Citation: LIU Jia, ZHANG Wei-Min, HUANG Pei-Pei, FAN Jia-Ni, SUN Ren-Gui, SUN Zhong-Xi. Surface Complexation Reactions in a Mixed α-Fe₂O₃,γ-Al₂O₃ and SiO₂ Suspension[J]. Acta Physico-Chimica Sinica, ;2011, 27(01): 186-192. doi: 10.3866/PKU.WHXB20110115 shu

Surface Complexation Reactions in a Mixed α-Fe₂O₃,γ-Al₂O₃ and SiO₂ Suspension

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

Received Date: 12 July 2010
Available Online: 29 November 2010
Fund Project: 国家自然科学基金(20677022, 50874052)资助项目 (20677022, 50874052)

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⁺(lgK_a1=-4.23), ≡XOH?≡XO^-+H⁺(lgK_a2=-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.
- Fe₂O₃,
- Al₂O₃,
- SiO₂,
- Mixed system,
- Surface complexation,
- Surface acid-base property
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Surface Complexation Reactions in a Mixed α-Fe2O3,γ-Al2O3 and SiO2 Suspension

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通讯作者: 陈斌, bchen63@163.com

Surface Complexation Reactions in a Mixed α-Fe₂O₃,γ-Al₂O₃ and SiO₂ Suspension