Iron-carbon composite material as well as preparation method and application thereof

Abstract

The invention discloses an iron-carbon composite material and a preparation method and application thereof. The iron-carbon composite material has a three-layer core-shell structure, and the three-layer core-shell structure sequentially comprises a porous graphite carbon outer layer, an iron carbide middle layer and a nanoscale zero-valent iron inner core from outside to inside. The nano zero-valent iron is coated in the porous graphite carbon and the iron carbide so that the nano zero-valent iron can be prevented from being oxidized, the existence of the iron carbide effectively improves the arsenic fixing capability, the efficient and long-term utilization of the nano zero-valent iron is realized, very strong adsorption and fixing capability on the arsenic is achieved, and particularly, As (III) can be efficiently oxidized and converted into As (V) with relatively low toxicity.

Description

technical field [0001] The invention relates to the technical field of environmental restoration, in particular to an iron-carbon composite material and a preparation method and application thereof. Background technique [0002] Arsenic (As) is a highly toxic carcinogenic metalloid. Mining, non-ferrous metal smelting and pesticide use are the main sources of arsenic pollution, and with the development of society, environmental water and soil heavy metal pollution is becoming more and more serious. Studies have shown that rice consumption is the main route of intake of inorganic arsenic, which constitutes the first class of carcinogens. It is estimated that rice contributes about 60% of the total dietary intake of inorganic arsenic. Inorganic arsenic in water and soil mainly exists as As(III) and As(V), while As(III) is more toxic and mobile, and it is easier to be absorbed by rice and accumulate in rice, threatening environment and human health. Therefore, how to remedia...

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Problems solved by technology

However, zero-valent iron itself has problems such as difficult storage and use, poor long-term effect, and high preparation cost, which limit its large-scale application in the restoration of heavy metals such as arsenic in actual farmland soil.

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