Citation:
YAO Li-Feng, JIN Su-Rong, FENG Yu-Qi, DA Shi-Lu. Separation of Acidic Compounds on Dodecylamine-N,N-Dimethylenephosphonic Acid Modified Zirconia Stationary Phase[J]. Chinese Journal of Applied Chemistry,
;2005, 22(6): 605-609.
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A new zirconia-based stationary phase (DPZ) was prepared from zirconia modified with dodecyla-mine-N,N-dimethylenephosphonic acid (DDPA).The surface coverage of DDPA was 3.3 μmol/m2 when DPZ was modified under reflux,and only 0.64 μmol/m2 when DPZ was just impregnated in a DDPA solution (without refluxing).The results of color reaction of zirconia with ammonium molybdate indicate that,in both cases,DDPA adsorbed on zirconia via the combination of one phosphonic group with zirconia,and another phosphonic group was free.The mechanism was studied in detail based on the influence of methanol content and pH of mobile phase on the capacity factors of the acidic compounds.The free phosphonic groups shielded most of the Lewis-acid sites on the surface of zirconia and imparted negative charges on the surface at high pH,resulting in excellent resolution for phenols and a great improvement for the separation of benzoic acids.
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