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Nano-level zero-valent iron carrier as well as preparation method and application thereof

A zero-valent iron, nano-scale technology, applied in the field of material chemistry, can solve the problems of loss of activity and the limitation of mass transfer of organic pollutants, and achieve the effect of promoting mass transfer, avoiding the formation of secondary pollutants, and overcoming easy agglomeration.

Active Publication Date: 2017-10-13
BEIJING UNIV OF AGRI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nano-zero-valent iron is easy to agglomerate, and it is easy to be oxidized in the air and lose its activity. At the same time, the problem of mass transfer of organic pollutants also causes limitations.

Method used

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  • Nano-level zero-valent iron carrier as well as preparation method and application thereof
  • Nano-level zero-valent iron carrier as well as preparation method and application thereof
  • Nano-level zero-valent iron carrier as well as preparation method and application thereof

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preparation example Construction

[0033] The nano-scale zero-valent siderophores prepared by the preparation method provided by the present invention can have an iron loading of more than 20%, and the applicable range is 20%-29%, or 24%-29%, 27%-29%, and the highest can be Up to 28% ~ 29%; Fe 0 The average particle size can reach below 40nm.

[0034] A method for preparing nano-scale zero-valent siderophores, using cationic surfactants as templates and L-ascorbic acid as auxiliary template modifiers to react with silicon sources in alkaline solution systems to prepare modified silicon-based mesoporous molecular sieves ;

[0035] Introduce Fe into the precursor of the modified silicon-based mesoporous molecular sieve by in-situ synthesis before the modified silicon-based mesoporous molecular sieve is released from the mold 2+ , and use a reducing agent to reduce under the protection of an inert gas; the modified silicon-based mesoporous molecular sieve loaded with zero-valent iron obtained after demoulding is...

Embodiment

[0056] 1. Experimental part

[0057] 1.1. Reagents and instruments

[0058] The main reagents for synthesizing the mesoporous molecular sieve matrix of the present invention include ethyl orthosilicate, cetyltrimethylammonium bromide, ammonia water, and ethanol; the modifying reagents include L-ascorbic acid; the medicine of the catalytic active part includes ferrous sulfate heptahydrate ; The catalytic degradation probe has p-chlorophenol. All the above reagents were of analytical grade and used directly without any extraction.

[0059] The present invention uses XRD (Expert Powder) to analyze the order degree of the carrier molecular sieve and the prepared materials, uses SEM and TEM (JEM-2100F) to characterize the topological structure of the materials; uses N2-adsorption and desorption (3H-2000A) to investigate Pore ​​channel and specific surface area characteristics of the carrier; use ultraviolet-visible spectrophotometer (UV-1700) and atomic absorption spectrometer (T...

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Abstract

The invention relates to the technical field of material chemistry, in particular to a nano-level zero-valent iron carrier as well as a preparation method and application thereof. The nano-level zero-valent iron carrier is obtained by loading zero-valent iron through a modified silicon-based mesoporous molecular sieve; the iron loading amount is less than or equal to 29 percent; the average particle of Fe0 is 40 nm or below, and the mesoporous structure of the material can be retained; HPLC (High Performance Liquid Chromatography)-based analysis of products, which are obtained by degrading parachlorophenol through the material, in water shows that the degradation rate of the parachlorophenol subjected to ultrasonic treatment for 4 hours can be up to 92 percent. Innovative use of L-ascorbic acid serving as a bifunctional agent improves the physical and chemical properties of the material, provides a new idea for synthesis of the material and provides a reference for degradation of chlorine-containing organic matters in the environment.

Description

technical field [0001] The invention relates to the technical field of material chemistry, in particular to a nanoscale zero-valent iron carrier and its preparation method and application. Background technique [0002] Chlorophenols (Chlorophenols, CPs) are persistent pollutants with strong toxicity and strong "three-cause" effects on organisms. Extensive use in the field of industry and agriculture leads to the direct or indirect entry of chlorophenol pollutants into natural water bodies, thus causing extremely bad effects on the natural environment. Both the US EPA and the China Environmental Monitoring Center list most of the isomers of chlorophenols as priority pollutants. [0003] Since the American scholar Gillham R.W&O.Hannesin S.F proposed the use of iron filings to remediate groundwater pollution in the middle of the 20th century, with the further exploration of researchers, micro-iron, nano-iron, and nano-zero-valent iron (Fe 0 ) catalytic degradation of chloroph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/03C02F1/72C02F101/34C02F101/36
CPCC02F1/725B01J29/0333C02F2101/345C02F2101/36B01J2229/18B01J35/393
Inventor 郑燕英马晓龙刘昊
Owner BEIJING UNIV OF AGRI
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