物理化学学报2011，Vol.27Issue(1)：186-192,7.
α-Fe2O3、γ-Al2O3、SiO2混合体系的表面配位反应
Surface Complexation Reactions in a Mixed α-Fe2O3、γ-Al2O3 and SiO2 Suspension
摘要
Abstract
We systematically studied the surface acid-base properites and complexation behavior of heavy metal ions in aqueous suspensions of α-Fe2O3, γ-Al2O3, SiO2 of mixed oxides and the α-Fe2O3/γ-Al2O3/SiO2 mixed systems using potentiometric titrations in combination with computer-based calculations using the constant capacitance model (CCM).The experimental and calculated results reveal that the surface chemical reactions in the mixed system are quite different from the sum of the individual single systems.A complicated mutual interaction exists among these mineral surfaces.The surface chemical reaction models and relevant equilibrium constants in the mixed system are: ≡XOH2+(=)≡XOH+H+(lgKa1=-4.23),≡XOH(=)≡XO-+H+(lgKa2=-8.41).The surface complexation model and related equilibrium constants for Cu2+, Pb2+, and Zn2+ in the mixed system can be described by following reaction: ≡XOH+M2+(=)≡XOM++H+,with lgK of -2.20, -1.90, -3.20 for Cu2+, Pb2+, Zn2+, respectively.关键词
Fe2O3/Al2O3/SiO2/混合体系/表面配位/表面酸碱性分类
化学化工引用本文复制引用
刘嘉,张卫民,黄佩佩,樊佳妮,孙仁贵,孙中溪..α-Fe2O3、γ-Al2O3、SiO2混合体系的表面配位反应[J].物理化学学报,2011,27(1):186-192,7.基金项目
国家自然科学基金(20677022,50874052)资助项目 （20677022,50874052）
