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Preparation method of fly ash magnetic bead-activated carbon composite adsorbent

A composite adsorption, activated carbon technology, applied in chemical instruments and methods, alkali metal compounds, restoration of polluted soils, etc., can solve problems such as unsatisfactory stirring effect, uneven particle distribution, and agglomeration of raw materials.

Active Publication Date: 2021-05-11
绍兴越信环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the process of preparing a composite soil remediation agent, a stirring device is usually required, but the stirring effect of the existing stirring device is not very satisfactory, and there will still be agglomeration of raw materials and uneven distribution of particles in the obtained product, which will affect the soil remediation agent. effect

Method used

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  • Preparation method of fly ash magnetic bead-activated carbon composite adsorbent
  • Preparation method of fly ash magnetic bead-activated carbon composite adsorbent
  • Preparation method of fly ash magnetic bead-activated carbon composite adsorbent

Examples

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Effect test

Embodiment 1

[0028] A preparation method of fly ash magnetic beads-activated carbon composite adsorbent, comprising the following steps:

[0029] (a) using a magnetic separator to screen out magnetic beads with a magnetic induction intensity of 100 to 300 mt from the fly ash, and then place the magnetic beads in a sodium hydroxide solution with a pH value of 9 for 4 hours to obtain pretreated magnetic beads;

[0030] (b) Wash the pretreated magnetic beads with deionized water until the pH value of the leach solution is neutral, then transfer the resulting mixed system to a stirring device and add deionized water to adjust the mass-solid-liquid ratio of the magnetic bead mixture to 1:9 , then adding a concentration of 0.5wt% chitosan aqueous solution, silane coupling agent and Span-80, stirred at 70 ° C for 24h, obtained modified magnetic beads after separation, wherein the pretreatment magnetic beads and chitosan aqueous solution, The dosage ratio of silane coupling agent and Span-80 is 10...

Embodiment 2

[0040] A preparation method of fly ash magnetic beads-activated carbon composite adsorbent, comprising the following steps:

[0041] (a) Using a magnetic separator to screen out magnetic beads with a magnetic induction intensity of 100 to 300 mt from the fly ash, and then place the magnetic beads in a sodium hydroxide solution with a pH value of 11 for 2 hours to obtain pretreated magnetic beads;

[0042] (b) Wash the pretreated magnetic beads with deionized water until the pH value of the leach solution is neutral, then transfer the resulting mixed system to a stirring device and add deionized water to adjust the mass-solid-liquid ratio of the magnetic bead mixture to 1:9 , then adding a concentration of 0.5wt% chitosan aqueous solution, silane coupling agent and Span-80, stirred at 80 ° C for 24h, obtained modified magnetic beads after separation, wherein the pretreatment magnetic beads and chitosan aqueous solution, The dosage ratio of silane coupling agent and Span-80 is 1...

Embodiment 3

[0045] A preparation method of fly ash magnetic beads-activated carbon composite adsorbent, comprising the following steps:

[0046] (a) using a magnetic separator to screen out magnetic beads with a magnetic induction intensity of 100 to 300 mt from the fly ash, and then place the magnetic beads in a sodium hydroxide solution with a pH value of 9 and immerse them for 5 hours to obtain pretreated magnetic beads;

[0047] (b) Wash the pretreated magnetic beads with deionized water until the pH value of the leach solution is neutral, then transfer the resulting mixed system to a stirring device and add deionized water to adjust the mass-solid-liquid ratio of the magnetic bead mixture to 1:11 , then adding a concentration of 0.5wt% chitosan aqueous solution, silane coupling agent and Span-80, stirred at 90 ° C for 20h, obtained modified magnetic beads after separation, wherein the pretreatment magnetic beads and chitosan aqueous solution, The dosage ratio of silane coupling agent...

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Abstract

The invention discloses a preparation method of a fly ash magnetic bead-activated carbon composite adsorbent, which comprises the following steps: (a) screening out magnetic beads from fly ash, and soaking the magnetic beads in an alkaline solution to obtain pretreated magnetic beads; (b) washing the pretreated magnetic beads with deionized water, then transferring the obtained mixed system into a stirring device, adjusting the mass solid-liquid ratio of the magnetic bead mixed solution to 1: (9-11), then adding a chitosan aqueous solution, a silane coupling agent and Span-80, stirring and separating to obtain modified magnetic beads; and (c) putting the modified magnetic beads and activated carbon into a mixer, adding deionized water and a macromolecular cross-linking agent, stirring and mixing, and then filtering and drying to obtain the magnetic bead-activated carbon composite adsorbent. The prepared product can effectively adsorb soil pollutants, the adsorption efficiency is high, the adsorption capacity is high, and the risk that soil is polluted again when a traditional soil remediation agent is adopted is avoided.

Description

technical field [0001] The invention relates to the technical field of soil remediation agents, in particular to a preparation method of a fly ash magnetic bead-activated carbon composite adsorbent. Background technique [0002] Existing soil remediation agents include heavy metal curing agents and organic matter degradation agents. After the heavy metal curing agents are solidified during the in-situ repair process, they will still exist in the soil in another form and cannot be completely separated. When the environment changes or remains After the agent is stimulated by environmental conditions, there is still a risk of heavy metal leakage; and after the soil is repaired with an organic matter degradation agent, some degraded substances will remain in the soil, and there is also a risk of soil re-contamination. Therefore, it is necessary to develop a composite soil remediation agent to solve the above problems. [0003] In the process of preparing a composite soil remedi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30B09C1/00
CPCB01J20/20B01J20/28009B01J20/24C09K17/02
Inventor 赵博徐明黄关火范叶超顾一飞
Owner 绍兴越信环保科技有限公司