Method for degrading polybrominated diphenyl ethers using surface active agent solubilization combined with UV technique

A technology of surfactants and polybrominated diphenyl ethers, applied in the field of degrading polybrominated diphenyl ethers, to achieve the effect of not easy to adsorb, easy to obtain, and low toxicity

Inactive Publication Date: 2009-06-24
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, there is no report on the degradation of PBD

Method used

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  • Method for degrading polybrominated diphenyl ethers using surface active agent solubilization combined with UV technique
  • Method for degrading polybrominated diphenyl ethers using surface active agent solubilization combined with UV technique
  • Method for degrading polybrominated diphenyl ethers using surface active agent solubilization combined with UV technique

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Example 1: Photolysis of BDE-99 in Brij 35 Micellar Solution

[0047] The Brij 35 used in the present invention was purchased from Amresco Company in the United States, and some of its physical and chemical properties are shown in Table 1. Brij 35 molecular monomer uses dodecyl chain as hydrophobic group, and polyoxyethylene ether chain with polymerization degree of 23 is hydrophilic group, and the concentration of surfactant is about 192mg L -1 form micelles.

[0048] Take 500 μL of BDE-99 solution (5 mg L dissolved in n-hexane) -1 ), put it into a 50mL brown volumetric flask, pass high-purity nitrogen (99.999%) to dry n-hexane gently, and make BDE-99 adhere to the bottom of the volumetric flask in solid form. Add 500 or 2000mg L -1 The Brij 35 solution reached the scale line of the volumetric flask; under the conditions of normal temperature and pressure and protected from light, the brown volumetric flask was solubilized in a water bath ultrasonic device, the outp...

Embodiment 2

[0051] Example 2: Photolysis of BDE-99 in Brij 58 Micellar Solution

[0052] Brij 58 used in the present invention was purchased from Sigma Company in the United States, and some of its physical and chemical properties are shown in Table 1. Brij 58 molecular monomer uses hexadecyl chain as hydrophobic group, and polyoxyethylene ether chain with polymerization degree of 20 is hydrophilic group, and the concentration of surfactant is about 90mg L -1 form micelles.

[0053] Take 500 μL of BDE-99 solution (5 mg L dissolved in n-hexane) -1 ), put it into a 50mL brown volumetric flask, pass high-purity nitrogen (99.999%) to dry n-hexane gently, and make BDE-99 adhere to the bottom of the volumetric flask in solid form. Add 500 or 2000mg L -1 The Brij 58 solution reached the scale line of the volumetric flask. Under the conditions of normal temperature and pressure and protected from light, the brown volumetric flask was solubilized in a water bath ultrasonic device. The output po...

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Abstract

The invention discloses a method for degrading polybrominated diphenyl ether by combining surfactant solubilization and UV technology, which belongs to the technical field of environment-friendly halogenated aryl hydrocarbon organic pollutant treatment. The method adopts the technical proposal that surfactant solubilization of 2,2',4,4',5-pentabromated diphenyl ether is improved in a hydrophobic environment provided by nonionic surfactant micelle (Brij 35 or Brij 38) under the conditions of normal temperature and pressure, water bath and ultrasonic sound; and the 2,2',4,4',5-pentabromated diphenyl ether which is dissolved in a surfactant solution is subjected to UV advanced treatment at normal temperature and pressure and then subjected to stepwise debromination reaction or intermolecular elimination and annulation reaction to generate intermediate products, namely PBDEs from monobromo to tetrabromo and polybrominated dibenzofuran (PBDFs) from monobromo to tetrabromo. The whole technology has short time consumption and high efficiency, and the method can selectively degrade target pollutant without damaging a surfactant, provides convenience for recycling of the surfactant, and has good application prospect in the aspect of remediation of soil polluted by the PBDEs in electronic waste recycling sites.

Description

technical field [0001] The invention relates to a method for degrading polybrominated diphenyl ethers (PBDEs), and belongs to the technical field of environmental protection halogenated aromatic hydrocarbon organic pollutant treatment. Background technique [0002] PBDEs are a class of brominated flame retardants (BFRs) widely used in electronic appliances, plastics, textiles and other products. The main products are deca-BDE, octa-BDE and penta-BDE; in 2001, three PBDEs products The world's total production is 67,440 metric tons, second only to tetrabromobisphenol A (TBBPA), another BFRs. It is worth noting that, unlike TBBPA, PBDEs are added to various raw materials through physical mixing, so PBDEs are more likely to be released into the environment during the initial production and use, as well as the recycling and disposal of products containing PBDEs. From the 1970s to the present, PBDEs have not only been detected in a variety of environmental samples, but the conten...

Claims

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Application Information

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IPC IPC(8): A62D3/176A62D101/22
Inventor 黄俊李雪余刚邓述波
Owner TSINGHUA UNIV
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