文献类型：期刊文献

英文题名：The study of MnO2 with different crystalline structures for U(VI) elimination from aqueous solution

作者：Liu, Yuxin[1];Deng, Hao[1];Lu, Zhipeng[1];Zhong, Xin[1];Zhu, Yulin[1]

机构：[1]Shaoxing Univ, Sch Life Sci, Huancheng West Rd 508, Shaoxing 312000, Peoples R China

年份：2021

卷号：335

外文期刊名：JOURNAL OF MOLECULAR LIQUIDS

收录：SCI-EXPANDED(收录号：WOS:000662831600103)、、WOS

基金：Financial support from the Research Fund Program of National Natural Science Foundation of China (No.22076124), and Scientific Research Start-up Fund of Shaoxing University (20195007).

语种：英文

外文关键词：alpha-MnO2; beta-MnO2; gamma-MnO2; delta-MnO2; U(VI); Adsorption

外文摘要：The adsorption remediation of radioactive contamination from wastewater was of great scientific and economic significance. In this paper, we synthesized alpha-MnO2, beta-MnO2, gamma-MnO2 and delta-MnO2 with different crystalline structures via hydrothermal method, and investigated their adsorption performance towards U(VI). SEM, FT-IR XRD, BET and XPS were adopted to determine the surface properties and pore structures. The pseudo-second-order model and the Langmuir model were better suited for the adsorption process. The maximum adsorption capacities (pH 6, 298 K) were in order of delta-MnO2 (304.92 mg/g) > alpha-MnO2 (289.42 mg/g) > gamma-MnO2 (277.09 mg/g) > beta-MnO2 (257.84 mg/g), owing to the different specific surface area and crystallinity. delta-MnO2 possessed layered structure, poor crystallinity, as well as the largest surface area and pore volume, which were conducive to the diffusion of U(VI) ions between layers, and the effective use of the adsorption sites, thus promoting the adsorption capacity of U(VI) ions. Besides, the adsorption mechanism of MnO2 towards U(VI) was principally attributable to electrostatic attraction and the surface complexation ((Mn-O-U(VI))) due to various oxygen-containing functional groups. Consequently, the low-priced, simple preparation and highly efficient endowed delta-MnO2 with wide application for U(VI) removal from wastewater. (C) 2021 Elsevier B.V. All rights reserved.