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Articles by Ren-Kou XU
Total Records ( 2 ) for Ren-Kou XU
  Yu-Jun WANG , Cheng-Bao LI , Wei WANG , Dong-Mei ZHOU and Ren-Kou XU
  Gibbs free binding energy and adsorption energy between cations and charged soil particles were used to evaluate the interactions between ions and soil particles. The distribution of Gibbs free adsorption energies could not be determined experimentally before the development of Wien effect measurements in dilute soil suspensions. In the current study, energy relationships between heavy metal ions and particles of Hapli-Udic Argosol (Alfisol) and Ferri-Udic Argosol were inferred from Wien effect measurements in dilute suspensions of homoionic soil particles (< 2μm) of the two soils, which were saturated with ions of five heavy metals, in deionized water. The mean Gibbs free binding energies of the heavy metal ions with Hapli-Udic Argosol and Ferri-Udic Argosol particles diminished in the order of Pb2+ > Cd2+ > Cu2+ > Zn2+ > Cr3+, where the range of binding energies for Hapli-Udic Argosol (7.25-9.32 kJ mol−1) was similar to that for Ferri-Udic Argosol (7.43-9.35 kJ mol−1). The electrical field-dependent mean Gibbs free adsorption energies of these heavy metal ions for Hapli-Udic Argosol and for Ferri-Udic Argosol descended in the order: Cu 2+≥Cd 2+≥Pb2+ > Zn2+ > Cr3+, and Cd2+ > Cu2+ > Pb2+ > Zn2+ > Cr3+, respectively. The mean Gibbs free adsorption energies of Cu2+, Zn2+, Cd2+, Pb2+, and Cr3+ at a field strength of 200 kV cm−1, for example, were in the range of 0.8-3.2 kJ mol−1 for the two soils.
  Yu-Jun Wang , Cheng-Bao Lia , Wei Wang , Dong-Mei Zhou , Ren-Kou Xu and Shmulik P. Friedman
  Gibbs mean free adsorption energies between cations and charged soil particles are a measure of physicochemical interactions between ions and soil particles. The distribution of Gibbs free adsorption energies could not be determined experimentally before the development of Wien effect measurements in dilute soil suspensions. In the present study, energy relationships between heavy metal ions and particles of yellow-brown and black soils (an Alfisol and a Mollisol) were inferred from Wien effect measurements in dilute suspensions, in deionized water, of homoionic soil particles (<2 µm) of the two soils saturated with ions of five heavy metals. The results show that the mean Gibbs free binding energies of the heavy metal ions with yellow-brown and black soil particles diminish in the order Pb2+ > Zn2+ >= Cu2+ > Cd2+ > Cr3+, where the range of binding energies for yellow-brown soil (5.39–8.54 kJ mol–1) is less than that for black soil (8.39–9.88 kJ mol–1). The electrical field-dependent mean Gibbs free adsorption energies of these heavy metal ions for yellow-brown and black soils descend in the order Cu2+ > Cd2+ > Pb2+ > Zn2+ > Cr3+ and Cu2+ > Zn2+ > Pb2+ > Cd2+ > Cr3+, respectively. The mean Gibbs free adsorption energies of Cu2+, Zn2+, Cd2+, Pb2+, and Cr3+ at a field strength of 150 kV cm–1, for example, are in the range of 0.5 to 2.1 kJ mol–1 for the two soils.
 
 
 
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