CN113600177B - Holmium tungstate sodium nano water treatment catalyst and preparation method thereof - Google Patents
Holmium tungstate sodium nano water treatment catalyst and preparation method thereof Download PDFInfo
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- 239000003054 catalyst Substances 0.000 title claims abstract description 67
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 229910052689 Holmium Inorganic materials 0.000 title claims abstract description 19
- KJZYNXUDTRRSPN-UHFFFAOYSA-N holmium atom Chemical compound [Ho] KJZYNXUDTRRSPN-UHFFFAOYSA-N 0.000 title claims abstract description 19
- PBYZMCDFOULPGH-UHFFFAOYSA-N tungstate Chemical compound [O-][W]([O-])(=O)=O PBYZMCDFOULPGH-UHFFFAOYSA-N 0.000 title claims abstract description 19
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 title claims abstract description 17
- 229910052708 sodium Inorganic materials 0.000 title claims abstract description 17
- 239000011734 sodium Substances 0.000 title claims abstract description 17
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 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 abstract description 19
- 229940012189 methyl orange Drugs 0.000 claims abstract description 19
- BTJIUGUIPKRLHP-UHFFFAOYSA-N 4-nitrophenol Chemical compound OC1=CC=C([N+]([O-])=O)C=C1 BTJIUGUIPKRLHP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 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 claims abstract description 16
- 229960000907 methylthioninium chloride Drugs 0.000 claims abstract description 16
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 54
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 35
- 239000000243 solution Substances 0.000 claims description 32
- PYOOBRULIYNHJR-UHFFFAOYSA-K trichloroholmium Chemical compound Cl[Ho](Cl)Cl PYOOBRULIYNHJR-UHFFFAOYSA-K 0.000 claims description 31
- 238000006243 chemical reaction Methods 0.000 claims description 28
- 239000011780 sodium chloride Substances 0.000 claims description 27
- 239000008367 deionised water Substances 0.000 claims description 20
- 229910021641 deionized water Inorganic materials 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 20
- 239000011259 mixed solution Substances 0.000 claims description 17
- 230000029087 digestion Effects 0.000 claims description 15
- 238000001027 hydrothermal synthesis Methods 0.000 claims description 12
- YASYEJJMZJALEJ-UHFFFAOYSA-N Citric acid monohydrate Chemical compound O.OC(=O)CC(O)(C(O)=O)CC(O)=O YASYEJJMZJALEJ-UHFFFAOYSA-N 0.000 claims description 11
- 229960002303 citric acid monohydrate Drugs 0.000 claims description 11
- -1 polytetrafluoroethylene Polymers 0.000 claims description 11
- 238000001035 drying Methods 0.000 claims description 10
- 239000011521 glass Substances 0.000 claims description 10
- 230000010355 oscillation Effects 0.000 claims description 10
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 10
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 10
- 239000002957 persistent organic pollutant Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 239000010935 stainless steel Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- 239000003403 water pollutant Substances 0.000 abstract description 2
- 230000008929 regeneration Effects 0.000 abstract 1
- 238000011069 regeneration method Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 16
- 239000000463 material Substances 0.000 description 11
- 230000003197 catalytic effect Effects 0.000 description 8
- 239000000975 dye Substances 0.000 description 8
- 229910000033 sodium borohydride Inorganic materials 0.000 description 7
- 239000012279 sodium borohydride Substances 0.000 description 7
- 238000011156 evaluation Methods 0.000 description 6
- 239000002351 wastewater Substances 0.000 description 4
- 238000005303 weighing Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000003911 water pollution Methods 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000010170 biological method Methods 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 231100000086 high toxicity Toxicity 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 231100000219 mutagenic Toxicity 0.000 description 1
- 230000003505 mutagenic effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000029553 photosynthesis Effects 0.000 description 1
- 238000010672 photosynthesis Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- XMVONEAAOPAGAO-UHFFFAOYSA-N sodium tungstate Chemical compound [Na+].[Na+].[O-][W]([O-])(=O)=O XMVONEAAOPAGAO-UHFFFAOYSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 231100000378 teratogenic Toxicity 0.000 description 1
- 230000003390 teratogenic effect Effects 0.000 description 1
- CMPGARWFYBADJI-UHFFFAOYSA-L tungstic acid Chemical compound O[W](O)(=O)=O CMPGARWFYBADJI-UHFFFAOYSA-L 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/24—Chromium, molybdenum or tungsten
- B01J23/30—Tungsten
-
- 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
- C02F1/70—Treatment of water, waste water, or sewage by reduction
-
- 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
- C02F2101/34—Organic compounds containing oxygen
- C02F2101/345—Phenols
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Catalysts (AREA)
Abstract
The invention discloses a holmium tungstate sodium nano water treatment catalyst and a preparation method thereof. The catalyst disclosed by the invention is environment-friendly, low in cost, capable of efficiently catalyzing and reducing water pollutants such as p-nitrophenol, methyl orange, methylene blue and the like, long in service life, simple in regeneration and the like, and has wide market application prospect.
Description
Technical Field
The invention provides a holmium tungstate sodium nano water treatment catalyst and a preparation method thereof, belonging to the fields of environmental protection catalysis and water pollution treatment.
Background
P-nitrophenol, methyl orange, methylene blue and the like are taken as common dyes, 10-20 percent of the dyes are discharged into a water environment in the using process, and the wastewater containing the dyes of p-nitrophenol, methyl orange, methylene blue and the like has high toxicity and contains carcinogenic, mutagenic and teratogenic substances; high color, inhibition of photosynthesis in plants in aquatic systems: the COD value is high, which can lead to eutrophication of the water body. Based on the above hazards, the wastewater containing dyes such as p-nitrophenol, methyl orange, methylene blue and the like is a difficult problem facing the current water treatment technology and needing treatment urgently. Common treatment methods include adsorption method, membrane separation method, common oxidation method, biological method and the like, but the methods have the defects of complex process flow, high equipment requirement, high cost, damage to microenvironment and the like. The catalytic reduction method is a method capable of thoroughly solving water body pollution and even changing waste into valuable, p-nitrophenol, methyl orange and methylene blue are thoroughly reduced into chemical products by using sodium borohydride, and catalytic materials can be recycled and reused, so that the catalytic materials cannot remain in wastewater to cause secondary pollution to the environment. However, waste water containing dyes such as p-nitrophenol, methyl orange, methylene blue, etc. is generally alkaline and has a large change in pH. In the existing catalytic treatment method, most catalytic materials can degrade more than 90% of dyes only under acidic conditions. Therefore, the development of novel catalytic materials with strong pH adaptability and high-efficiency degradation effect on dyes such as methyl orange, p-nitrophenol, methylene blue and the like is paid more attention by the majority of researchers, and the utilization of the catalytic materials for treating the dyes such as methyl orange, p-nitrophenol, methylene blue and the like has important significance.
Disclosure of Invention
The invention aims to provide a holmium tungstate nano water treatment catalyst for improving the defects of the prior art, and the invention also aims to provide a preparation method of the water treatment catalyst.
The purpose of the invention can be realized by the following technical scheme:
a catalyst for treating sodium holmium tungstate nano water is prepared by taking ammonium metatungstate, citric acid monohydrate, holmium chloride, sodium chloride and deionized water as raw materials and utilizing a supercritical hydrothermal synthesis method; wherein, ammonium metatungstate: holmium chloride: the mass ratio of the sodium chloride is 8.485: 5.278: 1.
the preparation method of the water treatment catalyst comprises the following steps:
(1) preparation of ammonium metatungstate complex solution
Placing ammonium metatungstate, citric acid monohydrate and deionized water in a cylindrical open glass bottle, and uniformly dissolving the ammonium metatungstate, citric acid monohydrate and deionized water by ultrasonic oscillation to form an ammonium metatungstate complex solution for later use;
(2) preparing a mixed solution of holmium chloride and sodium chloride
Mixing holmium chloride, sodium chloride and deionized water, uniformly dissolving the holmium chloride, the sodium chloride and the deionized water by ultrasonic oscillation to form a mixed solution of the holmium chloride and the sodium chloride, and placing the mixed solution into a polytetrafluoroethylene digestion tank for later use;
(3) supercritical hydrothermal synthesis
And (3) placing the open glass bottle filled with the ammonium metatungstate complex solution in the step (1) into the polytetrafluoroethylene digestion tank in the step (2), simultaneously ensuring that the mixed solution of holmium chloride and sodium chloride does not physically contact with the ammonium metatungstate complex solution, sealing the digestion tank into a stainless steel reaction kettle, placing the reaction kettle into an oven for hydrothermal reaction, cooling after the reaction is finished, taking out the reaction kettle, and filtering and drying the obtained catalyst to obtain the holmium tungstate sodium nano water treatment catalyst.
The method comprises the following steps: the hydrothermal reaction temperature in the step (3) is 150-180 ℃, and the reaction time is 2-4 h.
The method comprises the following steps: in the step (3), the drying temperature is 80 ℃, and the drying time is 8-12 h.
The method comprises the following steps: step (1), ammonium metatungstate: citric acid monohydrate: the mass ratio of the deionized water is 1: (1-3): 5, the mass ratio of holmium chloride to deionized water in the step (2) is 1: 5 to 15.
In the technical scheme of the invention, the holmium tungstate sodium nano water treatment catalyst is applied to the aspect of removing organic pollutants in water as the catalyst.
And further: the organic pollutants are methyl orange, p-nitrophenol and methylene blue.
The technical scheme of the invention is as follows: the application of the holmium tungstate sodium nano water treatment catalyst in the aspect of removing organic pollutants in water as the catalyst.
The technical scheme of the invention is as follows: the organic pollutants are methyl orange, p-nitrophenol and methylene blue.
The catalytic reaction conditions and results of the invention: a small sample of 1mL of catalyst was loaded into a catalyst performance evaluation reaction apparatus, and the reaction solution was added to evaluate the activity. The concentration of each solution was: 20mL of methyl orange (100mg/L, if necessary), 20mL of p-nitrophenol (139mg/L, if necessary), 20mL of methylene blue (100mg/L, if necessary), and 20mL of sodium borohydride (3.78 g/L). The catalyst can remove methyl orange, p-nitrophenol and methylene blue within 1h under normal temperature (25 ℃) and normal pressure, and the catalyst can still maintain 100% of efficiency after being used for ten times.
Has the advantages that:
the catalyst prepared by the invention can efficiently catalyze and reduce water pollutants such as p-nitrophenol, methyl orange, methylene blue and the like. Compared with the prior art, the tungstic acid in the catalyst system has strong solid acidity, and the activity of the catalyst can be improved; holmium and sodium have abundant surface hydroxyl groups, and can promote the adsorption and activation of reaction molecules on the surface of the catalyst, thereby improving the performance of the catalyst. Therefore, the holmium tungstate sodium catalyst prepared by the supercritical hydrothermal synthesis method is environment-friendly in components, simple in preparation process, low in cost, high in cost performance, excellent in catalytic conversion rate, capable of thoroughly and effectively solving the problem of water pollution, and has social and economic benefits such as environmental protection and the like, and wide market application prospect.
Detailed Description
The invention is further illustrated by the following examples, without limiting the scope of the invention:
example 1
(1) Preparation of ammonium metatungstate complex solution
Weighing 8.485g of ammonium metatungstate, 8.485g of citric acid monohydrate and 42.425g of deionized water, placing the weighed materials in a 50mL cylindrical open glass bottle, and uniformly dissolving the materials by ultrasonic oscillation to form an ammonium metatungstate complex solution for later use;
(2) preparing a mixed solution of holmium chloride and sodium chloride
5.278g of holmium chloride, 1g of sodium chloride and 52.78g of deionized water are weighed and placed in a 200mL polytetrafluoroethylene digestion tank, and the components are uniformly dissolved by ultrasonic oscillation to form a mixed solution of the holmium chloride and the sodium chloride for later use;
(3) supercritical hydrothermal synthesis
And (2) placing the open glass bottle filled with the ammonium metatungstate complex solution in the step (1) into a polytetrafluoroethylene digestion tank in the step (2), simultaneously ensuring that the mixed solution of holmium chloride and sodium chloride is not in physical contact with the ammonium metatungstate complex solution, sealing the digestion tank into a stainless steel reaction kettle, placing the reaction kettle into an oven, keeping the temperature for 2h at 150 ℃, cooling, taking out, filtering the obtained catalyst, and drying at 80 ℃ for 8h to obtain the holmium tungstate sodium nano water treatment catalyst.
(4) Catalyst Activity test
A small sample of 1mL of catalyst was loaded into a catalyst performance evaluation reaction apparatus, and the reaction solution was added to evaluate the activity. The concentration of each solution was: 20mL of methyl orange (100mg/L), 20mL of sodium borohydride (3.78 g/L). The catalyst has the efficiency of removing methyl orange for 60min reaching 100 percent at normal temperature (25 ℃) and normal pressure, and the catalyst can still maintain the efficiency of 100 percent after being used for ten times.
Example 2:
(1) preparation of ammonium metatungstate complex solution
Weighing 8.485g of ammonium metatungstate, 25.455g of citric acid monohydrate and 42.425g of deionized water, placing the weighed materials in a 50mL cylindrical open glass bottle, and uniformly dissolving the materials by ultrasonic oscillation to form an ammonium metatungstate complex solution for later use;
(2) preparing a mixed solution of holmium chloride and sodium chloride
5.278g of holmium chloride, 1g of sodium chloride and 52.78g of deionized water are weighed and placed in a 200mL polytetrafluoroethylene digestion tank, and are uniformly dissolved by ultrasonic oscillation to form a mixed solution of holmium chloride and sodium chloride for later use;
(3) supercritical hydrothermal synthesis
And (2) placing the open glass bottle filled with the ammonium metatungstate complex solution in the step (1) into the polytetrafluoroethylene digestion tank in the step (2), simultaneously ensuring that the mixed solution of holmium chloride and sodium chloride is not in physical contact with the ammonium metatungstate complex solution, sealing the digestion tank into a stainless steel reaction kettle, placing the reaction kettle into an oven, keeping the temperature of 180 ℃ for 4 hours, cooling, taking out, filtering the obtained catalyst, and drying at 80 ℃ for 12 hours to obtain the holmium tungstate sodium nano water treatment catalyst.
(4) Catalyst Activity test
A small sample of 1mL of catalyst was loaded into a catalyst performance evaluation reaction apparatus, and the reaction solution was added to evaluate the activity. The concentration of each solution was: 20mL of p-nitrophenol (139mg/L), and 20mL of sodium borohydride (3.78 g/L). The p-nitrophenol removal efficiency of the catalyst reaches 100% at normal temperature (25 ℃) and normal pressure within 60min, and the catalyst can still maintain 100% after being used for ten times.
Example 3
(1) Preparation of ammonium metatungstate complex solution
Weighing 8.485g of ammonium metatungstate, 20.000g of citric acid monohydrate and 42.425g of deionized water, placing the weighed materials in a 50mL cylindrical open glass bottle, and uniformly dissolving the materials by ultrasonic oscillation to form an ammonium metatungstate complex solution for later use;
(2) preparing a mixed solution of holmium chloride and sodium chloride
5.278g of holmium chloride, 1g of sodium chloride and 52.78g of deionized water are weighed and placed in a 200mL polytetrafluoroethylene digestion tank, and are uniformly dissolved by ultrasonic oscillation to form a mixed solution of holmium chloride and sodium chloride for later use;
(3) supercritical hydrothermal synthesis
And (2) placing the open glass bottle filled with the ammonium metatungstate complex solution in the step (1) into the polytetrafluoroethylene digestion tank in the step (2), simultaneously ensuring that the mixed solution of holmium chloride and sodium chloride is not in physical contact with the ammonium metatungstate complex solution, sealing the digestion tank into a stainless steel reaction kettle, placing the reaction kettle into an oven, keeping the temperature for 4 hours at 150 ℃, cooling, taking out, filtering the obtained catalyst, and drying for 10 hours at 80 ℃ to obtain the holmium tungstate sodium nano water treatment catalyst.
(4) Catalyst Activity test
A small sample of 1mL of catalyst was loaded into a catalyst performance evaluation reaction apparatus, and the reaction solution was added to evaluate the activity. The concentration of each solution was: 20mL of methylene blue (100mg/L), and 20mL of sodium borohydride (3.78 g/L). The efficiency of the catalyst for removing methylene blue in 60min reaches 100% at normal temperature (25 ℃) and normal pressure, and the efficiency of the catalyst can still maintain 100% after being used for ten times.
Comparative example 1
(1) Catalyst preparation
The same conditions as in example 1 were used except that 4.243g of ammonium metatungstate was used for the catalyst preparation;
(2) catalyst Activity test
A small sample of 1mL of catalyst was loaded into a catalyst performance evaluation reaction apparatus, and the reaction solution was added to evaluate the activity. The concentration of each solution was: 20mL of methyl orange (100mg/L), 20mL of sodium borohydride (3.78 g/L). The catalyst has the efficiency of removing methyl orange only 45% in 60min and the efficiency of removing methyl orange only 73% in 120min at normal temperature (25 ℃) and normal pressure.
(3) Contrast effect
In comparison to example 1, the ammonium metatungstate: holmium chloride: the proportion of sodium chloride is changed, and the holmium tungstate sodium cannot be generated, so that the catalytic efficiency is obviously reduced.
Comparative example 2
(1) Catalyst preparation
The conditions were the same as in example 2 except that holmium chloride was not used for the catalyst preparation;
(2) catalyst Activity test
A small sample of 1mL of catalyst was loaded into a catalyst performance evaluation reaction apparatus, and the reaction solution was added to evaluate the activity. The concentration of each solution was: 20mL of p-nitrophenol (139mg/L), and 20mL of sodium borohydride (3.78 g/L). The catalyst has the p-nitrophenol removal efficiency of only 41 percent at normal temperature (25 ℃) and normal pressure for 60 min.
(3) Contrast effect
Compared with the example 2, when the catalyst is prepared, holmium chloride is not used, sodium tungstate is mainly generated, and the effect is obviously lower than that of the holmium tungstate.
Claims (7)
1. A holmium tungstate sodium nano water treatment catalyst is characterized in that: ammonium metatungstate, citric acid monohydrate, holmium chloride, sodium chloride and deionized water are used as raw materials, and a supercritical hydrothermal synthesis method is utilized to prepare a holmium tungstate sodium catalyst; wherein, ammonium metatungstate: holmium chloride: the mass ratio of the sodium chloride is 8.485: 5.278: 1.
2. a method for preparing the water treatment catalyst according to claim 1, characterized in that: the catalyst is prepared by the following method:
(1) preparation of ammonium metatungstate complex solution
Placing ammonium metatungstate, citric acid monohydrate and deionized water in a cylindrical open glass bottle, and uniformly dissolving the ammonium metatungstate, citric acid monohydrate and deionized water by ultrasonic oscillation to form an ammonium metatungstate complex solution for later use;
(2) preparing a mixed solution of holmium chloride and sodium chloride
Mixing holmium chloride, sodium chloride and deionized water, uniformly dissolving the holmium chloride, the sodium chloride and the deionized water by ultrasonic oscillation to form a mixed solution of the holmium chloride and the sodium chloride, and placing the mixed solution into a polytetrafluoroethylene digestion tank for later use;
(3) supercritical hydrothermal synthesis
And (2) placing the open glass bottle filled with the ammonium metatungstate complex solution in the step (1) into the polytetrafluoroethylene digestion tank in the step (2), simultaneously ensuring that the mixed solution of holmium chloride and sodium chloride is not in physical contact with the ammonium metatungstate complex solution, sealing the digestion tank into a stainless steel reaction kettle, placing the reaction kettle into a drying oven for hydrothermal reaction, cooling after the reaction is finished, taking out the reaction kettle, and filtering and drying the obtained catalyst to obtain the holmium tungstate sodium nano water treatment catalyst.
3. The method of claim 2, wherein: the hydrothermal reaction temperature in the step (3) is 150-180 ℃, and the reaction time is 2-4 h.
4. The method of claim 2, wherein: in the step (3), the drying temperature is 80 ℃, and the drying time is 8-12 h.
5. The method of claim 2, wherein: step (1), ammonium metatungstate: citric acid monohydrate: the mass ratio of the deionized water is 1: (1-3): 5, the mass ratio of holmium chloride to deionized water in the step (2) is 1: 5 to 15.
6. The application of the holmium tungstate sodium nano-water treatment catalyst as recited in claim 1 in removing organic pollutants in water as a catalyst.
7. Use according to claim 6, characterized in that: the organic pollutants are methyl orange, p-nitrophenol and methylene blue.
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