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

A composite material and zero-valent iron technology, applied in the field of environmental restoration, can solve the problems of large amount of waste water and waste gas discharge, high cost and large-scale production, etc., and achieve the effect of high activity, low cost of raw materials and abundant sources of raw materials

Inactive Publication Date: 2019-11-22
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The former is expensive and cannot be produced on a large scale, and the production process emits a large amount of waste water and waste gas; while the latter can be produced on a large scale, but the rate of sulfur-doped zero-valent iron itself to degrade pollutants still has room for improvement

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] A planetary ball mill (dry ball mill) is used to prepare a carbon-sulfur doped zero-valent iron composite material, and the steps are as follows:

[0055] (1) Filling zirconia ball milling beads (6mm in particle size) into the ball milling jar as the ball milling medium, the filling amount is 20% of the volume of the ball milling jar;

[0056] (2) Fill 0.134g elemental sulfur powder and 2.341g iron powder (particle size less than 1mm) and 0.025g biochar powder particles (particle size is less than 1mm) (mass fractions are 5.3%, 93.7%, 1% respectively) Mix in the ball mill tank and fill the tank with nitrogen;

[0057] (3) Adjust the rotation speed of the ball mill to 500rpm, and continue ball milling for 20 hours;

[0058] (4) Under the condition of nitrogen protection, the ball milling medium and the ball milling product are separated by a screen to obtain a carbon-sulfur-doped zero-valent iron composite material.

[0059] The activity of the above materials was test...

Embodiment 2

[0062] A sand mill (wet ball mill) is used to prepare a carbon-sulfur doped zero-valent iron composite material, and the steps are as follows:

[0063] (1) Filling zirconia ball milling beads (0.3-0.4 mm in particle size) into the ball milling chamber as the ball milling medium, the filling amount being 20% ​​of the volume of the ball milling chamber;

[0064] (2) 13.4g elemental sulfur powder and 234.1g iron powder (particle size is less than 1mm) and 2.5g biochar powder particles (particle size is less than 1mm) (mass fraction is respectively 5.3%, 93.7%, 1%) into In the mixer, and add 20L ethanol as ball milling solvent;

[0065] (3) Adjust the linear speed of the ball mill to 13m / s, and continue ball milling for 20 hours;

[0066] (4) After the ball milling is completed, a magnet is used to separate the ball milling solvent from the ball milling product to obtain a carbon-sulfur-doped zero-valent iron composite material.

[0067] The activity of the above materials was t...

Embodiment 3

[0070] This embodiment is tested with reference to Example 1, using a planetary ball mill, and the ball milling raw materials are biochar (particle diameter less than 1mm), reduced iron powder (particle diameter less than 1mm), elemental sulfur powder, other technical parameters and results are shown in the following table Show:

[0071]

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Abstract

The invention discloses a preparation method of a carbon-sulfur doped zero-valent iron composite material, which comprises the following the step: proportionally mixing and ball-milling a sulfur reagent, iron powder and carbon powder to obtain the carbon-sulfur doped zero-valent iron composite material; the sulfur reagent is elemental sulfur powder, iron sulfide powder or pyrite powder; the mass percentage ratio of the sulfur reagent to the iron powder to the carbon powder is (0.5-20): (70-99): (0.5-10). The sulfur reagent, the iron powder and the carbon powder are mixed and then subjected toball milling to obtain the carbon-sulfur doped zero-valent iron composite material, and the carbon-sulfur doped zero-valent iron composite material can be used for in-situ removal and degradation of heavy metal pollutants, pesticide pollutants, azo dye pollutants, halogenated organic matter pollutants and / or nitro organic matter pollutants in underground water and soil and has high removal and degradation efficiency.

Description

technical field [0001] The invention relates to the technical field of environmental restoration, in particular to a preparation method and application of a carbon-sulfur-doped zero-valent iron composite material. Background technique [0002] For more than 20 years, the in-situ remediation technology of groundwater based on zero-valent iron has received extensive attention and in-depth research at home and abroad. Due to its strong reducibility (Fe 2+ +2e - → Fe(s), E 0 =-0.44V), and the source is abundant and the price is low, so it is widely used in the field of environmental restoration to remove and degrade organic or inorganic pollutants. Since the beginning of this century, the discovery of nanometer zero-valent iron and its application in the field of environment have brought this technology into a new stage. [0003] However, there are still many technical defects in the large-scale production and practical engineering application of nano-zero-valent iron, such ...

Claims

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Application Information

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IPC IPC(8): C02F1/70B09C1/00B09C1/08C02F1/28C02F101/20C02F101/30C02F101/36C02F101/38
CPCB09C1/002B09C1/08B09C2101/00C02F1/281C02F1/283C02F1/705C02F2101/20C02F2101/306C02F2101/308C02F2101/36C02F2101/38
Inventor 何锋谷亚威蔡世超
Owner ZHEJIANG UNIV OF TECH
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