文献类型：期刊文献

英文题名：The fabrication of 3D hierarchical flower-like delta-MnO2@COF nanocomposites for the efficient and ultra-fast removal of UO22+ ions from aqueous solution

作者：Zhong, Xin[1];Lu, Zhipeng[1];Liang, Wen[1];Guo, Xiaojie[2];Hu, Baowei[1]

机构：[1]Shaoxing Univ, Sch Life Sci, Huancheng West Rd 508, Shaoxing 312000, Peoples R China;[2]Hangzhou Dianzi Univ, Coll Mat & Environm Engn, Hangzhou 310018, Peoples R China

年份：2020

卷号：7

期号：11

起止页码：3303

外文期刊名：ENVIRONMENTAL SCIENCE-NANO

收录：SCI-EXPANDED(收录号：WOS:000590786100026)、、WOS

基金：Financial support from the Research Fund Program of the National Natural Science Foundation of China (No. 21876115), the Key Research Program of Shaoxing University (2019LG1003), and Scientific Research Start-up Fund of Shaoxing University (20195007) is acknowledged.

语种：英文

外文摘要：Herein, interpenetrating 3D flower-like delta-MnO2@TpPa-1 composites were suitably constructed though the integration of delta-crystal manganese dioxide (delta-MnO2) nano-flowers with a covalent organic framework (COF, TpPa-1) via adopting a simple ultrasonication process. The physicochemical properties of delta-MnO2@TpPa-1 were characterized via SEM, TEM-EDX, XRD, FT-IR, pH(pzc), XPS, and N-2 adsorptiondesorption studies. The kinetics of UO22+-ion adsorption onto delta-MnO2 and delta-MnO2@TpPa-1 confirmed the existence of a pseudo-second-order model. The results of isothermal experiments showed that the Langmuir model provided a better fit, illustrating a spontaneous, endothermic, and monolayer chemisorption process for UO22+ ions onto delta-MnO2 and delta-MnO2@TpPa-1. The maximum adsorption levels of UO22+ ions onto delta-MnO2 and delta-MnO2@TpPa-1 were 499.41 mg g-1 and 1147.773 mg g(-1), respectively, at pH 6.5 and 298 K, owing to electrostatic attraction and inner-sphere surface complexation. Oxygencontaining groups played essential roles in the formation of U-O bonds and covalent Mn-O-U bonds, making delta-MnO2@TpPa-1 an excellent adsorbent for radionuclide elimination from solution.