CN111715261A - G-C3N4Application of catalyst in degradation of organic dye in high-salt wastewater - Google Patents
G-C3N4Application of catalyst in degradation of organic dye in high-salt wastewater Download PDFInfo
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- 239000003054 catalyst Substances 0.000 title claims abstract description 50
- 239000002351 wastewater Substances 0.000 title claims abstract description 26
- 230000015556 catabolic process Effects 0.000 title claims description 16
- 238000006731 degradation reaction Methods 0.000 title claims description 16
- 238000000034 method Methods 0.000 claims abstract description 13
- 230000000593 degrading effect Effects 0.000 claims abstract description 7
- 230000008569 process Effects 0.000 claims abstract description 5
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- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical group NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 claims description 8
- 239000002243 precursor Substances 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 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 claims description 3
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- 238000005286 illumination Methods 0.000 claims description 2
- 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 claims description 2
- 229940012189 methyl orange Drugs 0.000 claims description 2
- CXKWCBBOMKCUKX-UHFFFAOYSA-M methylene blue Chemical compound [Cl-].C1=CC(N(C)C)=CC2=[S+]C3=CC(N(C)C)=CC=C3N=C21 CXKWCBBOMKCUKX-UHFFFAOYSA-M 0.000 claims description 2
- 229960000907 methylthioninium chloride Drugs 0.000 claims description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 abstract description 35
- 239000011780 sodium chloride Substances 0.000 abstract description 18
- 230000001699 photocatalysis Effects 0.000 abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 7
- 230000007613 environmental effect Effects 0.000 abstract description 6
- 238000003912 environmental pollution Methods 0.000 abstract description 3
- 238000007146 photocatalysis Methods 0.000 abstract description 2
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- 238000002360 preparation method Methods 0.000 description 13
- 239000011941 photocatalyst Substances 0.000 description 9
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- 238000006243 chemical reaction Methods 0.000 description 7
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- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 5
- 238000010335 hydrothermal treatment Methods 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 238000013032 photocatalytic reaction Methods 0.000 description 5
- 241000894007 species Species 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000000635 electron micrograph Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
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- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 3
- 238000002835 absorbance Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000001782 photodegradation Methods 0.000 description 3
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
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- 239000000376 reactant Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229910000014 Bismuth subcarbonate Inorganic materials 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 239000007832 Na2SO4 Substances 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
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- 238000002425 crystallisation Methods 0.000 description 1
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- 230000007547 defect Effects 0.000 description 1
- 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 description 1
- VQHHOXOLUXRQFQ-UHFFFAOYSA-L dipotassium;4,5,6,7-tetrachloro-2',4',5',7'-tetraiodo-3-oxospiro[2-benzofuran-1,9'-xanthene]-3',6'-diolate Chemical compound [K+].[K+].O1C(=O)C(C(=C(Cl)C(Cl)=C2Cl)Cl)=C2C21C1=CC(I)=C([O-])C(I)=C1OC1=C(I)C([O-])=C(I)C=C21 VQHHOXOLUXRQFQ-UHFFFAOYSA-L 0.000 description 1
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- 238000007254 oxidation reaction Methods 0.000 description 1
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- 239000001301 oxygen Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000013033 photocatalytic degradation reaction Methods 0.000 description 1
- 229920000767 polyaniline Polymers 0.000 description 1
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- 238000004064 recycling Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
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- 150000003839 salts Chemical class 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- FJOLTQXXWSRAIX-UHFFFAOYSA-K silver phosphate Chemical compound [Ag+].[Ag+].[Ag+].[O-]P([O-])([O-])=O FJOLTQXXWSRAIX-UHFFFAOYSA-K 0.000 description 1
- 229940019931 silver phosphate Drugs 0.000 description 1
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- 238000002336 sorption--desorption measurement Methods 0.000 description 1
- VEALVRVVWBQVSL-UHFFFAOYSA-N strontium titanate Chemical compound [Sr+2].[O-][Ti]([O-])=O VEALVRVVWBQVSL-UHFFFAOYSA-N 0.000 description 1
- 238000000859 sublimation Methods 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
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/24—Nitrogen compounds
-
- 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
- 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
-
- 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
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
-
- 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
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/10—Photocatalysts
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- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Catalysts (AREA)
Abstract
The invention relates to the technical field of photocatalysis, and particularly discloses G-C3N4The application of the catalyst in degrading organic dye in high-salinity wastewater has the advantages of simple process, low cost and environmental protection, and the catalyst can efficiently remove the organic dye in water under a wide range of sodium chloride concentration and reduce environmental pollution.
Description
Technical Field
The invention relates to the technical field of photocatalysis, and particularly discloses a G-C3N4The application of the catalyst in degrading organic dye in high-salt wastewater.
Background
The rapid development of the industry greatly promotes the improvement of human civilization, and simultaneously causes a series of environmental problems, such as organic pollutants in high-salt organic wastewater, which seriously threatens human health. Most of organic pollutants in the high-salt organic wastewater come from the fields of the process of production and living of seawater, industrial production and the like, the water quantity is increased year by year, and the organic pollutants in the high-salt organic wastewater are directly discharged into soil and water bodies to cause serious damage. Therefore, the treatment of organic pollutants in high-salt organic wastewater has become one of the major and hot problems in the research of the environmental protection field. There are many methods for treating organic pollutants in high-salt organic wastewater, but there are many problems, such as the removal of organic dyes by fenton or fenton-like technology under high-salt conditions, and the generation of halogen salts with higher toxicity. Therefore, timely research and development of methods for removing organic dyes in high-salinity wastewater have important practical significance and economic value for solving the environmental pollution problem caused by the organic dyes and recycling salt.
The photocatalytic oxidation technology has the advantages of mild reaction conditions, complete mineralization, environmental protection and the like, and is always favored by researchers. So far, the photocatalytic technology treats organic pollutants in high-salt wastewater, and the used photocatalyst is mainly a metal-based catalyst, for example, Chinese patent (201910510947.X) discloses a composite photocatalyst for treating rose bengal B in high-salt wastewater and a preparation method and application thereof, wherein the composite photocatalyst consists of silver phosphate, polyaniline and chromium-doped strontium titanate; chinese patent (201711046176.0) discloses porous graphite phase nitrogen carbide loaded bismuth oxycarbonate as a photocatalyst for treating organic dyes in high-salt wastewater. However, metal-based catalysts have a problem of secondary pollution; and because the chloride ions in the high-salt solution are adsorbed on the surface of the metal-based catalyst to form chlorine radical species, the chlorine radical species can be combined with the reactant to form hypochlorite with high toxicity. In addition, the chlorine radical species can be combined with photo-generated electrons to generate chlorine ions, and partial photo-generated hole-electron pairs are consumed, so that the photocatalytic performance of the metal-based catalyst is influenced. Compared with metal-based photocatalyst, the non-metal-based photocatalyst degrades high-salt stripsOrganic contaminants in the effluent are more attractive. The literature (appl.Catal.B: environ.2014,158-159:321-2SO3NaCl and Na2SO4) Graphite phase nitrogen carbide (molecular formula: g-C3N4) The research on the degradation of organic dyes by visible light shows that the sodium salts can promote the degradation of organic dyes in water under the visible light, but the reaction rate is slower. In addition, it is desirable to find out whether the catalyst can withstand the effects of higher sodium chloride concentrations for wider industrial applications. The literature (chem. Eng.J.2012,192:171-2The influence of the photocatalytic degradation of the organic dye AO7 shows that when the concentration of chloride ions is lower than 200mM, the chloride ions can enhance the performance of the photocatalyst; when the chloride ion concentration is higher than 200mM, the chloride ion exerts a significant inhibitory effect on the photocatalyst. Therefore, the concentration of sodium chloride is an important factor for restricting the development of the technology. In a word, the photocatalyst used in the prior art degrades organic dye in water under the condition of sodium chloride, and has the defects of easy secondary pollution, slow reaction rate, low sodium chloride concentration bearing capacity and the like. Therefore, it is necessary to develop a new method for efficiently degrading and treating organic dyes in high-salinity wastewater.
Disclosure of Invention
In view of the above, the present invention provides a G-C3N4The catalyst is applied to degrading the organic dye in the high-salt wastewater, has the advantages of simple use, low cost and environmental protection when being used for degrading the organic dye in the high-salt wastewater, and can efficiently remove the organic dye in water under the condition of a wide sodium chloride concentration range, thereby reducing the environmental pollution.
G-C provided by the invention3N4Application of catalyst in degradation of organic dye in high-salt wastewater, and G-C3N4The catalyst is a porous nanosheet structure catalyst prepared by the following method:
g to C3N4The precursor is roasted at the temperature of 550-600 ℃ for 2-4h to obtain g-C3N4A solid; then the saidg-C3N4The solid is hydrothermally treated at 160-3N4Powder; finally, the g-C is added3N4Placing the powder in a covered crucible, roasting at 500-550 ℃ for 2-8h, and rapidly cooling to obtain the G-C3N4A catalyst.
Preferably, said g-C3N4The mass ratio of the powder to the volume of the crucible is 0.10-0.14 g: 50 mL.
Preferably, said g-C3N4The precursor is melamine.
Preferably, said G-C is used3N4The specific process of degrading organic dye in high-salt wastewater by the catalyst is as follows: subjecting said G-C to3N4Adding the catalyst into high-salinity wastewater containing organic dye, violently stirring under a dark condition, balancing for 30min, and performing degradation treatment under a light condition.
More preferably, said G-C3N4The addition amount of the catalyst is 0.1-1.0 g/L.
More preferably, the organic dye is one of rhodamine B, methylene blue and methyl orange.
More preferably, the illumination is one of LED, Xe lamp, sunlight.
Compared with the prior art, the invention has the following beneficial technical effects:
1. the organic dye in the wastewater is efficiently removed under the condition of a wide sodium chloride concentration range, and no obvious inhibition effect exists;
2. the whole wastewater treatment process does not produce secondary pollution;
3. the used catalyst has the characteristics of simple preparation, environmental protection and low cost, and is easy to recover and can be repeatedly recycled.
Drawings
FIG. 1 is a Scanning Electron Microscope (SEM) image of the catalysts provided in example 1 and comparative example 1, wherein a is g-C3N4Electron micrographs, Panel b G-C3N4An electron microscope image;
FIG. 2 is a graph showing the removal rate of RhB in the organic dye treatment methods provided in example 1 and comparative example 1;
FIG. 3 is a graph of the removal rate of RhB at different NaCl concentrations as provided in example 4;
FIG. 4 is a graph of the removal of RhB at different dosages of the catalyst provided in example 5.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are only for the purpose of the present invention and are not intended to limit the scope of the present invention.
G-C provided by the invention3N4Application of catalyst in degradation of organic dye in high-salt wastewater, and G-C3N4The catalyst is a porous nanosheet structure catalyst prepared by the following method;
g to C3N4The precursor is roasted at the temperature of 550-600 ℃ for 2-4h to obtain g-C3N4A solid; then subjecting said g-C3N4The solid is hydrothermally treated at 160-3N4Powder; finally, the g-C is added3N4Placing the powder in a covered crucible, roasting at 500-550 ℃ for 2-8h, and rapidly cooling to obtain the G-C3N4A catalyst.
The following description will be given with reference to specific examples.
Example 1
At room temperature, 50mL of a mixed solution containing 10mg/L rhodamine B (labeled RhB) and 500mM NaCl is prepared, the mixed solution is placed into a photocatalytic reactor, and 1.0g/L G-C is added3N4Violently stirring for 30min under dark condition to ensure that reactants can reach adsorption-desorption balance on the surface of the catalyst under the condition of keeping out of the sun; then carrying out photocatalytic reaction under LED radiation, taking out reaction liquid at intervals, separating, measuring the absorbance of the reaction liquid, and calculating the RhB degradation rate;
wherein, G-C3N4The preparation process comprises the following steps:
putting precursor melamine into a covered crucible, and roasting the melamine 4 at 550 DEG Ch, to give g-C as pale yellow3N4Solid, grind for subsequent use, the crucible is capped to prevent the melamine from volatilizing due to sublimation; 0.3g of ground g-C is weighed3N4Putting the powder into a 50mL crystallization kettle, adding 25mL high-purity water, carrying out hydrothermal treatment at 180 ℃ for 4h, washing, drying and grinding to obtain sample powder; adding 0.10G of sample powder into a 50mL crucible with a cover, and roasting at 550 ℃ for 4h again to obtain the required catalyst, wherein the mark is G-C3N4。
In the above G-C3N4In the preparation process, the sample after the hydrothermal treatment is ground into sample powder, so that the sample under high-temperature roasting can be fully contacted with air. The purpose of the cover bake is to keep the sample from burning off completely. The ratio of the mass of the sample to the volume of the crucible is critical because in a crucible of a certain volume, the amount of the sample to be heated is too large to obtain the desired target catalyst, while the amount of the sample to be heated is too small to leave no sample.
The preparation principle is as follows: the melamine is roasted at high temperature to obtain g-C3N4Nanosheet, continued p-g-C3N4Subjecting the nanosheets to hydrothermal treatment to convert g-C3N4Partially stripping the nano sheets; second high temperature roasting can partially strip off the g-C3N4Further peeling was performed. While, part g-C3N4The nanosheets are decomposed into a gas, passing through g-C3N4The nanosheets form a large number of pores, thereby allowing g-C3N4Exhibits a porous nanosheet structure. Preparation of the resulting G-C3N4The electron micrograph of the catalyst is shown in FIG. 1, and FIG. 1(a) is g-C provided in comparative example 13N4FIG. 1(b) is an electron micrograph showing G-C provided in example 13N4Electron micrographs. g-C3N4Composed of particles of aggregated nanosheets, G-C3N4Exhibits a porous nanosheet structure. As can be seen from fig. 1, the structure of the finally prepared catalyst was greatly changed compared to the control catalyst.
Mixing the mixed solution of RhB and NaCl with the G-C3N4The degradation results of RhB after catalyst mixing are shown in fig. 2. As can be seen from FIG. 2, RhB is completely degraded within 30 min.
The principle of photodegradation reaction: under the action of light excitation, photogenerated hole-electron pairs are generated on the surface of the catalyst, wherein the photogenerated holes have oxidizing property and can be directly used for oxidizing organic dyes. In addition, the photo-generated electrons can combine with dissolved oxygen in water to generate peroxy radical species, which can also degrade organic dyes. In the presence of NaCl, Na+Is adsorbed on the catalyst surface and Cl-In a reaction solution such that photogenerated holes do not interact with Cl-The combination forms Cl species and further no more toxic hypochlorite.
Example 2
The only difference from example 1 is that:
in G-C3N4In the preparation process, 0.12G of sample powder subjected to hydrothermal treatment is added, and the mixture is roasted again for 4 hours at the temperature of 550 ℃ to prepare G-C3N4A catalyst.
Subjecting the G-C to3N4The catalyst and 50mL of mixed solution containing 10mg/L of RhB and 500mM NaCl are subjected to photocatalytic reaction for 30min, and the degradation rate of RhB reaches 99%.
Example 3
The difference from the above embodiment is only:
in G-C3N4In the preparation process, 0.14G of sample powder subjected to hydrothermal treatment is added, and the mixture is roasted again for 4 hours at the temperature of 550 ℃ to prepare G-C3N4A catalyst.
Subjecting the G-C to3N4The catalyst and 50mL of mixed solution containing 10mg/L of RhB and 500mM NaCl are subjected to photocatalytic reaction for 30min, and the degradation rate of RhB reaches 99%.
Example 4
Photodegradation of RhB in high-salinity wastewater under different concentrations of sodium chloride
At room temperature, 50mL of a mixed solution containing 10mg/L of RhB and NaCl at concentrations of 1mM, 10mM, 100mM, 300mM and 500mM, respectively, was prepared, placed in a photocatalytic reactor, and 1.0g/L G-C was added3N4(preparation method is the same as G-C in example 13N4Preparation method (1), vigorously stirring for 30min under dark conditions; then, a photocatalytic reaction was performed under LED irradiation, and the reaction solution was taken out at regular intervals, separated, measured for absorbance, and the RhB degradation rate was calculated, with the results shown in fig. 3.
As can be seen from FIG. 3, RhB was completely degraded within 30 min.
Example 5
Photodegradation of RhB in high-salinity wastewater under different catalyst adding amounts
At room temperature, 50mL of a mixed solution containing 10mg/L of RhB and 500mM NaCl was prepared, placed in a photocatalytic reactor, and G-C was added3N4Catalyst (preparation method same as G-C in example 1)3N4The preparation process of (1), wherein G-C3N4The adding amount of the catalyst is respectively 0.1g/L, 0.3g/L, 0.5g/L, 0.7g/L and 1.0g/L, and the mixture is vigorously stirred for 30min under the dark condition; then, a photocatalytic reaction was performed under LED irradiation, and the reaction solution was taken out at regular intervals, separated, measured for absorbance, and the RhB degradation rate was calculated, with the results shown in fig. 4.
As can be seen from FIG. 4, RhB was completely degraded within 30 min.
Comparative example 1
The differences from examples 1 to 3 are only:
the preparation process of the catalyst comprises the following steps:
adding precursor melamine into a covered crucible, and roasting the melamine for 4 hours at 550 ℃ to obtain light yellow g-C3N4And (5) solid grinding for later use.
The light yellow g-C3N4The solid was photocatalytically reacted with 50mL of a mixed solution containing 10mg/L of RhB and 500mM NaCl for 30min, and the results are shown in FIG. 2.
As can be seen from FIG. 2, within 30min, g-C3N4The upper RhB degradation rate is only 30%.
And g-C3N4Compared with G-C3N4The catalytic activity of (A) is remarkably improved, mainly due to the fact that the structure of the catalyst is greatly changedFor example, the topography is greatly changed, as shown in FIG. 1. The change of the shape leads the specific surface area of the material to be greatly increased, and further influences the capacity of the material for adsorbing RhB.
It should be noted that when the following claims refer to numerical ranges, it should be understood that both ends of each numerical range and any value between the two ends can be selected, and since the steps and methods used are the same as those of the embodiments, the preferred embodiments of the present invention have been described for the purpose of preventing redundancy, but once the basic inventive concept is known, those skilled in the art may make other variations and modifications to the embodiments. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be appreciated by persons skilled in the art that the above description is only a few specific embodiments of the invention, and that the invention is not limited thereto. It should be noted that many variations and modifications are possible to those skilled in the art, and all variations and modifications that do not depart from the gist of the invention are intended to be within the scope of the invention as defined in the appended claims.
Claims (7)
1.G-C3N4Application of catalyst in degradation of organic dye in high-salt wastewater, and G-C3N4The catalyst is a porous nanosheet structure catalyst prepared by the following method;
g to C3N4The precursor is roasted at the temperature of 550-600 ℃ for 2-4h to obtain g-C3N4A solid; then subjecting said g-C3N4The solid is hydrothermally treated at 160-3N4Powder; finally, the g-C is added3N4Placing the powder in a covered crucible, roasting at 500-550 ℃ for 2-8h, and rapidly cooling to obtain the G-C3N4A catalyst.
2. Use according to claim 1, wherein said g-C is3N4The ratio of the mass of the powder to the volume of the crucible is 0.10-0.14g：50mL。
3. Use according to claim 1, wherein said g-C is3N4The precursor is melamine.
4. Use according to claim 1, wherein said G-C is used3N4The specific process of degrading organic dye in high-salt wastewater by the catalyst is as follows: subjecting said G-C to3N4Adding the catalyst into high-salinity wastewater containing organic dye, violently stirring under a dark condition, balancing for 30min, and performing degradation treatment under a light condition.
5. Use according to claim 4, wherein said G-C is3N4The addition amount of the catalyst is 0.1-1.0 g/L.
6. The use according to claim 4, wherein the organic dye is one of rhodamine B, methylene blue, and methyl orange.
7. The use according to claim 4, wherein the illumination is one of LED, Xe lamp, sunlight.
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| CN112875791A (en) * | 2020-12-21 | 2021-06-01 | 中国科学技术大学 | Application of photocatalyst based on basic state oxygen atom leading in photocatalytic degradation of pollutants |
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| CN107684926A (en) * | 2017-10-31 | 2018-02-13 | 滨州学院 | Handle photochemical catalyst of dyestuff and preparation method thereof in high-salt wastewater |
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