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A kind of preparation method of fly ash magnetic beads-activated carbon composite adsorbent

A technology of composite adsorption and activated carbon, which is applied to the restoration of chemical instruments and methods, alkali metal compounds, and contaminated soil, etc., can solve the problems of affecting the efficacy of soil remediation agents, unsatisfactory stirring effect, and uneven particle distribution, etc., to achieve reduction Soil remediation cost, improvement of dispersion and fluidity, heating uniformity, and high adsorption efficiency

Active Publication Date: 2022-06-17
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

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  • A kind of preparation method of fly ash magnetic beads-activated carbon composite adsorbent
  • A kind of preparation method of fly ash magnetic beads-activated carbon composite adsorbent
  • A kind of preparation method of fly ash magnetic beads-activated carbon composite adsorbent

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Embodiment 1

[0028] A preparation method of fly ash magnetic bead-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 100-300 mt from the fly ash, and then immersing the magnetic beads in a sodium hydroxide solution with a pH of 9 for 4 hours to obtain pretreated magnetic beads;

[0030] (b) Use deionized water to wash the pretreated magnetic beads until the pH value of the leaching solution is neutral, then transfer the obtained mixed system to a stirring device and add deionized water to adjust the mass-solid-to-liquid ratio of the magnetic bead mixed solution to 1:9 , and then add 0.5 wt% chitosan aqueous solution, silane coupling agent and Span-80, stir at 70 °C for 24 h, and obtain modified magnetic beads after separation, in which the pretreated magnetic beads and chitosan aqueous solution, The dosage ratio of silane coupling agent and Span-80 is 10g:100mL:0.1...

Embodiment 2

[0040] A preparation method of fly ash magnetic bead-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 100-300 mt from the fly ash, and then immersing the magnetic beads in a sodium hydroxide solution with a pH value of 11 for 2 hours to obtain pretreated magnetic beads;

[0042] (b) Use deionized water to wash the pretreated magnetic beads until the pH value of the leaching solution is neutral, then transfer the obtained mixed system to a stirring device and add deionized water to adjust the mass-solid-to-liquid ratio of the magnetic bead mixed solution to 1:9 , and then add 0.5wt% chitosan aqueous solution, silane coupling agent and Span-80, stir at 80 °C for 24 h, and obtain modified magnetic beads after separation, wherein the pretreated magnetic beads and chitosan aqueous solution, The dosage ratio of silane coupling agent and Span-80 is 10g:300m...

Embodiment 3

[0045] A preparation method of fly ash magnetic bead-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 100-300 mt from the fly ash, and then immersing the magnetic beads in a sodium hydroxide solution with a pH of 9 for 5 hours to obtain pretreated magnetic beads;

[0047] (b) Wash the pretreated magnetic beads with deionized water until the pH of the leaching solution is neutral, then transfer the obtained mixed system to a stirring device and add deionized water to adjust the mass-solid-to-liquid ratio of the magnetic bead mixed solution to 1:11 , and then add 0.5wt% chitosan aqueous solution, silane coupling agent and Span-80, stir at 90 ℃ for 20 h, and obtain modified magnetic beads after separation, in which the pretreated magnetic beads and chitosan aqueous solution, The dosage ratio of silane coupling agent and Span-80 is 10g:200mL:0.1g:3mL;

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Abstract

The invention discloses a preparation method of a fly ash magnetic bead-activated carbon composite adsorbent, comprising the following steps: (a) screening the magnetic beads from the fly ash, immersing the magnetic beads in an alkaline solution to obtain a pre- Handle the magnetic beads; (b) wash the pretreated magnetic beads with deionized water, then transfer the resulting mixed system to a stirring device and adjust the mass-solid-liquid ratio of the magnetic bead mixture to 1:9-11, then add chitosan aqueous solution, silane coupling agent and Span‑80, stir and separate to obtain modified magnetic beads; (c) place modified magnetic beads and activated carbon in a mixer, add deionized water and polymer crosslinking agent, and stir Mixed, then filtered and dried to obtain a magnetic bead-activated carbon composite adsorbent. The product prepared by the invention can effectively adsorb soil pollutants, has high adsorption efficiency and strong adsorption capacity, and avoids the risk of soil re-pollution existing in traditional soil restoration agents.

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 solidifying agents and organic degrading agents, among which heavy metal solidifying agents will still exist in the soil in another form after solidification in the in-situ remediation process and cannot be completely separated. After the chemical is stimulated by environmental conditions, there is still the risk of heavy metal leakage; while the use of organic matter-degrading chemical to remediate the soil will produce some degraded substances remaining in the soil, and there is also the risk of soil recontamination. Therefore, it is necessary to develop a composite soil remediation agent to solve the above problems. [0003] In the process of preparing the composite soil remediation agent, a st...

Claims

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Application Information

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Patent Type & Authority Patents(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