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A method for strengthening iron-reducing bacteria coupling passivation nanometer zero-valent iron system

A nano-zero-valent iron system technology, applied in chemical instruments and methods, biological water/sewage treatment, transportation and packaging, etc., can solve the problems of easy oxidation and easy agglomeration of nano-zero-valent iron, so as to improve the reactivity, Wide distribution, the effect of reducing the formation of passivation layer

Active Publication Date: 2021-07-30
SHANGHAI UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that nano-zero-valent iron is easy to agglomerate and be easily oxidized, and to strengthen the technical method of coupling iron-reducing bacteria and passivated nano-zero-valent iron

Method used

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  • A method for strengthening iron-reducing bacteria coupling passivation nanometer zero-valent iron system
  • A method for strengthening iron-reducing bacteria coupling passivation nanometer zero-valent iron system
  • A method for strengthening iron-reducing bacteria coupling passivation nanometer zero-valent iron system

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Embodiment Construction

[0029] The technical solution of the present invention will be described in detail below in combination with specific embodiments.

[0030] This embodiment provides a method for strengthening iron-reducing bacteria coupled passivation nano-zero-valent iron system, which specifically includes:

[0031] Step 1. Complete the preparation of graphene oxide-supported nano zero-valent iron

[0032] Prepare graphene oxide by the Hummers method, add 200 mg of prepared graphene oxide into a 250 mL three-necked flask, then dissolve 0.496 g of ferrous sulfate heptahydrate in a mixed solution of 60 mL of water and 20 mL of ethanol, and add the mixed solution into the three-necked flask Ultrasound at 50kHz for 30 min on an ultrasound machine;

[0033] Under the stirring of a mechanical stirrer and the protection of nitrogen, a peristaltic pump was used to add 25 mL of sodium borohydride solution dropwise into a three-necked flask, and the reaction time was 30 min. After the reaction, cont...

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Abstract

The invention relates to a method for strengthening iron-reducing bacteria coupling passivation nano-zero-valent iron system, which specifically includes: step 1, completing the preparation of graphene oxide-loaded nano-zero-valent iron, wherein: adopting the Hummers method to prepare graphene oxide, in Add 200mg of prepared graphene oxide to a 250mL three-necked flask, then dissolve 0.496g of ferrous sulfate heptahydrate in a mixed solution of 60mL water and 20mL ethanol, add the mixed solution into the three-necked flask and ultrasonicate at 50kHz for 30min on an ultrasonic instrument ; Step 2, use graphene oxide to load nano-zero-valent iron to degrade 4-chlorophenol; Step 3, carry out artificial cultivation of Shewanella; Step 4, complete graphene oxide-mediated reduction passivation of nano-zero-valent Iron degrades 4-chlorophenol; the graphene oxide-supported passivated nano-zero-valent iron coupled Shewanella through the coupling of the iron-reducing bacteria Shewanella and the material, graphene oxide strengthens the coupling system and reduces the passivation layer The formation of the system improves the reactivity of the system, and overcomes the shortcoming that the nanometer zero-valent iron is easy to deactivate.

Description

technical field [0001] The invention relates to the technical field of material-coupling bacteria-enhanced reactivity, in particular to the preparation of graphene oxide-supported nano-zero-valent iron composite materials, and the method for graphene oxide-mediated strengthening of Shewanella coupling passivation nano-zero-valent iron system build. Background technique [0002] Since the 1980s, zero-valent iron has attracted widespread attention as an effective reducing agent for dehalogenation. In recent years, it has been found that nanometer zero-valent iron, as a specific form of zero-valent iron, has the characteristics of small particles and large specific surface area, and can perform reductive dehalogenation of various organic halides, including trichlorethylene (TCE), 4 - Chlorophenols, Pentachlorophenol (PCP), Tetrabromobisphenol A (TBBPA), Hexabromocyclododecane (HBCD), etc. [0003] However, due to the high surface activity of nano-zero-valent iron, it is easy ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00B22F9/24C02F3/34C02F101/36
CPCC02F3/34B22F9/24C02F2101/36B22F1/054
Inventor 李辉毛逸涛相明辉周猛司若凡
Owner SHANGHAI UNIV
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