Nano zero-valent iron composite material with superstrong reducibility and photocatalytic performance

A technology of nano-zero-valent iron and composite materials, which is applied in special compound water treatment, reduced water/sewage treatment, physical/chemical process catalysts, etc. It can solve problems such as difficult preparation of composite materials, environmental pollution, and operator hazards. Achieve the effect of simple preparation method, simple method and simplified preparation

Active Publication Date: 2020-05-05
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the conventional CVD method, the S powder or thiourea as the S source is far in excess, or it is necessary to continuously feed H during the reaction process. 2 S gas, causing pollution to the environment and potential hazards to operators
Moreover, it is difficult to prepare composites of iron sulfide and NZVI with a core-shell structure

Method used

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  • Nano zero-valent iron composite material with superstrong reducibility and photocatalytic performance
  • Nano zero-valent iron composite material with superstrong reducibility and photocatalytic performance
  • Nano zero-valent iron composite material with superstrong reducibility and photocatalytic performance

Examples

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Comparison scheme
Effect test

Embodiment 1

[0049] Example 1 Summary of the invention: the preparation method of the nano zero-valent iron composite material with super-reducibility and photocatalytic performance of the present invention.

[0050] The synthesizing schematic diagram of the nano zero-valent iron composite material with super-reducibility and photocatalytic properties provided by the present invention is as follows figure 1 Shown, its specific preparation method is:

[0051] First, weigh a certain proportion of iron powder and sulfur powder, and mix them evenly; then, the obtained mixed solid is added into a quartz tube according to a certain mass / volume ratio, and the quartz tube is placed on a tube sealing machine, and after vacuuming, use hydrogen oxygen The gas generated by the machine is burned to seal the tube and heated in a muffle furnace for a period of time; the obtained product is washed with an organic solvent to remove excess S powder, and a nano-zero-valent iron composite material with supe...

Embodiment 2

[0052] Example 2: Structural characterization of nano-zero-valent iron composites with super-reducibility and photocatalytic properties of the present invention

[0053] This example is a structural characterization of nano-zero-valent iron composite materials with super reducing and photocatalytic properties, as follows:

[0054] 1. XRD spectrum

[0055] The X-ray diffraction (XRD) pattern of the nano-zero-valent iron composite with super reducing and photocatalytic properties was obtained on a b / max-RB Diffractometer (Rigaku, Japan), using nickel to filter Cu Kα rays, and the scanning range was from 10 ° to 80°, the scanning speed is 4° / min.

[0056] Such as figure 2 As shown, the FeS 1-x / Fe 3 o 4 On the XRD spectrum of the @Fe composite material, the diffraction peaks at 29.6°, 33.4°, 43.1° and 51.6° represent the monoclinic Fe in the shell 7 S 8 (JCPDS No.29-0723); the diffraction peaks with diffraction angles of 35.4°, 43.5°, 56.8° and 62.4° represent Fe with i...

Embodiment 3

[0075] Example 3 : The present invention has the reduction / photocatalytic performance test of nanometer zero-valent iron composite material with super-reducibility and photocatalytic performance

[0076] In this embodiment, Cr(VI) and Pb(II) are selected as representatives of highly toxic inorganic pollutants, and nitrophenol, methyl orange and methylene blue are representatives of refractory organic pollutants. The reduction / photocatalytic energy of the Fe composites was tested.

[0077] The operation steps of the test are as follows: prepare 50 mL of each pollutant standard solution, wherein the concentrations of Cr(VI) and Pb(II) are respectively 1 mM, the concentration of methyl orange is 50 mg / L, and the concentration of each nitrobenzene and methylene blue is 20 mg / L , placed in a 100mL polyethylene plastic vial, add 25mg FeS 1-x / Fe 3 o 4 @Fe composite material, so that the reducing agent / catalyst concentration is 0.5g / L. Shake the reaction solution in a shaker; i...

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Abstract

The invention belongs to the technical field of high-toxicity pollutant treatment, and relates to a preparation method of a nano zero-valent iron composite material with superstrong reducibility and photocatalytic performance and application of the nano zero-valent iron composite material as a reducing agent and a photocatalyst to removal of organic and inorganic high-toxicity pollutants in a water body. The material is composed of a zero-valent iron core and a single crystal FeS1-x / Fe3O4 mixed shell. The preparation method is simple and green, and the utilization rate of raw materials is high. The core zero-valent iron is prevented from being eroded by water molecules and dissolved oxygen in water due to a good core-shell structure; a proper hydrophobic FeS1-x / Fe3O4 shell can be used forefficiently adsorbing and enriching pollutants in water; the good conductivity of the Fe3O4 shell ensures that electrons of the core zero-valent iron can be quickly transferred to pollutants adsorbedon the surface of the material. The material has the unique photocatalytic performance, and can accelerate reduction, oxidation and thorough mineralization of pollutants under irradiation of visible light or sunlight.

Description

technical field [0001] The invention belongs to the technical field of highly toxic pollutant treatment, and relates to a preparation method of a nano-zero-valent iron composite material with super-reducibility and photocatalytic performance and its application as a reducing agent and photocatalyst to remove organic and inorganic highly toxic pollutants in water bodies . Background technique [0002] Nano zero-valent iron (NZVI) refers to zero-valent iron particles with particle diameters in the range of 1 to 100 nm. Compared with macroscopic zero-valent iron materials, it has special properties, such as surface effect, volume effect and macroscopic quantum tunneling effect. Compared with zero-valent iron particles, nano-sized zero-valent iron particles, due to the reduction of particle diameter, the percentage of surface atoms in total atoms increases significantly, from 1% to 2% at the micron scale to more than 50%. With the increase of the surface area of ​​nano-metal p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/043C02F1/30C02F1/70C02F1/72C02F101/20C02F101/22C02F101/30C02F101/34
CPCB01J27/043B01J35/004C02F1/30C02F1/70C02F1/725C02F2101/20C02F2101/22C02F2101/308C02F2101/345C02F2305/10
Inventor 蔡亚岐牛红云杨永亮
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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