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A kind of modified biochar, soil remediation agent and its preparation method and application

A soil remediation agent and biochar technology, which is applied in the restoration of polluted soil, application, soil conditioning materials, etc., can solve the problems of heavy metal-pesticide compound pollution, reduce the toxicity of pesticide-heavy metal compound pollution, low preparation cost, The effect of blocking transfer

Active Publication Date: 2021-03-02
QINGDAO AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These production methods lead to the combined pollution of heavy metals and pesticides, and the remediation of multiple polluted soils has become a research hotspot in the field of environmental science.

Method used

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  • A kind of modified biochar, soil remediation agent and its preparation method and application
  • A kind of modified biochar, soil remediation agent and its preparation method and application
  • A kind of modified biochar, soil remediation agent and its preparation method and application

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preparation example Construction

[0032] The present invention also provides a method for preparing the modified biochar described in the above technical solution, comprising: mixing the corn stalks, graphene oxide suspension, nano-SiO 2 Suspension and CaCl 2 After the solutions are mixed, carry out hydrothermal carbonization treatment to obtain hydrated carbon; dry the hydrated carbon to obtain modified biochar; the temperature of the hydrothermal carbonization treatment is 180-200°C; the time of the hydrothermal carbonization treatment For 16 ~ 20h.

[0033]In the present invention, the corn stalks are preferably crushed to obtain corn stalk powder. The method of crushing the corn stalks is not particularly limited in the present invention, and the corn stalks are preferably washed with water, air-dried and then crushed, and the particle size of the corn stalk powder obtained after the crushing is ≤250 μm.

[0034] In the present invention, there is no special limitation on the mixing method. Ultrasonic mi...

Embodiment 1

[0064] The preparation method of modified biochar:

[0065] (1) Wash the corn stalks with deionized water, air-dry, pulverize, and pass through a 60-mesh sieve;

[0066] (2) Preparation of 1% graphene oxide (GO) suspension: Dissolve 1 g of powdered GO in 100 ml of deionized water, and ultrasonically disperse in an ultrasonic disperser for 30 min to obtain a uniformly dispersed 1% GO suspension;

[0067] (3) 2% Nano SiO 2 Suspension preparation: 1g nano-SiO 2 Add it to 50ml of deionized water, move it into an ultrasonic disperser and disperse ultrasonically for 30 minutes to obtain 2% nano-SiO 2 suspension;

[0068] (4) 1.5% CaCl 2 Solution preparation: 1.5g CaCl 2 Add to 100ml deionized water and mix well to get 1.5% CaCl 2 solution;

[0069] (5) 50g of corn stalk powder, 20ml of 1% GO suspension, 2% nano-SiO 2 Suspension 15ml, 1.5% CaCl 2 25ml of the solution was mixed evenly, ultrasonically dispersed for 45min, transferred to a hydrothermal synthesis reactor, sealed...

Embodiment 2

[0073]The preparation method of modified biochar:

[0074] 50g of corn stalk powder, 10ml of 1% GO suspension, 2% nano-SiO 2 Suspension 25ml, 1.5% CaC l2 Mix 15ml of the solution evenly, disperse it ultrasonically for 30min, transfer it to a hydrothermal synthesis reactor, seal it, and react at a constant temperature of 180°C for 20h. After cooling to room temperature, take out the solid phase product, and then place it in an oven at 80°C for drying treatment. After drying for 16h, you can get Modified biochar GO / Si / Ca / BC. Corn straw powder, 1% GO suspension, 2% nano-SiO 2 Suspension and 1.5% CaCl 2 The preparation method of solution is identical with embodiment 1.

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Abstract

The invention provides a modified biochar, a soil remediation agent, a preparation method and application thereof, and relates to the technical field of biochar. The modified biochar provided by the present invention consists of corn stalks, graphene oxide suspension, nano-SiO 2 Suspension and CaCl 2 solution prepared; the quality of the corn stalks and graphene oxide suspension, nano-SiO 2 Suspension, CaCl 2 The volume ratio of the solution is (45~55)g:(10~20)mL:(15~25)mL:(15~25)mL. The modified biochar provided by the invention has porosity and a large specific surface area, has good adsorption capacity, and can effectively reduce the activity of soil heavy metals and organic pollutants in soil.

Description

technical field [0001] The invention relates to the technical field of biochar, in particular to a modified biochar, a soil remediation agent and a preparation method and application thereof. Background technique [0002] Atrazine (AT), because of its excellent herbicidal effect and low price, has been widely used and promoted in countries all over the world. Because AT has the characteristics of refractory degradation and long persistence in soil, it is easy to cause harm to the environment and human beings, and has hidden phytotoxicity to subsequent crops, which has caused widespread public concern about its pollution and prevention. [0003] In addition, with the continuous development of industry and agriculture, the frequent use of sewage irrigation, pesticides and fertilizers containing heavy metals, etc., has caused an increasing amount of heavy metals to enter the environment, further deteriorating the environment. These production methods lead to heavy metal-pestic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40B01J20/20B01J20/30B09C1/08B09C1/10C09K109/00
CPCB01J20/20B09C1/08B09C1/10C09K17/40C09K2109/00
Inventor 宋宁宁宗海英
Owner QINGDAO AGRI UNIV
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