Identification of F- species after adsorption at the surface of milled and unmilled γ-Al2O3
Identification of F- species after adsorption at the surface of milled and unmilled γ-Al2O3
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DOI：
10.1016/j.surfin.2017.12.002
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发表时间：
2018-03
影响因子：
6.2
通讯作者：
V. Scalise;G. Scholz;R. Bertram;E. Kemnitz
中科院分区：
文献类型：
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作者：
V. Scalise;G. Scholz;R. Bertram;E. Kemnitz
对高能球磨对γ-Al_2O_3结构和表面的功率进行了详细表征。除了比表面积和溶解行为的意外变化外，机械力化学处理还强烈地影响了氟在γ-Al_2O_3/水界面上的吸附。处理时间对这些过程具有相关的重要性。由于氟最初并不存在于γ-Al_2O_3的块体中，19F-MAS核磁共振研究允许在吸附实验后区分不同的F-物种在γ-Al_2O_3粉末的表面吸附或以金属氟化物颗粒的形式存在。
The power of a high energy ball milling process on the structure and at the surface of γ-Al2O3was characterized in detail. Beside unexpected changes of BET surface areas and of the dissolution behaviour, the mechanochemical treatment strongly influences the adsorption of fluorine at the γ-Al2O3/ water interface. The time of the treatment has relevant importance on these processes. Since fluorine is not originally present in the bulk of γ-Al2O3,19F MAS NMR studies allow to discriminate between different F-species adsorbed at the surface or present as metal fluoride particles in γ-Al2O3powders after adsorption experiments.