物理化学学报 >> 2012, Vol. 28 >> Issue (06): 1425-1431.doi: 10.3866/PKU.WHXB201203091

催化和表面科学 上一篇    下一篇

γ-Al2O3/SiO2纳米颗粒混合体系表面的酸碱性质及其对重金属离子的吸附行为

黄佩佩, 孙和云, 樊佳妮, 孙中溪   

  1. 济南大学化学化工学院, 济南 250022
  • 收稿日期:2011-12-17 修回日期:2012-03-02 发布日期:2012-05-17
  • 通讯作者: 孙中溪 E-mail:sunzx@ujn.edu.cn
  • 基金资助:

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

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

HUANG Pei-Pei, SUN He-Yun, FAN Jia-Ni, SUN Zhong-Xi   

  1. School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, P. R. China
  • Received:2011-12-17 Revised:2012-03-02 Published:2012-05-17
  • Contact: SUN Zhong-Xi E-mail:sunzx@ujn.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (50874052, 20677022) and National Key Basic Research Program of China (2011CB933700).

摘要: 运用电位滴定技术研究了γ-Al2O3/SiO2纳米颗粒混合体系的表面酸碱性质; 依据滴定数据及表面配位理论恒电容模式, 利用WinSGW软件计算得出了γ-Al2O3/SiO2纳米颗粒混合体系表面的酸碱反应平衡常数:≡XOH+H+⇔≡XOH2+ (lgK1=5.06±0.05); ≡XOH⇔≡XO-+H+ (lgK2=-8.45±0.10); 在此基础上研究了不同pH 条件下重金属离子Cu2+, Pb2+ , Zn2+γ-Al2O3/SiO2纳米颗粒混合体系表面的吸附行为, 并用WinSGW软件模拟得出了Cu2+, Pb2+, Zn2+在该混合悬浮液体系中的表面配位常数: ≡XOH+M2+⇔≡XOM++H+ [lgK=-2.20, -1.72, -2.90(M=Cu, Pb, Zn)].

关键词: γ-Al2O3/SiO2纳米颗粒混合体系, Cu2+, Pb2+, Zn2+, 酸碱, 表面配位, 平衡常数

Abstract: 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)]

Key words: γ-Al2O3/SiO2 nano-mixed system, Cu2+, Pb2+, Zn2+, Acid-base, Surface complexation, Equilibrium constant

MSC2000: 

  • O647