Novel method for preparing load nano zero valent iron

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+...

AI Technical Summary

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, and the price of nZVI in business is about 50 US dollars / kg.

Harvested zero-valent iron has a wide size distribution, is unstable in particle size and composition, and cannot be regenerated

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