Magnetic nanometer material for processing organic pollutants

An organic pollutant and magnetic nanotechnology, applied in the fields of nanomaterials and environmental science, can solve the problems of difficult large-scale extraction, high cost, variability, etc., and achieve high catalytic efficiency, good thermal stability, and no secondary pollution. Effect

Inactive Publication Date: 2009-10-07
INSITUTE OF BIOPHYSICS CHINESE ACADEMY OF SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the poor stability of the protein, it is easily denatured and inactivated in the natural environment, coupled with the high cost and difficulty in large-scale extraction, the enzyme-catalyzed method is still in the laboratory research and has not been widely used.

Method used

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  • Magnetic nanometer material for processing organic pollutants
  • Magnetic nanometer material for processing organic pollutants
  • Magnetic nanometer material for processing organic pollutants

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1. Magnetic nanomaterials can catalyze H 2 o 2 Generate OH free radicals.

[0026] Reagent: 5,5'-dimethyl-1-pirroline-N-oxide (DMPO) was purchased from Sigma-Aldrich Inc (USA). 30% H 2 o 2 and phenol and Fe 3 o 4 Synthetic materials of magnetic nanoparticles (ammonia water, ferric chloride hexahydrate) were purchased from Beijing Chemical Reagent Company. The magnetic nanomaterials used are synthesized by hydrothermal method (see Ma, M., et al.J Magn Mater, 268, 33 (2004) and Sun, Y.-k., et al.Colloids and Surfaces A, 245, 15(2004)).

[0027] Method: Take 12μg Fe 3 o 4 Magnetic nanomaterials (particle size 13nm), add 125 μl pH3.0 deionized water, add 4 μl phenol (100 mM, soluble in water) and 1 μl 30% H 2 o 2 . At different reaction times, 40 μl of the reaction product was taken out and mixed with 10 μl of DMPO (500 mM), and the content of ·OH free radicals in the solution was measured by ESR.

[0028] Result: when Fe 3 o 4 magnetic nanomaterials a...

Embodiment 2

[0029] Example 2. Magnetic nanomaterials can catalyze the degradation of phenol.

[0030] Reagent: 30% H 2 o 2 , 4-aminoantipyridine (4-AAP), sodium bicarbonate (NaHCO 3 ), potassium ferricyanide (K 3 Fe(CN) 6 ) and phenol and Fe 3 o 4 Synthetic materials of magnetic nanoparticles (ammonia water, ferric chloride hexahydrate) were purchased from Beijing Chemical Reagent Company. The magnetic nanomaterials used are synthesized by hydrothermal method (see Ma, M., et al.J Magn Mater, 268, 33 (2004) and Sun, Y.-k., et al.Colloids and Surfaces A, 245, 15(2004)).

[0031] Method: Take 12μg Fe 3 o 4 and Fe 2 o 3Magnetic nanomaterials (particle size 13nm), were added to 125 μl of deionized water with pH 3.0, 4 μl of phenol (100 mM, soluble in water) and 1 μl of 30% H 2 o 2 . At different reaction times, remove 2 μl of the reaction product with 78 μl of NaHCO 3 (0.25M) was mixed and added to a 96-well ELISA plate. Then add 10 μl K 3 Fe(CN) 6 (83.4mM, dissolved in 0.25M...

Embodiment 3

[0033] Example 3.H 2 o 2 Regulate Fe 3 o 4 Catalytic Efficiency of Magnetic Nanomaterials

[0034] Reagent: horseradish peroxidase (Horseradish Peroxidase, HRP, EC 1.11.1.7, >300 units / mg), purchased from Sigma-Aldrich Inc. (USA). 30%H 2 o 2 , 4-aminoantipyridine (4-AAP), sodium bicarbonate (NaHCO 3 ), potassium ferricyanide (K 3 Fe(CN) 6 ) and phenol and Fe 3 o 4 The synthetic materials of magnetic nanoparticles were purchased from Beijing Chemical Reagent Company.

[0035] Method: Take 12μg Fe 3 o 4 Magnetic nanomaterials (particle size 13nm) were added to 125 μl of deionized water with pH 3.0, and then 4 μl of phenol (100 mM, dissolved in water) was added. Another 1.5 μg of HRP was added to 125 μl of Tris-HCl buffer (0.1 M, pH 8.0), followed by 4 μl of phenol (100 mM, dissolved in water). Add varying amounts of 0.01 μl to 16 μl of 30% HO to each parallel reaction 2 o 2 , reacted for 3 hours. Take 2 μl of the reaction product to measure the phenol concentrat...

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Abstract

The invention relates to a magnetic nanometer material for processing organic pollutants. It is found that the magnetic nanometer material has the capability of catalyzing H2O2 to generate a large numbers of hydroxyl radicals and can be widely applied to process various poisonous and harmful substances in the environment. For example, the magnetic nanometer material can be utilized to oxidize phenol in sewages, and the final clearance rate can reach more than 95 percent. The invention provides a novel reagent and a novel method for degrading the organic pollutants. Compared with a convention Fenton reagent and a peroxydase catalyzing method, the magnetic nanometer material has the advantages of low cost, easy preparation, high stability, no secondary pollution and recovery for repeated use. The novel functions of the magnetic nanometer material have great values in the aspects such as sewage disposal, and the like.

Description

technical field [0001] The invention belongs to the fields of nanomaterial science and environmental science. Specifically, the present invention relates to the application of magnetic nanomaterials as redox reaction catalysts, and methods for applying them to organic pollutant treatment. Background technique [0002] Phenol and its analogs are common organic pollutants in industrial wastewater, which are highly toxic and difficult to be degraded by microorganisms in the environment. Currently common treatment methods include physical adsorption, chemical oxidation and biodegradation. Among them, the chemical oxidation of phenol and its analogues is the most studied and widely used method based on the principle of Fenton catalysis. [0003] Fenton's catalytic method has the advantages of wide range of substrates, low cost and simple process, but its reaction products contain a large amount of iron ions and toxic sludge, which requires further treatment processes. For this...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01J23/94C02F1/70
Inventor 阎锡蕴张锦彬高利增杨东玲冯静
Owner INSITUTE OF BIOPHYSICS CHINESE ACADEMY OF SCIENCES
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