S-ZVI magnetic environment restoration material as well as preparation method and application thereof

A technology of S-ZVI and magnetic materials, applied in chemical instruments and methods, other chemical processes, magnetic/electric field water/sewage treatment, etc., can solve problems such as limiting the application range of ZVI, reducing ZVI reaction ability, and weakening electron transfer ability , to achieve the effect of promoting electron transfer, high saturation magnetization and low production cost

Pending Publication Date: 2021-05-04
YANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As a reducing agent, zero-valent iron (ZVI) has been widely used in the removal of various environmental pollutants due to its strong electron contribution ability and high reactivity. However, due to the high surface energy and magnetic properties of ZVI, it is easy to Agglomeration and sedimentation occur, which reduces the reaction ability of ZVI; in addition, ZVI is also prone to passivation reaction with water, so that its activity gradually decreases during the reaction process, and the electron transfer ability is weakened, which limits the application range of ZVI
[0004] Compared with ZVI, ferrous sulfide (FeS) has hydrophobicity, large specific surface area and strong electron transfer ability, and its removal effect on pollutants is relatively long-lasting, but its removal ability is weak, and it is not magnetic, which is not conducive to Recycle

Method used

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  • S-ZVI magnetic environment restoration material as well as preparation method and application thereof
  • S-ZVI magnetic environment restoration material as well as preparation method and application thereof
  • S-ZVI magnetic environment restoration material as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Take 25 mL of 0.1 M FeCl 3 ·6H 2 O in a 250 mL Erlenmeyer flask, continuously pass Ar 2 20 min, to drive away the dissolved oxygen in the solution, under Ar 2 Under the conditions of protection and ultrasound, drop 25 ml 0.3 M NaBH 4After the solution was added dropwise, ultrasonic reaction was continued for 30 min. The obtained product was separated by a magnet, washed with a mixed solution of ethanol and deionized water (volume ratio 2:1), and then vacuum-dried at 60 °C for 12 h to obtain a ZVI solid material. Its scanning electron microscope picture is as figure 1 As shown, ZVI is in a chain structure and clustered together.

example 2

[0048] Take 25 mL of 0.1 M FeCl 3 ·6H 2 O in a 250 mL Erlenmeyer flask, continuously pass Ar 2 20 min, to drive away the dissolved oxygen in the solution, under Ar 2 Under the conditions of protection and ultrasound, drop 25 ml 0.3 M NaBH 4 Solution, continue ultrasonic reaction for 30 min after the dropwise addition; then in Ar 2 Under the conditions of protection and ultrasound, add 2.5 ml 0.1 M Na dropwise to the above solution 2 S 2 o 3 After the solution was added dropwise, ultrasonic reaction was continued for 30 min. The obtained product was separated by a magnet, washed with a mixed solution of ethanol and deionized water (volume ratio 2:1), and dried under vacuum at 60 °C for 12 h to obtain a solid S-ZVI material. Its scanning electron microscope picture is as figure 2 As shown, S-ZVI has a sheet-like structure.

example 3

[0050] The prepared S-ZVI was characterized by elemental energy spectrum analysis, and the characterization results were as follows: image 3 shown. The particles contain Fe, S, and O elements, of which Fe element is the main component, indicating that FeSx is formed inside or on the surface of S-ZVI particles by sulfur doping, which is consistent with the weakening of the XRD zero-valent iron diffraction peak intensity. Thus, it was confirmed that the preparation of S-ZVI was successful. .

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Abstract

The invention discloses an S-ZVI magnetic environment restoration material as well as a preparation method and application thereof. Ferric ions are reduced into zero-valent iron by using a reducing agent (sodium borohydride and potassium borohydride), then a sulfur source (such as sodium thiosulfate) is added to form a layer of ferrous sulfide on the surface of the zero-valent iron, and the S-ZVI material is prepared. After the S-ZVI material is modified by the sulfur source, the S-ZVI material overcomes the problems that zero-valent iron is easy to agglomerate and passivate, and the electron transfer rate and the reaction activity of the zero-valent iron are improved. The environmental remediation material prepared by the preparation method is low in cost, the preparation method is simple and convenient, the negative influence on the environment is small, meanwhile, the material prepared by the method has the advantage in removing heavy metal chromium, and the material is good in stability and convenient to recycle.

Description

technical field [0001] The invention belongs to the technical field of environmental restoration materials, and in particular relates to a S-ZVI magnetic environmental restoration material and its preparation method and application. Background technique [0002] Chromium (Cr) is widely used in industries such as metallurgy, pigments, and tanning, and its common valence states are trivalent chromium (Cr(III)) and hexavalent chromium (Cr(VI)). Due to the high activity and strong oxidizing properties of Cr(VI), it has caused great harm to the environment and human health, so the research on the reduction fixation of Cr(VI) is of great significance. [0003] As a reducing agent, zero-valent iron (ZVI) has been widely used in the removal of various environmental pollutants due to its strong electron contribution ability and high reactivity. However, due to the high surface energy and magnetic properties of ZVI, it is easy to Agglomeration and sedimentation occur, which reduces t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/02B01J20/28B01J20/30C02F1/28C02F1/46C02F1/48C02F1/70C02F101/22
CPCB01J20/0229B01J20/0285B01J20/02B01J20/28009B01J20/28011C02F1/281C02F1/705C02F1/46C02F1/488C02F2101/22
Inventor 王圣森刘丽张妮梁乐缤王小治尹微琴赵海涛
Owner YANGZHOU UNIV
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