Equilibrium characteristics of sorption of some phenolic compounds by FIBAN A-1 fiber from aqueous solutions

Many phenolic compounds are related to the group of toxic substances, the occurrence of which in wastewater has a negative impact on the environment. In addition to extraction, biochemical, and membrane methods for the isolation of hydroxybenzenes from aqueous media, sorption methods using active carbon, nonionic polymers, and ion-exchange materials are also actively used. The purpose of this work was to establish the features of the sorption of phenol, resorcinol and phloroglucinol from aqueous solutions with FIBAN fibers. Sorption was studied under static conditions at a temperature of 298 K. An assessment of the amount of absorbed sorbates by fibers of various nature indicates that FIBAN A-1 fiber exhibits better capacity characteristics relative to phenolic compounds. This fact is due to the nature of the matrix (styrene-divinylbenzene) and the high basicity of the functional groups of this sorbent, which increase the number of sorption centers for the uptake of hydroxybenzenes. The isotherms of the sorption of phenol, resorcinol and phloroglucin in the concentration range 0.5-10 mmol/dm3 indicate the affinity of FIBAN A-1 to these sorbates. In the entire range of concentrations studied, the highest recovery rates are characteristic of trihydroxybenzene. The paper provides a formal analysis of the obtained equilibrium curves based on the choice of the sorption equation that most closely describes the experimental dependences. The apparent constants of sorption equilibrium are calculated, the energy characteristics of uptake process are estimated.