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. 2019 Mar 26;9(17):9533–9545. doi: 10.1039/c8ra10310k

Langmuir and Freundlich isotherm parameters for the adsorption of Pb2+ onto Fe3O4@SiO2@PEI-NTDA at different temperatures.

Temp. (K) Langmuir Freundlich
R 2 K q m R 2 n K f
298 0.999 0.0786 286.9 0.756 4.20 74.77
303 0.999 0.0998 289.9 0.809 4.63 86.48
308 0.999 0.1128 290.7 0.836 4.89 92.99