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A kind of biochar composite material and preparation method thereof

A composite material, biochar technology, applied in chemical instruments and methods, other chemical processes, alkali metal compounds, etc., can solve problems such as limited adsorption capacity, and achieve the effects of convenient operation, rich surface active groups, and huge specific surface area.

Active Publication Date: 2019-06-14
INST OF BAST FIBER CROPS CHINESE ACADEMY OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Because the surface of natural agricultural and forestry wastes contains less active functional groups, the prepared biochar has limited adsorption capacity for some pollutants.

Method used

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  • A kind of biochar composite material and preparation method thereof
  • A kind of biochar composite material and preparation method thereof
  • A kind of biochar composite material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0031] A kind of preparation method of biochar composite material of the present invention:

[0032] The peeled stems of ramie were dried at room temperature, pulverized by a pulverizer and then ground, passed through a 100-mesh sieve, and a sodium humate solution with a mass concentration range of 5 g / L was prepared, and filtered after ultrasonication for 20 minutes to remove insoluble matter; 50 g of ramie stems After soaking the powder in 1000mL sodium humate solution with a mass concentration range of 5g / L for 1-5h, dry it at 80°C, put it into a tube furnace for pyrolysis, feed nitrogen at a flow rate of 100mL / min, and Raise the temperature to 500°C at a speed of 1 / min, keep pyrolysis for 2 hours after the temperature rises to 500°C, and cool the obtained product to room temperature under the condition of continuing to maintain nitrogen flow, then repeatedly wash with deionized water, and then pass through 200 sieves after grinding , and dried at 70°C for 5 hours to prepar...

Embodiment 2

[0036] The biochar composite material of the present invention is used in the field of water treatment to remove heavy metal ions in water, comprising the following steps:

[0037] Get ten volumes and be 50mL, the initial concentration is the hexavalent chromium wastewater sample to be treated of 100mg / L, adjust the pH value to 3 with nitric acid or sodium hydroxide, add the biochar magnetic composite material that embodiment 1 makes to wastewater sample In this process, the amount added per liter of waste water is 2g based on the weight of the biochar composite material. The reactor is placed in a constant temperature water bath shaking box with a rotation speed of 150rpm, and the temperature is kept at 30°C. Shake for 5min, 10min, 30min, 1h, 3h , After 6h, 9h, 12h, 18h, and 24h, the biochar composite material is separated from the solution to complete the treatment of hexavalent chromium wastewater. The concentration of the remaining hexavalent chromium in the solution is me...

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Abstract

The invention relates to a biochar composite material and a preparation method thereof. The method comprises the following steps: firstly, preparing ramie stem powder; utilizing sodium humate to modify and carbonize, thereby preparing a biochar modified material; and loading magnetic particles onto the surface of the biochar modified material, thereby obtaining the biochar composite material. The prepared biochar composite material has better physicochemical properties and easiness in solid-liquid separation and reutilization. The prepared biochar composite material provided by the invention has a huge specific surface area, and the surface contains rich activegroups, so that the biochar composite material can be applied to various fields, and a more extensive approach is supplied for the reutilization of ramie.

Description

technical field [0001] The invention belongs to the field of functional materials, and in particular relates to a biochar composite material and a preparation method thereof. Background technique [0002] Biochar is a stable carbon-rich product formed by pyrolysis of biomass such as agricultural and forestry wastes under anoxic conditions. In recent years, under the macro background of climate change, environmental pollution, energy shortage, food crisis and sustainable agricultural development, the potential application value and application space of biochar have been further expanded. During the preparation process of biochar, a large number of stable and highly aromatic porous structures are usually formed. The microporous structure is developed, the specific surface area is large, and the surface contains a variety of functional groups such as carbonyl, carboxyl, phenolic hydroxyl, lactone, etc., so it has With strong adsorption capacity, it can adsorb and remove metal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30
CPCB01J20/0229B01J20/0288B01J20/20B01J20/28009
Inventor 王慧王玉富郭媛邱财生龙松华郝冬梅钟国乾许雯雯
Owner INST OF BAST FIBER CROPS CHINESE ACADEMY OF AGRI SCI
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