Citation: ZHANG Wei-Min, YANG Zhen-Dong, LIU Jia, SUN Zhong-Xi. Determination of Acid-Base Equilibrium Constants on Aqueous Mesoporous Silica Surfaces[J]. Acta Physico-Chimica Sinica, ;2010, 26(08): 2109-2114. doi: 10.3866/PKU.WHXB20100801 shu

Determination of Acid-Base Equilibrium Constants on Aqueous Mesoporous Silica Surfaces

1.
School of Chemistry & Chemical Engineering, University of Jinan, Jinan 250022, P. R. China

Received Date: 10 March 2010
Available Online: 18 May 2010
Fund Project: 国家自然科学基金(20677022)资助项目 (20677022)

We used the potentiometric titration technique to study the deprotonation reactions at aqueous mesoporous silica surfaces. The concentration of surface proton binding sites was obtained by the Gran plot method using the acid-base titration data. The relevant equilibrium constants of the surfaces in terms of the constant capacitance model (CCM) were determined based on the experimental results using the FITEQL 4.0 program. The results indicate that the surface deprotonation behavior of the mesoporous silica suspensions is significantly different from that of amorphous silica. This behavior can be described by two surface reactions with surface bidentate and monodentate deprotonation constants of pK_a1=6.78±0.15 and pK_a2=10.25±0.22, respectively. Using these deprotonation constants, we established a surface speciation diagram for mesoporous silica in aqueous suspensions as a function of pH and discussed the effect of surface capacitance on surface speciation.
- Equilibrium constant,
- Mesoporous silica,
- Surface,
- Acid-base reaction,
- Constant capacitance
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沈阳化工大学材料科学与工程学院沈阳 110142