地质学报（英文版）2006，Vol.80Issue(2)：206-211,6.
Surface Acidity of Amorphous Aluminum Hydroxide
Surface Acidity of Amorphous Aluminum Hydroxide
摘要
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+/a3H+,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.关键词
amorphous Al hydroxide/acid/base titration/solubility/crystallization/surface acidity constants/surface site density/FITEQLKey words
amorphous Al hydroxide/acid/base titration/solubility/crystallization/surface acidity constants/surface site density/FITEQL分类
天文与地球科学引用本文复制引用
K. FUKUSHI,K. TSUKIMURA,H. YAMADA..Surface Acidity of Amorphous Aluminum Hydroxide[J].地质学报（英文版）,2006,80(2):206-211,6.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. （）
