Adsorptive modelling of toxic cations and ionic dyes onto cellulosic extract

Abstract

This work reports the abstractive potential of Parkia Biglobosa seed waste (PSW) and Parkia Biglobosa cellulosic extract (PBCE) for the removal of Cr(VI), Pb(II), methylene blue (MB) and congo red (CR) from aqua system. Physicochemical analyses carried out for these biomaterials were proximate analysis, Fourier transform infra red (FTIR) Spectrophotometry and scanning electron microscopy (SEM). The FTIR data showed that –O–H, –C=C–, –C=O, –C≡C– and –S–H functional groups were responsible for the sequestration of Cr(VI), Pb(II), MB and CR from aqua system. The equilibrium data fitted best to Langmuir isotherm model with the highest adsorption obtained for MB, being 1498.42 mg/g at 298 K and 403.23 mg/g at 298 K for PSW and PBCE respectively. Pseudo-second order model gave the best fits for the kinetic data among two other kinetic models used. The PSW and PBCE biomaterials demonstrated good potentials for the removal of toxic Cr(VI), Pb(II), MB and CR from aqua systems.