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. 2021 Aug 12;6(33):21339–21349. doi: 10.1021/acsomega.1c01588

Table 5. Parameter Fits of Models of Langmuir, Freundlich, Redlich–Peterson, and Sips to Experimental Data of Glyphosate Adsorption.

glyphosate
two-parameter models
  Langmuir model
 Freundlich model
sample Qo (mg g–1) KL (mL mg–1) R2 KF (mL g–1) 1/n R2
SBA-15 10.3 0.064 0.939 2.691 0.251 0.960
SBA-15-NH2 14.4 0.132 0.979 5.126 0.205 0.994
three-parameter models
  Redlich–Peterson model
 Sips model
sample KRP (mg g–1) αRP (mL mg–1) β R2 Qo (mg g–1) KS (mL mg–1) 1/ns R2
SBA-15 2.509 0.721 0.796 0.957 49.31 0.056 0.288 0.959
SBA-15-NH2 388.8 73.10 0.803 0.994 70.84 0.075 0.242 0.994