Amorphous iron oxyhydroxide-biochar composite material and preparation method thereof

An iron oxyhydroxide, composite material technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, chemical/physical processes, etc., can solve problems such as unfavorable large-scale integrated production, ethanol flammability problems such as the risk of increased preparation and the high price of ethanol solvents

Inactive Publication Date: 2021-04-23
BEIJING JIAOTONG UNIV
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Problems solved by technology

However, ethanol is not suitable for long-distance transportation, and the high-purity ethanol solvent is expensive. At the same

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  • Amorphous iron oxyhydroxide-biochar composite material and preparation method thereof
  • Amorphous iron oxyhydroxide-biochar composite material and preparation method thereof
  • Amorphous iron oxyhydroxide-biochar composite material and preparation method thereof

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[0022] The invention provides a preparation method of amorphous iron oxyhydroxide-biochar composite material, comprising the following steps:

[0023] Carbonizing the silica-containing biomass to obtain biochar material;

[0024] The biochar material is mixed with an aqueous iron salt solution, and a hydrothermal reaction is performed under alkaline conditions to obtain an amorphous iron oxyhydroxide-biochar composite material.

[0025] In the present invention, unless otherwise specified, the used preparation raw materials are all commercially available commodities well known to those skilled in the art.

[0026] In the present invention, the silica-containing biomass is carbonized to obtain a bio-char material. In the present invention, the content of silica in the silica-containing biomass is preferably 2%, more preferably 10%. In the present invention, the silica-containing biomass preferably includes one or more of corn stover, wheat stover and cotton stover.

[0027] ...

Embodiment 1

[0039] The corn stover with a silica content of 10% was pulverized to a particle size of 0.15 mm, washed with water, dried at 105 °C for 24 hours, heated at 600 °C for 2 hours, and carbonized; the obtained carbonized product was washed with water 8 times, Drying at 110°C for 24h to obtain biochar material;

[0040] The biochar material was put into an aqueous ferric nitrate solution with a mass concentration of 5 g / L, and the mass ratio of the biochar material to the ferric nitrate was 1:4, slowly stirred at 500 rpm for 24 hours, and added dropwise to the obtained mixed solution. Drop into the sodium hydroxide solution that concentration is 1mol / L, make the pH of solution be 12.03, transfer to the hydrothermal reaction still in 1min and carry out hydrothermal reaction, the temperature of hydrothermal reaction is 60 ℃, the pressure is 1MPa, and the time is 24h;

[0041] The product obtained after the hydrothermal reaction was washed with deionized water, then suction filtered, a...

Embodiment 2

[0043] The corn stover with a silica content of 10% was pulverized to a particle size of 0.15 mm, washed with water, dried at 105 °C for 24 hours, heated at 500 °C for 2 hours, and carbonized; the obtained carbonized product was washed with water 8 times, Drying at 110°C for 24h to obtain biochar material;

[0044] The biochar material was put into an aqueous ferric nitrate solution with a mass concentration of 5 g / L, and the mass ratio of the biochar material to the ferric nitrate was 1:4, slowly stirred at 500 rpm for 24 hours, and added dropwise to the obtained mixed solution. Drop into the sodium hydroxide solution that concentration is 1mol / L, make the pH of solution be 12.03, transfer to the hydrothermal reaction still in 1min and carry out hydrothermal reaction, the temperature of hydrothermal reaction is 60 ℃, the pressure is 1MPa, and the time is 24h;

[0045] The product obtained after the hydrothermal reaction was washed with deionized water, then suction filtered,...

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Abstract

The invention provides an amorphous iron oxyhydroxide-biochar composite material and a preparation method thereof, and relates to the technical field of amorphous materials. The preparation method comprises the following steps: carbonizing biomass containing silicon dioxide to obtain a biochar material; and mixing the biochar material with an iron salt aqueous solution, and carrying out a hydrothermal reaction under an alkaline condition to obtain the amorphous iron oxyhydroxide-biochar composite material. Biomass rich in silicon dioxide is used as a raw material to prepare the porous biochar material, on one hand, the biochar material can be used as a carrier of a composite material, and on the other hand, silicon dioxide in the biochar material also provides a necessary silicon source for inhibiting crystallization of iron oxyhydroxide, so that the structural disorder of iron oxyhydroxide is ensured; the amorphous iron oxyhydroxide-biochar composite material is obtained. The preparation method is simple in process, the whole process is carried out in a water phase, and large-scale production and application are facilitated.

Description

technical field [0001] The invention relates to the technical field of amorphous materials, in particular to an amorphous iron oxyhydroxide-biochar composite material and a preparation method thereof. Background technique [0002] Nano-amorphous metal materials have been widely used in many fields such as environmental treatment and energy storage. Among them, iron-based amorphous materials have received extensive attention from researchers due to their wide sources, no secondary pollution, and high adsorption and catalytic efficiency. However, iron-based materials will crystallize and aggregate and grow during the reaction process, forming a certain crystal structure, thereby destroying their amorphous structure and reducing their efficiency. Therefore, the preparation of high-purity amorphous iron-based materials has always been the focus of researchers. At the same time, nanomaterials will also have agglomeration during the preparation process. Loading iron-based amorpho...

Claims

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Application Information

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IPC IPC(8): B01J23/745B01J32/00
CPCB01J23/745
Inventor 姚宏张旭田盛
Owner BEIJING JIAOTONG UNIV
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