High magnetic modified biochar, preparation method of high magnetic modified biochar, and application to treatment of heavy metal pollution to soil

Abstract

The invention belongs to the technical field of restoration and treatment of heavy metals in soil, and discloses a high magnetic modified biochar, a preparation method of the high magnetic modified biochar, and an application to treatment of the heavy metal pollution to the soil. The preparation method comprises the following steps: grinding and sieving the biochar, adding the biochar into a NaOHsolution, stirring, filtering, and washing with water; adding a filter residue into an HCl solution, continuing to stir, filtering, washing with water to obtain a basic charcoal material, and drying for later use; adding the basic charcoal material into an FeCl2-7H2O aqueous solution, regulating the pH value, adding a sodium borohydride solution until no bubble is generated, then adding a saturated sodium dimethyl dithio carbamate aqueous solution, continuing to stir, collecting a residue in the solution through a magnetic field, and washing and drying to obtain the high magnetic modified biochar. The specific surface area of the modified biochar is increased, the passivating efficiency of the heavy metals in the soil is improved, the magnetic property of the high magnetic modified biocharis strong, the high magnetic modified biochar is removed from the soil through a magnet, and the total content of the heavy metals in the soil is reduced.

Description

technical field [0001] The invention belongs to the technical field of soil heavy metal restoration and treatment, and in particular relates to a highly magnetically modified biochar, a preparation method thereof, and an application in the treatment of soil heavy metal pollution. Background technique [0002] The remediation of heavy metal pollution in soil mainly has the following two approaches: one is to change the form of heavy metals in the soil to reduce their mobility, bioavailability and environmental risks in the soil, that is, to stabilize heavy metals; the other is to stabilize heavy metals. Remove from the soil to make the soil heavy metal content close to or reach the soil background value. The stabilization technology has attracted extensive attention for its advantages of short treatment time, low cost, wide application range, and small impact on the ecological environment. The passivating fixatives commonly used at present include inorganic passivating agent...

AI Technical Summary

Problems solved by technology

[0004] Existing soil heavy metal passivators are generally added in a large amount and are expensive, so it is difficult to apply them in practice

At the same time, some researchers also use organic polymers as soil heavy metal passivators for soil remediation, but this passivator has the risk of decomposition, and heavy metals may be released again, causing harm to the soil environment

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