School of Environment, South China Normal University, Guangzhou Higher Education Mega Center, Guangzhou, 510006, People's Republic of China.
South China Institute of Environmental Sciences, Guangzhou, 510655, People's Republic of China.
Environ Sci Pollut Res Int. 2023 Jun;30(26):68191-68205. doi: 10.1007/s11356-023-27188-7. Epub 2023 Apr 29.
In response to Cd, Pb, and Cu pollution in acid mine drainage (AMD), a multigroup cellulose material (TCIS) containing thiol (-SH), carboxyl (-COOH), and imine (-C = N) groups was prepared through oxidation and grafting reactions. At pH 5, the maximum Cd(II), Pb(II), and Cu(II) adsorption performances of TCIS were 53.60, 120.6, and 36.01 mg/g, respectively. In the binary system, the interaction between metal ions was mainly inhibited by competitive adsorption. Cu(II) exhibited the most fierce inhibitory effect and had a relatively stable adsorption performance. In the ternary system, the adsorption order was Cu(II) > Cd(II) > Pb(II). In density functional theory (DFT) calculations, we combined the molecular electrostatic potentials, binding energies, differential charges, and total potentials to illustrate the competitive behavior of metal ions at different binding sites. Moreover, X-ray photoelectron spectroscopy (XPS) and DFT analysis revealed that the adsorption process of TCIS was dominated by the above functional groups, which caused competitive adsorption among Cd(II), Pb(II), and Cu(II).
针对酸性矿山排水（AMD）中的 Cd、Pb 和 Cu 污染，通过氧化和接枝反应制备了一种含有巯基（-SH）、羧基（-COOH）和亚胺（-C = N）基团的多组纤维素材料（TCIS）。在 pH 5 时，TCIS 对 Cd(II)、Pb(II) 和 Cu(II)的最大吸附性能分别为 53.60、120.6 和 36.01 mg/g。在二元体系中，金属离子之间的相互作用主要受到竞争吸附的抑制。Cu(II)表现出最强烈的抑制作用，且具有相对稳定的吸附性能。在三元体系中，吸附顺序为 Cu(II) > Cd(II) > Pb(II)。在密度泛函理论（DFT）计算中，我们结合分子静电势、结合能、差分电荷和总势能来解释不同结合位点上金属离子的竞争行为。此外，X 射线光电子能谱（XPS）和 DFT 分析表明，TCIS 的吸附过程主要由上述官能团主导，导致 Cd(II)、Pb(II)和 Cu(II)之间发生竞争吸附。
