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PubMed · 12924136

[Cu adsorption by phaeozem and burazem].

Ying Yu·Qixing Zhou·Xin Wang·Liping Ren
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Abstract

Studies on the thermodynamics and kinetics of copper (Cu2+) adsorption by phaeozem and burozem showed that that the adsorption of Cu2+ by these two soils was increased with the increasing concentration of Cu2+ within the range of Cu2+ concentrations used in the experiment, but the amount of Cu2+ adsorbed and fixed on phaeozem was much higher than that on burozem. When the test Cu2+ concentration in adsorption equilibrium was 95 mg.kg-1, its adsorption by burozem was nearly 3720 mg.kg-1, whereas by phaeozem was as high as 6076 mg.kg-1. Under the highest CuCl2 treatment of 400 mg.kg-1, Cu2+ adsorbed by phaeozem and burozem was 6159.0 mg.kg-1 and 4736.6 mg.kg-1, respectively. The adsorption of Cu2+ by the test soils could significantly conform to the Freundlich and Temkin equation, while Langmuir equation was not applicable to describe the isothermal adsorption processes of Cu2+ by the two soils. The adsorption of Cu2+ by the test soils was very rapid, which could reach its balance after 15-20 min. The adsorption within the first 2 min at its beginning stage accounted for 90% of the Cu equilibrium adsorption. The adsorptive rate of Cu2+ by phaeozem was decreased more quickly than that by burozem with the time. The two-constant equation was the optimal model to describe the adsorption of Cu2+. The other models in point were first-order dynamic equations and Elovich equations, whereas parabolic diffusion equations were not suitable ones.

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AdsorptionCopperKineticsSoilThermodynamicsJournal ArticleResearch Support, Non-U.S. Gov't

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Ying Yu, Qixing Zhou, Xin Wang, Liping Ren. 2003. [Cu adsorption by phaeozem and burazem].. https://pubmed.ncbi.nlm.nih.gov/12924136/

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