New materials quickly “remove” soil heavy metal pollution

A new type of magnetic solid chelating agent technology that can remove heavy metal pollution in soil. It was jointly developed by China University of Geosciences (Wuhan) and the Institute of Agricultural Environment and Sustainable Development of the Chinese Academy of Agricultural Sciences. It has recently passed science and technology in Beijing. Evaluation of results.

Xu Yingming, a researcher at the Environmental Protection Research Institute of the Ministry of Agriculture, said that the material has the dual functions of solid phase sequestration and magnetic separation, and has a separation and purification effect on various forms of non-magnetic heavy metal elements in the soil. The material structure is original and has independent intellectual property rights; in the same kind of research, the technology has reached the international advanced level.

Song Jiqing, a researcher at the Institute of Agricultural Environment of the Chinese Academy of Agricultural Sciences, said that the technology relies on the principle of adsorption of inorganic-organic hybrid composite water-retaining agent in the “12th Five-Year Plan” National 863 Program. The new material purification and repair process has less soil chemical disturbance and is repaired in farmland soil. It has a big advantage.

Fan Liren, a professor at China University of Geosciences (Wuhan), said that magnetic solid chelating agent particles can “target chelate passivation” harmful heavy metals in the soil, reduce the absorption of crops, and can quickly load the magnetic field during fallow farming. The magnetic material of the heavy metal is separated from the soil, so that the heavy metal of the soil is “removed and reduced” to directly eliminate the hidden danger of heavy metals being reactivated by soil organisms or other reasons. The material can be recycled and reused. The cost of tons of soil treatment materials can be as low as 2-10 yuan per element.

According to the Wuhan Mineral Resources Supervision and Inspection Center of the Ministry of Land and Resources, the removal rates of cadmium and lead in the soil samples were 77% and 73.6%, respectively. Surface soil purification tests near the Zhuzhou lead-zinc smelter in Hunan showed that the removal rate of cadmium and lead was about 75%, and the removal rate of zinc was about 50%. The content of lead and cadmium decreased from 40.15 mg/kg to 1.28 mg/kg, which was close to the natural background value of the soil and the national secondary standard. The removal effect was significant; and it was evaluated by users as “satisfactory soil pollution. effect".

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