Dithiocarbamate functionalized dendrimer with alkylenediamine core as soil heavy metal immobilization amendment and preparation method thereof

摘要

A dithiocarbamate functionalized dendrimer with an alkylenediamine core, a dithiocarbamate pendant functional group and a dithiocarbamate end functional group, as a soil heavy metal immobilization amendment, and a preparation method thereof are provided. The dithiocarbamate functionalized dendrimer has a chemical formula of (CH₂)_a{N[CH₂CH₂COOCH₂C(C₂H₅)(CH₂OCOCH₂CH₂N(CSSM)CH₂(CH₂)_bCH₂N(CSS M)₂)₂]₂}₂, wherein a is a positive integer larger than 2; b is a positive integer at a range of 0-4; and M is Na⁺, NH₄⁺ or K⁺. The dithiocarbamate functionalized dendrimer with the alkylenediamine core is used for an in-suit immobilization remediation for soil contaminated by heavy metals, and has advantages of a small dosage, high efficiency, safety and rapidness. The dendrimer is able to effectively immobilize exchangeable and carbonated bound forms of the heavy metals, in such a manner that the immobilized heavy metals are able to resist an influence from natural environment for a long term, such as an acid rain.