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Preparation method and application of modified biochar composite modified with magnetic hydrotalcite

A technology of magnetic hydrotalcite and composite materials, which is applied in the direction of water pollutants, chemical instruments and methods, alkali metal compounds, etc., can solve the problems of low separation efficiency, achieve a large specific surface area, enhance the ability to adsorb ammonia nitrogen, and achieve good results

Active Publication Date: 2019-03-22
郗丹
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Hydrotalcite is a layered columnar double metal hydroxide, and its ideal structure is Mg 6 al 2 (OH) 16 CO 3 4H 2 O, is a naturally occurring mineral with a structure similar to brucite (Mg(OH) 2 ,Brucite), by MgO 6 The octahedron shared edges to form a unit layer, and the Mg on the lamina 2+ Al 3+ Isomorphic substitution makes the laminates positively charged, and the exchangeable CO in the interlayer 3 2- It is balanced with the positive charge on the laminate, so that the overall structure of LDH is electrically neutral; the special structure of LDH determines its special properties, so that it can be widely used in many fields; among them, alkaline and interlayer anions The exchangeability makes it show a certain adsorption capacity, but its separation efficiency is low

Method used

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  • Preparation method and application of modified biochar composite modified with magnetic hydrotalcite
  • Preparation method and application of modified biochar composite modified with magnetic hydrotalcite
  • Preparation method and application of modified biochar composite modified with magnetic hydrotalcite

Examples

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Embodiment 1

[0040] A preparation method of a modified biochar composite material modified by magnetic hydrotalcite, comprising the steps of:

[0041]S1. Clean the biomass raw material with deionized water, then put it into a biochar furnace, and perform a pre-pyrolysis reaction at 500°C to prepare biochar, and grind it through an 80-mesh sieve for later use;

[0042] S2, soak the biochar prepared in the above steps in 1mol / L NaOH solution, take it out after 24h, then wash with deionized water until neutral, and dry;

[0043] S3, pyrolyzing the product obtained in the above steps again, setting the temperature at 500°C, washing with deionized water until neutral, and drying;

[0044] S4, the product that above-mentioned step is made soaks in 1mol / L MgCl 2 Mg in solution for 24h 2+ modified, then taken out, washed with deionized water until neutral, and dried to obtain modified biochar;

[0045] S5, take Fe(NO 3 ) 2 ·6H 2 O, Fe(NO3) 3 9H 2 O and NaOH aqueous solution preparation sol...

Embodiment 2

[0052] A preparation method of a modified biochar composite material modified by magnetic hydrotalcite, comprising the steps of:

[0053] S1. Wash the raw material of walnut shell biomass with deionized water, then put it into a biochar furnace, perform a pre-pyrolysis reaction to prepare biochar, and grind it through an 80-mesh sieve for later use;

[0054] S2, soak the biochar prepared in the above steps in 1mol / L NaOH solution, take it out after 24h, then wash with deionized water until neutral, and dry;

[0055] S3, pyrolyzing the product obtained in the above steps again, then washing with deionized water to neutrality, and drying;

[0056] S4, the product that above-mentioned step is made soaks in 1mol / L MgCl 2 Mg in solution for 24h 2+ modified, then taken out, washed with deionized water until neutral, and dried to obtain modified biochar;

[0057] S5, take Fe(NO 3 ) 2 ·6H 2 O, Fe(NO3) 3 9H 2 O and NaOH aqueous solution preparation solution A; take Ca(NO 3 ) ...

Embodiment 3

[0066] A preparation method of a modified biochar composite material modified by magnetic hydrotalcite, comprising the steps of:

[0067] S1. Wash the raw material of walnut shell biomass with deionized water, then put it into a biochar furnace, perform a pre-pyrolysis reaction at 500°C to prepare biochar, and grind it through an 80-mesh sieve for later use;

[0068] S2, soak the biochar prepared in the above steps in 1mol / L NaOH solution, take it out after 24h, then wash with deionized water until neutral, and dry;

[0069] S3, pyrolyzing the product obtained in the above steps again, setting the temperature at 500°C, washing with deionized water until neutral, and drying;

[0070] S4, the product that above-mentioned step is made soaks in 1mol / L MgCl 2 Mg in solution for 24h 2+ modified, then taken out, washed with deionized water until neutral, and dried to obtain modified biochar;

[0071] S5, take Fe(NO 3 ) 2 ·6H 2 O, Fe(NO3) 3 9H 2 O and NaOH aqueous solution pre...

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Abstract

The invention discloses a preparation method and an application of a modified biochar composite modified with magnetic hydrotalcite. According to the composite, modified biochar is taken as a substrate, magnetic Ca / Al hydrotalcite is supported on the substrate surface, the biomass raw materials are widely sourced, non-toxic and cheap, biomass is pre-modified with alkali and subjected to high-temperature pyrolysis and Mg<2+> supporting modification, so that surface functional groups of the biomass are activated, content of the surface functional groups is increased, hydrophilicity is improved,and ammonia nitrogen adsorption efficiency of the biochar is increased greatly; further by means of compositing and synergy of the modified biochar and the magnetic hydrotalcite, the adsorption efficiency of the composite is increased greatly, a magnetic core can be recycled repeatedly, so that cost is reduced, and secondary pollution to the environment is reduced.

Description

technical field [0001] The invention relates to the technical field of water body eutrophication treatment, in particular to a preparation method and application of a modified biochar composite material modified by magnetic hydrotalcite. Background technique [0002] Water is the source of life, an important resource for the survival of all life including human beings, and the most important part of organisms; the total fresh water resources in my country are about 28000×108m 3 , accounting for 6% of the world's water resources, ranking sixth in the world; but because of the large population, my country's per capita water resources are only 2300m 3 , is 1 / 4 of the world's per capita, ranking 121st in the world, and is one of the countries with the most scarce water resources per capita in the world; however, with the increase of human industrial and agricultural production activities, lakes, reservoirs and bays are closed or closed. The massive enrichment of nutrient element...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28C02F101/16
CPCB01J20/06B01J20/12B01J20/20B01J20/28009C02F1/281C02F1/283C02F2101/16
Inventor 郗丹
Owner 郗丹
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