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Method for rapidly degrading decabromodiphenyl oxide in organic series by nano Pd/C catalyst

A decabromodiphenyl ether and rapid degradation technology, which is applied in the field of rapid degradation of decabromodiphenyl ether, can solve the problems of short degradation time, inability to degrade decabromodiphenyl ether, etc., and achieves easily controllable conditions, shortened degradation time and operation. simple effect

Inactive Publication Date: 2010-09-01
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the existing technical defects that the use of zero-valent metals cannot degrade decabromodiphenyl ether in organic systems, and provide a nano-Pd / C catalyst that can degrade decabromodiphenyl ether in organic systems with short degradation time and reusable catalysts. Diphenyl ether method

Method used

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  • Method for rapidly degrading decabromodiphenyl oxide in organic series by nano Pd/C catalyst
  • Method for rapidly degrading decabromodiphenyl oxide in organic series by nano Pd/C catalyst
  • Method for rapidly degrading decabromodiphenyl oxide in organic series by nano Pd/C catalyst

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Experimental program
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Effect test

Embodiment 1

[0025] (1) Performance index of nano-Pd / C powder catalyst

[0026] The mass percentage of Pd is 5.0±0.05%, the particle size is 2.5nm; the particle size of C is 74~104μm, and the specific surface area is ≥1100m 2 / g, metal surface area 50~65m 2 / g. SEM photo figure 1 shown.

[0027] (2) Types of solvent and hydrogen source: a mixed solution of n-hexane, isopropanol and methanol is the solvent, wherein n-hexane / isopropanol / methanol=100:99:1 (volume ratio), and isopropanol is the main hydrogen source.

[0028] (3) Debromination degradation reaction of decabromodiphenyl ether

[0029] Sodium hydroxide or potassium hydroxide is added to the mixed solution of decabromodiphenyl ether in n-hexane / isopropanol / methanol with a concentration of 100 mg / l to adjust the pH value of the reaction system to between 10 and 11. Take 5ml of the above reaction solution into a 25ml serum bottle, add 30mg of Pd / C powder, and finally put it into a stirrer, tighten the lid, and wrap it in tinfoil...

Embodiment 2

[0040] (1) Nano Pd / C powder catalyst performance index, same as embodiment 1.

[0041] (2) Types of solvent and hydrogen source: toluene, a mixed solution of isopropanol and methanol is a solvent, wherein toluene / isopropanol / methanol=100:99:1 (volume ratio), and isopropanol is the main hydrogen source.

[0042] (3) Debromination degradation reaction of decabromodiphenyl ether

[0043] Potassium hydroxide was added to the toluene / isopropanol / methanol reaction solution of decabromodiphenyl ether with a concentration of 498 mg / l to adjust the pH value of the reaction system to between 10 and 11. Take 5ml of the above reaction solution into a 25ml serum bottle, add 40mg of Pd / C powder, and finally put it into a stirrer, tighten the lid, and wrap it in tinfoil to avoid light. The reaction was carried out in a constant temperature magnetic stirrer. When the temperature of the water in the water bath rose to 50° C., the serum bottle was placed in it, and the reaction was started by ...

Embodiment 3

[0045] (1) Nano Pd / C powder catalyst performance index, same as embodiment 1.

[0046] (2) Type of hydrogen source: the mixed solution of isopropanol and methanol is the hydrogen source, wherein isopropanol / methanol=99:1 (volume ratio), and isopropanol is the main hydrogen source.

[0047] (3) Debromination degradation reaction of decabromodiphenyl ether

[0048] Add an equal volume of isopropanol / methanol solution in the waste TV casing pyrolysis oil of decabromodiphenyl ether at a concentration of 100mg / l, and the volume ratio of waste and old TV casing pyrolysis oil, isopropanol and methyl alcohol is 100: 99:1 (25ml of waste TV shell pyrolysis oil, 24.75ml of isopropanol, and 0.25ml of methanol). The main composition of the waste TV shell pyrolysis oil is shown in Table 1. It can be seen that the pyrolysis oil is a complex system with aromatic hydrocarbon substance styrene as the main component, and its content in the pyrolysis oil is 37.87%. . The relative content in th...

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Abstract

The invention relates to a method for rapidly degrading polybrominated diphenyl ether by nano Pd / C catalyst, comprising the steps of: adjusting the pH value of organic series containing decabromodiphenyl oxide to be 10-11, adding the nano Pd / C catalyst, reacting for more than 4h, and controlling the reaction temperature to be 50+ / -5DEG C, wherein the nano Pd / C is solid particles with Pd loaded on activated carbon; the Pd has the mass percent of 5.0+ / -0.05%, and the nano Pd / C has the concentration of 6-20mg / ml in the organic series; the organic series is alcoholic solution of fatty hydrocarbon or aromatic hydrocarbon, wherein the fatty hydrocarbon is normal hexane, and the aromatic hydrocarbon is waste TV shell pyrolysis oil with the main components of methylbenzene or styrene; and as having large specific surface, the nano Pd / C can rapidly aborb and degrade the polybrominated diphenyl ether, and greatly reduces the degradation time compared with nano reducing metal powder. After being used, the nano Pd / C powder can be repeatedly used by being washed by alcohol and water.

Description

technical field [0001] The invention relates to a method for rapidly degrading decabromodiphenyl ether, in particular to a method for rapidly degrading decabromodiphenyl ether in an organic system with a nanometer Pd / C catalyst. Background technique [0002] Polybrominated diphenyl ethers have similar physicochemical properties to environmental pollutants such as polychlorinated biphenyls, and both belong to toxic, lipophilic and persistent organic pollutants. Because of their large production volume and wide range of applications, they can be detected in a variety of environmental samples, human tissues and animals. In 2003, the "WEEE Directive" and "RoHS Directive" promulgated by the European Union countries once again aroused strong repercussions from all over the world. Therefore, research on the degradation and elimination of PBDEs has been carried out so far. Especially for the degradation of polybrominated diphenyl ethers in water, especially the degradation of decab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/34A62D101/28
Inventor 陈烈强陈源彭绍洪甘焕艳
Owner SOUTH CHINA UNIV OF TECH
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