Cu2+ Adsorption of Black Soil and Chernozem and Its Influencing Factors
Using black soil and chernozem as tested soil,the effects of pH value,ionic strength,temperature and reaction time on adsorption behaviors of Cu2+ were studied by the batch equilibrium method,which provides basic data for Cu2+ application and pollution prevention on the two types of soil.The results showed that Cu2+ adsorption of the two types of soil increased with the increase of pH.When the pH was higher than 7,their adsorption amount was saturated.The amount of Cu2+ adsorbed by chernozem was higher than that of black soil.However,Cu2+ adsorption decreased with the increase of ionic strength.The absorption ratio decreased significantly in the NaNO3 solution with the concentration between 0-0.2 mol/L.With temperature and initial Cu2+ concentration increasing in the solution,the absorption ratio of Cu2+ increased in both samples.The best way to describe the relationship between absorption ratio and temperature was Freundlich and Langmuir equations.Apparent thermodynamic parameters showed that Cu2+absorption of the two types of soil was spontaneous,during which heat was absorbed and entropy was accumulated.For the Cu2+ adsorption kinetics process,Elovich Equation and Parabolic Diffusion Equation were more available to black soil and chernozem analysis.
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NSTL
万方数据
维普
