Adsorption thermodynamics and kinetics of nanomaterials: theory and experimental insight into nano-effect

Mengying Wang; Yongqiang Xue; Jianping Du

doi:10.1063/5.0186450

Adsorption thermodynamics and kinetics of nanomaterials: theory and experimental insight into nano-effect

J Chem Phys. 2023 Dec 21;159(23):234106. doi: 10.1063/5.0186450.

Authors

Mengying Wang¹, Yongqiang Xue², Jianping Du^{1

2

3}

Affiliations

¹ College of Chemical Engineering and Technology, Taiyuan University of Technology, Taiyuan 030024, People's Republic of China.
² College of Chemistry, Taiyuan University of Technology, Taiyuan 030024, People's Republic of China.
³ Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization, Taiyuan 030024, People's Republic of China.

PMID: 38099544
DOI: 10.1063/5.0186450

Abstract

Nanomaterials have excellent adsorption performance due to nano-effect and have been widely used in many fields. The adsorption performance of nanomaterials depends on their adsorption thermodynamics and kinetics. Here, the thermodynamic and kinetic equations of adsorption for spherical nanoparticles are first derived in theory. The mechanisms and regularities of influences of nano-effect on thermodynamics and kinetics, using nano-CdS adsorption of methylene blue as a probe, were investigated. The results show that there are significant influences of nano-effect (i.e., interface area effect and interface tension effect) on the thermodynamics and kinetics of nanoparticle adsorption. When the particle radius is larger and beyond the nanometer scale (∼100 nm), the nano-effect can be neglected. When the radius of the nanoparticle is within 10-50 nm, the nano-effect of adsorption is mainly the interface area effect. When the radius is less than 10 nm, the influences of both the interface area effect and the interface tension effect on adsorption thermodynamics and kinetics become more significant. The theoretic equations and experimental insights in the present work could provide a significant basis and reference for improving and perfecting the adsorption theory involving nanomaterials and provide guidelines for the explanations of adsorption mechanisms as well as the selection of adsorbents.