《Table 3–Pseudo-second order and pseudo-first order kinetic parameters of the adsorption of MB on Co

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《Effect of Co(Ⅱ) dopant on the removal of Methylene Blue by a dense copper terephthalate》

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The adsorption kinetics of Co22-CuBDC and CuBDC were studied at 30°C using MB solution at initial concentration of100 mg/L.The MB adsorption of Co22-CuBDC and CuBDC were fitted by using pseudo-first order and pseudo-second order models as shown in Fig.12.The data were best fitted with pseudo-second order models（R2>0.99）.As the adsorption kinetics of these two materials fits well with the pseudosecond order model，this suggests that the adsorption process of MB may influence by chemisorption.The pseudo-second order rate constant（k2）and the amount of MB adsorbed at equilibrium（Qe，cal）for each material were calculated from the slope and the intercept and were presented in Table 3.The observed and calculated adsorption capacities are in good agreement where Co22-CuBDC shows a minor drop of adsorption performance.This could happen since doping of Co（II）can be done in such a large range of metal content，e.g.，up to 22%.Introducing such amount of Co（II）might exceed the optimal dopant content that yields the highest adsorption capacity（Chekuri and Tirukkovalluri，2017）.To prove this assumption，furtherinvestigationontheadsorption performance of CuBDC containing different amounts of Co（II）need to be conducted.