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Preparation method and application of nitrogen-doped zero-valent iron composite material

A composite material, zero-valent iron technology, applied in the field of environmental chemistry, can solve the problem of toxic by-products such as dichloroethylene, and achieve the effects of overcoming the passivation problem, high removal efficiency, and easy operation

Active Publication Date: 2020-10-30
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But although the zero-valent iron sulfide prepared by this method has higher activity to trichlorethylene, it produces more toxic by-products (ethylene dichloride).

Method used

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  • Preparation method and application of nitrogen-doped zero-valent iron composite material
  • Preparation method and application of nitrogen-doped zero-valent iron composite material
  • Preparation method and application of nitrogen-doped zero-valent iron composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0039] The nitrogen-doped zero-valent iron material is prepared by a planetary ball mill, and the specific steps are as follows: zirconia ball milling beads (6mm in particle size) with 20% of the cavity volume are loaded into the ball mill tank; 0.046g of melamine powder and 2.454g of reduced iron powder are weighed (Nitrogen-iron mass ratio is 1:53.35) placed in the ball mill tank, and filled with argon in the tank; the ball mill speed was adjusted to 400rpm, and ground for 20 hours; under nitrogen atmosphere, the ground product and the grinding medium were separated by a screen separation to obtain a nitrogen-doped zero-valent iron composite material.

[0040] figure 1 , 2 They are the SEM-EDS diagram and the XPS diagram of the nitrogen-doped zero-valent iron composite material prepared in this example, respectively. From figure 1 It can be seen that its structure is a flaky structure, and it can be clearly seen that there is nitrogen in the material, indicating that mela...

Embodiment 2

[0045] The nitrogen-doped zero-valent iron material is prepared by a planetary ball mill, and the specific steps are as follows: zirconia ball milling beads (6 mm in particle size) of 20% cavity volume are loaded into the ball mill jar; 0.090 g of melamine powder and 2.410 g of reduced iron powder are weighed (mass ratio of nitrogen to iron is 1:26.78) placed in a ball mill tank, and filled with argon in the tank; the ball mill speed was adjusted to 400rpm, and ground for 20 hours; separation to obtain a nitrogen-doped zero-valent iron composite material.

[0046] Taking trichlorethylene as the target pollutant, the activity of the above materials was investigated. Add 0.26 g of nitrogen-doped zero-valent iron composite to a 52 mL serum bottle, add 26 mL of deoxygenated pH buffer solution (50 mM HEPES, pH=7.0), cap tightly with an aluminum cap with a PTFE septum, then add trichlorethylene stock solution to ensure that the initial concentration of trichlorethylene is 10ppm, an...

Embodiment 3

[0050] The nitrogen-doped zero-valent iron material was prepared by a planetary ball mill, and the specific steps were as follows: zirconia ball milling beads (6mm in particle size) with 20% cavity volume were loaded into the ball mill tank; 0.242g of urea powder and 2.258g of reduced iron powder were weighed (Nitrogen-iron mass ratio is 1:9.33) placed in the ball mill tank, and filled with argon in the tank; the ball mill speed was adjusted to 400rpm, and ground for 20 hours; under nitrogen atmosphere, the ground product and the grinding medium were separated by a sieve separation to obtain a nitrogen-doped zero-valent iron composite material.

[0051] Taking trichlorethylene as the target pollutant, the activity of the above materials was investigated. Add 0.26 g of nitrogen-doped zero-valent iron composite to a 52 mL serum bottle, add 26 mL of deoxygenated pH buffer solution (50 mM HEPES, pH=7.0), cap tightly with an aluminum cap with a PTFE septum, then add trichlorethylen...

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Abstract

The invention discloses a preparation method and application of a nitrogen-doped zero-valent iron composite material, and the method comprises the following steps: mixing nitrogen-containing compoundpowder and iron powder according to a mass ratio of 1: (9-125) in an inert gas atmosphere, then carrying out ball milling, and obtaining the nitrogen-doped zero-valent iron composite material after the ball milling is finished, wherein the nitrogen-containing compound is melamine, urea, iron nitride or dicyandiamide. The nitrogen-containing compound powder and the iron powder are subjected to ballmilling, pyridine nitrogen, pyrrole nitrogen and graphite nitrogen can be generated on the surface of the obtained composite material and coordinated with iron to form iron nitride, the passivation problem of a zero-valent iron material in the repairing process can be solved, and the removal efficiency of chlorine-containing organic pollutants and heavy metal pollutants is high.

Description

technical field [0001] The invention relates to the technical field of environmental chemistry, in particular to a preparation method and application of a nitrogen-doped zero-valent iron composite material. Background technique [0002] As a promising material for groundwater remediation, zero-valent iron has received extensive attention and in-depth research at home and abroad. Due to its abundant sources, low price, and strong reducibility, it has been widely used to degrade and remove organic and inorganic pollutants in the environment. [0003] However, there are many defects in the actual engineering application process of zero-valent iron. For example, the strong magnetism and high surface energy of nano-zero-valent iron will make it aggregate into large particles, which will prevent some active sites from being released effectively. The utilization rate is low; at the same time, the dense oxide film on the surface of zero-valent iron will greatly hinder the contact o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/00B22F1/00B22F9/04C02F101/10C02F101/30C02F101/20C02F101/12C02F101/22C02F101/36
CPCB22F1/0003C02F1/00B22F9/04B22F2009/043C02F2101/10C02F2101/30C02F2101/20C02F2101/12C02F2101/22C02F2101/36
Inventor 巩莉邱晓江何锋
Owner ZHEJIANG UNIV OF TECH
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