Method for alleviating nano zero-valent iron passivation

A nano-zero-valent iron and zero-valent iron technology, applied in the field of materials, can solve the problems of high energy consumption, complex operation, difficult to use on a large scale, and achieve the effects of low energy consumption, simple operation, alleviation and promotion of degradation

Inactive Publication Date: 2017-06-13
SUZHOU INST FOR ADVANCED STUDY USTC
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Problems solved by technology

[0004] The existing technology has the method of using electrochemical method or external magnetic field to eliminate the passivation layer on the surface of zero-valent iron, but ...

Method used

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  • Method for alleviating nano zero-valent iron passivation
  • Method for alleviating nano zero-valent iron passivation
  • Method for alleviating nano zero-valent iron passivation

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Embodiment

[0033] Embodiment A method for alleviating the passivation of nanometer zero valent iron

[0034] Step 1. Preparation of nanometer zero-valent iron and its use in reductive dechlorination of chlorinated organics

[0035] The nanometer zero-valent iron is prepared by a chemical precipitation method by adopting ferric salt and borohydride, and the obtained product is dried and preserved. Add 50 mg of nanometer zero-valent iron to an anaerobic vial containing 100 mL of carbon tetrachloride (35 μM), place it in a shaker, and carry out dechlorination reaction at 30 ° C and 180 rpm, and take samples at specific time points, and use Gas chromatograph detects carbon tetrachloride; Treat that carbon tetrachloride degrades completely, add 35 μ M carbon tetrachloride again and continue the degradation reaction of next cycle, run continuously for four cycles (see figure 1 ). figure 1 It shows that after several cycles of dechlorination reaction, the reactivity of nanometer zero-valent i...

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Abstract

The invention relates to the technical field of materials and discloses a method for alleviating nano zero-valent iron passivation. The method comprises the following steps: selecting at least one iron reduction microbe, culturing by selecting a proper culture medium, and ending culture while reaching the stable phase of the microbes; and adding the at least one iron reduction microbe screened in the step (1) into a reaction system of zero-valent iron reduced organic pollutants when the reduction activity of the nano zero-valent iron is less than or equal to 50% of the original activity. Compared with the existing method for alleviating zero-valent iron passivation, the method disclosed by the invention is environment-friendly, adopts ubiquitous iron reduction microbes in the environment and is simple in operation. In addition, the method disclosed by the invention is low in energy consumption, does not need extra energy and is capable of simultaneously achieving the effects of alleviating nano zero-valent iron passivation and promoting degradation of the pollutants.

Description

technical field [0001] The invention relates to the technical field of materials, and more specifically relates to a method for alleviating the passivation of nanometer zero-valent iron. Background technique [0002] Nano-sized zero-valent iron has the characteristics of small size and high surface activity, so it is widely used in many fields such as pollutant degradation and environmental restoration. The application range of nano zero-valent iron for pollutant removal mainly includes heavy metal removal, such as chromium Cr, cadmium Cd, mercury Hg, nickel Ni, etc.; organic pollutant degradation, such as organic chlorinated compounds, including carbon tetrachloride, trichloride, etc. Ethylene, polychlorinated biphenyls, etc.; and the removal of nutrients in water bodies, such as nitrates, phosphates, etc. [0003] However, there is a general passivation problem in the application process of nano-zero-valent iron. The common passivation phenomenon is that after the reacti...

Claims

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Application Information

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IPC IPC(8): C02F1/70B22F1/00
CPCC02F1/705C02F2101/36B22F1/07B22F1/054B22F1/145
Inventor 李文卫霍颖超柳后起曾建雄
Owner SUZHOU INST FOR ADVANCED STUDY USTC
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