Differential Kinetics And Error Analysis

2413 WordsAug 22, 201610 Pages
3.6.3. Adsorption kinetics and error analysis It is known that converting the non-linear regression to linear form of most kinetic models may lead to positive or negative effect on determining the kinetic parameters of the adsorption process [34]. In this study non-linear and linear regression (using software Origin 8.6)of pseudo first-order, pseudo second-order and Elovich kinetic models(Table 1) were used to investigate the kinetic sand the best fit model for the uptake of MB by ZnO/CR powder at different temperatures(10, 20, 30 and 40 °C).In addition different statistical error analysis functions such as , and SSE (equations 13 - 15) were used to evaluate the validity of the used models and to investigate the mechanism of the adsorption process. 3.6.3.1. Effect of converting non-linear to linear form of kinetic models Kinetic parameters of adsorption of MB onto ZnO/CR Hence the adsorption rate of MB onto ZnO/CR is proportional to the concentration of MB sorbed, non-linear and linear Lagergren 's pseudo first-order (equations6 and 7) can be used to calculate the kinetic parameters. The experimental data of adsorption of MB onto ZnO/CR were treated by the non-linear equation of pseudo first-order (using fitting function builder of Origin software) to estimate the values of and from the plot of versus (Figure 9a).Then the values of converted to and plotted versus according to the linear equation of pseudo first-order equation to calculate the values of and

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