State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, College of Materials, Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu, 610059, China.
State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, College of Environment and Ecology, Chengdu University of Technology, Chengdu, 610059, China.
Environ Sci Pollut Res Int. 2020 Jan;27(3):2444-2454. doi: 10.1007/s11356-018-3536-3. Epub 2018 Oct 27.
In order to obtain a highly efficient solid-state heavy metal ion absorbing material, the crosslinked polyethylenimine dithiocarbamate was prepared via condensation of polyethyleneimine (PEI) with abundant amino groups and glutaraldehyde to form the crosslinked polymer, reduction of the resulting C=N double bonds to a much stable C-N single bonds, and then grafted with carbon disulfide. The material was evaluated in adsorbing cadmium (II), copper (II), and lead (II) ions. The adsorption behavior of cadmium, copper, and lead ions on the absorbent material was studied. Experiment results show that the adsorption rate is rapid for heavy metal ions, and the adsorption amount tends to constant after 40 min. Its absorption capabilities for cadmium (II), copper (II), and lead (II) ions reach up to 205.99, 215.02, and 451.79 mg/g, respectively. Furthermore, the absorbing material has good desorption and regeneration performance. The adsorption kinetics model well accords with the pseudo-second order kinetic equation. And the process of the adsorption is linear with the Langmuir adsorption model, and thus the adsorption process is monolayer adsorption.
为了获得高效的固态重金属离子吸收材料，通过缩聚多乙烯多胺（PEI）与丰富的氨基和戊二醛形成交联聚合物，将所得的 C=N 双键还原为更稳定的 C-N 单键，然后与二硫化碳接枝，制备了交联聚乙烯亚胺二硫代氨基甲酸盐。该材料用于吸附镉（II）、铜（II）和铅（II）离子。研究了吸附剂材料对镉、铜和铅离子的吸附行为。实验结果表明，重金属离子的吸附速率很快，40 分钟后吸附量趋于恒定。其对镉（II）、铜（II）和铅（II）离子的吸附能力分别高达 205.99、215.02 和 451.79mg/g。此外，该吸附材料具有良好的解吸和再生性能。吸附动力学模型很好地符合准二级动力学方程。吸附过程与朗缪尔吸附模型呈线性关系，因此吸附过程是单层吸附。
