A Fe, Cu co-doped Bi8La 10 O 27 Adsorbent material, method for its preparation and use in the removal of organic dyes

Abstract

This invention relates to an Fe, Cu co-doped Bi8La 10 O 27 This research relates to adsorbent materials, their preparation methods, and their applications in the removal of organic dyes, belonging to the fields of environmental functional materials and water treatment technology. In an acidic system, a complexation-gel conversion strategy is employed to improve the adsorption of Bi... 3+ La 3+ Fe 3+ and Cu 2+ A homogeneous precursor system is formed, and Fe and Cu are achieved in Bi8La after heat treatment. 10 O 27 Co-doping in the crystal lattice yields Fe and Cu co-doped Bi8La with highly efficient adsorption properties. 10 O 27 Adsorption material. The obtained material has a high specific surface area and abundant surface active sites, exhibiting excellent adsorption performance for methylene blue at room temperature, achieving a removal efficiency of over 94% within 15 minutes. The results indicate that this material possesses high adsorption efficiency, good structural stability, and wide application range, making it suitable for the efficient treatment of low-concentration organic dye wastewater.

Description

Technical Field

[0001] This invention belongs to the field of environmental functional materials and water treatment technology, specifically relating to a Fe / Cu co-doped Bi8La. 10 O 27 Adsorption materials, their preparation methods, and their applications in the removal of organic dyes. Background Technology

[0002] With the development of the printing and dyeing industry and related industries, the problem of wastewater discharge containing organic dyes has become increasingly prominent. Methylene blue, as a typical cationic dye, is characterized by its stable structure and difficulty in degradation, and it easily causes persistent pollution in water bodies.

[0003] Currently, the main methods for treating organic dye wastewater include photocatalytic degradation, membrane separation, and biological treatment. However, these methods generally suffer from problems such as complex equipment, high operating costs, or limited treatment efficiency in practical applications. In contrast, adsorption methods have attracted widespread attention due to their ease of operation and wide applicability.

[0004] In recent years, perovskite-based composite oxide materials have shown potential application value in the field of adsorption due to their high structural stability and strong tunability. However, traditional single-component materials generally suffer from limited active sites and insufficient adsorption capacity. In addition, existing research mainly focuses on single-metal doping, while studies on multi-metal synergistic doping to regulate adsorption performance are still relatively few.

[0005] Therefore, developing a multi-metal doped oxide material with stable structure, abundant active sites, and high adsorption performance is of great significance for improving the treatment efficiency of organic dye wastewater. Summary of the Invention

[0006] This invention aims to provide a Fe, Cu co-doped Bi8La 10 O 27 Adsorbent materials, their preparation methods, and their applications in the removal of organic dyes are investigated to address the limited adsorption efficiency of existing adsorbent materials.

[0007] The technical solution adopted in this invention is: a Bi8La co-doped with Fe and Cu. 10 O 27 Adsorbent materials, in acidic systems, utilize a complexation-gel transformation strategy to enable Bi... 3+ La 3+ Fe 3+ and Cu 2+ A homogeneous precursor system is formed, and Fe and Cu are achieved in Bi8La after heat treatment. 10 O 27 Co-doping in the crystal lattice yields Fe and Cu co-doped Bi8La with highly efficient adsorption properties. 10 O27 Adsorbent materials.

[0008] The above-mentioned Fe and Cu co-doped Bi8La 10 O 27 The preparation method of the adsorbent material includes the following steps.

[0009] 1) Add lanthanum nitrate, bismuth nitrate, ferric nitrate and copper nitrate to an aqueous nitric acid solution, stir until completely dissolved, add citric acid monohydrate, and continue stirring to form a homogeneous complex solution.

[0010] 2) After heating and stirring, a viscous gel is formed. The gel is dried to obtain a solid, which is then ground, calcined, cooled, ground again, washed, and dried to obtain Fe and Cu co-doped Bi8La. 10 O 27 Adsorbent materials.

[0011] The above-mentioned Fe and Cu co-doped Bi8La 10 O 27 The preparation method of the adsorbent material, with a molar ratio of lanthanum nitrate: bismuth nitrate: ferric nitrate: copper nitrate: citric acid monohydrate = 1:0.8-0.9:0.05-0.1:0.05-0.1:2.

[0012] The above-mentioned Fe and Cu co-doped Bi8La 10 O 27 In the preparation method of the adsorbent material, step 2) involves heating and stirring at 80 °C.

[0013] The above-mentioned Fe and Cu co-doped Bi8La 10 O 27 In the preparation method of the adsorbent material, step 2) involves calcination at 600-800 ℃ for 3 h.

[0014] The above Fe and Cu co-doped Bi8La 10 O 27 The application of adsorbent materials in the removal of organic dyes, specifically the Fe and Cu co-doped Bi8La. 10 O 27 The adsorbent material is added to the organic dye solution and adsorption is carried out under stirring conditions.

[0015] The above-mentioned Fe and Cu co-doped Bi8La 10 O 27 The application of adsorbent materials in the removal of organic dyes, wherein the organic dye is methylene blue.

[0016] The above-mentioned Fe and Cu co-doped Bi8La 10 O 27The application of adsorbent materials in the removal of organic dyes, wherein the adsorption process is carried out at room temperature and the stirring speed is 300-800 r / min.

[0017] The above-mentioned Fe and Cu co-doped Bi8La 10 O 27 The application of adsorption materials in the removal of organic dyes, with an initial concentration of organic pollutants of 10... -6 -10 -4 mol / L, adsorption time not exceeding 20 min.

[0018] The above-mentioned Fe and Cu co-doped Bi8La 10 O 27 Application of adsorbent materials in the removal of organic dyes: Fe and Cu co-doped Bi8La 10 O 27 The concentration of the adsorbent material in the organic dye solution is 0.5-2.0 g / L.

[0019] Compared with the prior art, the present invention has the following beneficial effects.

[0020] 1. High structural stability: The perovskite structure helps the material remain stable in an aqueous environment.

[0021] 2. Abundant active sites: Fe and Cu co-doping forms multi-metal active centers.

[0022] 3. High adsorption efficiency: Achieves efficient removal in a short time.

[0023] 4. Controllable preparation method: The sol-gel process is conducive to the uniform distribution of components.

[0024] 5. Wide range of applications: Suitable for the treatment of low-concentration organic dye wastewater. Attached Figure Description

[0025] Figure 1 Bi8La co-doped with Fe and Cu 10 O 27 XRD pattern of the material.

[0026] Figure 2 Bi8La co-doped with Fe and Cu 10 O 27 Adsorption kinetics of the material for methylene blue: UV-Vis absorption spectrum.

[0027] Figure 3 The image shows the adsorption kinetics of methylene blue, specifically the UV-Vis absorption spectrum and the intensity at 664 nm over time. Detailed Implementation

[0028] To better understand the technical solution of the present invention, specific embodiments are provided for further detailed description, but the solution is not limited thereto.

[0029] Example 1: Fe and Cu co-doped Bi8La 10 O 27 Material preparation.

[0030] Dilute nitric acid is obtained by mixing 98% concentrated nitric acid with deionized water at a volume ratio of 1:1. 80 mL of deionized water is mixed with 1 mL of dilute nitric acid and stirred until a uniform acidic solution is formed.

[0031] Add 4.331 g of lanthanum nitrate, 3.881 g of bismuth nitrate, 0.404 g of ferric nitrate and 0.242 g of copper nitrate to the above solution in sequence, and let them dissolve completely under stirring to obtain a mixed solution.

[0032] Then add 3.152 g of citric acid monohydrate and continue stirring for 30 min to form a homogeneous complex solution.

[0033] The resulting solution was heated and stirred in an 80 °C water bath to gradually evaporate and form a viscous gel. The gel was then transferred to an oven and dried at 120 °C for 10–12 h.

[0034] The dried solid was ground and then calcined in a muffle furnace at 700 °C for 3 h. After cooling to room temperature, it was ground again, washed three times alternately with deionized water and anhydrous ethanol, and then dried to obtain Fe and Cu co-doped Bi8La. 10 O 27 Adsorbent materials Figure 1 The XRD pattern in the middle section confirms the effective synthesis of the material.

[0035] Example 2: Methylene blue adsorption experiment.

[0036] Take 20 mL of solution with a concentration of 2×10 -5 A mol / L methylene blue solution was added to 20 mg of the adsorbent material prepared in Example 1, and the adsorption experiment was carried out in the dark by stirring at 600 r / min at room temperature.

[0037] like Figure 2 As shown in the figure, samples were taken every 5 minutes from the start of the reaction, and their UV-Vis absorbance changes were measured after centrifugation. The graph shows a gradual decrease in absorbance, indicating a decrease in the concentration of methylene blue in the solution.

[0038] Experimental results show that as the adsorption time increases, the characteristic absorption peak of methylene blue at 664 nm in the solution gradually weakens. Figure 3As shown, the removal rate reached 94.9% after 15 minutes, indicating that the material has excellent adsorption performance.

Claims

1. A Fe / Cu co-doped Bi8La 10 O 27 The adsorbent material is characterized by: In an acidic system, a complexation-gel transformation strategy was employed to enable Bi... 3+ La 3+ Fe 3+ and Cu 2+ A homogeneous precursor system is formed, and Fe and Cu are achieved in Bi8La after heat treatment. 10 O 27 Co-doping in the crystal lattice yields Fe and Cu co-doped Bi8La with highly efficient adsorption properties. 10 O 27 Adsorbent materials.

2. The Fe, Cu co-doped Bi8La according to claim 1 10 O 27 The method for preparing adsorbent materials is characterized by: Includes the following steps, 1) Add lanthanum nitrate, bismuth nitrate, ferric nitrate, and copper nitrate to an aqueous nitric acid solution, stir until completely dissolved, add citric acid monohydrate, and continue stirring to form a homogeneous complex solution. 2) After heating and stirring, a viscous gel is formed. The gel is dried to obtain a solid, which is then ground, calcined, cooled, ground again, washed, and dried to obtain Fe and Cu co-doped Bi8La. 10 O 27 Adsorbent materials.

3. The Fe and Cu co-doped Bi8La according to claim 2 10 O 27 The method for preparing adsorbent materials is characterized by: The molar ratio of lanthanum nitrate: bismuth nitrate: ferric nitrate: copper nitrate: citric acid monohydrate is 1:0.8-0.9:0.05-0.1:0.05-0.1:

2.

4. The Fe and Cu co-doped Bi8La according to claim 2 10 O 27 The method for preparing adsorbent materials is characterized by: In step 2), the heating and stirring are carried out at 80°C.

5. The Fe and Cu co-doped Bi8La according to claim 2 10 O 27 The method for preparing adsorbent materials is characterized by: In step 2), the calcination is carried out at 600-800 ℃ for 3 h.

6. A method utilizing the Fe and Cu co-doped Bi8La as described in claim 1 10 O 27 The application of adsorbent materials in the removal of organic dyes is characterized by: The Fe and Cu co-doped Bi8La 10 O 27 The adsorbent material is added to the organic dye solution and adsorption is carried out under stirring conditions.

7. The Fe, Cu co-doped Bi8La according to claim 6 10 O 27 The application of adsorbent materials in the removal of organic dyes is characterized by: The organic dye mentioned is methylene blue.

8. The Fe, Cu co-doped Bi8La according to claim 6 10 O 27 The application of adsorbent materials in the removal of organic dyes is characterized by: The adsorption process is carried out at room temperature with a stirring speed of 300-800 r / min.

9. The Fe, Cu co-doped Bi8La according to claim 6 10 O 27 The application of adsorbent materials in the removal of organic dyes is characterized by: At an initial concentration of 10 for the organic dye -6 -10 -4 mol / L, adsorption time not exceeding 20 min.

10. The Fe, Cu co-doped Bi8La according to claim 6 10 O 27 The application of adsorbent materials in the removal of organic dyes is characterized by: Fe, Cu co-doped Bi8La 10 O 27 The concentration of the adsorbent material in the organic dye solution is 0.5-2.0 g / L.

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