| Surface Acidity of Amorphous Aluminum Hydroxide |
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| 作者姓名： | K. FUKUSHI K. TSUKIMURA H. YAMADA |
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| 作者单位： | [1]Research Center for Deep Geological Environments, National Institute of Advanced Industrial Science and Technology （AIST）, Tsukuba, Ibaraki 305-8567, Japan [2]Ecomaterials Center, National Institute for Materials Science （NIMS）, Tsukuba, Ibaraki 305- |
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| 基金项目： | We would like to express our utmost gratitude to T. Kogure, M. Manaka, M. Suzuki, S. Suzuki and K. Tamura for valuable discussions and the experimental supports. |
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| 摘 要： | The surface acidity of synthetic amorphous AI hydroxide was determined by acid/base titration with several complementary methods including solution analyses of the reacted solutions and XRD characterization of the reacted solids. The synthetic specimen was characterized to be the amorphous material showing four broad peaks in XRD pattern. XRD analyses of reacted solids after the titration experiments showed that amorphous AI hydroxide rapidly transformed to crystalline bayerite at the alkaline condition （pH〉10）. The solution analyses after and during the titration Ksp=^aAl^3＋/aH^＋^3 ,was 10^10.3. The amount of consumption of added acid or base during the titration experiment was attributed to both the protonation/deprotonation of dissolved AI species and surface hydroxyl group. The surface acidity constants, surface hydroxyl density and specific surface area were estimated by FITEQL 4.0.
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| 关 键 词： | 铝 氢氧化物 表面酸度 溶解度 结晶作用 |
| 收稿时间： | 8/8/2005 12:00:00 AM |
| 修稿时间： | 2006-01-24 |
Surface Acidity of Amorphous Aluminum Hydroxide |
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| Authors: | K;FUKUSHI;K;TSUKIMURA;H;YAMADA |
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| Abstract: | The surface acidity of synthetic amorphous Al hydroxide was determined by acid/base titration with several complementary methods including solution analyses of the reacted solutions and XRD characterization of the reacted solids. The synthetic specimen was characterized to be the amorphous material showing four broad peaks in XRD pattern. XRD analyses of reacted solids after the titration experiments showed that amorphous Al hydroxide rapidly transformed to crystalline bayerite at the alkaline condition (pH>10). The solution analyses after and during the titration experiments showed that the solubility of amorphous aluminum hydroxide, Ksp=aAl3+/aH+3 , was 1010.3. The amount of consumption of added acid or base during the titration experiment was attributed to both the protonation/deprotonation of dissolved Al species and surface hydroxyl group. The surface acidity constants, surface hydroxyl density and specific surface area were estimated by FITEQL 4.0. |
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| Keywords: | amorphous Al hydroxide acid/base titration solubility crystallization surface acidity constants surface site density FITEQL |
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