CN115536123A - Method for Fenton catalytic degradation of methylene blue sewage by FeBCCr amorphous alloy - Google Patents
Method for Fenton catalytic degradation of methylene blue sewage by FeBCCr amorphous alloy Download PDFInfo
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- RBTBFTRPCNLSDE-UHFFFAOYSA-N 3,7-bis(dimethylamino)phenothiazin-5-ium Chemical compound C1=CC(N(C)C)=CC2=[S+]C3=CC(N(C)C)=CC=C3N=C21 RBTBFTRPCNLSDE-UHFFFAOYSA-N 0.000 title claims abstract description 87
- 229960000907 methylthioninium chloride Drugs 0.000 title claims abstract description 87
- 238000006731 degradation reaction Methods 0.000 title claims abstract description 75
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
-
- 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
-
- 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
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- 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
- C02F2305/02—Specific form of oxidant
- C02F2305/026—Fenton's reagent
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
Abstract
The invention provides a method for Fenton catalytic degradation of methylene blue sewage by FeBCCr amorphous alloy, which comprises the following steps: adjusting the pH value of the methylene blue sewage to be acidic, adding a hydrogen peroxide solution and a FeBCCr amorphous alloy strip into the methylene blue sewage, carrying out stirring degradation reaction, and degrading the methylene blue in the dye sewage based on Fenton-like reaction; the chemical formula of the FeBCCr amorphous alloy is (Fe) a B b C c ) 100‑d Cr d The corresponding content of the elements a, b, c and d is atomic percent, wherein a =79-82, b =9-11, c =8-10, d =1-2, a + b + c =100. The method can completely degrade the methylene blue dye within 13 minutes. The invention has low production cost, simple process and very fast degradation rate, and is applied to the treatment of dye wastewaterHas good application prospect.
Description
Technical Field
The invention relates to a method for Fenton catalytic degradation of methylene blue sewage by FeBCCr amorphous alloy, belonging to the field of metal materials.
Background
With the rapid development of economy, azo dyes produced in the textile industry and the like are one of the most important water pollution sources. There are three main methods for treating azo dyes in aqueous solutions: biological treatment, adsorption and metal degradation. The metal degradation method shows significant advantages in purifying azo dye solutions. In addition, it has been found that the amorphous alloy powder shows superiority in degradation of azo dye solution and can maintain high degradation efficiency in various complicated environments, and the amorphous iron powder has 200 times faster degradation efficiency on azo dye reduction than general zero-valent iron powder.
However, the amorphous alloy system with high degradation efficiency can be prepared only by chemical, atomization, annealing or mechanical alloying methods. Among them, the annealing method requires a pre-formed amorphous ribbon, the atomization method requires a strong glass forming ability, the chemical method easily causes strong contamination, and the Mechanical Alloying (MA) method is economical but has a low amorphization efficiency. Therefore, the cost of the amorphous powder is high, and the wide application of the amorphous powder in sewage treatment is influenced.
The degradation mechanism of the dye is characterized by generating hydroxyl free radicals (OH) with strong oxidation capacity, and under the reaction conditions of high temperature and high pressure, electricity, sound, light irradiation, catalysts and the like, macromolecular refractory organic matters are oxidized into low-toxicity or non-toxic micromolecular substances. Depending on the manner of generating radicals and the reaction conditions, they can be classified into photochemical oxidation, catalytic wet oxidation, sonochemical oxidation, ozone oxidation, electrochemical oxidation, fenton oxidation, and the like. Wherein, the Fenton-like method directly utilizes zero-valent iron and hydrogen peroxide to form an oxidation system, thereby realizing the secondary utilization of the material. Compared with the traditional Fenton method, the Fenton-like method has the advantages that the dosage of hydrogen peroxide is less, and the applicable pH range is wider. However, the use of scrap iron as an iron source has problems of low reaction rate and low decolorization rate.
The atomic arrangement of the amorphous alloy material is different from that of the crystal alloy, the amorphous alloy material is in short-range order and long-range disorder, the characteristic of the amorphous alloy material is endowed with unique performance, and the iron-based amorphous alloy as a functional material for sewage treatment is a popular research direction in recent years.
Chinese patent document CN103880149A provides a method for degrading dye sewage by an iron-based amorphous/dioxygen water fenton system, wherein the amorphous component is femosi. However, the price of metal Mo is expensive, the cost is high, when 1g of amorphous hydrogen peroxide with the mass fraction of 20-30% is added into 100ml of dye solution by using the system, the methylene blue solution is reduced to 80% of the original concentration within 10 minutes, the degradation time is long, and in the degradation process, a reaction product is easy to cover zero-valent iron, so that the catalyst is passivated, and the degradation is hindered.
Chinese patent document CN108525688A provides an application of an iron-based amorphous alloy for degrading methylene blue in dye wastewater, wherein the iron-based amorphous component is Fe 80 P 13 C 7 The given optimal degradation time is also more than 5 minutes; and the alloy contains more P element, which may cause secondary pollution to the solution.
Chinese patent document CN110237854A provides a method for degrading methylene blue sewage by fenton catalysis of a FeBC amorphous alloy, which comprises adding a FeBC amorphous alloy strip into dye sewage, and degrading methylene blue in the dye sewage based on fenton-like reaction, wherein the FeBC amorphous alloy consists of iron, boron and carbon elements, and the atomic percentages of the elements in the alloy are as follows: boron is more than or equal to 6 percent and less than or equal to 13 percent, carbon is more than or equal to 5 percent and less than or equal to 10 percent, and iron is more than or equal to 80 percent and less than or equal to 84 percent. Chinese patent document CN111747508A provides a method for catalytic degradation of methylene blue dye by amorphous alloy fenton, which is characterized in that iron-based amorphous alloy is added into a solution containing methylene blue dye, and methylene blue in the solution is degraded based on fenton-like reaction; the molecular formula composition of the iron-based amorphous alloy meets the following requirements: fe a P b B c C d Cu e The atomic percent a of Fe is more than or equal to 60 and less than or equal to 87, the atomic percent b of P is more than or equal to 5 and less than or equal to 12, the atomic percent c of B is more than or equal to 1 and less than or equal to 8, the atomic percent d of C is more than or equal to 4 and less than or equal to 12, the atomic percent e of Cu is more than or equal to 0 and less than or equal to 1.5, and a + b + c + d + e =100. The above method is compared withThe hydroxyl generated by Fenton-like reaction of zero-valent iron has higher reaction speed and higher repeatability, but can not meet the requirement at all in actual production, and in the actual use process of the patent, oxides generated by degradation can be attached to the surface of an amorphous matrix to form a layer of compact oxide film, so that the contact between dye sewage and active sites on the surface of amorphous alloy is blocked, the degradation rate is gradually slowed down in the reaction process, and finally, a strip is completely covered by the compact oxide film, the degradation reaction can not be continued, and the waste of materials is caused.
Therefore, the method for degrading the dye sewage, which has the advantages of higher reaction speed, less iron ion dissolution and incapability of generating an oxide film to cover the surface of a strip so as to ensure that the reaction can be continuously and efficiently carried out, has important significance.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for Fenton catalytic degradation of methylene blue sewage by using FeBCCr amorphous alloy. The method has the advantages of high degradation speed and less iron ion dissolution, and can ensure that the degradation reaction is continuously and efficiently carried out.
The technical scheme of the invention is as follows:
a method for Fenton catalytic degradation of methylene blue sewage by FeBCCr amorphous alloy comprises the following steps:
and adjusting the pH value of the methylene blue sewage to be acidic, adding a hydrogen peroxide solution and a FeBCCr amorphous alloy strip into the methylene blue sewage, stirring and degrading the methylene blue in the dye sewage based on the Fenton-like reaction.
According to the invention, the concentration of the methylene blue sewage is preferably 20-50mg/L, and more preferably 30mg/L.
According to the invention, the pH value of the methylene blue sewage is preferably adjusted to 3-5, and the pH value of the methylene blue sewage is more preferably adjusted to 3.
According to the invention, the pH value of the methylene blue sewage is preferably adjusted by using an acid solution, wherein the acid solution is a dilute sulfuric acid solution with the mass fraction of 15-20%.
According to the invention, the mass fraction of the hydrogen peroxide solution is 30%, and the ratio of the added volume of the hydrogen peroxide solution to the mass of methylene blue in the methylene blue sewage is 0.3-0.4 mL.
According to the invention, the chemical formula of the FeBCCr amorphous alloy is (Fe) a B b C c ) 100-d Cr d The corresponding content of the elements a, b, c and d is atomic percent, wherein a =79-82, b =9-11, c =8-10, d =1-2, a + b + c =100; further preferably, said a =81, b =10, c =9, d =2.
According to the invention, the FeBCCr amorphous alloy strip is prepared into an amorphous strip by utilizing a smelting melt-spinning process, and is cut into a non-wafer for use, and the size and the shape of the FeBCCr amorphous alloy strip are not particularly limited.
According to the invention, the mass ratio of the FeBCCr amorphous alloy strip to the methylene blue in the methylene blue sewage is preferably 0.005-0.02g.
According to the present invention, a preferred embodiment comprises the steps of:
(1) Adding a dilute sulfuric acid solution into the methylene blue sewage to adjust the pH value of the sewage to 3-5;
(2) Adding hydrogen peroxide solution and FeBCCr amorphous alloy strips into methylene blue sewage, and stirring and degrading by using a magnetic stirrer; the chemical formula of the FeBCCr amorphous alloy is (Fe) a B b C c ) 100-d Cr d The corresponding content of the elements a, b, c and d is atomic percent, wherein a =79-82, b =9-11, c =8-10, d =1-2, a + b + c =100; the mass ratio of the FeBCCr amorphous alloy strip to methylene blue in the methylene blue sewage is 0.005-0.02g; the mass fraction of the hydrogen peroxide solution is 30%, and the ratio of the added volume of the hydrogen peroxide solution to the mass of methylene blue in the methylene blue sewage is 0.3-0.4 mL.
According to the invention, the degradation reaction time is within 13 minutes, and the degradation removal of the methylene blue in the dye sewage can be completed.
The degradation reaction can be quickly finished at room temperature (25 +/-5 ℃), and the reaction speed is accelerated along with the temperature rise. After the treatment is finished, the magnetic stirring rotor and the amorphous strip can be taken out, cleaned and dried for repeated use.
The invention has the following technical characteristics and beneficial effects:
1. the invention obtains a process for degrading methylene blue dye solution with low cost and high efficiency by reasonably selecting an amorphous system and reasonably proportioning sulfuric acid and hydrogen peroxide. Compared with a FePC system, the amorphous strip of the FeBCCr system catalytically degrades methylene blue solution, and the content of P which can cause secondary pollution is reduced; compared with the traditional FeBC amorphous system, the FeBCCr system has higher degradation efficiency, meanwhile, the addition of Cr improves the corrosion resistance of the amorphous alloy, reduces the dissolution of iron ions, simultaneously, an oxide film formed in the degradation process is not easy to cover strip surface active sites, ensures that the degradation process can be continuously and efficiently carried out, and is easy to operate and realize industrialization.
2. Experiments prove that for methylene blue dye sewage with the concentration of 30mg/L, the invention uses the FeBCCr amorphous alloy strip with the mass 0.05 per mill less than that of the dye sewage, so that the methylene blue can be basically degraded and removed within 13 minutes, and the degradation rate is high.
Drawings
FIG. 1 shows (Fe) in example 1 81 B 10 C 9 ) 99 Cr 1 Example 2 (Fe) 81 B 10 C 9 ) 98 Cr 2 Comparative example 1 Fe 81 B 10 C 9 Comparative example 2 (Fe) 81 B 10 C 9 ) 97 Cr 3 Comparative example 3 (Fe) 81 B 10 C 9 ) 99 Al 1 Comparative example 4 (Fe) 81 B 10 C 9 ) 99 Mn 1 Degradation of amorphous bands the concentration of methylene blue solution normalized with time is plotted with the abscissa as time.
FIG. 2 shows (Fe) in the test example 81 B 10 C 9 ) 98 Cr 2 ，Fe 81 B 10 C 9 ，(Fe 81 B 10 C 9 ) 97 Cr 3 Repeatedly degrading methylene blue solution with amorphous stripGraph of reaction rate constant change with the abscissa being cycle number.
Detailed Description
The present invention is further illustrated by, but not limited to, the following specific examples.
The experimental methods described in the examples are all conventional methods unless otherwise specified; the reagents and materials used, unless otherwise indicated, are commercially available.
The mass fraction of the dilute sulfuric acid solution used in the examples was 16.4%.
Example 1
A method for Fenton catalytic degradation of methylene blue sewage by FeBCCr amorphous alloy comprises the following steps:
under the condition of 25 ℃, taking 200mL of 30mg/L methylene blue solution, adjusting the pH value to 3 by using dilute sulfuric acid, adding 0.3mL of hydrogen peroxide solution with the mass fraction of 30%, magnetically stirring for 1.5min, sucking 3mL of solution by using a soft rubber dropper, and performing photometric analysis in an ultraviolet spectrophotometer; 0.01g of (Fe) 81 B 10 C 9 ) 99 Cr 1 Adding the amorphous strip into the stirred methylene blue solution, magnetically stirring for degradation reaction, and sampling with a soft rubber dropper for photometric analysis when reacting for 1min,4min,7min,10min and 13min.
The results of the analysis are shown in FIG. 1, and it can be seen from FIG. 1 that the dye has been substantially removed by the time the reaction has proceeded for 13 min.
Example 2
A method for Fenton catalytic degradation of methylene blue sewage by FeBCCr amorphous alloy comprises the following steps:
under the condition of 25 ℃, taking 200mL of 30mg/L methylene blue solution, adjusting the pH value to 3 by using dilute sulfuric acid, adding 0.3mL of hydrogen peroxide solution with the mass fraction of 30%, magnetically stirring for 1.5min, sucking 3mL of solution by using a soft rubber dropper, and performing photometric analysis in an ultraviolet spectrophotometer; 0.01g of (Fe) 81 B 10 C 9 ) 98 Cr 2 Adding the amorphous strip into the stirred methylene blue solution, magnetically stirring for degradation reaction, and sampling with a soft rubber dropper when the reaction is carried out for 1min,4min,7min and 10minPhotometric analysis was performed. A
The results of the analysis are shown in FIG. 1, and it can be seen from FIG. 1 that the dye has been substantially removed when the reaction is carried out for 10 min.
Comparative example 1
A method for degrading methylene blue sewage by FeBC amorphous alloy Fenton catalysis comprises the following steps:
under the condition of 25 ℃, taking 200mL of 30mg/L methylene blue solution, adjusting the pH value to 3 by using dilute sulfuric acid, adding 0.3mL of hydrogen peroxide solution with the mass fraction of 30%, magnetically stirring for 1.5min, sucking 3mL of solution by using a soft rubber dropper, and performing photometric analysis in an ultraviolet spectrophotometer; 0.01g of Fe 81 B 10 C 9 Adding the amorphous strip into the stirred methylene blue solution, performing degradation reaction, and sampling with a soft rubber dropper for photometric analysis when the degradation is carried out for 1min,4min,7min,10min,13min and 111min.
The analysis results are shown in FIG. 1, and it can be seen from FIG. 1 that the dye was substantially removed when the reaction proceeded for 16min, indicating that the degradation rate was lower than that of the FeBCCr amorphous ribbon.
Comparative example 2
A method for Fenton catalytic degradation of methylene blue sewage by FeBCCr amorphous alloy comprises the following steps:
under the condition of 25 ℃, taking 200mL of 30mg/L methylene blue solution, adjusting the pH value to 3 by using dilute sulfuric acid, adding 0.3mL of hydrogen peroxide solution with the mass fraction of 30%, magnetically stirring for 1.5min, sucking 3mL of solution by using a soft rubber dropper, and performing photometric analysis in an ultraviolet spectrophotometer; 0.01g of (Fe) 81 B 10 C 9 ) 97 Cr 3 And (3) adding the amorphous band into a stirred methylene blue solution for degradation reaction, and sampling by using a soft rubber dropper for photometric analysis when degradation is carried out for 1min,4min,7min,10min,13min and 111min.
The results of the analysis are shown in FIG. 1, and it can be seen from FIG. 1 that the dye has been substantially removed by the time the reaction proceeded for 16 min.
Comparative example 3
A method for Fenton catalytic degradation of methylene blue sewage by FeBCAl amorphous alloy comprises the following steps:
under the condition of 25 ℃, taking 200mL of 30mg/L methylene blue solution, adjusting the pH value to 3 by using dilute sulfuric acid, adding 0.3mL of hydrogen peroxide solution with the mass fraction of 30%, magnetically stirring for 1.5min, and absorbing 3mL of solution by using a soft rubber dropper to perform photometric analysis in an ultraviolet spectrophotometer; 0.01g of (Fe) 81 B 10 C 9 ) 99 Al 1 Adding the amorphous strip into the stirred methylene blue solution, performing degradation reaction, and sampling by using a soft rubber dropper for photometric analysis when the amorphous strip is degraded for 1min,4min,7min,10min,13min and 111min.
The results of the analysis are shown in FIG. 1, and it can be seen from FIG. 1 that the dye has been substantially removed by the time the reaction proceeded for 16 min.
Comparative example 4
A method for Fenton catalytic degradation of methylene blue sewage by FeBCMn amorphous alloy comprises the following steps:
under the condition of 25 ℃, taking 200mL of 30mg/L methylene blue solution, adjusting the pH value to 3 by using dilute sulfuric acid, adding 0.3mL of hydrogen peroxide solution with the mass fraction of 30%, magnetically stirring for 1.5min, sucking 3mL of solution by using a soft rubber dropper, and performing photometric analysis in an ultraviolet spectrophotometer; 0.01g of (Fe) 81 B 10 C 9 ) 99 Mn 1 Adding the amorphous strip into the stirred methylene blue solution, performing degradation reaction, and sampling with a soft rubber dropper for photometric analysis when the degradation is carried out for 1min,4min,7min,10min,13min and 111min.
The results of the analysis are shown in FIG. 1, and it can be seen from FIG. 1 that the dye has been substantially removed by the time the reaction proceeded for 16 min.
Test examples
To (Fe) 81 B 10 C 9 ) 98 Cr 2 、Fe 81 B 10 C 9 、(Fe 81 B 10 C 9 ) 97 Cr 3 And carrying out repeated degradation experiments on the amorphous alloy.
The method comprises the following specific steps:
at the temperature of 25 ℃, 200mL of 30mg/L methylene blue solution is taken, the pH value is adjusted to 3 by dilute sulphuric acid, and the solution is added with the mass fraction of0.3mL of a 30% hydrogen peroxide solution was magnetically stirred for 1.5min, and then 0.1g of (Fe) 81 B 10 C 9 ) 98 Cr 2 And adding the amorphous strip into the stirred methylene blue solution, sampling once every two minutes in the degradation process to perform photometric analysis, taking out the strip after the degradation is finished, and repeating the degradation process until the strip cannot degrade the dye.
While Fe was tested according to the above method 81 B 10 C 9 、(Fe 81 B 10 C 9 ) 97 Cr 3 The repeated degradation performance of the amorphous alloy.
Change of reaction rate constant k during its repeated degradation T As shown in FIG. 2, during repeated degradation (Fe) 81 B 10 C 9 ) 98 Cr 2 The amorphous strip always keeps a higher degradation rate, and oxides on the surface of the strip are easy to fall off in the degradation process, so that the matrix can be prevented from being blocked by oxidation products and contacted with a solution for degradation; fe in repeated degradation process 81 B 10 C 9 Although the amorphous thin strip can be repeatedly degraded for many times, the reaction rate is obviously reduced because the reaction product covers the surface of the strip in the degradation process; during repeated degradation (Fe) 81 B 10 C 9 ) 97 Cr 3 Although the amorphous strip can be repeatedly degraded for many times, because the corrosion resistance of the strip is excellent, the iron ion leaching is less, and the reaction speed is obviously reduced.
In conclusion, the degradation rate of the FeBC strip is improved to a certain extent after different metal elements are added, wherein the degradation rate of the strip after Cr is added is improved to a greater extent than that of other strips, 1% and 2% of the addition amount of chromium can obviously enhance the degradation capability of the strip, but the 2% of the addition amount is improved most obviously, but the excessive addition can cause the performance deterioration of the FeBC strip, and compared with other strips, the FeBC strip can also maintain a continuous and efficient degradation.
Claims (9)
1. A method for Fenton catalytic degradation of methylene blue sewage by FeBCCr amorphous alloy comprises the following steps:
and adjusting the pH value of the methylene blue sewage to be acidic, adding a hydrogen peroxide solution and a FeBCCr amorphous alloy strip into the methylene blue sewage, carrying out stirring degradation reaction, and degrading the methylene blue in the dye sewage based on the Fenton-like reaction.
2. The method for Fenton catalytic degradation of methylene blue sewage by using the FeBCCr amorphous alloy according to claim 1, wherein the concentration of the methylene blue sewage is 20-50mg/L, preferably 30mg/L.
3. The method for Fenton catalytic degradation of methylene blue sewage by using FeBCCr amorphous alloy according to claim 1, wherein the pH value of the methylene blue sewage is adjusted to 3-5, preferably the pH value of the methylene blue sewage is adjusted to 3.
4. The method for Fenton catalytic degradation of methylene blue sewage by FeBCCr amorphous alloys according to claim 1, wherein the pH value of the methylene blue sewage is adjusted by using an acid solution, and the acid solution is a dilute sulfuric acid solution with a mass fraction of 15-20%.
5. The method for Fenton catalytic degradation of methylene blue sewage by using the FeBCCr amorphous alloy according to claim 1, wherein the mass fraction of the hydrogen peroxide solution is 30%, and the ratio of the addition volume of the hydrogen peroxide solution to the mass of methylene blue in the methylene blue sewage is 0.3-0.4 mL.
6. The method for Fenton catalytic degradation of methylene blue sewage by using the FeBCCr amorphous alloy according to claim 1, wherein the chemical formula of the FeBCCr amorphous alloy is (Fe) a B b C c ) 100-d Cr d The corresponding contents of the elements a, b, c and d are atomic percent, wherein a =79-82, b =9-11, c =8-10, d =1-2, a + b + c =100.
7. The method for Fenton catalytic degradation of methylene blue sewage by using the FeBCCr amorphous alloy according to claim 6, wherein a =81, b =10, c =9, d =2.
8. The method for Fenton catalytic degradation of methylene blue sewage by using the FeBCCr amorphous alloy according to claim 1, wherein the mass ratio of the FeBCCr amorphous alloy strip to the methylene blue in the methylene blue sewage is 0.005-0.02g.
9. The method for Fenton catalytic degradation of methylene blue sewage by the FeBCCr amorphous alloy according to claim 1, which is characterized by comprising the following steps:
(1) Adding a dilute sulfuric acid solution into the methylene blue sewage to adjust the pH value of the sewage to 3-5;
(2) Adding hydrogen peroxide solution and FeBCCr amorphous alloy strips into methylene blue sewage, and stirring and degrading by using a magnetic stirrer;
the chemical formula of the FeBCCr amorphous alloy is (Fe) a B b C c ) 100-d Cr d The corresponding contents a, b, c and d of the elements are atomic percent, wherein a =79-82, b =9-11, c =8-10, d =1-2, a + b + c =100;
the mass ratio of the FeBCCr amorphous alloy strip to methylene blue in the methylene blue sewage is 0.005-0.02g;
the mass fraction of the hydrogen peroxide solution is 30%, and the ratio of the addition volume of the hydrogen peroxide solution to the mass of the methylene blue in the methylene blue sewage is 0.3-0.4mL.
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