二氧化硅-水溶液界面上的酸度和碱金属吸附
Acidity and alkali metal adsorption on the SiO2-aqueous solution interface.
作者信息
Zuyi Tao, Hongxia Zhang
机构信息
College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, People's Republic of China.
出版信息
J Colloid Interface Sci. 2002 Aug 1;252(1):15-20. doi: 10.1006/jcis.2002.8277.
The intrinsic deprotonation constant (pK(a(2))(int)) and the intrinsic ion exchange constants (pK(Me(+))(int)) of Li(+), Na(+), and K(+) on SiO(2) were uniquely determined at 30 degrees C by using the potentiometric titration data, the Gouy-Chapman-Stern-Grahame (GSCG) model for the structure of the electrical double-layer (edl) and the double-extrapolation method. The values of these constants were pK(a(2))(int) = 6.57, pK(Li(+))(int) = pK(Na(+))(int) = pK(K(+))(int) = 5.61. The chemical meaning of intrinsic equilibrium constants and the equality in the values of pK(Li(+))(int), pK(Na(+))(int) and pK(K(+))(int) were discussed.
通过电位滴定数据、用于双电层（edl）结构的古依-查普曼-斯特恩-格雷厄姆（GSCG）模型以及双外推法，在30℃下唯一确定了Li⁺、Na⁺和K⁺在SiO₂上的固有去质子化常数（pK(a(2))(int)）和固有离子交换常数（pK(Me⁺)(int)）。这些常数的值为pK(a(2))(int)=6.57，pK(Li⁺)(int)=pK(Na⁺)(int)=pK(K⁺)(int)=5.61。讨论了固有平衡常数的化学意义以及pK(Li⁺)(int)、pK(Na⁺)(int)和pK(K⁺)(int)值的相等性。
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