Method for preparing citrate nano zero-valent iron and method of activated persulfate thereof for treating organic wastewater

A technology for activating persulfate and nano-zero valent iron, which is applied in the field of water pollution treatment, can solve the problems of complex activation conditions, reduce the utilization rate of persulfate radicals, etc., and achieve high activation efficiency, enhanced recyclability, and high reaction efficiency. Effect

Active Publication Date: 2015-05-13
重庆地大工业技术研究院有限公司
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Problems solved by technology

[0007] The application provides a preparation method of citrate nano-zero-valent iron and a method for activating persulfate to treat organic wastewater, which solves the problem of using heating activation and light radiation activation peroxodisulfate activation conditions in the prior art; using ferrous ions When activating peroxodisulfate, ferrous ions will react with active free radicals, reduce the utilization rate of persulfate, and produce a large amount of iron sludge; slow down the oxidation and passivation of nano-zero-valent iron when activating peroxodisulfate, Technical Issues in Promoting the Magnetic Recovery of Nanoscale Zero-Valent Iron

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  • Method for preparing citrate nano zero-valent iron and method of activated persulfate thereof for treating organic wastewater
  • Method for preparing citrate nano zero-valent iron and method of activated persulfate thereof for treating organic wastewater
  • Method for preparing citrate nano zero-valent iron and method of activated persulfate thereof for treating organic wastewater

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Embodiment 1

[0048] figure 1It is a flow chart of a method for treating organic wastewater by using citrate nanometer zero-valent iron to activate persulfate to treat organic wastewater according to a preferred embodiment of the present application. Such as figure 1 As shown, the method for using citrate nano zero-valent iron to activate persulfate to treat organic wastewater may further comprise the steps:

[0049] Step 10, adding peroxodisulfate and citrate stabilized nano zero-valent iron to the wastewater containing organic pollutants.

[0050] Wherein, the peroxodisulfate and the citrate-stabilized nanometer zero-valent iron can be added to the organic wastewater at the same time, or can be added to the organic wastewater separately, specifically according to needs. Specifically, the peroxodisulfate can be sodium peroxodisulfate, potassium peroxodisulfate or ammonium peroxodisulfate, and the molar ratio of the peroxodisulfate and organic pollutants can be determined according to the...

Embodiment 2

[0085] Based on the same inventive concept, the application also provides a method for preparing citrate nanometer zero-valent iron, please refer to figure 2 , the preparation method of the citrate nanometer zero-valent iron comprises the following steps:

[0086] Step 110, dissolving ferrous sulfate heptahydrate and strong reducing agent in water respectively to form ferrous sulfate heptahydrate solution and strong reducing agent solution. The strong reducing agent is specifically sodium borohydride or potassium borohydride. Specifically, when the strong reducing agent is sodium borohydride, 1.112 g of ferrous sulfate heptahydrate can be dissolved in 20 mL of water, and 0.4 g of sodium borohydride can be dissolved in 50 mL of water.

[0087] Step 120, adding the sodium borohydride solution dropwise to the ferrous sulfate heptahydrate solution, and the ferrous ions of the ferrous sulfate heptahydrate are reduced to zero-valent iron. When the ferrous ion of the ferrous sulfa...

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Abstract

The invention discloses a method for preparing citrate nano zero-valent iron and a method of activated persulfate thereof for treating organic wastewater. The method for treating organic wastewater comprises the following steps: adding persulfate and stable citrate nano zero-valent iron into wastewater containing organic pollutants; uniformly mixing the stable citrate nano zero-valent iron with the persulfate, wherein the stable citrate nano zero-valent iron releases ferrous ions to react with zero-valent iron and the persulfate to generate free radicals with oxidizability, the free radicals degrade the organic pollutants in the wastewater, and the method is used for solving the problem in the prior art that activating conditions of activating the persulfate via heating activation and optical radiation activation are complicated; when the ferrous ions are used for activating the persulfate, the ferrous ions react with the active free radicals to reduce the utilization rate of peroxydisulfate and generate a large amount of iron sludge; the technical problem that the nano zero-valent iron is unlikely to recover when the nano zero-valent iron is used for activating the persulfate is at least partially overcome.

Description

technical field [0001] The invention relates to the technical field of water pollution treatment in environmental protection technology, in particular to a method for preparing citrate nanometer zero-valent iron and a method for activating persulfate to treat organic wastewater. Background technique [0002] In recent years, with the rapid development of the national economy, the contradiction between environmental pollution and the sustainable development of social economy has become increasingly prominent. At the same time, various harmful pollutants produced by water environment pollution pose a serious threat to the natural ecological environment and national health. How to effectively degrade refractory organic pollutants in the water environment has become an important research topic in the environmental field. Advanced oxidation technology degrades and mineralizes organic pollutants through the strong oxidative free radicals (mainly hydroxyl radicals and sulfate radi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72B22F9/24
CPCB22F9/24C02F1/722C02F1/725C02F2101/30
Inventor 杜江坤鲍建国傅晓艳郝义国高珺
Owner 重庆地大工业技术研究院有限公司
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