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Method for repairing Cd and Cu pollution by using biochar prepared from invasive plant bidens pilosa

A technology of ghost needle grass and invasive plants, which is applied in the field of preparing biochar to repair Cd and Cu polluted water bodies, can solve the problems of weak adsorption capacity, no heavy metal adsorption capacity, and limited effect of heavy metal treatment, achieving remarkable results, The effect of significant application value

Inactive Publication Date: 2020-02-21
SOUTH CHINA AGRI UNIV
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  • Claims
  • Application Information

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Problems solved by technology

However, biochar prepared by commonly used raw materials and technologies currently has very limited effects on the treatment of heavy metals in water and soil. Chinese invention patent CN200710119645.7 discloses a water-purifying activated carbon made of plant waste, which has strong decolorization and deodorization capabilities. , but does not have heavy metal adsorption capacity; Chinese patent CN201410254402.4 discloses a method of using Spartina alterniflora-based biochar to treat copper-containing wastewater. The maximum adsorption capacity of Spartina alterniflora-based biochar for heavy metal copper is 90mg / g; Chinese patent 201410562485.3 discloses an adsorbent for removing cadmium in wastewater. After removing impurities and air-drying water hyacinth in non-polluted waters, it is dried and pulverized into powder, and placed in an atmosphere furnace for oxygen-limited pyrolysis to obtain water hyacinth biochar. The maximum adsorption capacity of cadmium in the water hyacinth-based biochar can reach 80 mg / g; Chinese patent 201610650186.4 discloses a water hyacinth biochar, and the crushed water hyacinth is pyrolyzed at 200-400 °C in a low-temperature oxygen-limited environment for 4-4~ 8h, then the pyrolysis product was crushed, sieved, and preserved to produce water hyacinth biochar. The biochar prepared by it had a maximum adsorption capacity of 57.2mg / g of copper, but the above-mentioned biochar disclosed above had no effect on metal copper or cadmium. The adsorption capacity is not strong

Method used

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  • Method for repairing Cd and Cu pollution by using biochar prepared from invasive plant bidens pilosa
  • Method for repairing Cd and Cu pollution by using biochar prepared from invasive plant bidens pilosa
  • Method for repairing Cd and Cu pollution by using biochar prepared from invasive plant bidens pilosa

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Embodiment 1

[0034] The preparation method of embodiment 1 invasive plant ghost needle grass bioactivated carbon

[0035] (1) Collection: collect the invasive plant P. trifoliate and air-dry it naturally for a week, then dry it in an oven at 80°C for 48 hours until dry, and use a universal grinder to crush and store it for later use;

[0036] (2) Preparation: Use the oxygen-limited temperature-rising carbonization method to weigh the pulverized product obtained in step (1), weigh 10.0 g of the pulverized product and put it into the muffle furnace, and inject nitrogen gas for 5 minutes to make the container in an oxygen-deficient state , burned under oxygen-limited conditions at 500°C, and started timing when it rose to the set temperature. After 3 hours of constant temperature pyrolysis, it was cooled to room temperature and taken out; the yield of biochar obtained under different carbonization conditions was calculated by the following formula. In the formula, Y is the yield of biochar (%...

Embodiment 2

[0040] Example 2 Solid-to-liquid ratio adsorption of Cd by biochar of the invasive plant Ghost needlewort 2+ 、Cu 2+ Impact

[0041] The embodiment of the present invention restores the polluted water bodies containing Cd and Cu respectively with different solid-to-liquid ratios, comprising the following steps:

[0042](1) Weigh 0.01, 0.02, 0.03, 0.04, 0.08, 0.12, 0.16g biochar samples in 50mL centrifuge tube, add 40 mL of Cd with an initial concentration of 20 mg / L 2+ solution. Shake at 150r / min for 24h in a constant temperature shaking box at 25°C, then pass through a 0.45μm microporous membrane, and measure the Cd in the supernatant with a flame atomic absorption spectrometer 2+ concentration;

[0043] (2) Weigh 0.01, 0.02, 0.03, 0.04, 0.08, 0.12, 0.16g biochar samples in 50mL centrifuge tube, add 40mL of Cu with an initial concentration of 20mg / L 2+ solution. Shake at 150r / min for 30h in a constant temperature shaking box at 25°C, then pass through a 0.45μm micropor...

Embodiment 3

[0046] Example 3 Effect of the initial pH of the solution on the adsorption of Cd by biochar of the invasive plant Ghost needlewort 2+ 、Cu 2+ Impact

[0047] The embodiment of the present invention repairs the polluted water containing Cd and Cu respectively with different initial pH of the solution, including the following steps:

[0048] (1) Weigh 0.02g of biochar into a 50mL round bottom centrifuge tube, add 40mL of Cd with a concentration of 20mg / L 2+ Solution, add a small amount of dilute HCl and NaOH solution dropwise to adjust the pH to 2, 3, 4, 5, 6, 7. Shake at 150r / min for 24h in a constant temperature shaking box at 25°C, then pass through a 0.45μm microporous membrane, and measure the Cd in the supernatant with a flame atomic absorption spectrometer 2+ concentration;

[0049] (2) Weigh 0.04g of biochar into a 50mL round bottom centrifuge tube, add 40mL of Cu with a concentration of 20mg / L 2+ Solution, add a small amount of dilute HCl and NaOH solution dropwise...

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Abstract

The invention relates to a method for repairing Cd and Cu pollution by using biochar prepared from invasive plant bidens pilosa. The method comprises: S1, drying an invasive plant bidens pilosa, crushing, putting into a muffle furnace, and pyrolyzing at 300-700 DEG C in a nitrogen atmosphere for 2-4 h to obtain biochar; S2, weighing the biochar prepared in the step S1, crushing, sieving, and selecting 40-60 mesh biochar powder; and S3, applying the regulating biochar to a water body polluted by Cd and Cu so as to effectively reduce the contents of heavy metals Cd and Cu in the aqueous solution. According to the invention, the method can simultaneously solve the two problems of invasive plants and heavy metals, has significance in restoring of healthy ecological environments, and has important application value.

Description

technical field [0001] The invention relates to the technical field of harmful biological resources, and more specifically, relates to a method for preparing biochar by using the invasive plant P. trifoliate to restore Cd and Cu polluted water bodies. Background technique [0002] Due to human mining, smelting and processing, mine oil exploitation, fishery industry development, chemical production and other industrial activities, wastewater containing heavy metals is discharged into the water environment, causing serious heavy metal pollution. [0003] The invasion of alien plants has become a global ecological and environmental problem. After its successful invasion, it poses a serious threat to the local biodiversity, the structure and function of the ecosystem, social economy and human health. It is currently the most difficult problem facing mankind one of the environmental problems. Bidens pilosa L. of the family Asteraceae is a common invasive weed in habitats such as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/20
CPCB01J20/20C02F1/281C02F2101/20
Inventor 章家恩赵敏赵本良全国明
Owner SOUTH CHINA AGRI UNIV
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