Size and Morphology Dependent Kinetics and Thermodynamics of Adsorptions of Basic Fuchsin on Nano-TiO2

Nanoparticles have superior adsorption properties compared with corresponding bulk materials, which depends on their particle size and morphology. Herein, by introducing morphology factors, we derived the general relations of adsorption kinetic parameters and thermodynamic properties with an equivalent particle diameter of nanoparticles with different morphologies. Experimentally, we researched the adsorption kinetics and thermodynamics of basic fuchsin on nano-TiO2 with different equivalent particle diameters and morphologies. The results show that the equivalent particle diameter and morphology have significant effects on the adsorption kinetics and the adsorption thermodynamics. Within the range of the experiment, the adsorption rate constant and the equilibrium constant increase, while the activation energy, the pre-exponential factor, the Gibbs free energy, the enthalpy, and the entropy of adsorption decrease with the decrease in the equivalent particle diameter, and the logarithm of rate constant, a...