Table 2 Isotherm models used to describe the sorption behavior of karaya gum
Isotherm model | Mathematical expression | References |
|---|---|---|
GAB (Guggenheun–Anderson–de-Boer) | \(M = \frac{{M_{{\text{o}}} CKa_{{\text{w}}} }}{{\left( {1 - Ka_{{\text{w}}} } \right)\left( {1 - Ka_{{\text{w}}} + CKa_{{\text{w}}} } \right)}}\) | Quirijns et al. (2005) |
Hasley | \(a_{{\text{w}}} = \exp \left( {\frac{ - a}{{M^{b} }}} \right)\) | Halsey (1948) |
Iglesias and Chirife | \(M = a + b\left( {\frac{{a_{{\text{w}}} }}{{1 - a_{{\text{w}}} }}} \right)\) | Iglesias and Chirife (1982) |
Curie | \(M = \exp \left( {a + ba_{{\text{w}}} } \right)\) | Caurie (1970) |
BET (Brunauer Emmett and Teller) | \(M = \frac{{CM_{{\text{o}}} a_{{\text{w}}} }}{{\left[ {\left( {1 - a_{{\text{w}}} } \right) + \left( {C - 1} \right)\left( {1 - a_{{\text{w}}} } \right)a_{{\text{w}}} } \right]}}\) | Brunauer (1938) |