From:  Controlled release of dexamethasone phosphate from modified mesoporous biocompatible silica nanoparticles: synthesis, characterization, and kinetic studies
 

Adsorption parameters and results for adsorption isotherm models

ModelParameter4°C25°C37°C
Langmuirqm (mg mg–1)0.0043 ± 0.0004 (R2 = 0.7863)0.0045 ± 0.0002 (R2 = 0.9432)0.0236 ± 0.0169 (R2 = 0.9617)
Ka (L mmol–1)0.0314 ± 0.01260.1013 ± 0.01150.8702 ± 0.7818
FreundlichKF (L g–1)0.0064 ± 0.00100.0047 ± 0.00020.0195 ± 0.0036
n0.3652 ± 0.08240.3615 ± 0.02580.9347 ± 0.1200
Dubinin-RadushkevichqDR (μmol g–1)8,882 ± 801.88,236 ± 210.012,613 ± 2,553.0
KDR (mol2 k–1J–2)0.0113 ± 0.00250.0184 ± 0.00110.0256 ± 0.0089
TemkinKT (mL mg–1)1,782 ± 253.61,555 ± 79.42,400 ± 400.1
b (J mol–1)268.9 ± 123.5178.5 ± 31.0112.0 ± 44.4
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qm: maximum adsorption capacity; Ka: Langmuir constant; KF: adsorption capacity constant; n: heterogeneity factor; qDR: Dubinin-Radushkevich maximum adsorption capacity; KDR: Dubinin-Radushkevich isotherm constant; KT: equilibrium binding constant; b: Temkin constant