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Preparation method and application method of phosphor-based modified charcoal

A biochar, modified technology, applied in the application, chemical instruments and methods, fertilizer mixtures and other directions, can solve the problems affecting the fertility effect of the preparation material, the stabilization ability of heavy metals, the effectiveness and reduction of the loss of phosphorus bases, and achieve stability. Chemical repair, simple use process, preparation method and simple process effect

Inactive Publication Date: 2019-04-09
HUATIAN ENG & TECH CORP MCC +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Public patents such as CN108359470A, CN104673337A, CN105948987A, and CN106732357A all use phosphoric acid or phosphate, nano-hydroxyapatite, human and animal feces, etc., and simply mix them with biochar preparation precursor materials, and then pyrolyze them to prepare modified biochar materials , but the high-temperature pyrolysis process may result in loss of phosphorus base or decrease in effectiveness, affecting the fertility of the prepared material and the ability to stabilize heavy metals

Method used

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  • Preparation method and application method of phosphor-based modified charcoal
  • Preparation method and application method of phosphor-based modified charcoal
  • Preparation method and application method of phosphor-based modified charcoal

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Effect test

Embodiment 1

[0030] This embodiment provides a phosphorus-based modified biochar material, which is mainly prepared by the following steps:

[0031] (1) Wash the agricultural surplus wheat straw material with deionized water, then dry it at 80°C for 24 hours, put it into a tube furnace for pyrolysis and firing after crushing, and inject N into the tube at a flow rate of 400mL / min. 2 Under anaerobic and 400°C conditions, pyrolyze for 6 hours to prepare the biochar, and then grind the biochar through a 60-mesh sieve to form a powder for later use;

[0032] (2) The preparation concentration is 10g / L potassium dihydrogen phosphate solution, and the mass fraction of hydrogen peroxide solution is diluted to 8%; the above potassium dihydrogen phosphate solution and hydrogen peroxide solution are mixed in a volume ratio of 2.5:1 to obtain a pretreatment solution;

[0033] (3) Fully mix the pretreatment solution obtained in (2) with the ground powdery biochar obtained in (1) according to a mass rat...

Embodiment 2

[0036] This embodiment provides a phosphorus-based modified biochar material, which is mainly prepared by the following steps:

[0037] (1) Wash the agricultural surplus wheat straw material with deionized water, then dry it at 80°C for 24 hours, put it into a tube furnace for pyrolysis and firing after crushing, and inject N into the tube at a flow rate of 400mL / min. 2 Under anaerobic and 300°C conditions, pyrolyze for 8 hours to prepare the biochar, and then grind the biochar through a 60-mesh sieve to form a powder for later use;

[0038] (2) The preparation concentration is 15g / L dipotassium hydrogen phosphate solution, and the mass fraction of hydrogen peroxide solution is diluted to 8.5%; the above dipotassium hydrogen phosphate solution and hydrogen peroxide solution are mixed in a volume ratio of 3:1 to obtain a pretreatment solution;

[0039] (3) Fully mix the pretreatment solution obtained in (2) with the ground powdered biochar obtained in (1) according to a mass ra...

Embodiment 3

[0042] This embodiment provides a phosphorus-based modified biochar material, which is mainly prepared by the following steps:

[0043] (1) Wash the agricultural surplus corn stalks with deionized water, then dry them at 80°C for 24 hours, put them into a tube furnace for pyrolysis and firing after crushing, and inject N into the tube at a flow rate of 400mL / min. 2 Under anaerobic and 600°C conditions, pyrolyze for 3 hours to prepare the biochar, and then grind the biochar through a 60-mesh sieve to form a powder for later use;

[0044] (2) The preparation concentration is 20g / L sodium dihydrogen phosphate solution, and the mass fraction of hydrogen peroxide solution is diluted to 9.0%; the above sodium dihydrogen phosphate solution and hydrogen peroxide solution are mixed in a volume ratio of 4:1 to obtain a pretreatment solution;

[0045] (3) Fully mix the pretreatment solution obtained in (2) with the ground powdered biochar obtained in (1) according to a mass ratio of 4:1,...

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Abstract

The invention discloses a preparation method and application method of phosphor-based modified charcoal. The preparation method comprises the following steps: preparing charcoal powder; mixing a phosphate solution and an oxidant solution in a preset volume ratio to obtain a pretreated solution; mixing the prepared charcoal powder and phosphate pretreated solution in a preset proportion; adding a catalyst into the mixed suspension to catalyze the oxidant to be decomposed to neutral; performing suction filtration and drying on the neutral mixed solution, and grinding into powder to obtain phosphor-based modified charcoal material. The preparation method has the advantages that the phosphor-based modified charcoal material has the characteristics of large specific surface area, more surface adsorption sites and easy combination with metal ions, has high adsorption efficiency and environmental friendliness, can realize stable repairing of heavy metal pollutants and effectively improve thesoil fertility quality; and the use process is simple, has relatively good adsorption stabilization effect on heavy metals in polluted soil, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of environmental functional materials and contaminated soil treatment, in particular to a preparation method and application of phosphorus-based modified biochar. Background technique [0002] Since the middle of the 20th century, with the development of industrial and agricultural production, the continuous acceleration of urbanization and the increasingly active human activities, heavy metal pollutants have been continuously brought into the soil environment, making the problem of soil heavy metal pollution widespread and increasing worldwide. serious. The "National Soil Pollution Survey Bulletin" released in 2014 also shows that the points of excessive pollution of inorganic heavy metals in soil in my country account for 82.8% of all the points of excessive pollution, which has become the main type of soil pollution. The heavy metals that pollute the soil mainly include mercury (Hg), cadmium (Cd), lead (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/02C09K101/00
CPCC09K17/02C09K2101/00
Inventor 李明安忠义朱巧红王浩刘金光王士权周建
Owner HUATIAN ENG & TECH CORP MCC
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