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Sodium silicate modified zero-valent iron composite material as well as preparation method and application thereof

A composite material and sodium silicate technology, 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, poor selectivity, etc., and achieve the effects of inhibiting cold welding, increasing fracturing rate, and easy operation.

Pending Publication Date: 2022-07-12
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Sodium silicate modified zero-valent iron composite material as well as preparation method and application thereof
  • Sodium silicate modified zero-valent iron composite material as well as preparation method and application thereof
  • Sodium silicate modified zero-valent iron composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Preparation of NSzero-mZVI by Planetary Ball Mill bm , the steps are as follows: (1) put 20% of the cavity volume of zirconia balls (particle size 6mm) into the ball mill as grinding media; (2) weigh 0.00011g of anhydrous sodium silicate and 2.49989g of zero-valent iron powder (The mass ratio of anhydrous sodium silicate and iron is 1:20000) placed in the ball mill tank, and filled with argon gas; (3) turn on the ball mill, adjust the ball milling speed to 400rpm, and mill the ball for 20 hours; (4) in the Under nitrogen atmosphere, the prepared NSzero-mZVI was screened with a mesh bm Separated from grinding media to obtain NSzero-mZVI bm finished product.

Embodiment 2

[0038] Preparation of NSzero-mZVI by Planetary Ball Mill bm , the steps are as follows: (1) put 20% of the cavity volume of zirconia balls (particle size 6mm) into the ball mill as grinding media; (2) weigh 0.00044g anhydrous sodium silicate and 2.49956g zero-valent iron powder (The mass ratio of anhydrous sodium silicate and iron is 1:5000) placed in the ball mill tank, and filled with argon gas in the tank; (3) turn on the ball mill, adjust the ball milling speed to 400rpm, and mill the ball for 20 hours; (4) in the Under nitrogen atmosphere, the prepared NSzero-mZVI was screened with a mesh bm Separated from grinding media to obtain NS H2O -mZVI bm finished product.

Embodiment 3

[0040] Preparation of NSzero-mZVI by Planetary Ball Mill bm , the steps are as follows: (1) put 20% of the cavity volume of zirconia balls (particle size 6mm) into the ball mill as grinding media; (2) weigh 0.00055g anhydrous sodium silicate and 2.49978g zero-valent iron powder (The mass ratio of anhydrous sodium silicate and iron is 1:4000) placed in the ball mill tank, and filled with argon gas in the tank; (3) turn on the ball mill, adjust the ball milling speed to 400rpm, and mill the ball for 20 hours; (4) in the Under nitrogen atmosphere, the prepared NSzero-mZVI was screened with a mesh bm Separated from grinding media to obtain NS H2O -mZVI bm finished product.

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Abstract

The invention discloses a preparation method and application of a sodium silicate modified zero-valent iron composite material, and the preparation method comprises the following steps: in a vacuum or inert gas atmosphere, respectively mixing anhydrous sodium silicate with iron powder according to a mass ratio of 1: 2000-20000, mixing sodium silicate nonahydrate with iron powder according to a mass ratio of 1: 20-40, and carrying out ball milling to obtain the sodium silicate modified zero-valent iron composite material after ball milling is finished. According to the method, sodium silicate and iron powder are mixed and then subjected to ball milling, and sodium silicate is used as a process control agent and is adsorbed on new surfaces of particles; and the state of the particle surface is changed by hindering collision required by cold welding among metals and reducing the surface activity of powder particles, so that cold welding is inhibited, the fracturing rate among the particles is increased, and finally the removal efficiency of the sodium silicate modified zero-valent iron composite material on alkane and halogenated volatile 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 sodium silicate 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. 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 remediation material, zero-valent iron has been widely used in abiotic reductive dechlorination and degradation of chlorinated organic pollutants. Chlorinated organic compounds in groundwater can be effectively degraded into non-toxic or low-toxic hydrocarbons through a permeable reaction barrier formed by zero-valent iron. [0004] However, zero-val...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/70C02F101/20C02F101/32C02F101/36C02F103/06
CPCC02F1/705C02F2101/32C02F2101/36C02F2103/06C02F2101/20Y02P10/20
Inventor 巩莉郑静胡瑶何锋
Owner ZHEJIANG UNIV OF TECH
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