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A kind of graphene oxide modified biochar material and its application

A technology of graphene modification and biochar, applied in other chemical processes, chemical instruments and methods, restoration of polluted soil, etc., can solve problems such as poor adsorption of heavy metals, lack of advantages in the type and quantity of functional groups on the surface of biochar, etc. Achieve large adsorption capacity, good adsorption and removal effect, and reduce environmental risks

Active Publication Date: 2021-11-02
YANGZHOU POLYTECHNIC COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the material itself, the type and quantity of functional groups on the surface of biochar do not have advantages, resulting in the general problem of poor adsorption of heavy metals in current biochar materials.

Method used

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  • A kind of graphene oxide modified biochar material and its application
  • A kind of graphene oxide modified biochar material and its application
  • A kind of graphene oxide modified biochar material and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of biochar material modified by graphene oxide, its preparation method comprises the steps:

[0028] (1) Preparation of biochar: rice straw and wheat straw were crushed to a particle size below 2mm, dried at 120°C and placed in N 2 In the atmosphere tube furnace, N 2 30min to form an oxygen-limited environment in the atmosphere furnace, and then at 10°C·min -1 Heat up to 500°C at a heating rate and keep it warm for 2 hours for pyrolysis. After the pyrolysis process is completed, continue to feed N 2 Naturally cool the biochar in the furnace to obtain straw biochar, grind it into a powder with a particle size below 2 mm, and set aside;

[0029] (2) Preparation of graphene suspension: Dissolve 1,3,6,8-pyrene tetrasulfonic acid tetrasodium salt into deionized water to prepare 1,3,6,8-pyrene with a concentration of 0.2 mg / mL Tetrasodium tetrasulfonic acid salt solution, adding graphene oxide to 1,3,6,8-pyrene tetrasulfonic acid tetrasodium salt solution, 1,3,6,8-p...

Embodiment 2

[0034] A kind of biochar material modified by graphene oxide, its preparation method comprises the steps:

[0035] (1) Preparation of biochar: rice straw and wheat straw were crushed to a particle size below 2mm, dried at 120°C and placed in N 2 In the atmosphere tube furnace, N 2 30min to form an oxygen-limited environment in the atmosphere furnace, and then at 10°C·min -1 The heating rate was heated to 530 °C and kept for 2 hours for pyrolysis. After the pyrolysis process was completed, the N 2 Naturally cool the biochar in the furnace to obtain straw biochar, grind it into a powder with a particle size below 2 mm, and set aside;

[0036](2) Preparation of graphene suspension: Dissolve 1,3,6,8-pyrene tetrasulfonic acid tetrasodium salt into deionized water to prepare 1,3,6,8-pyrene with a concentration of 0.2 mg / mL Tetrasodium tetrasulfonic acid salt solution, adding graphene oxide to 1,3,6,8-pyrene tetrasulfonic acid tetrasodium salt solution, 1,3,6,8-pyrene tetrasulfoni...

Embodiment 3

[0040] A kind of biochar material modified by graphene oxide, its preparation method comprises the steps:

[0041] (1) Preparation of biochar: rice straw and wheat straw were crushed to a particle size below 2mm, dried at 120°C and placed in N 2 In the atmosphere tube furnace, N 2 30min to form an oxygen-limited environment in the atmosphere furnace, and then at 10°C·min -1 The heating rate was heated to 550°C and kept for 1.5 hours for pyrolysis. After the pyrolysis process was completed, the N 2 Naturally cool the biochar in the furnace to obtain straw biochar, grind it into a powder with a particle size below 2 mm, and set aside;

[0042] (2) Preparation of graphene suspension: Dissolve 1,3,6,8-pyrene tetrasulfonic acid tetrasodium salt into deionized water to prepare 1,3,6,8-pyrene with a concentration of 0.2 mg / mL Tetrasodium tetrasulfonic acid salt solution, adding graphene oxide to 1,3,6,8-pyrene tetrasulfonic acid tetrasodium salt solution, 1,3,6,8-pyrene tetrasulfo...

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Abstract

The invention relates to a biochar material modified by graphene oxide, which belongs to the field of materials and environmental protection. Firstly, straw biochar is prepared, and then 1,3,6,8-pyrene tetrasulfonic acid tetrasodium salt solution is prepared, and graphite oxide is prepared Add ene to 1,3,6,8-pyrene tetrasulfonic acid tetrasodium salt aqueous solution, the mass ratio of 1,3,6,8-pyrene tetrasulfonic acid tetrasodium salt to graphene oxide is 1.8~2.5:1, The graphene suspension was obtained after ultrasonication, the straw biochar was impregnated into the graphene suspension, rinsed with deionized water, filtered, dried, and finally placed in N 2 In the air, slowly increase the temperature to 500-700°C, and pyrolyze for 0.5-3h to obtain it. The biochar material of the present invention has both the adsorption properties of biochar and graphene oxide, has the advantages of large adsorption capacity, high adsorption efficiency, etc., and has a good adsorption and removal effect on heavy metals in soil and other environments, and is especially suitable for biogas residue or heavy metal pollution. Passivation of heavy metals in soil.

Description

technical field [0001] The invention belongs to the field of materials and environmental protection, and in particular relates to a graphene oxide modified biochar material. Background technique [0002] In the past ten years, large-scale pig breeding in China has developed rapidly, but environmental pollution problems have followed. The ecological cycle agricultural model represented by "pig-biogas-vegetable (rice)" takes the biogas project as the link, and takes the biogas project products - biogas, biogas slurry and biogas residue treatment and utilization as the core, effectively solving the environment of pig manure and urine question. However, there are some potential environmental problems in the way of digesting biogas residues on agricultural land. For example, copper (Cu) and zinc (Zn) are the most widely existing heavy metal elements in pig feed, and they follow the ecological chain of "feed-pig manure-biogas residues". into the environment. At present, there a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/30B09C1/00
CPCB01J20/205B09C1/00
Inventor 马武生李霖张峰金根娣孙敏
Owner YANGZHOU POLYTECHNIC COLLEGE
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