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Method for degradation of organic halide in water with immobilized metallic catalyst

An immobilized catalyst, organic halide technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, etc. , poor safety and stability, etc., to achieve safe and easy to control operations, improve activity and catalytic performance, and reduce toxicity.

Inactive Publication Date: 2008-12-03
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of them use hydrogen as the hydrogen source, the operating conditions are not easy to control, the safety and stability are poor, and it is inconvenient to use hydrogen as the hydrogen donor, and the performance of some carriers is not stable enough
Unable to meet practical application

Method used

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  • Method for degradation of organic halide in water with immobilized metallic catalyst
  • Method for degradation of organic halide in water with immobilized metallic catalyst
  • Method for degradation of organic halide in water with immobilized metallic catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] According to the preparation method of the above-mentioned metal immobilized catalyst, first prepare the metal immobilized catalyst of structural formula (2), take polychlorinated biphenyl as pollutant, concentration is 200mg / L, sewage volume is 150ml, adds 2% palladium solid catalyst 0.50 g, adding the hydrogen donor sodium formate

[0021]

[0022] 10mg, 1mL ethanol, stirred and reacted at 60°C and normal pressure for 7 hours, after filtration, the concentration of PCBs in water was determined to be 17.4mg / L, and the removal rate reached 91.3%.

Embodiment 2

[0024] Using the metal immobilized catalyst prepared in Example 1, polychlorinated biphenyls are used as pollutants, the concentration is 200mg / L, and the sewage volume is 200ml, 0.50g of 2% palladium immobilized catalyst is added, and 10ml of hydrogen donor formic acid is added. Stir and react at 40° C. and normal pressure for 10 hours. After filtration, the concentration of polychlorinated biphenyls in water is determined to be 23 mg / L, and the removal rate reaches 80.5%.

Embodiment 3

[0026] The situation of Example 1 is basically the same, except that the immobilized catalyst is 0.25g of 7% palladium immobilized catalyst, and the added hydrogen donor is 12mg of sodium formate. Other situations are the same as in Example 1, and the removal rate reaches 93%. .

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Abstract

The invention provides a method for degrading organic halides in water by a metal-supported catalyst, comprising an imidazole ligand metal (palladium or nickel) catalyst supported on silica gel. The invention is characterized in that the method comprises the following steps that: the organic halides in the water are subject to the heterogeneous catalytic reduction reaction by the catalyst under the condition that a hydrogen donor is added at a temperature of between 10 and 90 DEG C, under normal pressure for 2 to 10 hours, thereby effectively degrading the organic halides in the water. Experiments show that the method catalyzes the organic halides in the water, such as bromobenzene, polychlorobiphenyl and so on, under a mild condition with a removal rate reaching over 90 percent.

Description

Technical field: [0001] The invention belongs to the field of water treatment and water pollution prevention and control. In particular, it relates to the degradation of organic halides in water using a newly synthesized metal catalyst. Background technique: [0002] Halogenated organic pollutants are typical organic pollutants in the environment. It mainly comes from the production of chlorinated aromatic compounds (chlorobenzene, chlorinated phenol, PCBs, etc.), the production of pesticides, dyes, chlorinated solvents (trichlorethylene, carbon tetrachloride), the production of PVC plastic raw materials (chlorinated Ethylene, dichloroethylene), production waste, sewage discharge, sludge from wastewater treatment, production of aliphatic organic chlorides, etc. Most of these organic halides are highly toxic and difficult to degrade, and some organic halides have the "three effects" of "carcinogenic, teratogenic, and mutagenic" in trace amounts. Therefore, the study of an ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/70B01J31/22
CPCY02W10/37
Inventor 宁平张春敏李子燕张洪彬赵静峰邱莉周德群
Owner KUNMING UNIV OF SCI & TECH
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