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Preparation and application of hierarchical pore-low valent iron Fenton sludge-based heterogeneous catalyst

A heterogeneous catalyst, low-valent iron technology, applied in catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problem of low reaction mass transfer efficiency and slow rate , secondary pollution and other problems, to achieve the effect of reducing disposal and resource utilization, high efficiency, and small secondary pollution

Active Publication Date: 2020-07-03
CHINA UNIV OF MINING & TECH
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  • Abstract
  • Description
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Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of preparation and the application method of multistage hole-low price iron Fenton sludge base heterogeneous catalyst, solve the reaction mass transfer efficiency that existing Fenton sludge base heterogeneous catalyst exists is low, H 2 o 2 The slow rate of reducing Fe(Ⅲ) to Fe(Ⅱ) and the problem of secondary pollution during the preparation process

Method used

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  • Preparation and application of hierarchical pore-low valent iron Fenton sludge-based heterogeneous catalyst
  • Preparation and application of hierarchical pore-low valent iron Fenton sludge-based heterogeneous catalyst
  • Preparation and application of hierarchical pore-low valent iron Fenton sludge-based heterogeneous catalyst

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preparation example Construction

[0029] The preparation steps of Fenton sludge-based heterogeneous catalyst are as follows:

[0030] (1) Dry the Fenton sludge at 105°C, crush and grind it and pass through a 120-mesh sieve to make Fenton sludge raw material;

[0031] (2) Take the sieved Fenton sludge as raw material, add biochemical sludge as an auxiliary carbon source, mix the two evenly in proportion and place them in a fixed-bed reactor;

[0032] (3) Feed nitrogen into the fixed bed reactor at a gas flow rate of 100-120ml / min, control the heating rate of the reactor to be 3-10°C / min, the pyrolysis temperature to be 400-900°C, and the pyrolysis time to be 30 -90min, Fe3+ in Fenton sludge is reduced by reducing gas generated by pyrolysis to obtain low-priced iron Fenton sludge-based biochar;

[0033] (4) After the obtained low-priced iron Fenton sludge-based biochar is cooled, the biochar is transferred to the steam explosion tank, and after maintaining for 10 minutes under the conditions of the set temperat...

Embodiment 1

[0040] Example 1: Preparation and characterization process of low-temperature Fenton sludge-based heterogeneous catalyst and its application

[0041] (1) Take the printing and dyeing Fenton sludge and dry it at 105°C, crush it and pass it through a 120-mesh sieve;

[0042] (2) With sieved Fenton sludge as raw material, biochemical sludge as auxiliary carbon source, the two are mixed in a ratio of 3:1 and then filled in a boat-shaped crucible;

[0043] (3) Place the boat crucible in high temperature N 2 In the protective tube furnace, the heating rate was controlled to be 10°C / min, the pyrolysis temperature was 500°C, and the pyrolysis time was 60 minutes to obtain low-valent iron Fenton sludge-based biochar;

[0044] (4) After cooling the obtained biochar, under the conditions of 170°C temperature, 2.0MPa pressure and 10wt% water vapor content, the biochar was constructed by steam explosion method to obtain low-temperature Fenton sludge-based homogeneous catalyst.

[0045] ...

Embodiment 2

[0048] Example 2: High temperature Fenton sludge-based heterogeneous catalyst degradation methylene blue test

[0049] (1) Take the printing and dyeing Fenton sludge and dry it at 105°C, crush it and pass it through a 120-mesh sieve;

[0050] (2) With sieved Fenton sludge as raw material, biochemical sludge as auxiliary carbon source, the two are mixed in a ratio of 3:1 and then filled in a boat-shaped crucible;

[0051] (3) Place the boat crucible in high temperature N 2 In the protective tube furnace, the heating rate was controlled to be 5°C / min, the pyrolysis temperature was 800°C, and the pyrolysis time was 30 minutes to obtain low-valent iron Fenton sludge-based biochar;

[0052] (4) After cooling the obtained biochar, under the condition of temperature of 230°C, pressure of 2.7MPa and water vapor content of 15wt%, the biochar was constructed by steam explosion method to obtain high-temperature Fenton sludge-based homogeneous catalyst.

[0053] Prepare the methylene b...

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Abstract

The invention discloses preparation and application of a hierarchical pore-low valent iron Fenton sludge-based heterogeneous catalyst, and belongs to the technical field of water treatment catalysis.The preparation process of the heterogeneous catalyst comprises the following steps: taking Fenton sludge as a raw material, mixing the raw material with biochemical sludge, then carrying out co-pyrolysis to obtain low valent iron biochar; and constructing pores with different sizes in the low valent iron biochar by utilizing a steam explosion method so as to obtain the hierarchical pore-low valent iron Fenton sludge-based heterogeneous catalyst. The heterogeneous catalyst is used for replacing homogeneous Fe<2+> to realize efficient degradation of organic pollutants in wastewater. The heterogeneous catalyst has the advantages of wide pH value application range, high catalytic efficiency and strong stability. The heterogeneous catalyst has the advantages that the reduction treatment and resource utilization of dangerous solid waste namely Fenton sludge can be realized, the cost of exogenous iron and the subsequent treatment cost of Fenton sludge can be saved, and the heterogeneous catalyst has a wide prospect in organic wastewater treatment.

Description

technical field [0001] The invention relates to the technical field of water treatment catalysis, in particular to the preparation and application of a multi-level pore-low-valent iron Fenton sludge-based heterogeneous catalyst. Background technique [0002] Fenton technology is Fenton oxidation technology to Fe 2+ as catalyst, H 2 o 2 as the oxidizing agent, through Fe 2+ with H 2 o 2 Electron transfer between H 2 o 2 Activated and decomposed into OH, which has the advantages of simple operation, fast reaction, low price and environmental friendliness. However, the traditional homogeneous Fenton catalyst is dissolved Fe 2+ / Fe 3+ , before and after the reaction need to be adjusted by acid and alkali, which increases the operating cost; and after the reaction, the catalyst is difficult to recycle, and a large amount of difficult-to-handle iron-containing Fenton sludge will be formed. Fenton sludge is classified as hazardous solid waste, which has the characteristic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01J37/10B01J37/08C02F1/72C02F101/30
CPCB01J23/745B01J37/10B01J37/084C02F1/722C02F1/725C02F2305/026C02F2101/308
Inventor 高丽慧李树磊
Owner CHINA UNIV OF MINING & TECH
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