Interpretation of interactions of halogenated hydrocarbons with modified silica adsorbent coated with 3-benzylketoimine group silane |
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Authors: | Rafa? Wawrzyniak Wies?aw Wasiak |
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Institution: | (1) College of Chemistry and Chemical Engineering, Neijiang Normal University, Neijiang, 641112, Sichuan, People’s Republic of China;(2) College of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 400044, People’s Republic of China; |
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Abstract: | The paper reports a new group of adsorbents obtained by modification of silica surface with silane containing 3-benzylketoimine
groups with bonded Cu(II) and Ni(II) chlorides. The adsorbents obtained were subjected to a chromatographic study to establish
the type of adsorbate-adsorbent interactions for aliphatic and aromatic halogenated hydrocarbons used as adsorbates. The following
retention parameters were determined: retention factor (k), Kovats retention index (I), specific retention volume (V
g), and molecular retention index (ΔM
e). Values of the molecular retention index were subjected to complex statistical analysis providing qualitative relations
between the adsorbates’ properties and spatial structure and their retention. It was observed that bonding of chlorides of
Cu(II) and Ni(II) with the ketoimine groups resulted in an increase of the retention index and the molecular retention index
indicating an increase of the adsorbate-adsorbent interaction in comparison with the reference column coated with silane including
a 3-benzylketoimine group without transition metal chlorides. Along with the observed increase of the adsorbate-adsorbent
interaction, larger difference between the retention indices was observed for both halogenated compounds. This indicates a
positive influence of the introduced transition metals on the selectivity of the adsorbate-adsorbent interactions of the examined
columns. |
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Keywords: | |
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