Effects of Cu(II) on the Adsorption Behaviors of Cr(III) and Cr(VI) onto Kaolin
The Cr(III) (a) or Cr(VI) (b) adsorption kinetics onto kaolin in the absence and presence of Cu(II). The ▲ and ◆ are the measured data. The dashed and solid curves are fittings using pseudofirst-order and second-order models, respectively (adsorption conditions: for Cr(III) = 300 mg·L−1, for Cr(VI) and Cu(II) = 200 mg·L−1, pH = 4.5, and temperature = 25°C).
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