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Polyhydroxy ferrous complex reduction system, and preparation method and application thereof

A polyhydroxy ferrous and complex technology, applied in the direction of reducing water/sewage treatment, etc., can solve the problems of poor reduction effect of refractory pollutants, low rate of refractory industrial wastewater, limited application, etc. The effect of high activity, convenient dosing and fast reaction rate

Active Publication Date: 2012-08-01
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the rate of pretreatment of refractory industrial wastewater by FHC reduction is not very high, and the reduction effect on refractory pollutants with complex structures is not good, which limits its application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Preparation of FHC: Weigh 27.8g of FeSO 4 ·7H 2 O was dissolved in 200ml of distilled water without dissolved oxygen, and 0.1g of sodium tripolyphosphate was added as a dispersant, and then 25ml of 5mol / L anaerobic sodium hydroxide aqueous solution was added dropwise, Fe(II) and OH - The molar ratio is 0.8, and it is stirred while adding dropwise until a dark green FHC suspension system is formed.

[0016] Preparation of Ag / FHC: According to the preparation method of FHC, first prepare the FHC system, then add 1 mL of 0.1 mol / L silver nitrate solution to the FHC system so that the molar ratio of Ag to Fe is 0.1%, and stir for 0.2 h. Adding 1ml of 1mol / L oxygen-free sodium borohydride solution to the Ag / FHC system as a protective agent is beneficial to the formation and stability of Ag / FHC and plays a role in strengthening the reduction.

[0017] Reduction of hexachloroethane in wastewater: take the prepared FHC and Ag / FHC suspension and directly add them to two reacto...

Embodiment 2

[0019] Preparation of FHC: Weigh 27.8g of FeSO 4 ·7H 2 O was dissolved in 100ml of distilled water without dissolved oxygen, and 0.01g of sodium tripolyphosphate was added as a dispersant, and then 40ml of 5mol / L anaerobic sodium hydroxide aqueous solution was added dropwise, Fe(II) and OH - The molar ratio is 0.5, and it is stirred while adding dropwise until a dark green FHC suspension system is formed.

[0020] Preparation of Ag / FHC: According to the preparation method of FHC, first prepare the FHC system, then add 5 mL of 0.1 mol / L silver nitrate solution to the FHC system so that the molar ratio of Ag to Fe is 0.5%, and stir for 0.5 h. Adding 10ml of 1mol / L oxygen-free sodium borohydride solution to the Ag / FHC system as a protective agent is beneficial to the formation and stability of Ag / FHC and plays a role in strengthening the reduction.

[0021] Reduction of cationic red X-GRL dye wastewater: Take the prepared FHC and Ag / FHC suspensions and directly add them to two ...

Embodiment 3

[0026] Preparation of FHC: Weigh 13.9g of FeSO 4 ·7H 2 O was dissolved in 100ml of distilled water without dissolved oxygen, and 0.02g of sodium tripolyphosphate was added as a dispersant, and then 20ml of 4mol / L oxygen-free potassium hydroxide aqueous solution was added dropwise, Fe(II) and OH - The molar ratio was 0.625, and it was added dropwise while stirring until a dark green FHC suspension system was formed.

[0027] Preparation of Ag / FHC: According to the preparation method of FHC, first prepare the FHC system, then add 2 mL of 0.1 mol / L silver nitrate solution to the FHC system, so that the molar ratio of Ag to Fe is 0.4%, and stir for 0.1 h. Adding 2ml of 1mol / L oxygen-free sodium borohydride solution to the Ag / FHC system as a protective agent is beneficial to the formation and stability of Ag / FHC and plays a role in strengthening the reduction.

[0028]Reduction of dibromoaniline in wastewater: Take the prepared FHC and Ag / FHC suspension and add them directly to t...

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Abstract

The invention belongs to the technical field of environmental engineering, and particularly relates to a preparation method and application of a polyhydroxy ferrous complex reduction system. The preparation method comprises the following steps: dropwisely adding an alkaline matter into an oxygen-free ferrite aqueous solution, stirring to react, and combining ferrous ions with all hydroxyl ions byregulating different ferrous ion / hydroxyl ion mol ratios and the type and content of anions, thereby forming a polyhydroxy ferrous complex (FHC); and adding a silver nitrate solution, a dispersant and a protective agent to form an Ag / FHC reduction system, thereby greatly enhancing the reducibility of the FHC. The Ag / FHC reduction system has the advantages of high reduction activity and high reaction rate, is convenient to add, and can be used for treating wastewater containing multiple nondegradable pollutants.

Description

technical field [0001] The invention belongs to the technical field of environmental protection engineering, and specifically relates to a reduction system of polyhydroxy ferrous complex (FHC) and its preparation method and application. Background technique [0002] In recent years, my country's chemical industry has developed rapidly, and the discharge of chemical wastewater has also increased year by year. Most of the wastewater discharged from chemical industries such as petroleum, papermaking, printing and dyeing, and coking is refractory industrial wastewater. These chemical wastewater BOD 5 / COD is very low, and it has typical difficult-to-treat characteristics such as high concentration, high salinity, high chroma, and high toxicity. It is highly toxic to microorganisms and difficult to biodegrade. For this kind of wastewater, the current treatment technology is to combine pretreatment technology with biological treatment technology, that is, pretreatment is carried ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/70
Inventor 吴德礼王权民冯勇马鲁铭
Owner TONGJI UNIV
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