Air-stable nano zero-valent iron as well as preparation method and application thereof

A nano-zero-valent iron, stable technology, applied in the direction of nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of expensive coating materials, toxic substance pollution, complicated preparation methods, etc., and achieve the reduction of preparation costs and the method simple effect

Inactive Publication Date: 2018-11-06
XIAMEN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned coating modification method has disadvantages such as complica...

Method used

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  • Air-stable nano zero-valent iron as well as preparation method and application thereof
  • Air-stable nano zero-valent iron as well as preparation method and application thereof
  • Air-stable nano zero-valent iron as well as preparation method and application thereof

Examples

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preparation example Construction

[0037] A preparation method of air-stable nanometer zero-valent iron, comprising the following steps:

[0038] (1) Precursor preparation: crushing and screening goethite, limonite or hematite;

[0039] (2) Preparation of nanometer zero-valent iron: the above-mentioned goethite, limonite or hematite powder is packed into a quartz tube, placed in a reduction furnace, and hydrogen is introduced into the reduction furnace as a reducing agent until the gas is released. Condensed water no longer appears, and nanometer zero-valent iron is obtained after cooling under protective gas;

[0040] (3) Passing air into the quartz tube to slowly oxidize the above-mentioned nanometer zero-valent iron, and then obtain "shell-core" nanometer zero-valent iron stable in air.

[0041] Further, in step (2), the dosage of goethite powder is 10 g, and the temperature of the reduction furnace is 550-600° C. Lower temperature will result in incomplete reduction of iron oxide, and higher temperature w...

Embodiment 1

[0045] A preparation method of air-stable nanometer zero-valent iron comprises the following steps:

[0046] (1) Precursor preparation:

[0047] The goethite is crushed and sieved to obtain particles with a particle size of 0.1-0.2 mm.

[0048] (2) Preparation of nanometer zero-valent iron

[0049] Put 10g of the above-mentioned goethite powder into a quartz tube, place it in a reduction furnace at a temperature of 600°C, and feed 100mL / min hydrogen into the reduction furnace as a reducing agent until no condensed water appears in the outlet gas. After cooling, nanometer zero-valent iron is obtained.

[0050] (3) Pass air at 8mL / min into the quartz tube to slowly oxidize the above-mentioned nano-zero-valent iron. After 24 hours, a "shell-core" nano-zero-valent iron stable in air is obtained, with a 5nm iron oxide layer on the surface. The transmission electron microscope image of the air-stable nano-zero-valent iron prepared in this example is as follows: figure 1 As shown...

Embodiment 2

[0052] When preparing nanometer zero-valent iron, the precursor can be limonite and hematite instead of goethite, and the others are the same as in Example 1.

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Abstract

The invention discloses air-stable nano zero-valent iron as well as a preparation method and application thereof. Natural iron ores of goethite, limonite and hematite and the like are used as precursors, hydrogen is used as a reducing agent for high-temperature reduction to prepare the nanometer zero-valent iron, then the nanometer zero-valent iron is slowly oxidized with air, and the iron oxide layer with 3-5 nm is formed on the surface of the nanometer zero-valent iron. According to the method and the application, used materials are cheap and easily available materials, the preparation method is simple, the cost is low, no additional elements are introduced in the preparation process, and toxic and harmful elements are not contained; and the iron ions released in the water treatment process can further form a flocculating agent to remove phosphate radicals and other pollutants.

Description

technical field [0001] The invention belongs to the technical field of water treatment, in particular to an air-stable nanometer zero-valent iron and its preparation method and application. Background technique [0002] Groundwater is one of the important sources of drinking water. With the rapid development of industry and agriculture, and the unreasonable disposal of domestic sewage, solid waste and industrial wastewater, groundwater in all countries in the world has been polluted to varying degrees. Pollutants include halogenated organic compounds, nitrates and heavy metals etc. Contaminated groundwater can be a hazard to human health. [0003] The problem of non-point source pollution of groundwater requires in-situ remediation of groundwater remediation technology. Although reverse osmosis, ion exchange and electrodialysis have been successfully applied to the treatment of drinking water, they are difficult to use due to the complexity of the technology. Repair in sit...

Claims

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Application Information

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IPC IPC(8): B22F1/02B22F9/22C02F1/00B82Y30/00B82Y40/00C02F103/06
CPCB82Y30/00B82Y40/00C02F1/00B22F9/22C02F2103/06B22F1/07B22F1/145B22F1/16
Inventor 黄晓鸣潘敏
Owner XIAMEN UNIV OF TECH
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