Adsorption of pyridine from aqueous solutions by crushed carbon adsorbents

Abstract

The adsorption of pyridine under static conditions from aqueous solutions by activated carbons
differing in raw materials, the production method, the characteristics of the porous structure and chemical
state of the surface was investigated. It was established that the form of the resulting adsorption isotherms
suggests a strong specific (chemical) interaction of the sorbent – sorbate. The main parameters of adsorption
were calculated using the theories of Langmuir and BET. It was determined that the adsorption of pyridine
from aqueous solutions is influenced by a combination of factors – the characteristics of the porous structure
and chemical state of the surface of the adsorbent. Monomolecular adsorption of pyridine is implemented by
the specific interaction between the adsorbent – adsorbate, the type of which (hydrogen bond and/or donoracceptor
interaction) depends on the prevalence of acidic or basic groups on the surface of the adsorbent. The
forming of the second layer of the component occurs due to the dispersion interaction.