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Charcoal and preparation method and application thereof

A technology of biochar and wedelia, applied in the field of environmental engineering, to achieve the effect of excellent adsorption capacity and adsorption rate, small particle size and large specific surface area

Inactive Publication Date: 2017-08-22
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it has not been reported yet: using wedelia as raw material to prepare biochar to treat wastewater and achieve a win-win effect

Method used

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  • Charcoal and preparation method and application thereof
  • Charcoal and preparation method and application thereof
  • Charcoal and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A preparation method of wedelia biochar of the present invention comprises the following steps:

[0024] 1a) Collecting Wedelia chinensis, washing the collected Wedelia chinensis, drying at 105°C and crushing until the particle size is less than 0.15mm;

[0025] 1b) Place the wedelia powder in step 1a) in a tube-type resistance furnace for activation, set the temperature at 500°C, and activate it for 4 hours in a nitrogen-protected environment; after cooling to room temperature, take it out, and you can get the initial wedelia biochar. Taste;

[0026] 1c) Pulverize the primary product of the biochar described in step 1b) to a particle size of less than 0.15mm to obtain the South American Wedelia biochar (such as figure 1 shown).

Embodiment 2

[0028] A preparation method of wedelia biochar of the present invention comprises the following steps:

[0029] 1a) Collecting Wedelia chinensis, washing the collected Wedelia chinensis, drying at 105°C and crushing until the particle size is less than 0.15mm;

[0030] 1b) Place the wedelia powder in step 1a) in a tube-type resistance furnace for activation, set the temperature at 400°C, and activate it for 0.5h in a nitrogen-protected environment; take it out after cooling to room temperature, and you can get wedelia biochar first product;

[0031] 1c) The primary product of the biochar described in step 1b) is crushed to a particle size of less than 0.15mm to obtain the wedelia biochar.

Embodiment 3

[0033] A preparation method of wedelia biochar of the present invention comprises the following steps:

[0034] 1a) Collecting Wedelia chinensis, washing the collected Wedelia chinensis, drying at 105°C and crushing until the particle size is less than 0.15mm;

[0035] 1b) Put the wedelia powder in step 1a) in a tube-type resistance furnace for activation, set the temperature at 700°C, and activate it for 24 hours in a nitrogen-protected environment; after cooling to room temperature, take it out, and you can get the primary wedelia biochar. Taste;

[0036] 1c) The primary product of the biochar described in step 1b) is crushed to a particle size of less than 0.15mm to obtain the wedelia biochar.

[0037] Carry out morphology analysis (scanning electron microscope) to Wedelia biochar in Examples 1~3, the morphology structure of Wedelia biochar is as follows figure 2 As shown, it can be seen that the surface of the Wedelia biochar has porous and tube structure; the infrared ...

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Abstract

The invention discloses a biochar and its preparation method and application. The biochar is prepared by using Wedelia chinensis as a raw material. The preparation method is as follows: cleaning, drying and pulverizing the wedelia chinensis; placing the wedelia chinensis powder in nitrogen gas, The temperature for activation of Wedelia powder is 400-700°C, and the activation time is 0.5-10 hours; cooling to obtain the primary product of biochar; crushing the primary product of biochar to obtain biochar; the operation method of biochar to reduce cadmium in wastewater is: wastewater The concentration of cadmium in the medium is 10-550mg / L, the pH value of the wastewater is 2-8, the dosage of biochar is 0.5-1.5mg / mL, the adsorption time is 5min-24h, the temperature is 25°C, and the oscillation rate is 250rpm. The biological charcoal of the present invention is prepared by using the Wedelia chinensis as a raw material, which can not only absorb heavy metals in wastewater, but also eliminate the invasion hazard caused by the Wedelia chinensis; meanwhile, the wedelia chinensis biochar has a strong ability to adsorb cadmium.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a biochar and its preparation method and application. Background technique [0002] Cadmium is a heavy metal with high solubility and strong toxicity. Cadmium can be enriched in the body and enter the human body through the food chain to cause chronic poisoning, anemia, osteoporosis and kidney damage and a series of diseases. However, cadmium is a raw material used in industry and agriculture. It is widely used in electroplating, alloys, pesticides, and battery manufacturing. It enters the environment in the form of "three wastes", resulting in serious pollution of cadmium. Therefore, the problem of cadmium pollution in the environment needs to be solved urgently. [0003] Biochar is an environmentally friendly material. Due to its large specific surface area and microporous structure, it can significantly adsorb heavy metals in water. At the same t...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/20
CPCB01J20/20C02F1/283C02F2101/20
Inventor 邓红梅黄楚杨李玉婵梁欣欣梁官成罗梦婷陈永亨
Owner GUANGZHOU UNIVERSITY
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