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Citation: HUANG Pei-Pei, SUN He-Yun, FAN Jia-Ni, SUN Zhong-Xi. Acid-Base Properties and Adsorption Behaviors of Heavy Metal Ions at the Surface of γ-Al2O3/SiO2 Nano-Mixed System[J]. Acta Physico-Chimica Sinica, ;2012, 28(06): 1425-1431. doi: 10.3866/PKU.WHXB201203091 shu

Acid-Base Properties and Adsorption Behaviors of Heavy Metal Ions at the Surface of γ-Al2O3/SiO2 Nano-Mixed System

  • 1.

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

  • Received Date: 17 December 2011
    Available Online: 9 March 2012

    Fund Project: 国家自然科学基金(50874052, 20677022) (50874052, 20677022)国家重大科学研究计划(2011CB933700)资助项目 (2011CB933700)

  • The surface acid-base properties of a γ-Al2O3/SiO2 nano-mixed system were studied by potentiometric titration technique. Based on experimental data complemented by surface complexation theory of Constant Capacitance Model, the relevant equilibrium constants of surface acid-base reactions in the nano-mixed system were calculated using the WinSGW program as: ≡XOH+H+⇔≡XOH2+ (lgK1=5.06± 0.05); ≡XOH⇔≡XO-+H+ (lgK2=-8.45±0.10). Furthermore, the adsorption of heavy metal ions (Cu2+ , Pb2+ , Zn2+ ) at the surface of the γ-Al2O3/SiO2 nano-mixed system was studied as a function of pH. Again using WinSGW software, the surface complexation constants of Cu2+, Pb2+ and Zn2+ ions in aqueous suspensions of γ-Al2O3/SiO2mixed systems were established respectively as: ≡XOH+M2+⇔≡XOM++H+ [lgK=-2.20, -1.72, -2.90 (M=Cu, Pb, Zn)]
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