钽掺杂六方相氧化钨对Sr2+的吸附:Zeta电位的测量及吸附机理的研究

doi:10.3866/PKU.WHXB201604213

Abstract

Abstract:

The adsorption of Sr²⁺ ions onto Ta-doped hex-WO₃ nanomaterials was studied by measuring the zeta potentials of the powder nanoparticles and by determining the adsorption isotherm and adsorption mechanism. Five important results were obtained: (1) the zeta potential values of the Ta-doped hex-WO₃ suspensions in different electrolyte solutions, within the studied pH ranges, increased with an increase in electrolyte valence; and (2) the zeta potential of the Ta-doped hex-WO₃ suspensions increased with an increase in ionic strength. (3) Sr²⁺ ion adsorption increased with a decrease in temperature and ionic strength. (4) The adsorption enthalpy was calculated as-47 kJ·mol^-1, and the interaction between the Ta-doped hex-WO₃ surface and Sr²⁺ ions was concluded to be chemical in nature. (5) The adsorption of Sr²⁺ ions onto the Ta-doped hex-WO₃ was attributed to surface chemical adsorption and ion exchange (in tunnels).

Key words: Ta, hex-WO₃, Zeta potential, Sr²⁺, Adsorption mechanism

Yuan JIAN,Wan-Jun MU,Ning LIU,Shu-Ming PENG. Removal of Sr²⁺ Ions by Ta-Doped Hexagonal WO₃: Zeta Potential Measurements and Adsorption Mechanism Determination[J]. Acta Phys. -Chim. Sin. 2016, 32(8), 2052-2058. doi: 10.3866/PKU.WHXB201604213

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Removal of Sr²⁺ Ions by Ta-Doped Hexagonal WO₃: Zeta Potential Measurements and Adsorption Mechanism Determination

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Removal of Sr²⁺ Ions by Ta-Doped Hexagonal WO₃: Zeta Potential Measurements and Adsorption Mechanism Determination