纳米碳粒子的表面功能化

Surface functionalization of nanometer carbon beads and the use for nanometer complexant

以纳米碳粒子为原料,用化学表面修饰技术使纳米碳粒子表面功能化,将乙二氨基、氨荒酸基、硫脲基、脒基等官能团以共价键方式偶联在纳米碳粒的表面,制备出不同类型的纳米高分子络合吸附剂。吸附剂的粒径为4～8 nm,功能团在纳米碳粒子的表面含量为1.1 mmol/g。纳米高分子络合剂对过渡金属离子的吸附速率高、吸附量大并具有很高的选择性。

Ethylenediamine, dithiocarbamate thioureido and amidine ligand functionalized nanopar-ticles, with average diameters ranging from 4 to 8 nm and containing 1.1 mmol of ligand/g, were readily obtained by nanometer carbon beads modified with silane coupling agent, and then functionalized. By means of TG, FT1R, TEM and other analytical methods, the configuration of nanocomplexant was investigated. It is concluded that the complex groups are covalently linked with the carbon nanobeads. Its sorption characterstics for transition metal cations were studied. The nanometer complexant exhibits very high selectivity, capacity and rate of complexing. The surface functionalization of the nanoparti-cles is a useful technique to produce ultrafine ligand-functionalized nanoparticles with a high density of ligands.