Fast polybrominated biphenyl ether degrading method with nanometer iron powder

A polybrominated diphenyl ether and nano iron powder technology, which is applied in the direction of protection devices against harmful chemical agents and the like

Inactive Publication Date: 2006-03-01
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

[0009] And adopt nano-iron powder to degrade polybrominated diphenyl ethers and there is no report yet

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  • Fast polybrominated biphenyl ether degrading method with nanometer iron powder
  • Fast polybrominated biphenyl ether degrading method with nanometer iron powder
  • Fast polybrominated biphenyl ether degrading method with nanometer iron powder

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Embodiment Construction

[0018] The nano-iron powder used in the present invention is purchased from Japan Toda Kogyo Corp., and its transmission electron microscope photo is as follows figure 1 shown. The particle size distribution of most particles is between 10 and 50nm, with a diameter of 31.8m 2 / g specific surface area. Decabromodiphenyl ether was used as the initial degradation object, and a 5 mL stoppered glass tube was used as the reaction vessel. The initial concentration of BDE209 was 0.5μg / ml, the concentration of nano-iron powder was 0.125g / ml, and the degradation experiment was carried out under the conditions of normal temperature and pressure and dark conditions. Within the specified time, take three parallel reaction glass tubes and slowly add 1ml of concentrated hydrochloric acid to remove iron powder. The resulting solution is extracted three times with 0.5ml of toluene, and the combined extracts are determined by GC-ECD. The degradation products of different BDE209 were identifi...

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Abstract

The present invention is fast polybrominated biphenyl ether degrading method with nanometer iron powder. Polybrominated biphenyl ether mixture in the concentration of 1 microgram / ml is added with nanometer iron powder in the concentration of 0.2-0.3 g / ml to react for 5 min to 10 days at normal temperature and normal pressure, so as to debrominate and produce low brominated biphenyl ether. The nanometer iron powder with great specific surface area results in fast adsorption and fast degradation of polybrominated biphenyl ether and greatly shortened reaction time. The present invention has excellent application foreground in degrading chlorinated and brominated biphenyl ether and eliminating corresponding pollution.

Description

technical field [0001] The invention relates to a method for degrading polybrominated diphenyl ethers. Background technique [0002] As we all know, polybrominated diphenyl ethers are widely used as flame retardants in textiles, plastics and electronic products. In 1999, the total production of various PBDEs had exceeded 60,000 tons. They are stable to acids and bases, are not readily biodegradable, and are considered persistent organic pollutants, like PCBs. Due to their mass production and use, they have been detected in high concentrations in a variety of environmental samples, and the levels of PBDEs in human blood have increased 100-fold since 1979. Because of their possible environmental endocrine disruptor properties and neurotoxicity, their degradation and elimination work has begun to attract attention, but the research in this area has not yet been fully developed. Existing reports on the degradation of PBDE are very limited, and the literature on this aspect ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/00
Inventor 江桂斌李安邰超
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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