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Preparation method and application of corncob biomass carbon dot composite Bi2WO6 photocatalyst based on magnetic Fe3O4 modification

A cds-bi2wo6, biomass carbon technology, used in metal/metal oxide/metal hydroxide catalysts, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve problems such as environmental pollution and achieve secondary recovery Reuse avoidance, good photocatalytic activity and stability, and the effect of improving photocatalytic effect

Pending Publication Date: 2020-12-22
TONGHUA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually direct combustion of biomass materials produces CO 2 and nitrogen oxides (NOx), these gases emitted into the atmosphere will cause environmental pollution

Method used

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  • Preparation method and application of corncob biomass carbon dot composite Bi2WO6 photocatalyst based on magnetic Fe3O4 modification
  • Preparation method and application of corncob biomass carbon dot composite Bi2WO6 photocatalyst based on magnetic Fe3O4 modification
  • Preparation method and application of corncob biomass carbon dot composite Bi2WO6 photocatalyst based on magnetic Fe3O4 modification

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Experimental program
Comparison scheme
Effect test

experiment example

[0046] Evaluation of photocatalytic activity: carried out in a photochemical reaction instrument, adding 100 mL of 20 mg / L tetracycline simulated wastewater into the reaction bottle, then adding magnetons and 0.1 g of photocatalyst, turning on the visible light power supply and aeration device for dynamic adsorption, and starting An external super constant temperature water bath controls the temperature of the reaction system at 30°C. After reaching the adsorption equilibrium, light reaction was carried out, samples were taken every 15 minutes, centrifuged, and the concentration of tetracycline in the supernatant was measured by C / C 0 To judge the degradation effect of tetracycline. Among them, C 0 is the concentration of tetracycline after adsorption equilibrium, C t is the concentration of tetracycline at the reaction time T.

[0047] Based on magnetic Fe 3 o 4 Modified corn cob biomass carbon dot composite Bi 2 WO 6 The preparation method of photocatalyst, the steps ...

Embodiment 1

[0063] Take the experimental example:

[0064] In step 1, the mass of the corn cob is 200 g, and the drying temperature is 50°C.

[0065]In step 2, the amount of corncob powder used was 1 g, the amount of deionized water used was 30 mL, the magnetic stirring time was 1 h, the hydrothermal reaction temperature was 180 ° C, the reaction time was 4 h, and the dialysis The drying time was 24 h, and the evaporation temperature was 100 °C.

[0066] In step 3, the Bi(NO 3 ) 3 ·5H 2 The dosages of O and acetic acid were 0.5 g and 15 mL, respectively. Magnetic stirring, the Na used 2 WO 4 2H 2 The dosages of O and deionized water were 0.1 g and 20 mL, respectively. Magnetic stirring.

[0067] When the solution B was added dropwise to the solution A, Bi(NO 3 ) 3 ·5H 2 O and Na 2 WO 4• 2H 2 The masses of O are 0.5 g and 0.1 g, respectively. Magnetic stirring. The temperature of the vacuum drying is 60°C. The above magnetic stirring time is 30min.

[0068] In step 4, th...

Embodiment 2

[0074] Take the experimental example:

[0075] In step 1, the quality of the corn cob is 200 g. The drying temperature is 50°C.

[0076] In step 2, the amount of corncob powder used was 2 g, the amount of deionized water used was 150 mL, the magnetic stirring time was 1 h, the hydrothermal reaction temperature was 180 ° C, the reaction time was 4 h, and the dialysis The drying time was 24 h, and the evaporation temperature was 100 °C.

[0077] In step 3, the Bi(NO 3 ) 3 ·5H 2 The dosages of O and acetic acid were 5 g and 150 mL, respectively. Magnetic stirring. Na used 2 WO 4 2H 2 The dosages of O and deionized water were 1 g and 200 mL, respectively. Magnetic stirring.

[0078] When the solution B was added dropwise to the solution A, Bi(NO 3 ) 3 ·5H 2 O and Na 2 WO 4• 2H 2 The masses of O are 5 g and 1 g, respectively. Magnetic stirring. The vacuum drying temperature is 80°C. The above magnetic stirring time is 30min.

[0079] In step 4, the FeCl 3 . 6...

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Abstract

The invention belongs to the technical field of chemical preparation of environmental materials, and particularly relates to a preparation method and application of a corncob biomass carbon dot composite Bi2WO6 photocatalyst based on magnetic Fe3O4 modification. The method comprises the following steps: step 1, treating a corncob precursor; step 2, preparing biomass carbon dots (CDs); step 3, preparing Bi2WO6; step 4, preparing Fe3O4; step 5, preparing CDs / Bi2WO6; and step 6, adding the CDs / Bi2WO6 obtained in the step 5 into the Fe3O4 nanosphere precursor solution obtained in the step 4, conducting heating in a polytetrafluoroethylene reaction kettle, washing the obtained product with ethanol and deionized water, and conducting drying for later use. The magnetic Fe3O4 modified corncob biomass carbon dot composite Bi2WO6 photocatalyst prepared by the method is used for photocatalytic degradation of tetracycline. The corncobs are applied to preparation of biomass carbon dots, so that waste is turned into wealth; and Fe3O4 is used as a composite material to prepare the composite photocatalyst, so that the catalyst can be recycled and reused, and the waste of resources is avoided. Thephotocatalyst has excellent photocatalytic activity and stability.

Description

technical field [0001] The invention belongs to the technical field of chemical preparation of environmental materials, in particular to 3 o 4 Modified corn cob biomass carbon dot composite Bi 2 WO 6 Preparation method and application of photocatalyst. Background technique [0002] In the prior art, environmental pollution and energy shortage are two hot issues in the world in the past ten years. Organic pollutants and toxic pollutants are harmful to human health and hinder sustainable and healthy development, especially the pollution of special antibacterial drugs due to the rapid development of the pharmaceutical industry and the rapid development of modern medical technology has now become a major crisis for public health institutions. As one of the most promising solutions to degrade various antibiotic pollutants, photocatalytic technology is an emerging high-efficiency and energy-saving modern sewage treatment technology. From Fujishima et al. in 1972, TiO 2 After ...

Claims

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Application Information

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IPC IPC(8): B01J23/888B01J35/00B01J37/08B01J37/10C02F1/30C02F101/38C02F101/34
CPCB01J37/084B01J37/10B01J23/888C02F1/30C02F2305/10C02F2101/34C02F2101/38B01J35/39B01J35/33
Inventor 于洋董丽红李秀梅
Owner TONGHUA NORMAL UNIV
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