Department of Civil Engineering, University of Louisiana at Lafayette, P. O. Box 43598, Lafayette, LA, 70504, USA.
Center for Environmental Technology, The Energy Institute of Louisiana, P. O. Box 43597, Lafayette, LA, 70504, USA.
Environ Sci Pollut Res Int. 2020 Jul;27(19):23616-23630. doi: 10.1007/s11356-020-08487-9. Epub 2020 Apr 15.
Functionalized ordered mesoporous carbon (MOMC-NP) was synthesized by chemical modification using HNO and HPO to enhance Pb(II) adsorption. The phosphate functional group represented by P-O-C bonding onto the surface of OMC was verified by FT-IR and XPS. Batch adsorption experiments revealed the improvement of adsorption capacity by 39 times over the virgin OMC. Moreover, the Pb(II) adsorption results provided excellent fits to Langmuir model and pseudo-second-order kinetic model. The adsorption mechanism of Pb(II) onto MOMC-NP revealed the formation of metal complexes with carboxyl, hydroxyl, and phosphate groups through ion exchange reactions and hydrogen bondings. The calculated activation energy was 22.09 kJ/mol, suggesting that Pb(II) adsorption was a chemisorption. At pH>pH, the main Pb(II) existing species of Pb(II) and Pb(OH) combine with the carboxyl, hydroxyl, and phosphate functional groups via electrostatic interactions and hydrogen bonding. All these findings demonstrated that MOMC-NP could be a useful and potential adsorbent for adsorptive removal of Pb(II). Graphical abstract.
采用 HNO 和 HPO 进行化学修饰合成了功能化有序介孔碳（MOMC-NP），以增强对 Pb(II)的吸附。FT-IR 和 XPS 验证了表面上代表 P-O-C 键的磷酸官能团。批吸附实验表明，与原始 OMC 相比，吸附容量提高了 39 倍。此外，Pb(II)吸附结果与 Langmuir 模型和拟二级动力学模型拟合良好。Pb(II)在 MOMC-NP 上的吸附机理表明，通过离子交换反应和氢键形成了与羧基、羟基和磷酸基团的金属配合物。计算出的活化能为 22.09 kJ/mol，表明 Pb(II)的吸附是化学吸附。在 pH>pH 时，Pb(II)的主要存在物种 Pb(II)和 Pb(OH)通过静电相互作用和氢键与羧基、羟基和磷酸官能团结合。所有这些发现表明，MOMC-NP 可能是一种有用且有潜力的吸附剂，可用于吸附去除 Pb(II)。
