文献类型：期刊文献

英文题名：Enhanced Hg0 removal via α-MnO2 anchored to MIL-96(Al)

作者：Zhou, Jiacheng[1,2];Cao, Limei[1,2];Wang, Qing[1,2];Tariq, Muhammad[1,2];Xue, Yijun[1,2];Zhou, Zhenhua[1,2];Sun, Wei[1,2];Yang, Ji[1,2]

机构：[1]East China Univ Sci & Technol, Sch Resources & Environm Engn, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China;[2]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China

年份：2019

卷号：483

起止页码：252

外文期刊名：APPLIED SURFACE SCIENCE

收录：;EI(收录号：20191406722582);WOS:【SCI-EXPANDED(收录号:WOS:000471105000030)】；

基金：This research is based on the work supported by the National Natural Science Foundation of China (51778229), and the "Shu Guang" project of the Shanghai Municipal Education Commission. We thank beamline BL14W1 (Shanghai Synchrotron Radiation Facility, Shanghai), and Catalysis and Surface Science Endstation (National Synchrotron Radiation Laboratory, Hefei) for providing the beam time.

语种：英文

外文关键词：MIL-96(Al); alpha-MnO2; Hg-0 removal

摘要：Metal-organic frameworks (MOFs) are porous materials with highly ordered structures, and find application in various fields such as gas transportation and catalysis. In the present study, Al-based MOFs (MIL-96(Al)) were chosen as supports for alpha-MnO2 because of their large specific surface area, excellent thermal stability, and environmental friendliness. Different loadings of alpha-MnO2 (5%, 10%, and 15%) were anchored to MIL-96(Al) via a one-step process of hydrothermal synthesis, and all the samples were characterized by XRD, ICP-AES, SEM, TEM, and XPS. The results show positive synergistic effects between the reactants and the support. Structurally, alpha-MnO2 is evenly dispersed on the surface of MIL-96(Al). Unlike common supports such as Al2O3 and SiO2, MIL-96(Al) is not static during the process of loading. The reactant KMnO4 modifies the surface of the support by destroying its organic ligands and forming erosion-induced holes, which help improve the dispersion of alpha-MnO2. In terms of mercury removal, MIL-96(Al) exposes more active sites of alpha-MnO2 by even dispersion of the latter, further enhancing the chemical adsorption and catalytic oxidation of alpha-MnO2. The mercury removal efficiency of the sample MM-15 is 1.55 times that of pure alpha-MnO2. XPS analysis was performed to determine the mechanism of Hg-0 removal by alpha-MnO2-MIL-96(Al), and the capture agent was determined to be a combination of chemical adsorbent and catalyst. The Hg-0 is oxidized to HgO by alpha-MnO2-MIL-96(Al), while Mn4+ is reduced to Mn3+, and alpha-MnO2 can also catalyze the reaction between O-2 and Hg-0. We believe that our research can introduce new avenues for effective understanding of the removal of heavy metals that threaten human health.