《Table 3 Adsorption kinetics parameters》

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《低成本制备MCM-41介孔分子筛及其对镉离子的吸附性能（英文）》

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For the purpose of this kinetic study，metal ion solutions with an initial concentration of 25 mg/L were agitated in the presence of 130 mg of adsorbent at 25°C for different contact times（10，20，30，45，60，75，and120 min）.The kinetic experimental data were fitted to the pseudo-first-order and pseudo-second-order kinetic models as shown in Fig.11a and Fig.11b，respectively.The pseudo-first-order kinetic model had poor convergence against the experimental data，suggested by a correlation coefficient of 0.93.However，the pseudo-second-order rate equation for the adsorption of Cd2+ions by MCM-41 converged well to theexperimental data，with a straight line fit and correlation coefficient of 0.98.Table 3 lists the absorption kinetic parameters.