零价铁
吸附
水溶液
X射线光电子能谱
木屑
环境修复
化学
共沉淀
核化学
吸附
傅里叶变换红外光谱
化学工程
材料科学
无机化学
污染
有机化学
生物
工程类
生态学
作者
Haibo Liu,Mengxue Li,Tianhu Chen,Changlun Chen,Njud S. Alharbi,Tasawar Hayat,Dong Chen,Qiang Zhang,Yubing Sun
标识
DOI:10.1021/acs.est.7b02431
摘要
New nanoscale zerovalent iron/carbon (nZVI/C) composites were successfully prepared via heating natural hematite and pine sawdust at 800 °C under nitrogen conditions. Characterization by SEM, XRD, FTIR, and XPS analyses indicated that the as-prepared nZVI/C composites contained a large number of reactive sites. The lack of influence of the ionic strength revealed inner-sphere complexation dominated U(VI) uptake by the nZVI/C composites. Simultaneous adsorption and reduction were involved in the uptake process of U(VI) according to the results of XPS and XANES analyses. The presence of U-C/U-U shells demonstrated that innersphere complexation and surface coprecipitation dominated the U(VI) uptake at low and high pH conditions, respectively. The uptake behaviors of U(VI) by the nZVI/C composites were fitted well by surface complexation modeling with two weak and two strong sites. The maximum uptake capacity of U(VI) by the nZVI/C composites was 186.92 mg/g at pH 4.0 and 328 K. Additionally, the nZVI/C composites presented good recyclability and recoverability for U(VI) uptake in regeneration experiments. These observations indicated that the nZVI/C composites can be considered as potential adsorbents to remove radionuclides for environmental remediation.
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