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Preparation method and application of stearic acid modified zero-valent iron composite material

A technology of composite materials and stearic acid, applied in the field of environmental chemistry, can solve the problems of hindering the contact of active ingredients, reducing the activity of zero-valent iron, and poor transmission, and achieve the effects of inhibiting cold welding, increasing fracturing rate, and low preparation cost

Pending Publication Date: 2020-12-29
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, zero-valent iron also has many defects in the actual engineering application process, such as poor selectivity to pollutants, reaction with water and other dissolved oxidizing substances, and interaction with soil minerals; poor transport, and easy to be intercepted by soil media; The oxide film on the surface will hinder the contact of active ingredients with target pollutants, thereby reducing the activity of zero-valent iron and limiting the effect of dechlorination

Method used

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  • Preparation method and application of stearic acid modified zero-valent iron composite material
  • Preparation method and application of stearic acid modified zero-valent iron composite material
  • Preparation method and application of stearic acid modified zero-valent iron composite material

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Effect test

Embodiment 1

[0035] Preparation of SA-mZVI by planetary ball mill bm , the steps are as follows: (1) zirconia ball milling beads (6mm in particle size) with 20% cavity volume are packed into the ball mill jar as the grinding medium; (2) weigh 0.00125g stearic acid and 2.49875g zero-valent iron powder (hard The mass ratio of fatty acid and iron (1:2000) is placed in the ball mill jar, and is full of argon in the jar; (3) open ball mill, ball mill speed is transferred to 400rpm, ball mill 20 hours; (4) under nitrogen atmosphere, Sieve the prepared SA-mZVI bm Separation from grinding media to obtain SA-mZVI bm finished product.

Embodiment 2

[0037] Preparation of SA-mZVI by planetary ball mill bm , the steps are as follows: (1) the zirconia ball milling beads (6mm in particle diameter) of 20% cavity volume are packed in the ball mill jar as grinding medium; (2) take by weighing 0.0025g stearic acid and 2.4975g zero-valent iron powder ( The mass ratio of stearic acid and iron (1:1000) is placed in the ball mill jar, and is filled with argon in the jar; (3) Open the ball mill, adjust the ball mill speed to 400rpm, and ball mill for 20 hours; (4) Under nitrogen atmosphere , the prepared SA-mZVI was sieved bm Separation from grinding media to obtain SA-mZVI bm finished product.

Embodiment 3

[0039] Preparation of SA-mZVI by planetary ball mill bm , the steps are as follows: (1) the zirconia ball milling beads (6mm in particle diameter) of 20% cavity volume are packed in the ball mill jar as grinding medium; (2) take by weighing 0.0125g stearic acid and 2.4875g zero-valent iron powder ( The mass ratio of stearic acid and iron (1:200) is placed in the ball mill jar, and is filled with argon in the jar; (3) Open the ball mill, adjust the ball mill speed to 400rpm, and ball mill for 20 hours; (4) Under nitrogen atmosphere , the prepared SA-mZVI was sieved bm Separation from grinding media to obtain SA-mZVI bm finished product.

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Abstract

The invention discloses a preparation method and application of a stearic acid modified zero-valent iron composite material. The preparation method comprises the following steps: in a vacuum or inertgas atmosphere, mixing stearic acid and iron powder according to the mass ratio of 1: 125-2000, then carrying out ball milling, and obtaining the stearic acid modified zero-valent iron composite material after ball milling is finished. According to the method, the stearic acid and the iron powder are mixed and then subjected to ball milling, and the stearic acid is used as a process control agentto be adsorbed onto new surfaces of particles; and the particle surface state is changed by hindering collision required by intermetallic cold welding and reducing the surface activity of the powder particles, so that cold welding is inhibited, the intergranular fracturing rate is increased, and finally the removal efficiency of the stearic acid modified zero-valent iron composite material on heavy metals and organic pollutants is improved.

Description

technical field [0001] The invention relates to the technical field of environmental chemistry, and mainly relates to a preparation method and application of a stearic acid-modified zero-valent iron composite material. Background technique [0002] At present, groundwater pollution in my country has become a common phenomenon, especially shallow groundwater pollution, and the degree of pollution continues to aggravate, and the scope of pollution is expanding day by day. Chlorinated organic compounds are one of the common groundwater pollutants. [0003] For decades, zero-valent iron particles have received extensive attention at home and abroad due to their abundant sources, low cost, and strong reducibility. As an efficient repair material, zero-valent iron has been widely used in the abiotic reductive dechlorination degradation of chlorinated organic pollutants. Chlorinated organic compounds in groundwater can be effectively degraded into non-toxic or low-toxic hydrocarb...

Claims

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Application Information

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IPC IPC(8): B22F9/04B22F1/00C02F1/70C02F1/00C02F101/00C02F101/10C02F101/20C02F101/22C02F101/36C02F101/38C02F103/06
CPCB22F9/04C02F1/70C02F1/00B22F2009/043C02F2103/06C02F2101/36C02F2101/38C02F2101/20C02F2101/22C02F2101/103C02F2101/006B22F1/14
Inventor 巩莉胡瑶何锋
Owner ZHEJIANG UNIV OF TECH
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