A kind of adsorption material for adsorbing perfluorinated compounds in water body

A technology of perfluorinated compounds and adsorbent materials, which is applied in the field of adsorbent materials for adsorbing perfluorinated compounds in water bodies, can solve the problems of complex preparation process and high cost, and achieve the effects of simple process, long service life and good adsorption effect

Active Publication Date: 2020-12-08
HEBEI UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned adsorbents have good adsorption effect on perfluorinated compounds, they generally have the problems of high cost and complicated preparation process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) An adsorbent material for adsorbing perfluorinated compounds in water bodies. The preparation steps of this material are as follows:

[0024] 1) Raw material ratio: 55% of iron tailings, 25% of corn stalk powder, 5% of fly ash, 15% of ordinary Portland cement; the mass composition of the iron tailings is SiO 2 :48~53%, CaCO 3 :13~18%, Fe 2 o 3 :8~13%, Al 2 o 3 : 6-8%, other 5-13%. 2) Mixing: Add iron tailings into the mixer and stir at 90r / min for 2min, add corn stalk powder and stir at 40r / min for 2min, add fly ash and ordinary portland cement and stir at 40r / min for 2min, then stir at 90r / min / min stirring for 3min. After dry mixing, stir at 40r / min for 2min, add deionized water with a mass ratio of 1:5, and continue stirring at 90r / min for 3min.

[0025] 3) Granulation: put the mixed material into a spherical mold with a diameter of 1 cm.

[0026] 4) Curing: Curing at a constant temperature for 7 days under a closed condition of 25°C to obtain cured pell...

Embodiment 2

[0032] (1) A method of an adsorbent material for adsorbing perfluorinated compounds in a water body. The specific steps are as follows:

[0033] 1) Raw material ratio: iron tailings 55%, corn straw powder 5%, fly ash 15%, Portland cement 25%.

[0034] 2) Mixing: Add iron tailings to the mixer and stir at 90r / min for 2min, add corn stalk powder and stir at 40r / min for 2min, add fly ash and portland cement and stir at 40r / min for 2min, then stir at 90r / min min stirred for 3 min. After dry mixing, stir at 40r / min for 2min, add deionized water with a mass ratio of 1:5, and continue stirring at 90r / min for 3min.

[0035] 3) Granulation: put the mixed material into a spherical mold with a diameter of 1 cm.

[0036] 4) Curing: Curing at a constant temperature for 7 days under a closed condition of 25°C to obtain cured pellets.

[0037] 5) Anoxic roasting: place the cured pellets in a tube furnace, and feed nitrogen, control the volume content of oxygen to 5%, and the gas flow rat...

Embodiment 3

[0042] (1) A method of an adsorbent material for adsorbing perfluorinated compounds in a water body. The specific steps are as follows:

[0043] 1) Raw material ratio: 75% of iron tailings, 5% of corn straw powder, 5% of fly ash, and 15% of Portland cement.

[0044] 2) Mixing: Add iron tailings to the mixer and stir at 90r / min for 2min, add corn stalk powder and stir at 40r / min for 2min, add fly ash and portland cement and stir at 40r / min for 2min, then stir at 90r / min min stirred for 3 min. After dry mixing, stir at 40r / min for 2min, add deionized water with a mass ratio of 1:5, and continue stirring at 90r / min for 3min.

[0045] 3) Granulation: put the mixed material into a spherical mold with a diameter of 1 cm.

[0046] 4) Curing: Curing at a constant temperature for 7 days under a closed condition of 25°C to obtain cured pellets.

[0047] 5) Anoxic roasting: place the cured pellets in a tube furnace, and feed nitrogen, control the volume content of oxygen to 5%, and t...

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Abstract

The invention discloses an adsorbing material for adsorbing perfluorinated compounds in a water body. The adsorbing material is prepared by taking iron tailings as a main raw material, taking straw powder and fly ash as doping agents, adding cement, mixing, granulating, maintaining and performing anoxic roasting. The raw materials comprise the following components in percentage by mass: 50-75% ofiron tailings, 5-35% of straw powder, 5-15% of fly ash and 10-25% of cement. The iron tailings comprise, by mass, 48%-53% of SiO2, 13%-18% of CaCO3, 8%-13% of Fe2O3, 6%-8% of Al2O3 and 5%-13% of othercomponents. The adsorbing material is low in cost, simple and convenient in process and high in removal efficiency.

Description

Technical field: [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to an adsorption material for adsorbing perfluorinated compounds in water bodies. Background technique: [0002] Perfluorinated compounds are emerging persistent organic pollutants in which all hydrogen atoms linked to carbon in organic compound molecules are replaced by fluorine atoms. Perfluorinated compounds present in the environment mainly include perfluorocarboxylic acids and perfluorosulfonic acids. Although the C-F chains in perfluorinated compounds are hydrophobic, they have hydrophilic functional groups, so they have higher solubility. The C-F bond energy in perfluorinated compounds is very large, so that perfluorinated compounds have high stability and are not easy to be degraded. These characteristics make perfluorinated compounds persistent and bioaccumulative in the water environment, posing a potential hazard to the safety of the water envi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/36
CPCB01J20/16B01J20/20C02F1/281C02F1/283C02F2101/36
Inventor 马小东陈延豪王淑荣
Owner HEBEI UNIV OF TECH
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