Preparation method and application of a magnesium oxide-rice husk biochar composite material

A composite material and magnesium oxide technology are applied in the field of preparation of magnesium oxide-rice husk biochar composite materials, and can solve the problems of low heavy metal pollution adsorption capacity, difficulty in reducing the bioavailability of heavy metals, and low content of biochar mineral components. To achieve the effect of improving the adsorption effect, reducing the cost of environmental remediation, and reducing the cost of materials

Active Publication Date: 2021-11-02
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the deficiencies and shortcomings of the low content of biochar mineral components in the prior art, low adsorption capacity for heavy metal pollution, and difficulty in reducing the bioavailability of heavy metals, the primary purpose of the present invention is to provide a kind of magnesium oxide-rice husk biochar Preparation method of composite material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Take fresh rice husks, wash them and dry them in an oven at 85°C for 16 hours, grind them through a 10-mesh sieve, put them in a vacuum tube furnace, heat them up to 350°C at a rate of 5°C / min, keep them warm for 4 hours, and cool them naturally to room temperature, washed with water three times, and then dried to constant weight to obtain rice husk biochar.

[0020] (2) Add 19.4g of rice husk biochar to 100mL of 0.6% magnesia suspension, ultrasonically react for 1h, place in an oven at 105°C for 20h, and then transfer to a vacuum tube furnace for heat treatment at 350°C for 30min to obtain magnesia-rice husk biochar carbon composites.

[0021] (3) Get 100mL of Cd-containing wastewater, adjust the pH value to 5.0, add 0.3g of the magnesium oxide-biochar composite material, shock and adsorb for 24h, utilize atomic absorption spectrophotometry to measure the mass concentration of Cd before and after adsorption, and Cd is obtained by 200mg / L dropped to 2.83mg / L, and ...

Embodiment 2

[0024] (1) Take fresh rice husks, wash and dry in an oven at 80°C for 16 hours, grind them through a 30-mesh sieve, put them in a vacuum tube furnace, heat them up to 400°C at a rate of 8°C / min, keep them warm for 2 hours, and cool them naturally to room temperature, washed twice with water, and then dried to constant weight to obtain rice husk biochar.

[0025] (2) Add 19g of rice husk biochar to 100mL of 1% magnesia suspension, ultrasonically react for 1h, place in a 90°C oven for 20h, and then transfer to a vacuum tube furnace for heat treatment at 400°C for 20min to obtain magnesia-rice husk biochar composite material.

[0026] (3) Get 100mL of Cd-containing wastewater, adjust the pH value to 7.0, add 0.8g of the magnesium oxide-biochar composite material, shock and adsorb for 24h, utilize atomic absorption spectrophotometry to measure the mass concentration of Cd before and after adsorption, and Cd is obtained by 200mg / L dropped to 0.08mg / L, and the removal rate was 99....

Embodiment 3

[0029] (1) Take fresh rice husks, wash them and dry them in an oven at 90°C for 10 hours, grind them through a 20-mesh sieve, put them in a vacuum tube furnace, heat them up to 350°C at a rate of 3°C / min, keep them warm for 3 hours, and cool them naturally to room temperature, washed twice with water, and then dried to constant weight to obtain rice husk biochar.

[0030] (2) Add 18g of rice husk biochar to 100mL of 2% magnesia suspension, ultrasonically react for 1h, place in an oven at 85°C for 24h, and then transfer to a vacuum tube furnace for heat treatment at 300°C for 60min to obtain magnesia-rice husk biochar composite material.

[0031] (3) Get 100mL of Cd-containing wastewater, adjust the pH value to 5.0, add 0.8g of the magnesium oxide-biochar composite material, shock and adsorb for 20h, utilize atomic absorption spectrophotometry to measure the mass concentration of Cd before and after adsorption, and Cd is obtained by 200mg / L dropped to 2.06mg / L, and the remova...

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Abstract

The invention belongs to the technical field of water body and soil pollution remediation, and discloses a magnesium oxide-rice husk biochar composite material and a preparation method and application thereof. The preparation method includes the steps of: washing the rice husks, drying them at 80-90°C for 10-16 hours, crushing them and sieving them, and raising the temperature to 300°C at a rate of 3-8°C / min under nitrogen and anaerobic conditions. ‑400°C, pyrolysis for 2‑4h, naturally cooled to room temperature, washed and dried to constant weight to obtain rice husk biochar; adding rice husk biochar to 0.6‑3% magnesium oxide suspension by mass fraction to obtain a mixed material ; After stirring and mixing, ultrasonically react for 1-2h, place it at 85-105°C for 20-24h, and then pass N 2 Heat treatment at 300-400°C for 20-60 minutes under the same conditions to obtain magnesium oxide-rice husk biochar composite material. The composite material can be applied to adsorb and remove cadmium in cadmium polluted wastewater or cadmium in cadmium polluted soil.

Description

technical field [0001] The invention belongs to the technical field of water body and soil pollution remediation, and in particular relates to a preparation method and application of a magnesium oxide-rice husk biochar composite material. Background technique [0002] In mid-April 2014, the Ministry of Environmental Protection and the Ministry of Land and Resources released the National Soil Pollution Survey Bulletin. The survey results show that the overall situation of the soil environment in the country is not optimistic. Some areas have serious soil pollution, the soil environment quality of cultivated land is worrying, and the soil environment problems of industrial and mining wasteland are prominent. The total point exceeding standard rate of the national soil is 16.1%, among which Cd is the primary soil pollutant, and the point exceeding standard rate accounts for 7.0%. It is one of the most toxic heavy metal elements in the environment. The characteristics of absorp...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28B09C1/00
CPCB01J20/041B01J20/20B09C1/00C02F1/28C02F1/281C02F1/283
Inventor林亲铁项江欣莫海文郑秋岳郭见龙
OwnerGUANGDONG UNIV OF TECH