Preparation method and application of spherical nano iron-sulfur composite material

A composite material and nano-iron technology, which is applied in the field of preparation of spherical nano-iron-sulfur composite materials, can solve the problems of short service life and low electron utilization efficiency, and achieve the effects of improving service life, increasing electronic utilization efficiency and high efficiency.

Active Publication Date: 2021-03-12
INST OF SOIL SCI CHINESE ACAD OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] For Fe 0 Short lifetime, easy and H 2 O corrodes to produce Fe 2+ and H 2 The problem of low electron utilization efficiency is caused. The present invention provides a preparation method and application of a spherical nano-iron-sulfur composite material. Under mild synthesis conditions, the spherical nano-iron-sulfur composite material is synthesized to activate PS to degrade organic pollution in soil and water. matter, spherical nano-iron-sulfur composites can effectively increase Fe 0 Electron utilization efficiency (reduction of Fe 0 Corrosion produces Fe 2+ and H 2 ), realize the high electron utilization efficiency of nano-iron-sulfur composite materials, efficiently activate PS and improve its service life at the same time, so as to overcome the defects of the prior art

Method used

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  • Preparation method and application of spherical nano iron-sulfur composite material
  • Preparation method and application of spherical nano iron-sulfur composite material
  • Preparation method and application of spherical nano iron-sulfur composite material

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Experimental program
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Effect test

Embodiment 1

[0031] This embodiment provides the preparation method and application of spherical nano-iron-sulfur composite material:

[0032] Dissolve ferrous nitrate in hydrochloric acid solution with a pH value of 4.0 at room temperature, and add Na 2 S solution, reacted for 30 minutes, then added tea polyphenols, continued stirring and reacting for 60 minutes to obtain black particles, magnetically separated, washed, and vacuum freeze-dried to obtain spherical nano-iron-sulfur composite materials. Among them, Na 2 The molar ratio of S to ferrous salt is 1:1, and the molar ratio of tea polyphenols to ferrous salt is 1:1.

[0033] The X-ray diffraction pattern (XRD) of spherical nano-iron-sulfur composites is as follows: figure 1 shown.

[0034] This material was used to activate PS to degrade 1,2-dichlorobenzene (1,2-DCB, C 6 h 4 C l2 ), the specific degradation method is: add persulfate in the soil containing 1,2-dichlorobenzene, add the spherical nano-iron-sulfur composite mater...

Embodiment 2

[0039] This embodiment provides the preparation method and application of spherical nano-iron-sulfur composite material:

[0040] Dissolve ferrous sulfate in a hydrochloric acid solution with a pH value of 4.5 at room temperature, and add Na 2 S solution, reacted for 30 minutes, then added tea polyphenols, continued stirring and reacting for 60 minutes to obtain black particles, magnetically separated, washed, and vacuum freeze-dried to obtain spherical nano-iron-sulfur composite materials. Among them, Na 2 The molar ratio of S to ferrous salt is 2:1, and the molar ratio of tea polyphenols to ferrous salt is 1:2.

[0041] The scanning electron microscope (SEM) images of spherical nano-iron-sulfur composites are as follows: figure 2 shown.

[0042] The material was used to activate PS to degrade trichlorethylene (TCE, C 2 HCl 3 ), the specific degradation method is: add persulfate in the groundwater containing trichlorethylene, add the spherical nano-iron-sulfur composite...

Embodiment 3

[0047] This embodiment provides the preparation method and application of spherical nano-iron-sulfur composite material:

[0048] Dissolve ferrous chloride in a hydrochloric acid solution with a pH value of 4 at room temperature, and add Na 2 S solution, reacted for 30 minutes, then added tea polyphenols, continued stirring and reacting for 60 minutes to obtain black particles, magnetically separated, washed, and vacuum freeze-dried to obtain spherical nano-iron-sulfur composite materials. Among them, Na 2 The molar ratio of S to ferrous salt is 5:1, and the molar ratio of tea polyphenols to ferrous salt is 2:1.

[0049] Energy dispersive spectroscopy (EDS) of spherical nano-iron-sulfur composites image 3 shown.

[0050] This material was used to activate PS to degrade sulfamethoxine sodium (SMM, C 12 h 13 N 4 NaO 4 S), the specific degradation method is: add persulfate in groundwater containing trichlorethylene, add the spherical nanometer iron-sulfur composite materi...

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Abstract

The invention discloses a preparation method and application of a spherical nano iron-sulfur composite material, and the preparation method comprises the following steps: dissolving a ferrite in a hydrochloric acid solution at room temperature, introducing nitrogen, adding a Na2S solution under a stirring condition, carrying out a reaction, then adding tea polyphenol, continuously conducting stirring, and carrying out a reaction to obtain black particles; and carrying out post-treatment to obtain the spherical nano iron-sulfur composite material. The molar ratio of Na2S to the ferrite is 5:1 to 1:1; and the molar ratio of the tea polyphenol to the ferrite is 1:2 to 2:1. The spherical iron-sulfur composite material activated persulfate has the advantages of high electron transport speed, high persulfate activation efficiency, high oxidation capacity of generated active free radicals, high persulfate utilization rate and the like, and has a wide application prospect in the aspect of remediation of organic contaminated soil and water bodies.

Description

technical field [0001] The invention belongs to the field of soil and groundwater pollution restoration, and relates to a material for degrading organic matter, in particular to a preparation method and application of a spherical nano-iron-sulfur composite material. Background technique [0002] Activated persulfate (S 2 o 8 2- , PS) produce strong oxidizing sulfate radicals (SO 4 · - ,E 0 =2.6V) is applied to the remediation of organic pollutants in soil and water, which is a new field recently developed at home and abroad, and is one of the advanced oxidation technologies with the most application potential at present. Based on PS advanced oxidation technology, it has good oxidant stability and the SO produced 4 · - It has the advantages of strong free radical oxidation ability, little influence by pH and non-toxic and harmless final product. The key to the application of PS advanced oxidation technology is how to use appropriate activation methods or activation ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72B09C1/00B09C1/08C02F101/30C02F101/36C02F103/06
CPCC02F1/72B09C1/08B09C1/002C02F2101/30C02F2101/36B09C2101/00C02F2103/06
Inventor 晏井春陈梦舫钱林波韩璐顾明月
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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