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Modified composite biochar, preparation method and applications thereof

A biochar modification technology, which is applied in chemical instruments and methods, water pollutants, and other chemical processes, can solve the problems of difficult recycling and low activity of biochar, and achieve increased porosity, easy recycling, and enhanced adsorption Effect

Inactive Publication Date: 2020-01-17
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problems of low activity of existing biochar and difficult recovery and regeneration, etc., and proposes a modified composite biochar and its preparation method as well as a method for using it to adsorb metal ions in water

Method used

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Examples

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Effect test

preparation example Construction

[0039] The preparation method of modified composite biochar of the present invention comprises the following steps:

[0040] 1. Biochar pretreatment: Take fresh straw, soak it in clean water to wash off the surface sediment, and cut it into an area of ​​about 5-10cm with scissors 2 Small pieces, washed twice with water and then washed twice with deionized water;

[0041] 2. Preparation of straw biochar: put the straw in a muffle furnace for high-temperature vacuum heating, where the temperature of the muffle furnace is set at 400-600°C, and the heating time is 30min-4h; wash the ash with deionized water, and filter until the filtrate is clear Transparent, dry at 105°C to constant weight to prepare straw biochar, crush it with a pulverizer to obtain powdery biochar, sieve the material with a 80-160 mesh standard sample sieve, take the undersieve and seal the bag for later use ; In this step, the straw is pyrolyzed under oxygen-limited or anoxic conditions (T<700°C) to obtain s...

Embodiment 1

[0049] Take fresh straw, soak it in clean water to wash off the sediment on the surface, and cut it into an area of ​​about 5-10cm with scissors 2 The small pieces were washed twice with clean water and then washed twice with deionized water; the straw was placed in a muffle furnace for high-temperature vacuum heating, wherein the temperature of the muffle furnace was set at 400°C, and the heating time was 2 hours; the straw was washed with deionized water Remove ash, filter with suction until the filtrate is clear and transparent, dry at 105°C to constant weight to prepare straw biochar, crush it with a pulverizer to obtain powdery biochar, sieve the material with a 100-mesh standard sample sieve, and take the sieve biochar. Seal the bag for later use; take 50g of potassium hydroxide and dissolve it in 1L of deionized water to prepare a potassium hydroxide solution with a concentration of 50g / L; weigh 40g of straw biochar into an Erlenmeyer flask and add 600mL of it to a conce...

Embodiment 2

[0052] Take fresh straw, soak it in clean water to wash off the sediment on the surface, and cut it into an area of ​​about 5-10cm with scissors 2 The small pieces were washed twice with clean water and then washed twice with deionized water; the straw was placed in a muffle furnace for high-temperature vacuum heating, wherein the temperature of the muffle furnace was set at 500 °C, and the heating time was 4 hours; the straw was washed with deionized water Remove ash, filter with suction until the filtrate is clear and transparent, dry at 105°C to constant weight to prepare straw biochar, crush it with a pulverizer to obtain powdery biochar, sieve the material with a 100-mesh standard sample sieve, and take the sieve biochar. Seal the bag for later use; take 80g of potassium hydroxide and dissolve it in 2L of deionized water to prepare a potassium hydroxide solution with a concentration of 40g / L; weigh 30g of straw biochar into an Erlenmeyer flask and add 1500mL of it to a con...

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Abstract

The invention belongs to the field of active carbon preparation, and particularly relates to modified composite biochar, a preparation method and applications thereof. The technical problem to be solved by the invention is to provide modified composite biochar, a preparation method and applications thereof. The preparation method comprises: A, carbonizing straws, washing off ash, drying, and crushing to obtain straw biochar; B, mixing the straw biochar, an alkali liquor, carrying out chemical modification, separation, washing the solid, and drying to obtain modified straw biochar; and C, carrying out compounding treatment: mixing the modified straw biochar, polyethylene glycol and water, adding MIEX, stirring, carrying out ultrasonic treatment, adding ascorbic acid or hydroxylamine, continuously stirring, adding a hydrogen peroxide solution, continuously stirring, separating, washing the solid, and drying to obtain the modified composite biochar. According to the method disclosed by the invention, the agricultural and forestry waste straw can be utilized to prepare the modified composite biochar with good adsorption performance.

Description

technical field [0001] The invention belongs to the field of activated carbon preparation, and in particular relates to a modified composite biochar, a preparation method thereof and an application of adsorbing metal ions. Background technique [0002] With the rapid advancement of industrialization, environmental governance has increasingly become an urgent problem to be solved. Wastewater discharged from industries such as smelting, chemical industry, printing and dyeing, textile and nuclear fuel cycle processes contains a large amount of heavy metal ions and other pollutants. If it is not treated, it will be discharged into the environment. It will seriously endanger human health, animals, plants and water safety. [0003] Compared with chemical precipitation, membrane treatment, ion exchange, photocatalysis, electrodeposition and other methods, adsorption method has the advantages of high efficiency, simple operation, cheap and no by-products, recyclable utilization and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/20C02F101/22
CPCB01J20/20C02F1/281C02F1/283C02F2101/20C02F2101/22C02F2101/203
Inventor 陈婷杨晓李道玉
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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