IRON-BASED BIOCHAR MATERIAL, PREPARATION PROCESS THEREFOR AND USE THEREOF IN SOIL POLLUTION TREATMENT

摘要

The present invention relates to the field of soil heavy metal repairing techniques, and specifically discloses a method for preparing an iron-based biochar material, an iron-based biochar material prepared therefrom, and a method for treating heavy metal pollutions in soil using the iron-based biochar material. The iron-based biochar material of the present invention is formed by a high temperature carbonization method with biomass as a raw material. In the process of preparing the biochar, an iron-containing compound is added with iron being doped in a particular proportion to form the iron-based biochar material having a special structure and function. The process for preparing the material is simple and convenient, has a lower production cost and a shorter production cycle; and the obtained iron-based biochar material has a unique effect on repairing arsenic cadmium composite polluted soils, can effectively reduce the bio-availability of arsenic and cadmium in soil, significantly reduce the content of arsenic and cadmium in agricultural products planted in arsenic cadmium composite polluted soils, has no toxicity and side effects on agricultural products, is safe to apply, and can be used for treating arsenic cadmium composite polluted soils in a large-scale.