Method for activating persulfate to degrade odor compound in water by virtue of magnetic nanoparticle

A technology of magnetic nanoparticles and persulfate, applied in chemical instruments and methods, magnetic field/electric field water/sewage treatment, water/sewage treatment, etc., can solve problems such as inability to catalyze and oxidize odor substances well, and achieve improvement Catalytic efficiency, high effective utilization rate, and large specific surface area

Inactive Publication Date: 2017-08-18
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Transition metal ion activation is more widely used due to less energy consumption and low cost, but the addition of Fe 2+ , excess Fe 2+ will consume SO 4 - , and Fe 2+ Reacts extremely quickly with sulfate radicals, Fe 2+ will rapidly convert Fe 3+ Precipitation is formed, this method is not very good for catalytic oxidation to remove odor substances

Method used

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  • Method for activating persulfate to degrade odor compound in water by virtue of magnetic nanoparticle
  • Method for activating persulfate to degrade odor compound in water by virtue of magnetic nanoparticle
  • Method for activating persulfate to degrade odor compound in water by virtue of magnetic nanoparticle

Examples

Experimental program
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Effect test

Embodiment 1

[0039] (1) Determination of dimethylisoborneol (2-MIB) standard by internal standard method. In the headspace bottle of 20mL, add 3g NaCl, 200uL concentration and be the IB internal standard of 10ug / L and the magnetic stirrer bar, add the dimethylisoborneol (Dimethylisoborneol ( 2-MIB), and finally add ultrapure water to prepare a 10mL water sample so that the concentration of dimethylisoborneol in each headspace bottle is 10, 50, 80, 100, 200, 500 and 1000ng / L, immediately Seal with a cap with a PTFE-coated silicone rubber gasket. Determination of Odor and Taste Substances in Water by Headspace Solid Phase Microextraction-Gas Chromatography / Mass Spectrometry. Specific steps: first place the headspace bottle in a water bath constant temperature magnetic stirrer (SHJ-2C), pierce the solid-phase microextraction needle through the sealed silica gel pad inside the bottle cap, and push out the extraction head to expose to the headspace. Set the temperature at 65°C, rotate at 300r...

Embodiment 2

[0046] On the basis of the method in Example 1, the concentration of 2-MIB is 1000ng / L, the concentration of persulfate is 0.5mmol / L, 1mmol / L, 2mmol / L and 5mmol / L, Fe 3 o 4 The concentration of nanoparticles is 100mg / L, and the reaction time is 60min. Under these conditions, the Fe 3 o 4 Nanoparticles catalyzed the degradation efficiency of different concentrations of persulfate to degrade 2-MIB. The experimental results are as image 3 shown.

[0047] This example uses Fe 3 o 4 Nanoparticles catalyzed the activation of persulfate to degrade odorous substances in water, and the degradation efficiency increased with the increase of persulfate concentration, but when the persulfate concentration exceeded 1 mmol / L, the relative degradation efficiency decreased significantly. Therefore from the consideration of economy and efficiency, the preferred persulfate concentration of this patent is 1mmol / L.

Embodiment 3

[0049] On the basis of the method in Example 1, the concentration of 2-MIB is 1000ng / L, the concentration of persulfate is 1mmol / L, Fe 3 o 4 The concentration of nanoparticles is 20mg / L, 50mg / L, 100mg / L, 200mg / L, 300mg / L and 500mg / L, and the reaction time is 60min. Under these conditions, different concentrations of Fe were measured 3 o 4 Degradation efficiency of nanoparticles catalyzed persulfate degradation of 2-MIB. The experimental results are as Figure 4 shown.

[0050] This example uses Fe 3 o 4 Nanoparticles catalyze the activation of persulfate to degrade odor and odor substances in water, and the degradation efficiency varies with Fe 3 o 4 significantly increased with increasing concentrations of nanoparticles. When Fe 3 o 4 When the concentration of nanoparticles is greater than 400mg / L, the Fe produced by hydrolysis 2+ Consumed more sulfate radicals and made the degradation efficiency lower, so the Fe used in the present invention 3 o 4 The concentra...

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Abstract

The invention relates to a method for activating persulfate to degrade an odor compound in water by virtue of a magnetic nanoparticle. The method comprises the following steps: adding the persulfate as an oxidant into the water containing the odor compound, then adding an Fe3O4 nanoparticle as a catalyst, and performing system oscillation reaction, so as to realize activation of the persulfate for degradation of the odor compound in the water by the magnetic Fe3O4 nanoparticle. According to the method, the catalyst Fe3O4 nanoparticle has high performance, and can be used for rapidly and efficiently catalyzing the persulfate to generate a sulfate free radical and oxidatively degrading the odor compound in the water, and the removal rate is detected to reach 95 percent or more. Compared with the prior art, the method has the advantages of low energy consumption, extensive reactant sources, low cost, easiness for magnetic separation of the catalyst and the like, and is environment-friendly.

Description

technical field [0001] The invention belongs to the field of water treatment, and relates to a method for degrading smell and taste substances in water, in particular to a method for degrading smell and taste substances in water by activating persulfate with magnetic nanoparticles. Background technique [0002] In recent years, with the development of my country's economy, domestic sewage, industrial wastewater and agricultural wastewater have been discharged into water bodies in large quantities. Nitrogen, phosphorus and organic matter have caused serious eutrophication of lakes, reservoirs and other water bodies, and the resulting smell and smell of water bodies has become a hot spot of concern. . The secondary metabolites (geosin and 2-methylisoborneol, etc.) secreted by algae and bacteria overgrowth are important reasons for the smell of water. The study found that the common odor substances in water mainly include geosmin (Geosmin), 2-methylisobutyric alcohol (2-MIB), 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F1/48
CPCC02F1/488C02F1/72C02F1/725C02F2303/02C02F2305/08
Inventor 唐玉霖辛怀佳
Owner TONGJI UNIV
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