Simple method for loading ultrafine nano zero-valent iron on porous material

A porous material and ultra-fine nano technology, applied in chemical instruments and methods, other chemical processes, physical/chemical process catalysts, etc., can solve problems such as increasing operational complexity, and achieve easy operation, small particle size, and increased surface area Effect

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

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Problems solved by technology

In order to prevent the hydrolysis of iron ions, an organic dispersant (such as polyethylene glycol) should als

Method used

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  • Simple method for loading ultrafine nano zero-valent iron on porous material
  • Simple method for loading ultrafine nano zero-valent iron on porous material
  • Simple method for loading ultrafine nano zero-valent iron on porous material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1 : The preparation method of the porous material loaded with ultrafine nanometer zero-valent iron of the present invention

[0043] The synthesizing schematic diagram of the porous material loaded with ultrafine nanometer zero valent iron provided by the present invention is as follows figure 1 Shown, its specific preparation method is:

[0044] First, weigh a certain proportion of organic iron salt and organic ligands and mix them with porous materials: for powdery porous materials, they can be directly mixed with organic iron salts and ligands in a mortar; for bulk porous materials, organic The solid powder of iron salts and ligands sticks to the surface of the block material, and can also be sprinkled in the middle of the material. The obtained mixed solid is put into a crucible, and heated at a high temperature of 700-1100° C. for 1-4 hours under the protection of an inert gas to obtain a porous material adsorbent / catalyst loaded with ultrafine particle ...

Embodiment 2

[0045] Example 2 : Structural characterization of the porous material loaded with ultrafine nanometer zero-valent iron of the present invention

[0046] This embodiment is the structural characterization of the porous material loaded with ultrafine nano-zero valent iron, as follows:

[0047] 1.TEM

[0048] High-resolution transmission electron microscope JEM-2100F, JEOL (Hitachi, Japan) was used to analyze the particle size and morphology of porous materials loaded with ultrafine nano-zero valent iron.

[0049] figure 2 A is a composite material of ultrafine zero-valent iron / graphitized carbon that can be obtained by heating at high temperature under the protection of organic iron salt and ligand inert gas; figure 2 B is a composite material loaded with ultrafine zero-valent iron prepared by "fumigation method" with activated carbon as the carrier. It can be seen from these figures that the zero-valent iron prepared by the "fumigation method" has a diameter of about 2-6...

Embodiment 3

[0059] Example 3 : Adsorption / catalysis performance test of porous material loaded with ultrafine nanometer zero-valent iron of the present invention

[0060] In this example, methyl orange was selected as a representative, and the adsorption / catalysis performance of the porous material loaded with ultrafine nanometer zero-valent iron was tested.

[0061] The operation steps of the test are as follows: Prepare 80mL of 50mg / L methyl orange standard substance, adjust the pH of the solution to 4.0, put it in a 100mL polyethylene plastic vial, add 8g of coke loaded with ultrafine nano-zero valent iron, and place it in a shaker. Shake, take 1.0mL samples at regular intervals, take the supernatant after centrifugation, and measure the concentration of methyl orange with a UV-Vis spectrophotometer. For the activated carbon powder material loaded with ultra-fine zero-valent iron, configure 200mg / L methyl orange standard 50mL, add 25mg activated carbon powder material loaded with zer...

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Abstract

The invention belongs to the technical field of high-toxicity pollutant treatment, and relates to a simple and convenient method for loading superfine nano zero-valent iron on a porous material and application of the porous material as an adsorbent and a heterogeneous Fenton catalyst for degrading and removing pollutants. The organic iron salt, the organic ligand and the porous material only needto be simply mixed and then are subjected to high-temperature carbonization under the protection of inert gas, so that the superfine zero-valent iron can be uniformly loaded on the inner and outer surfaces and pore passages of the porous material. According to the method, a complex, time-consuming and harsh liquid-phase impregnation process in a conventional liquid-phase reduction method is omitted, no solvent or dispersing agent is needed, and the utilization rate of raw materials is high. The obtained zero-valent iron is large in loading capacity, good in crystallinity and small in particlesize. The porous material loaded with the superfine nanoscale zero-valent iron can be used as an adsorbent and a catalyst, and high-toxicity inorganic and organic pollutants in a water body are removed by utilizing adsorption, an Fe-C micro-electrolysis technology and a Fenton oxidation technology.

Description

technical field [0001] The invention belongs to the technical field of highly toxic pollutant treatment, and relates to a simple and convenient method for loading ultrafine nanometer zero-valent iron on a porous material and its application as an adsorbent and a heterogeneous Fenton catalyst to degrade and remove pollutants. Background technique [0002] Iron is the most abundant transition metal and the fourth most abundant element on the Earth's surface. Therefore, iron-based materials have received increasing attention in various environmental engineering fields. The strong reducibility of zero-valent iron (E 0 =-0.44V) and good adsorption capacity for important pollutants (such as heavy metals and metal colloids) make it widely used in the research of environmental remediation. The earliest environmental application of nanometer zero-valent iron (nZVI) was the reductive dechlorination of chlorinated solvents. Nano-ZVI materials are more active than traditional iron po...

Claims

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Application Information

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IPC IPC(8): B01J23/745B01J27/22B01J20/20B01J20/12B01J20/30C02F1/28C02F1/461C02F1/72C02F101/30
CPCB01J20/02B01J20/0229B01J20/12B01J20/20B01J23/745B01J27/22B01J2220/4806B01J2220/4812C02F1/281C02F1/283C02F1/461C02F1/722C02F1/725C02F2101/30C02F2101/308
Inventor 蔡亚岐牛红云吕宏洲
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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