期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 303, 期 1, 页码 9-17出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2006.07.011
关键词
calcium oxide; phosphated calcium oxide; phosphonated calcium oxide; X-ray diffractometry; ex situ FTIR spectroscopy; scanning electron microscopy; energy dispersive X-ray emission; in situ FTIR of adsorbed probe molecules; CO adsorption; CO2 adsorption; CDCl3 adsorption; methylbutynol decomposition; surface acid-base properties; particle morphology
Pure, phosphated, and phosphonated CaO samples were prepared and characterized by X-ray powder diffractometry, FTIR spectroscopy, scanning electron microscopy, and energy-dispersive X-ray microprobing. Surface acid-base properties were probed by in situ FTIR spectroscopy of adsorbed CO (at 85 K), CDCl3 (at RT), CO2 (at RT), and methyl butynol decomposition reactions (at 473 K). Results obtained have shown phosphate and, to a larger extent, phosphonate additives to enhance the strength of Lewis acid sites exposed on CaO surfaces, at the expense of the Lewis base site strength. The phosphonation has been found, moreover, to make CaO particles grow in a preferential direction and be less susceptible to rehydration. These findings may establish surface chemical attributes for the application of the methylene bisphosphonate (MBP) class of drugs to hamper acid-induced resorption of bone materials (osteoporosis). (c) 2006 Elsevier Inc. All rights reserved.
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