Isotherm models of adsorption processes on adsorbents and nanoadsorbents

Owing to its inexpensive, facile, and eco-friendly nature, adsorption process has enjoyed considerable attention in purification and separation industries. Its importance necessitates extraordinary endeavors in its modeling. This chapter discusses the widely used adsorption isotherms such as adsorption empirical isotherms, isotherms based on Polanyi's theory, chemical adsorption isotherms, physical adsorption isotherms, and ion exchange model, and their related definitions, along with examples of correlated work from the recent decade.