《Table 3.Fitting parameters for As adsorption by Freundlich and Langmuir isotherm models》

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《"Synthesis, characterization, and property test of crystalline polyferric sulfate adsorbent used in treatment of contaminated water with a high As(Ⅲ) content"》

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where Q is the amount of As adsorbed on the samples at equilibrium；C is the As equilibrium concentration in solution（μg/m L）；and K and 1/n are the Freundlich constants.K represents the adsorption of As at equilibrium concentrations，and 1/n indicates the degree to which adsorption is a function of As concentration.The results of these parameters obtained by nonlinear fitting are summarized in Table 3.According to the results，the K value in P-1.0 is the maximum indicating the largest adsorption capacity.The 1/n values for all the three samples are less than unity，suggesting a greater completion for adsorption sites，which become limited as the solute concentration in solution increases[27].The R2 obtained from the Freundlich model fitting on the samples are 0.85，0.52，and 0.92，indicating a poor degree of fitting on P-1.0 and better on P-0.8 and P-1.2，which could be attributed to a difference in the inner structure of the samples.