Novel method for preparing load nano zero valent iron

A nano-zero-valent iron, loaded technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of high reagent cost, unstable particle size and composition, and non-renewable

Inactive Publication Date: 2011-10-05
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its advantage is that the experimental operation is simple and the feasibility is strong. The disadvantage is that the cost of the reagent is high, which is 150-250 yuan/kg in industry, a

Method used

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  • Novel method for preparing load nano zero valent iron
  • Novel method for preparing load nano zero valent iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Prepare or purchase a mixed system in which iron oleate is dispersed in a non-polar solvent, a mixed system in which iron hydroxide is dispersed in a non-polar solvent, or FeCl 3 Aqueous solution, take 5ml of a solution of one of the above systems, vacuum filter it and load it on 1.000g of carbon black. Collect the residue on the filter paper, weigh it immediately and let it stand overnight, then treat it in an oven at 60°C for 24h.

Embodiment 2

[0025] Take 0.200 g of the iron oleate-carbon black load and place it in the heating zone of the tubular atmosphere furnace. Introduce N into the furnace first 2 , N 2 The flow rate was controlled at 200ml / min for 20min. stop access N 2 After that, H was introduced into the furnace 2 , H 2 The flow rate was controlled at 100ml / min for 20min. close H 2 Open the gas cylinder and turn on the electric furnace, heat up to 1100°C, the cumulative heating time is 3h, and intermittently feed H at a rate of 100ml / min per hour. 2 , ventilation for 5 minutes. For the characterization of the obtained load, see figure 1 (XRD pattern of iron oleate-carbon black load after hydrogen treatment) and figure 2 (XRD peak shape matching diagram of iron oleate-carbon black load and 01-087-0722 type α-Fe).

Embodiment 3

[0027] Take 0.200 g of ferric oleate-activated carbon load and place it in the heating zone of the tubular atmosphere furnace. Introduce N into the furnace first 2 , N 2 The flow rate was controlled at 500ml / min for 20 minutes. stop access N 2 After that, H was introduced into the furnace 2 , H 2 The flow rate was controlled at 100ml / min for 20min. close H 2 Open the gas cylinder and turn on the electric furnace, heat up to 800°C, the cumulative heating time is 10h, and intermittently feed H at a rate of 100ml / min per hour. 2 , ventilation for 5 minutes.

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Abstract

The invention discloses a novel method for preparing load nano zero valent iron. The iron source is iron-containing compounds of Fe<2+> and Fe<3+>, such as ferric oleate, ferric hydroxide oxide, ferric chloride, ferric nitrate and the like; and the loads are carbon black, active carbon, kieselguhr, zeolite and other load materials. The method is characterized in that: the iron-containing compounds on the loads are reduced into nano zero valent iron under the atmosphere condition and under the reduction action of reducing agents, such as H2, CO, and reduction carbon (such as coke, reduction coal and the like). The preparation method is environment-friendly, and simple and is low in cost; the expensive reducing agents (such as NaBH4 and the like) are avoided, and organic pollutants (such as halogenated hydrocarbon, pesticide, polychlorinated biphenyls (PCBs) and polycyclic aromatic hydrocarbons (PAHs), inorganic negative ions (such as NO<3->), and heavy metal (such as Cr<6+>, As<3+>, As<5+>, Cu<2+>, Pb<2+>) and the like can be efficiently removed effectively.

Description

technical field [0001] The invention relates to a preparation method of a novel loaded nanometer zero-valent iron. Background technique [0002] Nano-zero-valent iron (nZVI) technology is a water body remediation technology developed in the past ten years. It is a new generation of nanotechnology applied in the environmental field, and has broad application prospects in the field of surface water and groundwater pollution remediation. [0003] The particle size of nano zero-valent iron is generally controlled at 20-100nm, and has a double-layer structure. The inner layer of elemental iron is surrounded by the outer layer of iron oxide, and the thickness of the outer shell is about 10-20nm (Ramos, 2009). The high specific surface area, high permeability, and high reactivity of nano-zero-valent iron can efficiently remove organic pollutants (such as halogenated hydrocarbons, pesticides, PCBs, PAHs), and inorganic anions (such as NO 3 - ), heavy metals (such as Cr 6+ 、As 3+...

Claims

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Application Information

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IPC IPC(8): B22F9/22B82Y40/00B82Y30/00
Inventor 郭学军刘虹赵雄业钱清清
Owner BEIJING NORMAL UNIVERSITY
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