The effect of nanoparticle size is not well understood. Therefore,
it is essential to study the effect of particle size on the thermodynamics
of nanoadsorption. Zhang et al. [8] and Lu et al. [9] concluded
that the equilibrium adsorption constant increases with
decreasing material size. Pettibone et al. [10] investigated nano-
TiO2 adsorption for organic acids and reported differences in measured
Langmuir adsorption constants for 5 and 32 nm-sized particles.
Zhou et al. [11] showed that the adsorption equilibrium
constant decreases with decreasing nanoparticle size.
Most studies have focused on thermodynamic properties of
nanoparticle adsorption, in which the particle size was a constant
value or a range. However, few studies have investigated the
effects of different particle sizes on thermodynamic properties.
Venkatesha et al. [12] tested the adsorption behavior of MgO over
a crystallite size range of 25–30 nm and calculated the standing