Method for improving catalytic performance of iron-based amorphous alloy in degrading dye waste liquid

Abstract

The application discloses a method for improving the catalytic performance of iron-based amorphous alloy in degrading dye wastewater. The method is ultrasonic vibration treatment, which can change the performance of the material by applying standardized pulse energy. The application applies ultrasonic vibration treatment with a certain energy to iron-based amorphous alloy powder with different components to obtain amorphous powder for degrading dye wastewater. Compared with the original powder, the catalytic degradation performance of the amorphous alloy powder treated by ultrasonic vibration is significantly improved for different dyes. The method has the advantages of simple operation, short time consumption, low cost and high efficiency, and has a good application prospect in wastewater treatment. Moreover, the application obtains an optimal degradation scheme by adjusting various experimental parameters in the degradation process, such as ultrasonic energy and hydrogen peroxide concentration.

Description

Technical Field

[0001] This invention belongs to the field of materials processing and application technology, specifically relating to a processing method for rapidly improving the degradation efficiency of iron-based amorphous alloy materials and its application in the efficient degradation of dye wastewater. Background Technology

[0002] The rapid expansion of the dye industry has posed an increasingly serious threat to and damaged the aquatic environment upon which humanity depends. Dye wastewater presents problems including high color intensity, complex composition, and highly toxic pollutants. Furthermore, its difficulty in biochemical degradation makes it one of the most challenging and difficult-to-treat industrial wastewaters. This poses a serious threat to aquatic ecosystems, making it imperative to take effective measures to address this severe environmental problem.

[0003] Existing methods for treating dye wastewater include physical degradation methods (such as adsorption and ion exchange), biological degradation methods, and chemical degradation methods (such as zero-valent metal reduction, photocatalytic degradation, and Fenton oxidation). Physical methods require regeneration or treatment of the adsorbent after saturation; otherwise, secondary pollution may occur. For large-scale and high-concentration wastewater treatment, this method may not be sufficiently economical and efficient. Biological methods are greatly affected by environmental factors and microbial activity, and the rate may be slow; they may also be ineffective for some dyes with complex structures. Zero-valent metal reduction has a low reaction rate, and zero-valent metals are easily oxidized. Photodegradation requires specific wavelengths of light for some dyes, and the cost of photocatalysts is high. Fenton oxidation results in a large amount of ferric and ferrous ions in the final solution, which can easily cause secondary pollution. Each degradation method has its applicable scope and limitations; selecting a suitable method requires comprehensive consideration of the wastewater characteristics, economic feasibility, treatment effect, and potential environmental impact.

[0004] Amorphous alloys, with their long-range disorder, short-range order, and high-energy state, possess superior chemical and catalytic properties, making them more effective at promoting reactions than crystalline alloys. Furthermore, amorphous alloys offer a wider range of compositional design options compared to crystalline alloys. In addition, amorphous alloys lack defects such as grain boundaries and dislocations, as well as compositional fluctuations such as precipitates and segregation, resulting in superior corrosion resistance. Synthetic amorphous alloy powders have a large specific surface area, meaning more active catalytic sites available for dye molecule adsorption and reaction, increasing the contact opportunities between the catalyst and reactants, and thus improving reaction efficiency.

[0005] Compared with traditional zero-valent metal reduction methods, amorphous alloys significantly improve the degradation efficiency. However, under the sole action of amorphous alloys, extremely complex dye molecules (such as Rhodamine B) are difficult to degrade. Therefore, the degradation rate of dye wastewater by amorphous alloys still needs to be improved. Developing an efficient and widely applicable dye wastewater treatment technology is an urgent problem to be solved.

[0006] Chinese patent CN 107988568 A discloses an amorphous alloy strip, its preparation method, and its application in dye wastewater treatment. The method involves adding other elements (Cu, Si, B, Nb, V) to an iron-based amorphous alloy to prepare Fe... 73.5 Cu1B 13 Si 9.5 Nb3 and Fe 73.5 Cu1B 13 Si 9.5 Nb2V1 amorphous strips can effectively reduce iron corrosion during wastewater treatment. However, the amorphous alloy prepared by this patent still failed to completely degrade the dye solution after 75 minutes, indicating low degradation efficiency.

[0007] Chinese patent CN 114988551 A discloses a method for the efficient degradation of azo dyes using an ultrasonic-assisted iron-based amorphous coating. This invention achieves efficient degradation of dye wastewater under the action of applied ultrasound, thereby significantly improving wastewater treatment efficiency and recycling capacity. However, in this patent, the amount of iron-based amorphous coating used in the catalytic degradation process ranges from 2-32 g / L, the catalyst input is relatively high, and the degradation process involves multiple external devices, making the operation cumbersome.

[0008] Chinese patent CN 109434120 A discloses a method for preparing iron-based amorphous alloy powder for dye degradation. This invention utilizes ultrasonically treated amorphous powder for the degradation of dye wastewater. Ultrasonic treatment increases the number of reaction sites and the energy state of the amorphous powder, effectively improving the catalytic degradation performance of the catalyst. However, the iron-based amorphous powder in this patent has a single composition, low iron content, and requires a high amount of catalyst, resulting in catalytic performance that needs improvement. Furthermore, the pretreatment processes, such as ball milling, are complex. Summary of the Invention

[0009] In view of the problems of slow efficiency and complex preparation technology of the above-mentioned dye degradation catalysts for wastewater, the present invention aims to provide a method and application for improving the performance of iron-based amorphous alloy catalytic degradation of dye waste liquid.

[0010] Technical Solution: This invention relates to a method and application for improving the catalytic performance of iron-based amorphous alloys in degrading dye wastewater, utilizing Fe... a Cr b Si c B dIron-based amorphous alloy powder was subjected to ultrasonic vibration treatment. The ability of the iron-based amorphous alloy powder to degrade dye wastewater was improved by applying standardized pulse energy. Among them, 88≤a≤91, 0≤b≤3, 6≤c≤7, 2≤d≤3, a+b+c+d=100. The ultrasonic vibration treatment parameters used were: ultrasonic vibration energy of 500-3000J, trigger pressure of 22-1000N, amplitude of 50-100%, and working air pressure of 100-600Kpa.

[0011] As the most preferred option, the ultrasonic energy is 1250J.

[0012] Preferably, Fe a Cr b Si c B d For Fe 91 Si6B3 or Fe 89 Cr3Si6B2.

[0013] Preferably, Fe 91 Si6B3 or / and Fe 89 Cr3Si6B2 was prepared by liquid alloy atomization, and the resulting powder had a particle size of 2-15 μm.

[0014] On the other hand, the present invention provides a method for degrading dye wastewater, utilizing Fe a Cr b Si c B d The catalytic degradation of dye wastewater by amorphous powder includes the following steps:

[0015] (1) In a constant temperature water bath environment, add concentrated hydrogen peroxide to the dye solution and use dilute sulfuric acid to adjust the pH of the mixed solution to acidic;

[0016] (2) Fe treated with ultrasonic vibration a Cr b Si c B d The amorphous powder was added to the solution obtained in step (1), and mechanically stirred to ensure that the dye was in full contact with the Fe. a Cr b Si c B d Amorphous alloy powder enables uniform degradation of dye molecules.

[0017] Furthermore, in step (1), the constant temperature water bath temperature is 25-40℃, the dye solution concentration is 0.1g / L, and the hydrogen peroxide concentration is 2-6mmol / L.

[0018] Preferably, in step (1), the concentration of dilute sulfuric acid is 0.1-0.2 mol / L.

[0019] Preferably, in step (1), dilute sulfuric acid is used to adjust the pH of the mixed solution to 3-3.5.

[0020] Preferably, in step (2), the Fe a Cr b Si c B d The amount of amorphous powder used is 0.6 g / L.

[0021] Preferably, in step (2), the mechanical stirring speed is 380-450 r / min.

[0022] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: (1) Amorphous alloy powder has a larger specific surface area than amorphous alloy strips, which can provide more active catalytic sites for the adsorption and reaction of dye molecules. This characteristic significantly increases the contact opportunities between the catalyst and the reactants, thus having a significant beneficial effect on improving the reaction efficiency. Experimental verification shows that iron-based amorphous powder treated with ultrasonic vibration has improved the catalytic degradation ability of different dyes to varying degrees, and there is a certain regular relationship between ultrasonic vibration energy and catalytic degradation performance.

[0023] (2) The ultrasonic vibration treatment method used in this invention is simple to operate, short in time, low in cost and high in efficiency. Attached Figure Description

[0024] Figure 1 The images show the ultrasonic vibration processing of iron-based amorphous alloy powder in Examples 1 and 2.

[0025] Figure 2 Fe in Example 1 91 XRD patterns of Si6B3 amorphous powder before and after treatment with different ultrasonic vibration energies;

[0026] Figure 3 Fe in Example 1 91 SEM images of Si6B3 amorphous powder before and after treatment with 1250J ultrasonic vibration energy;

[0027] Figure 4 Fe under different ultrasonic energy conditions in Example 1 91 Curve showing the change in dye concentration with degradation time during the catalytic degradation of methylene blue by Si6B3 amorphous powder;

[0028] Figure 5 Fe in Example 2 89 XRD patterns of Cr3Si6B2 amorphous powder before and after treatment with different ultrasonic vibration energies;

[0029] Figure 6 Fe under different ultrasonic energy conditions in Example 2 89 Curve showing the change in dye concentration with degradation time during the catalytic degradation of methylene blue by Cr3Si6B2 amorphous powder;

[0030] Figure 7 Fe under different hydrogen peroxide concentrations in Example 3 91 Curve showing the change in dye concentration with degradation time during the catalytic degradation of methylene blue by Si6B3 raw powder;

[0031] Figure 8 Fe under different solution temperatures in Example 4 91 Curve showing the change in dye concentration with degradation time during the catalytic degradation of methylene blue using Si6B3-750J amorphous powder;

[0032] Figure 9 To compare Fe under different ultrasonic energy conditions in Example 5 91 The curve showing the change in dye concentration with degradation time during the catalytic degradation of Rhodamine B by Si6B3 amorphous powder. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0034] This invention provides a method for improving the catalytic performance of iron-based amorphous alloys in degrading dye wastewater, utilizing Fe... a Cr b Si c B d Iron-based amorphous alloy powder was subjected to ultrasonic vibration treatment. The ability of the iron-based amorphous alloy powder to degrade dye wastewater was improved by applying standardized pulse energy. Among them, 88≤a≤91, 0≤b≤3, 6≤c≤7, 2≤d≤3, a+b+c+d=100. The ultrasonic vibration treatment parameters used were: ultrasonic vibration energy of 500-3000J, trigger pressure of 22-1000N, amplitude of 50-100%, and working air pressure of 100-600Kpa.

[0035] In this embodiment of the invention, Fe a Cr b Si c B d For Fe 91 Si6B3 or Fe 89 Cr3Si6B2.

[0036] Table 1 XPS Measurement of Commercial Fe in Atmospheric Environment 91 Si6B3 and Fe 89 Cr3Si6B2 amorphous alloy powder composition table

[0037] Fe 33.96 52.39 Cr / 1.26 Si 36.27 36.50 B 29.77 9.85

[0038] This invention provides a method for degrading dye wastewater, utilizing Fe a Cr b Si c B d The catalytic degradation of dye wastewater by amorphous powder includes the following steps:

[0039] (1) In a constant temperature water bath environment, add 2-6 mM hydrogen peroxide to the 0.1 g / L dye solution and add 0.1-0.2 mol / L dilute sulfuric acid to adjust the pH of the mixed solution to 3-3.5.

[0040] (2) Fe treated with different ultrasonic vibration energies a Cr b Si c B d Amorphous powder was added to the solution obtained in step (1) at a dosage of 0.6 g / L, and mechanically stirred at a speed of 380-450 r / min to ensure that the dye was in full contact with the Fe. a Cr b Si c B d Amorphous powder enables uniform degradation of dye molecules.

[0041] Example 1

[0042] In this embodiment, Fe 91 Si6B3 iron-based amorphous alloy powder was treated with different ultrasonic vibration energies and then used to catalytically degrade a methylene blue dye solution with a concentration of 0.1 g / L.

[0043] I. Iron-based amorphous alloy powder Fe 91 Processing of Si6B3

[0044] Applying ultrasonic vibration treatment with different energies to iron-based amorphous alloy powder, such as... Figure 1 As shown, the ultrasonic vibration processing parameters were: applied energy of 500, 750, 1000, 1250, 2000, and 3000 J, trigger pressure of 300 N, amplitude of 100%, and working pressure of 400 kPa. The samples were denoted as Fe. 91 Si6B3 raw powder, Fe 91 Si6B3-500J, Fe 91 Si6B3-750J, Fe 91 Si6B3-1000J, Fe 91 Si6B3-1250J, Fe 91 Si6B3-2000J and Fe91 Si6B3-3000J.

[0045] X-ray diffraction tests were performed on amorphous powders with different energies, such as... Figure 2 As shown, Fe was confirmed. 91 Si6B3 raw powder, Fe 91 Si6B3-500J, Fe 91 Si6B3-750J is amorphous, confirming Fe... 91 Nanocrystals precipitated in Si6B3-1000J, confirming Fe... 91 Si6B3-1250J, Fe 91 Si6B3-2000J and Fe 91 Si6B3-3000J has a high degree of crystallinity.

[0046] Figure 3 Fe before degradation reaction 91 Scanning electron microscopy images of Si6B3 raw powder at 0J and 1250J ultrasonic vibration revealed that, compared to the smooth surface of the raw powder, the surface of the amorphous powder after ultrasonic vibration treatment produced a large number of cracks, further increasing the active sites of the catalyst and improving the catalytic degradation ability.

[0047] II. Utilizing iron-based amorphous alloy powder Fe 91 Si6B3 catalytically degrades methylene blue.

[0048] The iron-based amorphous alloy Fe obtained above 91 150 mg of Si6B3 was placed in a beaker containing 250 mL of a 0.1 g / L aqueous solution of methylene blue dye. The pH of the solution was adjusted to approximately 3. The beaker was placed in a constant temperature water bath, and the solution temperature was maintained at 25°C. Then, 3.5 mmol / L hydrogen peroxide was added. The solution was mixed thoroughly at 450 rpm to ensure complete contact and catalytic degradation. During the reaction, approximately 3.5 mL of the solution sample was drawn using a 5 mL syringe after each 2–5 min reaction. The sample was filtered through a disposable filter membrane with a 0.22 μm pore size and placed in a cuvette. The cuvette was then placed in a UVmini-1280 UV / Vis spectrophotometer for absorbance measurement to obtain the UV absorption spectrum.

[0049] Comparative Example 1

[0050] Comparative Example 1 is a comparative example to Example 1 described above. In this comparative example, the test methods used in Comparative Example 1 and Example 1 are kept exactly the same. The amorphous powder used in Comparative Example 1 is Fe. 91 Si6B3 raw powder, Fe 91The ultraviolet absorption spectrum of methylene blue catalytic degradation by Si6B3 raw powder is shown. The catalytic degradation performance of the raw powder and the ultrasonically treated amorphous powder is compared.

[0051] It can be seen that the absorbance at the maximum absorption peak in the visible light region is proportional to the solution concentration, allowing for comparison of the methylene blue concentration C in the solution at different times t. t With the initial dye concentration C0, a pseudo-first-order kinetic model C t =C0exp(-kt) describes the catalytic degradation process of amorphous alloys.

[0052] Figure 4 Fe under different ultrasonic energy conditions 91 C obtained by degrading methylene blue with Si6B3 amorphous powder t The curve shows the relationship between / C0 and time. As can be seen from the figure, compared to the original powder sample, the amorphous powder treated with ultrasonic vibration completely degraded the dye within 20 minutes, and the catalytic degradation ability was improved to varying degrees. Furthermore, the samples treated with ultrasonication at 1250 and 2000 J had the shortest degradation time and the best performance.

[0053] Example 2

[0054] In this Example 2, Fe is used. 89 Cr3Si6B2 iron-based amorphous alloy powder was treated with different ultrasonic vibration energies and then used for the catalytic degradation of a 0.1 g / L methylene blue dye solution. The ultrasonic vibration energy treatment method was the same as in Example 1.

[0055] The iron-based amorphous alloy powder used in Example 2 has the molecular formula Fe. 89 Cr3Si6B2, keeping the ultrasonic vibration treatment parameters exactly the same as in Example 2 and Example 1, yielded Fe in different energy states. 89 Cr3Si6B2 powder, denoted as Fe 89 Cr3Si6B2 raw powder, Fe 89 Cr3Si6B2-500J, Fe 89 Cr3Si6B2-750J, Fe 89 Cr3Si6B2-1000J, Fe 89 Cr3Si6B2-1250J, Fe 89 Cr3Si6B2-2000J and Fe 89 Cr3Si6B2-3000J; The test method in Example 2 was kept exactly the same as that in Example 1, and Fe was obtained under different ultrasonic energy conditions. 89 Ultraviolet absorption spectrum of methylene blue catalytic degradation by Cr3Si6B2 amorphous powder.

[0056] Comparative Example 2

[0057] Comparative Example 2 is a comparative example of Example 2 described above. In this comparative example, the test conditions were kept the same as those in Comparative Example 2 and Example 2, but the amorphous alloy powder used in the comparative example was Fe. 89 Cr3Si6B2 raw powder, yielding Fe 89 UV absorption spectrum of Cr3Si6B2 raw powder catalytically degrading methylene blue. (Comparison with Fe) 89 Catalytic degradation performance of raw Cr3Si6B2 powder and ultrasonically treated amorphous powder.

[0058] Fe at different ultrasonic energies 89 X-ray diffraction testing was performed on Cr3Si6B2 iron-based amorphous alloy powder, such as... Figure 5 As shown, Fe was confirmed. 89 Cr3Si6B2 raw powder, Fe 89 Cr3Si6B2-500J is amorphous, confirming Fe 89 Cr3Si6B2-750J, Fe 89 Cr3Si6B2-1000J precipitates nanocrystals, Fe 89 Cr3Si6B2-1250J, Fe 89 Cr3Si6B2-2000J and Fe 89 Cr3Si6B2-3000J has a high degree of crystallinity.

[0059] It can be seen that the absorbance at the maximum absorption peak in the visible light region is proportional to the solution concentration, allowing for comparison of the methylene blue concentration C in the solution at different times t. t With the initial dye concentration C0, a pseudo-first-order kinetic model C t =C0exp(-kt) describes the catalytic degradation process of amorphous alloys.

[0060] Figure 6 Fe under different ultrasonic energy conditions 89 C obtained by degrading methylene blue with Cr3Si6B2 amorphous powder t The curve shows the relationship between / C0 and time. As can be seen from the figure, compared to the original powder sample, the amorphous powder treated with ultrasonic vibration completely degraded the dye within 30 minutes, and the catalytic degradation ability was improved to varying degrees. Furthermore, the sample treated with 1250J ultrasound had the shortest degradation time and the best performance.

[0061] Comparing Examples 1 and 2, it was found that ultrasonic vibration treatment improved the catalytic degradation ability of different iron-based amorphous alloy systems to varying degrees. Compared to Fe... 89 Cr3Si6B2,Fe 91Si6B3 amorphous alloy exhibits superior catalytic degradation performance, making it the preferred component in this patent.

[0062] Example 3

[0063] Example 3 investigated the effect of hydrogen peroxide concentration in solution on Fe. 91 The effect of Si6B3 amorphous powder on the catalytic degradation of methylene blue.

[0064] Use Fe 91 The Si6B3 raw powder was used to catalytically degrade methylene blue, and the steps are as follows:

[0065] Take Fe 91 150 mg of raw Si6B3 powder was placed in separate beakers containing 250 mL of a 0.1 g / L methylene blue dye aqueous solution. The pH of the solution was adjusted to approximately 3. The beakers were placed in a constant temperature water bath, maintaining the solution temperature at 25°C. Then, 3.5, 4.5, and 5.5 mmol / L hydrogen peroxide were added, and the solutions were mixed thoroughly at 450 rpm to ensure complete contact and catalytic degradation. During the reaction, approximately 3.5 mL of the solution sample was drawn using a 5 mL syringe after each 2–5 min reaction. The sample was filtered through a disposable 0.22 μm filter membrane and placed in a cuvette. The cuvette was then placed in a UVmini-1280 UV / Vis spectrophotometer for absorbance measurement, yielding the UV absorption spectrum.

[0066] Comparative Example 3

[0067] Comparative Example 3 is a comparative example of Example 3 described above. The powder composition used in Comparative Example 3 is exactly the same as that described in Example 3, and the degradation test method is exactly the same as that described in Example 3. However, the hydrogen peroxide concentration of the dye solution in Comparative Example 3 is 2.5 mmol / L.

[0068] Figure 7 The figure shows Fe 91 C obtained by catalytic degradation of methylene blue from Si6B3 raw powder under different hydrogen peroxide contents t The curve shows the relationship between CO and time. As can be seen from the figure, the hydrogen peroxide concentration in this invention affects Fe... 91 The degradation ability of Si6B3 amorphous powder is crucial; the degradation rate of amorphous alloy powder is fastest when the hydrogen peroxide concentration is 3.5 mmol / L.

[0069] Example 4

[0070] Example 4 investigated the effect of solution temperature on Fe. 91 The effect of Si6B3 amorphous powder on the catalytic degradation of methylene blue.

[0071] Use Fe91 The catalytic degradation of methylene blue using Si6B3-750J amorphous powder is carried out through the following steps:

[0072] Take Fe 91 150 mg of Si6B3-750J amorphous powder was placed in separate beakers containing 250 mL of a 0.1 g / L aqueous solution of methylene blue dye. The pH of the solution was adjusted to approximately 3. The beakers were placed in a constant temperature water bath, and the solution temperature was maintained at 30℃, 35℃, and 40℃. Then, 3.5 mmol / L hydrogen peroxide was added, and the solutions were mixed thoroughly at 450 rpm to ensure complete contact and catalytic degradation. During the reaction, approximately 3.5 mL of the solution sample was drawn using a 5 mL syringe after each 2–5 min reaction. The sample was filtered through a disposable filter membrane with a 0.22 μm pore size and placed in a cuvette. The cuvette was then placed in a UVmini-1280 UV / Vis spectrophotometer for absorbance measurement to obtain the UV absorption spectrum.

[0073] Comparative Example 4

[0074] Comparative Example 4 is a comparative example of Example 4 described above. The powder composition used in Comparative Example 4 is exactly the same as that described in Example 4, and the degradation test method is exactly the same as that described in Example 4. However, Comparative Example 4 involves the degradation of methylene blue solution using the original amorphous powder at room temperature (25°C) and a water bath temperature.

[0075] Figure 8 The figure shows Fe 91 C obtained by catalytic degradation of methylene blue from Si6B3-750J amorphous powder at different water bath temperatures t The curve showing the relationship between / C0 and time. As can be seen from the figure, Fe in this invention... 91 The ability of Si6B3-750J amorphous powder to degrade methylene blue increases significantly with increasing temperature; moreover, when the solution temperature is 40℃, Fe... 91 Si6B3-750J amorphous powder has achieved a high degradation capacity, approaching that of Fe. 91 The degradation rate of Si6B3-1250J. Therefore, it can be seen that the energy requirement in this invention is relatively small, effectively reducing energy loss.

[0076] Example 5

[0077] In this embodiment, Fe 91 Si6B3 iron-based amorphous alloy powder was treated with different ultrasonic vibration energies and then used for the catalytic degradation of a 0.1 g / L Rhodamine B dye solution. The ultrasonic vibration energy treatment method was the same as in Example 1.

[0078] Fe treated with different ultrasonic energies91 The catalytic degradation of Rhodamine B using Si6B3 amorphous powder is carried out in the following steps:

[0079] The iron-based amorphous alloy Fe obtained above 91 150 mg of Si6B3 was placed in a beaker containing 250 mL of a 0.1 g / L Rhodamine B dye aqueous solution. 0.1 mol / L dilute sulfuric acid was added dropwise to adjust the pH to approximately 3. The beaker was placed in a constant temperature water bath, maintaining the solution temperature at 25°C. Then, 5 mmol / L hydrogen peroxide was added, and the solution was mixed thoroughly at 450 rpm to ensure complete contact and catalytic degradation. During the reaction, approximately 3.5 mL of the solution sample was drawn using a 5 mL syringe after each 1–5 min reaction. The sample was filtered through a disposable 0.22 μm filter membrane and placed in a cuvette. The cuvette was then placed in a UVmini-1280 UV / Vis spectrophotometer for absorbance measurement, yielding the UV absorption spectrum.

[0080] Comparative Example 5

[0081] Comparative Example 5 is a comparative example to Example 5 described above. In this comparative example, the experimental parameters were kept the same as those in Comparative Example 5 and Example 5, but the amorphous powder used in the comparative example was Fe. 91 Si6B3 raw powder, Fe 91 UV absorption spectra of Rhodamine B catalytic degradation by Si6B3 raw powder. The catalytic degradation efficiency is compared between the raw powder and the ultrasonically treated amorphous powder.

[0082] Based on the direct proportionality between the absorbance of the maximum absorption peak in the visible light region and the solution concentration, a pseudo-first-order kinetic model C can be used. t =C0exp(-kt) describes the catalytic degradation process of amorphous alloys, where C t Let t be the concentration of Rhodamine B in the solution at time t, C0 be the initial dye concentration, and k be the reaction rate constant.

[0083] Figure 9 Fe after ultrasonic treatment at different energies 91 C obtained by degrading Rhodamine B with Si6B3 amorphous powder t The curve showing the relationship between CO and time indicates that the catalytic degradation ability is significantly improved compared to the original powder sample. When ultrasonic energy exceeding 1000J is applied to the amorphous powder, the dye can be completely degraded within 10 minutes. The catalytic degradation performance reaches its optimal level when the ultrasonic energy is 1250J or 2000J.

Claims

1. A method for improving the catalytic performance of iron-based amorphous alloys in degrading dye wastewater, characterized in that, Using the molecular formula Fe 91 Si6B3 or Fe 89 Iron-based amorphous alloy powder of Cr3Si6B2 was subjected to ultrasonic vibration treatment. The ability of the iron-based amorphous alloy powder to degrade dye wastewater was improved by applying standardized pulse energy. Among them, Fe... 91 The ultrasonic vibration treatment parameters for Si6B3 iron-based amorphous alloy powder are as follows: ultrasonic vibration energy of 1250 or 2000 J, triggering pressure of 22-1000 N, amplitude of 50-100%, and working air pressure of 100-600 kPa; Fe 89 The ultrasonic vibration treatment parameters used for Cr3Si6B2 iron-based amorphous alloy powder are as follows: ultrasonic vibration energy of 1250 J, trigger pressure of 22-1000 N, amplitude of 50-100%, and working air pressure of 100-600 kPa.

2. The method for improving the catalytic performance of iron-based amorphous alloys in degrading dye wastewater according to claim 1, characterized in that, Fe 91 Si6B3 or / and Fe 89 Cr3Si6B2 was prepared by liquid alloy atomization, and the resulting powder had a particle size of 2-15 μm.

3. A method for degrading dye wastewater, characterized in that, Use Fe a Cr b Si c B d The catalytic degradation of dye wastewater by amorphous powder includes the following steps: (1) In a constant temperature water bath environment, add concentrated hydrogen peroxide to the dye solution and adjust the pH of the mixed solution to acidic using dilute sulfuric acid; (2) Fe treated with ultrasonic vibration a Cr b Si c B d The amorphous powder was added to the solution obtained in step (1), and mechanically stirred to ensure that the dye was in full contact with the Fe. a Cr b Si c B d Amorphous alloy powder enables uniform degradation of dye molecules; among which, Fe a Cr b Si c B d For Fe 91 Si6B3 or Fe 89 Cr3Si6B2,Fe 91 The ultrasonic vibration treatment parameters for Si6B3 iron-based amorphous alloy powder are as follows: ultrasonic vibration energy of 1250 or 2000 J, triggering pressure of 22-1000 N, amplitude of 50-100%, and working air pressure of 100-600 kPa; Fe 89 The ultrasonic vibration treatment parameters used for Cr3Si6B2 iron-based amorphous alloy powder are as follows: ultrasonic vibration energy of 1250 J, trigger pressure of 22-1000 N, amplitude of 50-100%, and working air pressure of 100-600 kPa.

4. The method for degrading dye wastewater according to claim 3, characterized in that, In step (1), the constant temperature water bath temperature is 25-40℃, the dye solution concentration is 0.1g / L, and the hydrogen peroxide concentration is 2~6mmol / L.

5. The method for degrading dye waste liquid according to claim 3, characterized in that, In step (1), the concentration of dilute sulfuric acid is 0.1-0.2 mol / L.

6. The method for degrading dye waste liquid according to claim 3, characterized in that, In step (1), the pH of the mixed solution is adjusted to 3-3.5 using dilute sulfuric acid.

7. The method for degrading dye wastewater according to claim 3, characterized in that, In step (2), the Fe a Cr b Si c B d The amount of amorphous powder used is 0.6 g / L.

8. The method for degrading dye waste liquid according to claim 3, characterized in that, In step (2), the mechanical stirring speed is 380-450 r / min.

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