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Iron-based adsorbent and preparation method thereof

An adsorbent, iron-based technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problem of reducing the number of active sites on the surface of the adsorption material, reducing the adsorption of heavy metal cations, unfavorable solid-liquid separation, etc. problems, achieve the effects of reducing loss, reducing oxidation rate, and enhancing stability

Active Publication Date: 2021-03-19
合肥净龙环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in an acidic environment, the iron-based adsorbent itself will dissolve in large quantities, and the surface of the adsorbent is electropositive, thereby reducing the adsorption of heavy metal cations, so it can only be used in neutral or alkaline environments; in addition, the iron-based adsorbent There is also the phenomenon of flocculation and agglomeration, which not only reduces the number of active sites on the surface of the adsorption material, but also is not conducive to the later solid-liquid separation

Method used

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  • Iron-based adsorbent and preparation method thereof
  • Iron-based adsorbent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] The effect of different molar ratios of Fe(II) and Fe(III) on the removal of various heavy metal ions in water:

[0029] Preparation of mixed iron-based solution: according to the molar ratio of ferrous iron Fe(II) to ferric iron Fe(III) is 2:1, 2.5:1, 3:1, respectively weigh the corresponding mass of ferrous sulfate and ferric sulfate, Mix it into distilled water at the same time, stir until completely dissolved in a sealed state, prepare three mixed iron-based solutions with a concentration of 0.5moL / L respectively, and regard the volume of the mixed iron-based solution as 5 unit volumes.

[0030] Basic lye preparation: according to OH - The molar ratio of Fe(II)+Fe(III) is 2:1, weigh sodium hydroxide, mix it into distilled water, stir until completely dissolved in a sealed state, and prepare a base with a concentration of 2.0moL / L and a volume of 2.5 unit volumes lye.

[0031] Sodium hexametaphosphate solution preparation: according to [P 6 o 18 ] 6- Weigh sodiu...

Embodiment 2

[0040] Different OH - The effect of the molar ratio of Fe(II)+Fe(III) on the removal of various heavy metal ions in water:

[0041] Preparation process is with embodiment 1, and embodiment 1 difference is:

[0042] Preparation of mixed iron-based solution: The molar ratio of Fe(II) to Fe(III) was 2.5:1, and three mixed iron-based solutions with a concentration of 0.75moL / L and a volume of 5 unit volumes were prepared.

[0043] Basic lye preparation: OH - The molar ratio of Fe(II)+Fe(III) is 2:1, 3:1, 4:1, and the three concentrations are 2.5moL / L, 3.75moL / L and 5moL / L respectively, and the volume is 3 units volume of base lye.

[0044] Sodium hexametaphosphate solution preparation: [P 6 o 18 ] 6- The molar ratio of Fe(II)+Fe(III) is 4:6, and a sodium hexametaphosphate solution with a concentration of 1.25moL / L and a volume of 2 unit volumes is prepared.

[0045] Preparation of carbon-supported sodium hexametaphosphate solution: The solid / liquid ratio of activated carbon...

Embodiment 3

[0052] Different [P 6 o 18 ] 6- The effect of the molar ratio of Fe(II)+Fe(III) on the removal of various heavy metal ions in water:

[0053] Preparation process is with embodiment 1, and embodiment 1 difference is:

[0054] Preparation of mixed iron-based solution: The molar ratio of Fe(II) to Fe(III) was 2.5:1, and three mixed iron-based solutions with a concentration of 1moL / L and a volume of 5 unit volumes were prepared.

[0055] Basic lye preparation: OH - The molar ratio to Fe(II)+Fe(III) is 3:1, and the basic lye with a concentration of 4.29moL / L and a volume of 3.5 unit volumes is prepared.

[0056] Sodium hexametaphosphate solution preparation: [P 6 o 18 ] 6- The molar ratio to Fe(II)+Fe(III) is 3:6, 4:6, 5:6, and the prepared concentration is 1.67moL / L, 2.22moL / L, 2.78moL / L, and the volume is 1.5 unit volume of three parts sodium hexametaphosphate solution.

[0057] Preparation of carbon-supported sodium hexametaphosphate solution: The solid / liquid ratio of ...

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Abstract

The invention discloses an iron-based adsorbent and a preparation method thereof. The preparation method comprises the following steps: (1) dissolving ferrous sulfate and ferric sulfate into water, and sealing and stirring so as to obtain a mixed iron-based solution; (2) dissolving sodium hydroxide into water, and sealing and stirring so as to obtain a basic alkali liquid; (3) dissolving sodium hexametaphosphate into water, and sealing and stirring so as to obtain a sodium hexametaphosphate solution; (4) mixing activated carbon with the sodium hexametaphosphate solution, and sealing and stirring so as to obtain a carbon-carried sodium hexametaphosphate solution; (5) synchronously mixing the basic alkali liquid and the sodium hexametaphosphate solution, or the basic alkali liquid and the carbon-carried sodium hexametaphosphate solution, with the mixed iron-based solution, sealing so as to obtain slurry, carrying out vacuum drying, and grinding, thereby obtaining the iron-based adsorbent. The iron-based adsorbent has good acid resistance, adsorption properties and stability, and is capable of removing Zn(II), Cu(II), Pb(II), Cd(II), Cr(VI), As(V), Hg(II) and Se(IV) in a water body ofwhich the pH value is 2-13.

Description

technical field [0001] The invention relates to the purification of heavy metal ions in industrial waste water, in particular to an iron-based adsorbent and a preparation method thereof. Background technique [0002] With the rapid expansion of industrial scale, the discharge of wastewater containing various heavy metal pollutants is increasing, which not only causes irreversible damage to the ecological environment, but also brings serious harm to human health. As an adsorbent, iron-based adsorbent materials are widely used in wastewater treatment because of their simple preparation process, high adsorption efficiency, and ability to remove various heavy metal ions. The mixed valence ferrite used as an iron-based adsorption material is composed of hydroxide ions, mixed valence iron ions, and other anions. When using mixed valence ferrite to treat wastewater containing heavy metal ions, the The physical and chemical characteristics of pollutants and waste liquid can flexibl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/20
CPCB01J20/0229B01J20/048B01J20/20C02F1/283C02F2101/20
Inventor 黄涛宋东平刘龙飞张树文周璐璐
Owner 合肥净龙环保科技有限公司
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