A study on Adsorption of Molecules by Ftnir and Calorimetry

1)羟基磷灰石表面结构及分子在羟基磷灰石上的吸附研究发现，在锶和钙羟基磷灰石上存在P-OH基团，并作为各种分子如H_2O、CO_2和有机分子的吸附位点。部分吸附的H_2O、CO_2和CH_3OH被化学吸附。2)贵金属氧化铁的制备与表征在多种螯合剂的作用下制备的氧化铁表现出对h2o的选择性吸附等特性。3)微孔赤铁矿的制备及其吸附性能研究发现，δ - feooh除气制备的赤铁矿（α - fe_2o_3）具有0.8 nm宽的狭缝状微孔。用红外光谱研究了赤铁矿表面铁- oh基团和微孔中吸附分子的状态。分子在狭缝微孔中的吸附取决于它们的偶极矩、分子大小和化学反应性。4)阶梯吸附等温线和表面非均质性在H_2O、CCl_4、C_6H_6和n-C_6H_<14>的吸附上发现了阶梯吸附等温线。这一结果是基于γ - feooh表面的化学和几何非均质性来解释的。5)单分散球形金属磷酸盐颗粒的制备与表征采用多种技术对单分散的磷酸钴和磷酸镍颗粒进行了表征。这些颗粒的层状结构导致了H_2O的选择性吸附。在100℃以上处理的颗粒具有中空结构。

1)Surface structure of and adsorption of molecules on hydroxylapatitesIt was found that the P-OH groups exist on the strontium and calcium hydroxylapatites and function as the adsorption sites for various molecules such as H_2O, CO_2 and organic molecules. A Liart of adsorbed H_2O, CO_2 and CH_3OH were chemisorbed. The mechanism of chemisorption was clarified by FTIR.2)Preparation and characterization of noble iron oxidesThe iron oxides prepared in the presence of various chelating agents showed the characteristic adsorption properties such as selective adsorption of H_2O.3)Preparation and adsorptive property of microporous hematiteThe hematite(alpha-Fe_2O_3) Produced by outgassing delta-FeOOH above 200ﾟC was found to have-slit-like micropores of 0.8 nm width. The states of the surface FE-OH groups of this hematite and of the adsorbed molecules in the micropores were investigated by FTIR. The adsorption of molecules in the slit-like micropore depended on their dipole moments, molecular sizes and chemical reactivities.4)Step-like adsorption isotherm and surface heterogeneityStep-like isotherms were discovered on the adsorption of H_2O, CCl_4, C_6H_6 and n-C_6H_<14>. This result was explained based on the, chemically and geometrically heterogeneity of gamma-FeOOH surface.5)Preparation and characterization of monodispersed spherical metal phosphate particlesThe mondispersed particles of cobalt and nickel phosphates were characterized by various techniques. The layer structures of these particles led to the selective adsorption of H_2O. The particles treated above 100ﾟC possessed a hollow structure.