Method for coupling and passivating nano zero-valent iron system by using reinforced iron reducing bacteria

Abstract

The invention relates to a method for coupling and passivating a nano zero-valent iron system by using reinforced iron reducing bacteria. The method specifically comprises the following steps: step 1,completing preparation of graphene oxide loaded nano zero-valent iron, to be more specific, preparing graphene oxide by adopting a Hummers method, adding 200mg of the prepared graphene oxide into a 250mL three-neck flask, dissolving 0.496 g of ferrous sulfate heptahydrate into a mixed solution of 60mL of water and 20mL of ethanol, adding the mixed solution into the three-neck flask, and carryingout ultrasonic processing by an ultrasonic instrument at 50kHz for 30min; step 2, degrading 4-chlorophenol by using the graphene oxide loaded nano zero-valent iron; step 3, carrying out artificial culture on shewanella; and step 4, completing graphene oxide mediated reducing and passivating of the nanoscale zero-valent iron by the shewanella to degrade the 4-chlorophenol. According to the grapheneoxide loaded passivated nano zero-valent iron coupled shewanella, through the coupling effect of iron reducing bacteria shewanella and a material, a coupling system is enhanced by the graphene oxide,the formation of a passivation layer is reduced, the reaction activity of the system is improved, and the defect that nano zero-valent iron is easy to inactivate is overcome.

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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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

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