Optimization of synthesis conditions for graft copolymerization of methacrylic acid onto Garcinia kola pods and use in the sequestration of cationic dyes from simulated wastewaters

Oninla, Vincent O.; Awokoya, Kehinde N.; Babalola, Jonathan O.; Balogun, Kolawole I.; Ismail, Opeyemi S.

doi:10.1007/s13399-022-03443-8

Cited by 6 publications

(1 citation statement)

References 82 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The change in Gibbs free energy (∆G ) calculated was negative, for the sorption of BCG on MIP and NIP, at all the temperatures investigated. This suggests that the process was spontaneous and feasible (Oninla et al 2022). The negative values o obtained for the entropy change (∆S ) and o enthalpy change (∆H ) imply a decrease in disorderliness at the solid/solution interface and the exothermic nature of the processes.…”

Section: Isothermal Modeling Of Bcg Removalmentioning

confidence: 90%

Preparation of styrene-based imprinted polymer for the adsorption of hazardous bromocresol green dye: Equilibrium, kinetics and thermodynamics study

Awokoya,

Oninla,

Ogunkunle

et al. 2024

ijs

View full text Add to dashboard Cite

In this study, styrene was used as a functional monomer for the production of molecularly imprinted polymer (MIP) via free radical polymerization method, using bromocresol green dye (BCG) as template. A non-imprinted polymer (NIP), that excluded the template, was also synthesized. Both polymers were applied for the removal of BCG from aqueous medium. The synthesized polymers were characterized with Fourier transform infrared spectroscopy, scanning electron microscopy, and X-ray powder diffraction spectroscopic techniques. The effect of operating variables, such as pH, contact time, initial dye concentration and process temperature, on the efficiencies of the polymers in removing the dye were evaluated. Equilibrium time of BCG adsorption onto the MIP was reached within 40 min, with adsorption capacity of 49.68 mg g-1 . The adsorption process followed the pseudo-second-order kinetic and Freundlich isotherm models, while chemisorption mechanism was predicted. The adsorption process was spontaneous and exothermic in nature, with DH values of -140.03 and -25.01 kJ/mol-1 recorded for BCG removal by MIP and NIP, respectively. The styrene-based MIP showed good mechanical stability, and retained up to about 99% of its adsorption capacity after six sequential cycles of regeneration. Comparatively, the MIP (99.81mg g-1 ) performed considerably better than its NIP (59.00 mg g-1 ) analogue in the removal of BCG from aqueous medium, thus affirming the potentials of the molecular imprinting technique in the production of efficient adsorbents for adsorption of toxic dyes from industrial effluents.

show abstract

Section: Isothermal Modeling Of Bcg Removalmentioning

confidence: 90%