Chemical Engineering Division, Atomic Research Centre, Trombay, Mumbai, 400085, India.
Process Development Division, Atomic Research Centre, Trombay, Mumbai, 400085, India.
J Hazard Mater. 2018 Mar 5;345:63-75. doi: 10.1016/j.jhazmat.2017.11.003. Epub 2017 Nov 2.
The manuscript presents the results on the sorption of U(VI), Am(III) & Eu(III) from pH medium by a novel amido-amine functionalized multiwalled carbon nanotube (MWCNT). The novel functional group was introduced in the MWCNT by two step processes and characterized by various instrumental techniques like Scanning Electron Microscopy (SEM), Raman and X-ray Photoelectron Spectroscopy (XPS). The sorption process was found to be highly dependent on the pH of the solution with maximum sorption for both 233U, 241Am & 152+154Eu at pH 7.0. Kinetics of sorption was found to be fast with equilibrium reached in ∼15min and the sorption was found to be following pseudo 2nd order kinetics for the radionuclides. The sorption for both 233U and 152+154Eu followed Langmuir sorption model with maximum sorption capacity of 20.66mg/g and 16.1mg/g respectively. This has been explained by DFT calculations which shows that more negative solvation energy of U(VI) compared to Am(III) and Eu(III) and stronger U-MWCNT-AA complex is responsible for higher sorption capacity of U(VI) compared to Am(III) and Eu(III).The synthesized amido-amine functionalized MWCNT is a very promising candidate for removal of actinides and lanthanides from waste water solution with high efficiency.
本文介绍了一种新型酰胺-胺功能化多壁碳纳米管（MWCNT）在 pH 介质中对 U(VI)、Am(III) 和 Eu(III)的吸附研究结果。新型官能团通过两步法引入 MWCNT，并通过各种仪器技术进行了表征，如扫描电子显微镜（SEM）、拉曼和 X 射线光电子能谱（XPS）。吸附过程高度依赖于溶液的 pH 值，在 pH 值为 7.0 时，对 233U、241Am 和 152+154Eu 的吸附达到最大值。吸附动力学表明，吸附过程非常迅速，在约 15 分钟内达到平衡，并且对于放射性核素，吸附遵循拟二级动力学。233U 和 152+154Eu 的吸附均遵循 Langmuir 吸附模型，最大吸附容量分别为 20.66mg/g 和 16.1mg/g。这可以通过 DFT 计算来解释，DFT 计算表明，与 Am(III)和 Eu(III)相比，U(VI)的溶剂化能更负，U-MWCNT-AA 络合物更强，这是 U(VI)比 Am(III)和 Eu(III)具有更高吸附容量的原因。合成的酰胺-胺功能化 MWCNT 是一种很有前途的候选材料，可用于高效去除废水中的锕系元素和镧系元素。
