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A method for removing polycyclic aromatic hydrocarbons in water by using iron-manganese double metal oxides to modify biochar-photo-Fenton composites

A technology of bimetallic oxides and composite materials, applied in the direction of metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, oxidized water/sewage treatment, etc., can solve the problem of slow regeneration of active sites and impact on degradation Efficiency, narrow applicable pH range and other issues, to achieve strong hydrogen peroxide decomposition ability, improve catalytic performance, and good catalytic performance

Active Publication Date: 2020-06-26
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the following problems still exist when using photo-Fenton technology to remove polycyclic aromatic hydrocarbons (such as naphthalene) in water: (1) Homogeneous photo-Fenton technology has narrow applicable pH range, difficult recovery of catalyst, low material recycling rate and system (2) During the reaction process, the active sites on the surface of the photo-Fenton catalyst are constantly consumed, and the regeneration rate of the active sites is slow, which affects Degradation efficiency; (3) In the treatment of actual water bodies, due to the fact that there are a large number of coexisting ions in the actual water body, these coexisting ions may have an impact on the degradation of catalyzed oxidized naphthalene

Method used

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  • A method for removing polycyclic aromatic hydrocarbons in water by using iron-manganese double metal oxides to modify biochar-photo-Fenton composites
  • A method for removing polycyclic aromatic hydrocarbons in water by using iron-manganese double metal oxides to modify biochar-photo-Fenton composites
  • A method for removing polycyclic aromatic hydrocarbons in water by using iron-manganese double metal oxides to modify biochar-photo-Fenton composites

Examples

Experimental program
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Effect test

Embodiment 1

[0045] A method for removing polycyclic aromatic hydrocarbons in water by using iron-manganese bimetal oxide modified bio-carbon photo-Fenton composite material, specifically the use of iron-manganese bi-metal oxide modified bio-carbon photo-Fenton composite material to remove naphthalene in water , Including the following steps:

[0046] Weigh biochar monomer material (BC), iron-manganese bimetallic oxide monomer material (FMBO) and iron-manganese bimetallic oxide modified bio-carbon photo-Fenton composite material (A1, A2, A3, A4, A5) , Each 25mg, were added to 100mL, 30mg / L naphthalene solution (the pH value of the solution is 5.6), magnetically stirred under dark conditions for 1h, so that naphthalene on the catalyst surface to achieve adsorption-desorption equilibrium, add 2mL, H at a concentration of 2mol / L 2 O 2 The solution is then subjected to a photo-Fenton reaction for 88 minutes under visible light with a wavelength of 420nm-780nm, wherein the photo-Fenton reaction is...

Embodiment 2

[0070] A method for removing naphthalene in water by using iron-manganese bimetal oxide modified biochar and photo-Fenton composite material, including the following steps:

[0071] Weigh 25mg, 50mg, 100mg, 150mg, 200mg of the iron-manganese bimetal oxide modified bio-carbon photo-Fenton composite material (A3) prepared in Example 1, respectively, and add them to 100mL, 30mg / L naphthalene solution ( The pH value of the solution is 5.5), magnetically stirred for 1 hour in the dark, so that the naphthalene on the catalyst surface to achieve adsorption-desorption equilibrium, add 5mL, a concentration of 2mol / L H 2 O 2 The solution is then subjected to a photo-Fenton reaction for 88 minutes under visible light with a wavelength of 420 nm to 780 nm, wherein the photo-Fenton reaction is performed under magnetic stirring to complete the degradation of naphthalene in the water.

[0072] During the photo-Fenton reaction, a sample was taken every 16 minutes. After the sample was filtered thr...

Embodiment 3

[0077] A method for removing naphthalene in water by using iron-manganese bimetal oxide modified biochar and photo-Fenton composite material, including the following steps:

[0078] Weigh 5 parts of the iron-manganese bimetal oxide modified bio-carbon photo-Fenton composite material (A3) prepared in Example 1, and add 100 mg each to 100 mL, 30 mg / L naphthalene solution (the pH of the solution The value is 5.5), magnetic stirring for 1h in the dark, so that naphthalene reaches the adsorption-desorption equilibrium on the surface of the catalyst, and then add the volume of 1mL, 2.5mL, 5mL, 7.7mL and 10mL H 2 O 2 Solution (These H 2 O 2 The concentration of the solution is 2mol / L), the photo-Fenton reaction is performed under visible light with a wavelength of 420nm-780nm for 88 minutes, and the photo-Fenton reaction is performed under magnetic stirring to complete the degradation of naphthalene in the water.

[0079] During the photo-Fenton reaction, a sample was taken every 16 minute...

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Abstract

The invention discloses a method for removing polycyclic aromatic hydrocarbons in a water body by using an iron-manganese bimetallic oxide modified biological carbon photo-Fenton composite material, which comprises the following steps: mixing the composite material with the water body containing the polycyclic aromatic hydrocarbons, stirring, adding hydrogen peroxide solution, and carrying out photo-Fenton reaction to complete the removal of polycyclic aromatic hydrocarbons in the water body, wherein the composite material comprises biochar and the iron-manganese bimetallic oxide attached to the biochar; the iron-manganese bimetallic oxide is a mixture of iron oxide and manganese oxide, wherein the iron oxide comprises Fe3O4 and Fe2O3, and the manganese oxide comprises Mn3O4 and Mn2O3. Themethod has the advantages of simple process, simple and convenient operation, low cost, high removal efficiency, good removal effect, wide application range, good recycling performance, environmentalfriendliness and the like, and the method can be widely adopted and can efficiently remove polycyclic aromatic hydrocarbons in the water body, and has high application value and commercial value.

Description

Technical field [0001] The invention belongs to the field of advanced oxidation treatment in polluted environment, and relates to a processing method of polycyclic aromatic hydrocarbons, in particular to a method for removing polycyclic aromatic hydrocarbons in water by using iron-manganese bimetal oxide modified biochar and photo-Fenton composite material . Background technique [0002] Polycyclic aromatic hydrocarbons are a typical type of persistent toxic substances, mainly from the incomplete combustion process of fossil fuels and biomass. Although they are small in the environment, they are widely distributed and have good fat solubility. People can pass Ingestion of air, water, food, etc. Polycyclic aromatic hydrocarbons have strong carcinogenic, mutagenic and teratogenic properties, and are currently the largest single chemical species with carcinogenicity in the known environment. Therefore, the U.S. Environmental Protection Agency has listed 16 PAHs as priority polluta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/72C02F1/30B01J23/889C02F101/32
CPCB01J23/002B01J23/8892C02F1/30C02F1/722C02F1/725C02F2101/327C02F2305/023C02F2305/026C02F2305/10
Inventor 赖萃李玲黄芳龙程敏曾光明李必胜黄丹莲秦蕾刘希贵易欢柳诗语何江凡张玉锦史晓勋
Owner HUNAN UNIV
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