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Activated oxygen carbon for enhancing removal efficiency of Fenton-like reaction and preparation and use method thereof

A Fenton reaction and active oxygen technology, applied in chemical instruments and methods, oxidation treatment of sludge, oxidized water/sewage treatment, etc., can solve the problem of reducing the utilization efficiency of hydrogen peroxide, low contribution of Fenton oxidation reaction, low utilization efficiency of oxidants, etc. problem, to achieve the effect of high active oxygen utilization efficiency and pollutant removal efficiency, accelerated Fenton-like reaction rate, and wide application range of the reaction

Active Publication Date: 2022-07-05
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the following problems have been found in the application practice in natural water bodies and soil environments: (1) hydrogen peroxide has the risk of explosion during transportation and storage; (2) active oxygen is easily converted into oxygen and lost when hydrogen peroxide is in use, The utilization efficiency of the oxidant is very low; (3) in the Fenton oxidation reaction, the removal efficiency is low due to the slow reduction of ferric iron
However, the reactivity of superoxide radicals is relatively weak, and they rapidly disproportionate into oxygen, which contributes less to the Fenton oxidation reaction, and the generation of superoxide radicals will reduce the utilization efficiency of hydrogen peroxide.

Method used

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  • Activated oxygen carbon for enhancing removal efficiency of Fenton-like reaction and preparation and use method thereof
  • Activated oxygen carbon for enhancing removal efficiency of Fenton-like reaction and preparation and use method thereof

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preparation example Construction

[0044] The preparation method of the activated oxygen carbon for enhancing the removal efficiency of the Fenton-like reaction comprises the following steps:

[0045] S1: add water and hydroxide to the biochar, and stir to obtain a suspension;

[0046] S2: in the suspension, add silicate and hydrogen peroxide, and stir to react;

[0047] S3: After the reaction, the solid is separated, washed and dried to obtain the activated oxygen carbon with enhanced Fenton-like reaction removal efficiency.

[0048] Preferably, the shape of the biochar is powder or granular.

[0049] Preferably, in step S1, the quality of the water is 5-100 times that of the biochar.

[0050] Preferably, in step S1, the hydroxide is calcium or magnesium hydroxide, and the quality of the hydroxide is 0.5 to 5 times that of the biochar.

[0051] Preferably, in step S2, the mass concentration of hydrogen peroxide is 30%, and the molar ratio of hydrogen peroxide to hydroxide is 1-3:1.

[0052] Preferably, in st...

Embodiment 1

[0067] In 1.2 grams of powdered biochar, add 7 grams of water and 2.5 grams of calcium hydroxide, and stir to obtain a suspension; to the above suspension, successively add 0.05 grams of calcium silicate and 4.5 ml of hydrogen peroxide with a mass concentration of 30% , stirred and reacted at 40 degrees for 1 hour; the solid powder in the suspension was separated by filtration, washed with absolute ethanol, and dried in a blast drying oven at 30 ° C for 12 hours to finally synthesize activated oxygen carbon, in which biochar : calcium peroxide: calcium silicate mass ratio of 1:2:0.02. The Raman spectra and digital photos of the synthesized activated oxygen carbon are as follows figure 1 shown, in which the Raman absorption peak of the peroxy bond is from 843 cm -1 Move right to 845cm -1 , indicating that there is a strong bonding interaction between peroxide and biochar.

[0068] The activated oxygen carbon is used for oxidative degradation of antibiotics in water, wherein ...

Embodiment 2

[0072] In 1.2 grams of powdered biochar, add 6 grams of water and 0.6 grams of calcium hydroxide, and stir to obtain a suspension; in the above suspension, successively add 0.025 grams of calcium silicate and 0.85 ml of hydrogen peroxide with a mass concentration of 30% , stirred and reacted at 10 degrees for 0.5 hours; the solid powder in the suspension was separated by filtration, washed with anhydrous ethanol, and dried in a blast drying oven at 30 ° C for 12 hours to finally synthesize activated oxygen carbon, among which biochar : calcium peroxide: calcium silicate mass ratio of 1:0.5:0.01.

[0073] The activated oxygen carbon is used for oxidative degradation of antibiotics in water, wherein the molar ratio of activated oxygen carbon / ferric chloride is 1:0.1, the molar ratio of ferric chloride and succinic acid is 1:0.5, and the mass ratio of activated oxygen carbon: water is 0.01%, After 20 minutes of reaction, sulfamethoxazole was completely decomposed, and the removal...

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Abstract

The invention relates to an activated oxygen carbon capable of enhancing the removal efficiency of a Fenton-like reaction and a method for preparing and using the same. The activated oxygen carbon includes biochar, peroxide and silicate, and the biochar, peroxide and SiO 2 The mass ratio of the calculated silicate is 1:(0.5~5):(0.01~0.1); the peroxide is calcium peroxide or magnesium peroxide, and the silicate is sodium silicate, magnesium silicate or calcium silicate , the preparation method is to add silicate and hydrogen peroxide in the suspension of biochar and hydroxide, after stirring reaction, separation, washing and drying; in use, by mixing activated oxygen carbon with iron salt, chelating agent It forms a Fenton-like oxidation reaction system to remove refractory organic pollutants in soil, sediment and water. Compared with the prior art, the present invention has the advantages of simple process operation, mild reaction conditions, wide application range and high removal efficiency, and can be widely used in the restoration of organic polluted soil and water bodies and wastewater treatment.

Description

technical field [0001] The invention belongs to the field of environmental protection, and relates to an environmental functional material for removing refractory organic pollutants, in particular to an activated oxygen carbon capable of enhancing the removal efficiency of a Fenton-like reaction and a preparation and use method thereof. Background technique [0002] Refractory organic pollutants, including traditional persistent organic pollutants such as DDT, polycyclic aromatic hydrocarbons, etc., as well as emerging pollutants such as antibiotics, flame retardants, perfluorinated compounds, etc., are widely present in the environment and are harmful to the ecological environment and human health. pose a serious threat. Chemical oxidation is a common and effective organic pollution control method, among which Fenton and Fenton-like oxidation technologies based on hydrogen peroxide are widely used. However, the application practice in natural water and soil environment has...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/72C02F11/06B09C1/08C02F101/30
CPCC02F1/722C02F1/725C02F11/06B09C1/08C02F2101/30C02F2305/026Y02W10/10
Inventor 龙明策朱奕曈张姝琪
Owner SHANGHAI JIAOTONG UNIV
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