Preparation and adsorption performance of a NiO/MgF2 composite adsorbent
Preparation and adsorption performance of a NiO/MgF2 composite adsorbent
复制标题
NiO/MgF2复合吸附剂的制备及吸附性能
DOI：
10.1007/s10967-018-5897-y
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发表时间：
2018
影响因子：
1.6
通讯作者：
Li Qingnuan
中科院分区：
文献类型：
--
作者：
Li Sasa;Cheng ZhiQiang;Zhang Linjuan;Han Han;Dai Jianxing;Li Yangjuan;Dou Qiang;Li Qingnuan
氟吸附剂应用于氟化过程中UF6产品的提纯。以NiF2为掺杂剂，制备了基于MgF2的吸附剂NiO/MgF2。NiO/MgF2的比表面积是MgF2的5倍，孔隙率也比MgF2大。NiO/MgF2对MoF6的饱和吸附量为21.4±1.9 mg g−1。用热重分析（TG）考察了其解吸行为。利用扩展x射线吸收精细结构光谱（EXAFS）研究了NiO/MgF2对MoF6的吸附，结果表明NiO与MoF6之间没有键合作用，而MoF6在NiO/MgF2上的吸附是通过Mo-F-Mg键进行化学吸附的。
Fluoride adsorbents have been applied for the purification of UF6 product from fluorination process. A MgF2-based adsorbent, NiO/MgF2, was prepared using NiF2 as doping agent. The specific surface area of NiO/MgF2 was 5 times larger than that of MgF2, its porosity was also larger than that of MgF2. The saturated adsorption capacity of NiO/MgF2 for MoF6 was 21.4 ± 1.9 mg g−1. The desorption behavior was examined by thermogravimetric analysis (TG). The NiO/MgF2 with adsorbed MoF6 was investigated using extended X-ray absorption fine structure spectroscopy (EXAFS), which showed no bonding interactions between NiO and MoF6, while the adsorption of MoF6 on NiO/MgF2 was chemisorption via a Mo–F–Mg bond.