model has three parameters and incorporates the advantages of
both models, where aR (l/g) and a (l/mg) are Redlich–Peterson
isotherm constants and b is the exponent which lies between 0 and
1. The R–P model has two limiting cases. When b = 1, the Langmuir
equation results, whereas when b = 0, the R–P equation transforms
to the Henry’s law equation. In this study, b values approximately
equal to 1 indicate monolayer adsorption of 2,4,6-TCP onto
surfactant clay.