is placed on 80 DEG C of drying, is made.
Embodiment 2
A kind of CuS/Bi2WO6Heterojunction photocatalyst, preparation method includes the following steps：
(1) under room temperature, it weighs 1mmol copper acetate solid to be dissolved in 40mL ethylene glycol, forms solution A；
(2) it weighs 4mmol thiocarbamide to be dissolved in 40mL ethylene glycol, forms solution B；
(3) solution A and solution B are uniformly mixed, 1mmol Bi is added into mixed solution2WO6Solid powder, stirring are equal
It is even；
(4) 36% acetic acid solution is instilled in step (3) resulting mixed solution dropwise under agitation, until mixing
The pH value of solution is 5, continues to stir 30min；
(5) mixed solution obtained by step (4) is moved into 100mL water heating kettle, 12h is reacted under the conditions of 150 DEG C, it is naturally cold
But to room temperature, through deionized water and dehydrated alcohol, alternately washing is placed on 80 DEG C of drying, is made.
Embodiment 3
A kind of CuS/Bi2WO6Heterojunction photocatalyst, preparation method includes the following steps：
(1) under room temperature, it weighs 0.25mmol copper acetate solid to be dissolved in 40mL ethylene glycol, forms solution A；
(2) it weighs 4mmol thiocarbamide to be dissolved in 40mL ethylene glycol, forms solution B；
(3) solution A and solution B are uniformly mixed, 1.5mmol Bi is added into mixed solution2WO6Solid powder, stirring
Uniformly；
(4) 36% acetic acid solution is instilled in step (3) resulting mixed solution dropwise under agitation, until mixing
The pH value of solution is 6, continues to stir 30min；
(5) mixed solution obtained by step (4) is moved into 100mL water heating kettle, 12h is reacted under the conditions of 140 DEG C, it is naturally cold
But to room temperature, through deionized water and dehydrated alcohol, alternately washing is placed on 80 DEG C of drying, is made.
Embodiment 4
A kind of CuS/Bi2WO6Heterojunction photocatalyst, preparation method includes the following steps：
(1) under room temperature, it weighs 0.25mmol copper acetate solid to be dissolved in 40mL ethylene glycol, forms solution A；
(2) it weighs 1mmol thiocarbamide to be dissolved in 40mL ethylene glycol, forms solution B；
(3) solution A and solution B are uniformly mixed, 1mmol Bi is added into mixed solution2WO6Solid powder, stirring are equal
It is even；
(4) 36% acetic acid solution is instilled in step (3) resulting mixed solution dropwise under agitation, until mixing
The pH value of solution is 5, continues to stir 30min；
(5) mixed solution obtained by step (4) is moved into 100mL water heating kettle, 6h is reacted under the conditions of 150 DEG C, it is naturally cold
But to room temperature, through deionized water and dehydrated alcohol, alternately washing is placed on 80 DEG C of drying, is made.
Embodiment 5
A kind of CuS/Bi2WO6Heterojunction photocatalyst, preparation method includes the following steps：
(1) under room temperature, it weighs 0.25mmol copper acetate solid to be dissolved in 40mL ethylene glycol, forms solution A；
(2) it weighs 1mmol thiocarbamide to be dissolved in 40mL ethylene glycol, forms solution B；
(3) solution A and solution B are uniformly mixed, 1mmol Bi is added into mixed solution2WO6Solid powder, stirring are equal
It is even；
(4) 36% acetic acid solution is instilled in step (3) resulting mixed solution dropwise under agitation, until mixing
The pH value of solution is 6, continues to stir 30min；
(5) mixed solution obtained by step (4) is moved into 100mL water heating kettle, 6h is reacted under the conditions of 140 DEG C, it is naturally cold
But to room temperature, through deionized water and dehydrated alcohol, alternately washing is placed on 80 DEG C of drying, is made.
Embodiment 6
A kind of CuS/Bi2WO6Heterojunction photocatalyst, preparation method includes the following steps：
(1) under room temperature, it weighs 0.25mmol copper acetate solid to be dissolved in 40mL ethylene glycol, forms solution A；
(2) it weighs 1mmol thiocarbamide to be dissolved in 40mL ethylene glycol, forms solution B；
(3) solution A and solution B are uniformly mixed, 1mmol Bi is added into mixed solution2WO6Solid powder, stirring are equal
It is even；
(4) 36% acetic acid solution is instilled in step (3) resulting mixed solution dropwise under agitation, until mixing
The pH value of solution is 4, continues to stir 30min；
(5) mixed solution obtained by step (4) is moved into 100mL water heating kettle, 6h is reacted under the conditions of 160 DEG C, it is naturally cold
But to room temperature, through deionized water and dehydrated alcohol, alternately washing is placed on 80 DEG C of drying, is made.
Comparative example 1
A kind of photochemical catalyst, preparation method includes the following steps：
(1) under room temperature, Bi (NO is weighed3)3·5H2O solid, which is dissolved in deionized water, forms colourless transparent solution；
(2) Na is weighed2WO6·2H2O solid is dissolved in deionized water, it is to be dissolved completely after, be added step (1) obtained by it is molten
In liquid, mixed solution is formed, wherein Bi (NO3)3·5H2O and Na2WO6·2H2The molar ratio of O is 2:1；
(3) 2mol/L NaOH solution is instilled in mixed solution obtained by step (2) dropwise under agitation, until mixed
The pH value for closing solution is 3, continues to stir 30min；
(4) mixed solution obtained by step (3) is moved into 100mL water heating kettle, 14h is reacted under the conditions of 160 DEG C, it is naturally cold
But to room temperature, through deionized water and dehydrated alcohol, alternately washing is placed on 80 DEG C of drying, is made.
Comparative example 2
A kind of photochemical catalyst, preparation method includes the following steps：
(1) under room temperature, 12mol thiocarbamide solid is weighed to be dissolved in 40mL ethylene glycol, it is to be dissolved completely after, weigh
3mmol copper acetate solid, is added while stirring in above-mentioned solution, then weighs 0.4g PVP and above-mentioned solution is added, and stirs 30min；
(2) mixed solution is moved into 100mL water heating kettle, 3h, cooled to room temperature, warp is reacted under the conditions of 160 DEG C
Alternately washing is placed on 80 DEG C of drying for deionized water and dehydrated alcohol, is made.
Test example
1, X ray diffracting spectrum detects
Fig. 1 is CuS/Bi made from embodiment 12WO6The X ray diffracting spectrum of heterojunction photocatalyst, with standard card pair
Than it is found that diffraction maximum and Bi in map2WO6(PDF 00-026-1044) standard diagram matches, and CuS/Bi2WO6It is heterogeneous
It ties and other miscellaneous phases is not present in the diffracting spectrum of photochemical catalyst.X ray diffracting spectrum does not detect the diffraction maximum of CuS, be by
The smaller and high dispersion degree reason in CuS particle.
2, scanning electron microscope
Fig. 2 is CuS/Bi made from embodiment 12WO6The scanning electron microscope diagram piece of heterojunction photocatalyst, can from Fig. 2
To find out that heterojunction photocatalyst obtained shows nanosphere structure, and it is observed that various shape is irregular
CuS nanosheet is attached to microsphere surface, shows that hydrothermal synthesis method can fabricated in situ CuS/Bi2WO6Heterojunction photocatalyst.
3, photocatalytic degradation
Specifically detection process is：Rhodamine B solution with concentration for 20mg/L is degradation object, by comparative example 1, comparative example
2 and the embodiment of the present invention 1 made from each 0.1g of sample, be added 100mL rhodamine B solution in, adsorb 30min under dark condition
Afterwards, mixed reaction solution is moved into water cooling reactive tank and carries out light-catalyzed reaction, used the xenon lamp of 300W to react light source, be used in combination
Optical filter filters off the ultraviolet portion that wavelength is less than 420nm, collects 4mL rhodamine B reaction solution every 10min, utilizes filter paper reality
It is now separated by solid-liquid separation, the absorbance of rhodamine B solution before and after measurement reaction at 554nm.Test result is shown in Fig. 3.
Fig. 3 is Bi2WO6CuS/Bi made from (comparative example 1), CuS (comparative example 2) and embodiment 12WO6Sample is in full striation
The activity figure of rhodamine B (20mg/L) solution that photocatalytic degradation pH value is 3 under part.
It has been found by contrast that CuS/Bi2WO6The photocatalytic activity of sample is substantially better than single CuS sample, and than single
Bi2WO6Sample has better acid-resisting (Bi2WO6Can decompose in acid condition), as illumination 70min, rhodamine B solution
It has been completely degraded.Generally speaking, CuS/Bi2WO6Single CuS and Bi can largely be improved2WO6Absorption property and light
Catalytic activity.
Claims (9)
1. a kind of CuS/Bi2WO6The preparation method of heterojunction photocatalyst, which is characterized in that include the following steps：
(1) by CuS and Bi2WO6It is in molar ratio 1:1-6 mixing；
(2) mixed solution pH value obtained by regulating step (1) is 4-6, is stirred and evenly mixed；
(3) step (2) gains are reacted into 6-12h under the conditions of 140-160 DEG C, cooled to room temperature is washed, and is dried, system
?.
2. CuS/Bi according to claim 12WO6The preparation method of heterojunction photocatalyst, which is characterized in that step (1)
Middle CuS and Bi2WO6Molar ratio be 1:4.
3. CuS/Bi according to claim 1 or 22WO6The preparation method of heterojunction photocatalyst, which is characterized in that CuS
It is prepared by the following method to obtain：Copper acetate is dissolved in ethylene glycol, solution A is made；Thiocarbamide is dissolved in ethylene glycol, is made molten
Liquid B, solution A and solution B are uniformly mixed, and are made.
4. CuS/Bi according to claim 32WO6The preparation method of heterojunction photocatalyst, which is characterized in that copper acetate
Molar ratio with thiocarbamide is 1:4.
5. CuS/Bi according to claim 12WO6The preparation method of heterojunction photocatalyst, which is characterized in that step (2)
The middle pH value that the mixed solution is adjusted with acetic acid or nitric acid.
6. CuS/Bi according to claim 12WO6The preparation method of heterojunction photocatalyst, which is characterized in that step (3)
It is middle that step (2) gains are reacted into 12h under the conditions of 160 DEG C.
7. CuS/Bi according to claim 12WO6The preparation method of heterojunction photocatalyst, which is characterized in that step (3)
It is alternately washed when middle washing using deionized water and dehydrated alcohol.
8. the CuS/Bi being prepared using any one of claim 1-7 method2WO6Heterojunction photocatalyst.
9. CuS/Bi according to any one of claims 82WO6Application of the heterojunction photocatalyst in sewage degradation.
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