Porous nano silicon dioxide loaded alkyl dithiocarbamate soil heavy metal passivator as well as preparation method and application thereof

The preparation method comprises the following steps: taking a silicate aqueous solution as a substrate, adding a strong alkali solution under a stirring condition, then adding an organic amine solution, finally adding a carbon disulfide solution, reacting, and drying to obtain the nano silicon dioxide loaded alkyl dithiocarbamate soil heavy metal passivation material. The nano silicon dioxide loaded alkyl dithiocarbamate can be used as a passivator for heavy metal contaminated soil, so that the dissolution of heavy metals is reduced, and the mobility of the heavy metals is reduced; meanwhile, nutrient elements such as K, Ca, Mg, N, Si and the like necessary for plants and microorganisms can be released, and the soil environment is improved. The remediation agent disclosed by the invention can be used for treating heavy metal contaminated soil, has relatively high passivation efficiency on heavy metal pollutants such as Pb, Cd and Cu, and has a relatively good application prospect. 本发明涉及一种纳米二氧化硅负载烷基二硫代氨基甲酸盐土壤