Adsorption-Desorption Characteristics of Water Vapor on Functional Cattle Bone-Originated Apatites Powders with Mesopores
Adsorption-Desorption Characteristics of Water Vapor on Functional Cattle Bone-Originated Apatites Powders with Mesopores
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介孔功能性牛骨磷灰石粉体水蒸气吸附-解吸特性
DOI：
10.1080/10426500212292
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
T. Kanno
中科院分区：
文献类型：
--
作者：
T. Akazawa;T. Nomura;Masayoshi Kobayashi;K. Matsushima;H. Minoshima;T. Kanno
采用溶解沉淀和冷冻干燥工艺制备了牛骨磷灰石（r-HAp）微晶。获得的r-HAp颗粒具有128m 2 ;g m 1 比表面积和0.376 cm 3 ;g m 1 总孔体积和具有介孔的强碱性表面。 r-HAp粉末在288-308 K的水蒸气吸附等温线在BDDT分类中均服从IV型。在重复的吸附-解吸操作中，发现了由介孔引起的吸附滞后现象。在第一次吸附操作中获得的水蒸气吸附量比在第二次吸附操作中获得的水蒸气吸附量大，这表明部分水蒸气被吸附为不可逆吸附。 r-HAp的水蒸气吸附热为45-60 kJ;mol m 1 ，其值高于天然硅藻土。在相对分压为0-0.7时，r-HAp吸附的水蒸气量大于吸附剂（例如天然硅藻土、气溶胶二氧化硅和活性炭）的水蒸气吸附量。
Microcrystals of cattle bone-originated apatites (r-HAp) were prepared by the dissolution-precipitation and freeze-drying processes. The r-HAp particles obtained gave 128 m 2 ;g m 1 specific surface area and 0.376 cm 3 ;g m 1 total pore volume and strong basic surface with mesopores. All the adsorption isotherms of water vapor at 288-308 K for the r-HAp powders obeyed IV-type in a classification of the BDDT. In the repeated adsorption-desorption operations, an adsorption hysteresis resulting from mesopores was recognized. The amounts of water vapor adsorbed obtained in the first adsorption operation were larger than those in the second adsorption operation, indicating that some portion of water vapor adsorbed to be irreversible adsorption. The water vapor-adsorption heats for the r-HAp were 45-60 kJ;mol m 1 , whose values were higher than natural diatomite. The amounts of water vapor adsorbed for the r-HAp were larger than those for the adsorbents, such as natural diatomite, aerosol silica, and activated carbon, at the relative partial pressures of 0-0.7.