α-Fe2O3/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

doi:10.3866/PKU.WHXB201206072

Abstract

Abstract:

α-Fe₂O₃and SiO₂were prepared from ferric nitrate and TEOS by sol-gel method in combination with using templates. The synthetic samples were characterized by powder X-ray diffraction (XRD) and N₂adsorption/desorption methods. We determined the surface acid-base properties of α-Fe₂O₃/SiO₂nano-mixed system by potentiometric titration technique, and studied the adsorption behaviors of heavy metal ions on the solid surface of α-Fe₂O₃/SiO₂nano-mixed system at different pH values. According to the above experimental data, we calculated the surface acid-base reaction equilibrium constants of the nano-mixed system using WinSGW software to be ≡XOH ⇔ ≡XO^-+ H⁺(lg K = -8.19±0.15). The calculated result reveals that the single deprotonation surface of α-Fe₂O₃/SiO₂nano-mixed systemis obviously different from the surfaces of α-Fe₂O₃/SiO₂/γ-Al₂O₃, α-Fe₂O₃/γ-Al₂O₃and SiO₂/γ-Al₂O₃nano-mixed system with surface protonation as well as deprotonation at the same time. Based on the above result, the surface complexation constants of Cu²⁺, Pb²⁺, Zn²⁺on the surface of α-Fe₂O₃/SiO₂mixed systems were simulated respectively as follows:
≡XOH + M²⁺⇔ ≡XOM⁺+ H⁺ [lg K =-3.1, -3.6, -3.8 (M = Cu, Pb, Zn)].

Key words: α-Fe₂O₃/SiO₂, Surface acid-base property, Adsorption, Heavy metal ions, Speciation

SUN He-Yun, FAN Jia-Ni, HUANG Pei-Pei, SUN Zhong-Xi. Acid-Base Properties and Adsorption Behaviors of Heavy Metal Ions at the Surface of α-Fe₂O₃/SiO₂Nano-Mixed System[J]. Acta Phys. -Chim. Sin. 2012, 28(09), 2183-2190. doi: 10.3866/PKU.WHXB201206072

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Acid-Base Properties and Adsorption Behaviors of Heavy Metal Ions at the Surface of α-Fe₂O₃/SiO₂Nano-Mixed System

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Acid-Base Properties and Adsorption Behaviors of Heavy Metal Ions at the Surface of α-Fe2O3/SiO2Nano-Mixed System

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Acid-Base Properties and Adsorption Behaviors of Heavy Metal Ions at the Surface of α-Fe₂O₃/SiO₂Nano-Mixed System