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Biochar-loaded zero-valent iron composite material and preparation method thereof

A composite material and biomass material technology, which is applied in the field of biochar-loaded zero-valent iron composite material and its preparation field, can solve the problems of complicated operation, serious environmental pollution and high price, and achieves simple operation, easy availability of raw materials and low cost of raw materials. Effect

Active Publication Date: 2019-06-28
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method requires the use of a relatively expensive reducing agent, and at the same time produces a large amount of borate waste, which is complicated to operate and seriously pollutes the environment

Method used

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  • Biochar-loaded zero-valent iron composite material and preparation method thereof
  • Biochar-loaded zero-valent iron composite material and preparation method thereof
  • Biochar-loaded zero-valent iron composite material and preparation method thereof

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preparation example Construction

[0029] The invention provides a method for preparing a biochar-supported zero-valent iron composite material, comprising the following steps:

[0030] (1) mixing the aqueous solution of the biomass material and the iron source, and ultrasonically dispersing to obtain a raw material mixture; the iron source is at least one of iron salt and ferrous salt;

[0031] (2) subjecting the raw material mixture to a hydrothermal reaction to obtain an iron-carbon precursor;

[0032] (3) Calcining the iron-carbon precursor in an inert gas atmosphere to obtain a biochar-loaded zero-valent iron composite material.

[0033] The invention mixes the aqueous solution of the biomass material and the iron source, and disperses through ultrasonic to obtain the raw material mixture.

[0034] In the present invention, the biomass material is preferably at least one of orange peel, orange peel, pomelo peel, lemon peel, orange peel, bamboo powder and cellulose; the pomelo peel is preferably grapefruit...

Embodiment 1

[0062] Washing, drying and pulverizing the pomelo peel in sequence, then passing through a 100-mesh sieve, and taking the part under the sieve to obtain the biomass material;

[0063] The biomass material and the ferric chloride aqueous solution are mixed according to the ratio of solid-liquid ratio of 0.1g:1mL, and the mass ratio of the biomass material and the ferric chloride aqueous solution is 100:10; after mixing, the resulting mixture Ultrasonic dispersion for 120 minutes to obtain a raw material mixture; the power of ultrasonic dispersion is 100W;

[0064] Put the raw material mixture in a polytetrafluoroethylene-lined autoclave for hydrothermal reaction, raise the temperature to 200°C at a heating rate of 1°C / min, and react at 200°C for 2 hours; after the reaction is completed, filter and wash in sequence and freeze-drying to obtain an iron-carbon precursor;

[0065] The iron-carbon precursor was transferred to a tube furnace, heated to 600°C at a rate of 5°C / min in a...

Embodiment 2

[0073] Washing, drying and pulverizing the pomelo peel in sequence, and passing through a 100-mesh sieve to obtain a biomass material;

[0074] The biomass material and the ferric chloride aqueous solution are mixed according to the ratio of solid-liquid ratio of 0.1g:1mL, and the mass ratio of the biomass material and the ferric chloride aqueous solution is 100:5; after mixing, the resulting mixture Ultrasonic dispersion for 120 minutes to obtain a raw material mixture; the power of ultrasonic dispersion is 100W;

[0075] Put the raw material mixture in a polytetrafluoroethylene-lined autoclave for hydrothermal reaction, raise the temperature to 200°C at a heating rate of 1°C / min, and react at 200°C for 2 hours; after the reaction is completed, filter and wash in sequence and freeze-drying to obtain an iron-carbon precursor;

[0076] The iron-carbon precursor was transferred to a tube furnace, heated to 600°C at a rate of 5°C / min in an inert gas atmosphere, and calcined at 6...

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Abstract

The invention belongs to the technical field of organic matter catalytic degradation materials, and provides a biochar-loaded zero-valent iron composite material and a preparation method thereof. Thepreparation method comprises the following steps that 1, a biomass material is mixed with an aqueous solution of an iron source, and ultrasonic dispersion is carried out to obtain a raw material mixture, wherein the iron source is at least one of iron salt and ferrous salt; 2, a hydrothermal reaction is carried out on the raw material mixture to obtain an iron-carbon precursor; 3, the iron-carbonprecursor is calcined in an inert gas atmosphere to obtain the biochar-loaded zero-valent iron composite material. According to the method, a reducing agent is not needed, the raw materials are cheapand easy to obtain, the amount of generated wastewater is small, the operation is simple, and the method is an environment-friendly process.

Description

technical field [0001] The invention relates to the technical field of organic matter catalytic degradation materials, in particular to a biochar-loaded zero-valent iron composite material and a preparation method thereof. Background technique [0002] The standard reduction potential E of zero-valent iron Fe(0) 0 =(Fe 2+ / Fe=-0.44V), its chemical properties are very active and have strong reducibility. Zero-valent iron has a good application prospect in the degradation of inorganic and organic pollutants, but due to the high activity of zero-valent iron, it is very easy to react with oxygen in the air to form an oxide film, which reduces the reaction rate. Zero-valent iron itself has a magnetic effect and is prone to agglomeration, which will reduce its reactivity and migration rate, which seriously hinders the wide application of zero-valent iron. Therefore, optimizing the modification of zero-valent iron to improve its stability and reactivity has become a research hot...

Claims

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Application Information

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IPC IPC(8): B01J23/745B01J37/34B01J37/10B01J37/08B01D53/02C02F1/28B01J20/20B01J20/28C02F101/38
Inventor 闵露娟孙红文张鹏范明毅
Owner NANKAI UNIV
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