Graphene-based acidified soil conditioner

A soil conditioner and graphene technology, applied in the direction of soil conditioning materials, other chemical processes, chemical instruments and methods, etc., can solve the problems of biological matrix damage, weak soil acidification resistance, and inability to increase biological activity, so as to improve the resistance Acidification ability, speed up the improvement speed, and the effect of improving the soil environment

Inactive Publication Date: 2021-05-04
WEIFANG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] Although graphene oxide composite materials can absorb heavy metals to a greater extent and improve the soil environment, this soil conditioner is a chemical conditioner. Although it can regulate the soil environment, the biological matrix in the soil has been destroyed. A composite material cannot maximize the biological activity in the soil, and the soil's anti-acidification ability is also weak

Method used

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Experimental program
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preparation example Construction

[0018] (2) Preparation of graphene: use electrochemical method to make graphene, and dry it at 80°C for subsequent use;

[0019] (3) Preparation of magnetic graphene oxide composite material: take 0.5g graphene oxide and add it to 300ml deionized water, and ultrasonically for 1.5h to obtain solution A;

[0020] Weigh FeSO with a molar ratio of 1:2 4 ·7H 2 O, FeCl 3 ·6H 2 O is dissolved in deionized water to obtain solution B;

[0021] Slowly add solution B into solution A, keep the temperature at 90°C, add 1M sodium hydroxide while stirring until pH = 10.0±0.2, then heat and stir for 2 hours, cool at room temperature for 2 hours, and then wash with absolute ethanol and deionized water. And use a centrifuge to collect the precipitate for later use;

[0022] (4) Preparation of soil conditioner: Add acidophilus powder to the magnetic graphene oxide collected by centrifugation, the addition ratio is 1:0.5 by mass ratio of magnetic graphene oxide and acidophilus powder, stir a...

Embodiment 1

[0023] Embodiment 1: the screening method of acidophilus in the step (1): Utilize environmental microorganism technology (see publication number is CN109055277A a kind of method for screening acidophilus heavy metal nitrogen-fixing bacteria from soil), screen out a kind of acidophilus , You can also directly buy soil acidophilus powder for use.

Embodiment 2

[0025] Adsorption experiment of heavy metals by soil conditioner

[0026] Due to the water-soluble Pb in the collected soil samples 2+ and Cd 2+ The content is too low to reasonably judge the effect of the adsorption material on the heavy metal Pb 2+ and Cd 2+ Adsorption performance is good or bad, so we self-prepared high concentration of heavy metal Pb 2+ and Cd 2+ Mud, research soil conditioner on water soluble heavy metal Pb 2+ and Cd 2+ removal effect.

[0027] Pb 2+ Preparation of mud: air-dry the blank soil, pass through a 60-mesh sieve, and add Pb at a concentration of 1000mg / L 2+ Solution, with soil: the mass ratio of water is the ratio of 1:1, stirs 24h in the ball mill, obtains Pb 2+ mud.

[0028] Cd 2+ Preparation of mud: After the blank soil is air-dried, pass through a 60-mesh sieve, and add 500mg / L concentration of Cd 2+ Solution, with soil: the mass ratio of water is the ratio of 1:1, stirs 24h in the ball mill, obtains Cd 2+ mud.

[0029] All mud...

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Abstract

The invention discloses a graphene-based acidified soil conditioner which is prepared by the following steps: (1) separation of acidophilic bacteria; (2) preparation of graphene; (3) preparation of a magnetic graphene oxide composite material; (4) preparation of the soil conditioner: adding acidophilic bacteria powder into centrifugally collected magnetic graphene oxide; the mass ratio of the magnetic graphene oxide to the acidophilic bacteria powder is 1: 0.5, stirring at normal temperature, dispersing for 0.5 hour at normal temperature through an ultrasonic cleaner, freeze-drying to obtain powder, and sealing for later use. Graphene is used as a base material, acidophilic bacteria are fused, heavy metal is adsorbed, the soil environment is improved, the improvement speed of acid soil is increased, and the acidification resistance of the soil is improved.

Description

technical field [0001] The invention relates to the technical field of acidified soil conditioners, in particular to a graphene-based acidified soil conditioner. Background technique [0002] Soil acidification will not only lead to substantial crop yield reduction or even failure, but also promote the absorption and accumulation of harmful substances such as heavy metals in agricultural products, threatening national food security and public health. At present, quicklime and lime nitrogen are mostly used to improve acidified soil, but when quicklime is sprinkled into acidic soil, it will violently release heat, accelerate the decomposition of organic matter in the soil, cause soil compaction, and affect the absorption of phosphorus and trace elements by crops. Reducing the fertility of the soil will also affect the growth of microorganisms in the soil and affect the organic matter of the soil. And quicklime also contains a large amount of heavy metal elements, which will c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40C09K109/00
CPCC09K17/40C09K2109/00
Inventor 冯棣张敬敏祝海燕
Owner WEIFANG UNIV OF SCI & TECH
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