Bismuth ferrate-carbon nano tube, preparation method thereof and method for treating organic dye wastewater by utilizing bismuth ferrate-carbon nano tube

A carbon nanotube and organic dye technology, applied in the field of wastewater treatment, can solve problems such as no water treatment technology, unsuitable for household use, secondary pollution, etc., and achieve easy large-scale production and use, reduce equipment investment, and total cost. low effect

Inactive Publication Date: 2012-06-13
NANJING UNIV
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Problems solved by technology

There are also microwave-treated activated carbon (Jou, G. C. J., Application of activated carbon in a microwave radiation field to treat trichloroethylene. In 1998; Vol. 36, pp 1643) and silicon carbide materials (Pallavkar, S.; Kim , T.-H.; Lin, J.; Hopper, J.; Ho, T.; Jo, H.-J.; Lee, J.-H., Microwave-Assisted Noncatalytic Destruction of Volatile Organic Compounds Using Ceramic- Based Microwave Absorbin...
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Abstract

The invention discloses a bismuth ferrate-carbon nano tube, a preparation method thereof and a method for treating organic dye wastewater by utilizing the bismuth ferrate-carbon nano tube and belongs to the field of wastewater treatment. The preparation method of the bismuth ferrate-carbon nano tube comprises the following steps of: (1) dissolving ferric nitrate and bismuth nitrate in pure 2-methoxyethanol; (2) adding a nitric acid solution; (3) adding the carbon nano tube, citric acid and glycol; (4) rising the temperature for heating so as to form sol; (5) rising the temperature for evaporating a solvent so as to form gel; (6) calcining; and (7) rising temperature and calcining to obtain crystal. The method for treating the organic dye wastewater by utilizing the bismuth ferrate-carbon nano tube prepared by the preparation method comprises the following steps of: (A) settling the wastewater containing organic dyes and taking supernatant liquor; (B) adding the bismuth ferrate-carbon nano tube; (C) recovering the bismuth ferrate-carbon nano tube; and (D) heating the bismuth ferrate-carbon nano tube in a microwave oven, and putting the bismuth ferrate-carbon nano tube into use again. The material and the method for treating the organic dye wastewater are strong in applicability, fast and energy-saving and can be better combined with the existing process.

Application Domain

Other chemical processesWater contaminants +5

Technology Topic

Process engineeringMicrowave oven +8

Examples

  • Experimental program(6)

Example Embodiment

[0035] Example 1
[0036] A method for preparing bismuth ferrite-carbon nanotubes, the steps are:
[0037] (1) Dissolve the same number of moles of iron nitrate and bismuth nitrate in pure 2-methoxyethanol so that the concentrations of iron nitrate and bismuth nitrate are both 0.3 mol/L.
[0038] (2) Add 0.1 mol/L nitric acid solution to the solution formed in step (1) while stirring. The volume of the added nitric acid solution is 0.05% of 2-methoxyethanol, and adjust the pH to 5.
[0039] (3) While stirring, add carbon nanotubes, citric acid with the same mole number as ferric nitrate, and ethylene glycol with 1/3 of the volume of 2-methoxyethanol as dispersant into the solution in step (2), and continue stirring for 2 Hours.
[0040] (4) Raise the temperature to 55°C and keep it at that temperature, and stir for 1 hour to form a sol.
[0041] (5) Raise the temperature to 85°C and keep it at this temperature, evaporate the solvent to form a gel, take out the gel and grind until it is powdered and mixed;
[0042] (6) The powder is calcined at a temperature of 250° C. for 5 minutes to remove the organic solvent and nitrate ions; in the step (6), the powder is calcined in a resistance furnace.
[0043] (7) Raise the temperature to 500°C and keep it at this temperature, and calcinate for 2.5 hours to obtain crystals, namely bismuth ferrite-carbon nanotubes.
[0044] The method for treating wastewater containing organic dyes using the bismuth ferrite-carbon nanotubes prepared by the above preparation method includes the following steps:
[0045] (A) After removing the dregs of wastewater containing organic dyestuffs for initial sedimentation or natural sedimentation, take the supernatant liquid.
[0046] (B) The clear liquid obtained in step (A) is introduced into a reaction vessel containing the bismuth ferrite-carbon nanotubes prepared by the method of claim 1, and the bismuth ferrite-carbon nanotube pair is completed by stirring or standing still In the dye adsorption process, after fully adsorbing, place the magnet close to the bottom of the container. At this time, rely on the magnetic force of the magnet to attract the bismuth ferrite-carbon nanotubes and pour out the water in the reaction container; ferric acid added in step (B) The concentration of bismuth-carbon nanotubes is 0.1 g/L.
[0047] (C) Remove the magnet and recover the bismuth ferrite-carbon nanotubes.
[0048] (D) Immerse the recovered bismuth ferrite-carbon nanotubes in water and place them in a microwave oven to heat for 10 minutes. Under these conditions, the recovered bismuth ferrite-carbon nanotubes can be used again. In the step (D), after the recovered bismuth ferrite-carbon nanotubes are used 3 times, they are recovered in the step (C) of the next use of the bismuth ferrite-carbon nanotubes and placed at 500°C. Calcined under C condition to restore the original magnetic properties of bismuth ferrite-carbon nanotubes.

Example Embodiment

[0049] Example 2
[0050] A method for preparing bismuth ferrite-carbon nanotubes, the steps are:
[0051] (1) Dissolve the same number of moles of iron nitrate and bismuth nitrate in pure 2-methoxyethanol so that the concentrations of iron nitrate and bismuth nitrate are both 0.5 mol/L.
[0052] (2) Add a 0.2mol/L nitric acid solution to the solution formed in step (1) while stirring. The volume of the added nitric acid solution is 0.2% of 2-methoxyethanol. Adjust the pH to 7.
[0053] (3) While stirring, add carbon nanotubes, citric acid with the same mole number of ferric nitrate and ethylene glycol 2/3 of the volume of 2-methoxyethanol to the solution in step (2) as a dispersant, and continue to stir for 2.5 Hours.
[0054] (4) Raise the temperature to 65°C and keep it at that temperature, and stir for 1.5 hours to form a sol.
[0055] (5) Raise the temperature to 105°C and keep it at this temperature, evaporate the solvent to form a gel, take out the gel and grind until it is powdered and mixed.
[0056] (6) The powder is calcined at a temperature of 300° C. for 10 minutes to remove the organic solvent and nitrate ion; in the step (6), the powder is calcined in a resistance furnace.
[0057] (7) Raise the temperature to 600°C and keep it at this temperature, and calcinate for 4 hours to obtain crystals, namely bismuth ferrite-carbon nanotubes.
[0058] The method for treating wastewater containing organic dyes using the bismuth ferrite-carbon nanotubes prepared by the above preparation method includes the following steps:
[0059] (A) After removing the dregs of wastewater containing organic dyestuffs for initial sedimentation or natural sedimentation, take the supernatant liquid.
[0060] (B) The clear liquid obtained in step (A) is introduced into a reaction vessel containing the bismuth ferrite-carbon nanotubes prepared by the method of claim 1, and the bismuth ferrite-carbon nanotube pair is completed by stirring or standing still In the dye adsorption process, after fully adsorbing, place the magnet close to the bottom of the container. At this time, rely on the magnetic force of the magnet to attract the bismuth ferrite-carbon nanotubes and pour out the water in the reaction container; ferric acid added in step (B) The concentration of bismuth-carbon nanotubes is 10g/L.
[0061] (C) Remove the magnet and recover the bismuth ferrite-carbon nanotubes.
[0062] (D) The recovered bismuth ferrite-carbon nanotubes are immersed in water and heated in a microwave oven for 50 minutes. Under these conditions, the recovered bismuth ferrite-carbon nanotubes can be used again.
[0063] In the step (D), after the recovered bismuth ferrite-carbon nanotubes are used 5 times, they are recovered in step (C) of the next use of the bismuth ferrite-carbon nanotubes and placed at 600° Calcined under C condition to restore the original magnetic properties of bismuth ferrite-carbon nanotubes.

Example Embodiment

[0064] Example 3
[0065] A method for preparing bismuth ferrite-carbon nanotubes, the steps are:
[0066] (1) Dissolve the same number of moles of iron nitrate and bismuth nitrate in pure 2-methoxyethanol so that the concentrations of iron nitrate and bismuth nitrate are both 0.4 mol/L.
[0067] (2) Add 0.15 mol/L nitric acid solution to the solution formed in step (1) while stirring. The volume of the added nitric acid solution is 0.15% of 2-methoxyethanol, and adjust the pH to 6.
[0068] (3) While stirring, add carbon nanotubes, citric acid with the same mole number as ferric nitrate and ethylene glycol with 1/2 the volume of 2-methoxyethanol as dispersant into the solution in step (2), and continue stirring for 3 Hours.
[0069] (4) Raise the temperature to 60°C and keep it at this temperature, and stir for more than one hour to form a sol.
[0070] (5) Raise the temperature to 90°C and keep it at this temperature, evaporate the solvent to form a gel, take out the gel and grind until it is powdered and mixed.
[0071] (6) The powder is calcined at a temperature of 270° C. for 8 minutes to remove the organic solvent and nitrate ions; in the step (6), the powder is calcined in a resistance furnace.
[0072] (7) Raise the temperature to 550°C and keep it at this temperature, and calcinate for 3 hours to obtain crystals, namely bismuth ferrite-carbon nanotubes.
[0073] The method for treating wastewater containing organic dyes using the bismuth ferrite-carbon nanotubes prepared by the above preparation method includes the following steps:
[0074] (A) After removing the dregs of wastewater containing organic dyestuffs for initial sedimentation or natural sedimentation, take the supernatant liquid.
[0075] (B) The clear liquid obtained in step (A) is introduced into a reaction vessel containing the bismuth ferrite-carbon nanotubes prepared by the method of claim 1, and the bismuth ferrite-carbon nanotube pair is completed by stirring or standing still In the dye adsorption process, after fully adsorbing, place the magnet close to the bottom of the container. At this time, rely on the magnetic force of the magnet to attract the bismuth ferrite-carbon nanotubes and pour out the water in the reaction container; ferric acid added in step (B) The concentration of bismuth-carbon nanotubes is 5g/L.
[0076] (C) Remove the magnet and recover the bismuth ferrite-carbon nanotubes.
[0077] (D) The recovered bismuth ferrite-carbon nanotubes are immersed in water and heated in a microwave oven for 30 minutes. Under these conditions, the recovered bismuth ferrite-carbon nanotubes can be used again.
[0078] In the step (D), after the recovered bismuth ferrite-carbon nanotubes are used 4 times, they are recovered in the step (C) of the next use of the bismuth ferrite-carbon nanotubes and placed at 550°C. Calcined under C condition to restore the original magnetic properties of bismuth ferrite-carbon nanotubes.

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