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