Abstract

Lignified isolate was successfully synthesized from simulated effluent of modified procedure for bio – ethanol production from elephant grass. The effectiveness of lignin isolate (EA); complexed with Al3+ (Al –EA) and Mn2+ (Mn – EA) for adsorbing aqueous crystal violet dye (CVD) was evaluated. The adsorbents were characterized using Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). Removal efficiencies of Al k EA (98.42%) and Mn – EA (97.87%) were obtained at contact time of 30 min and 343 K. Kinetic study showed that Brouer – Weron – Sotolongo, Fractal – like mixed 1,2–order and Elovich models were the best three models in describing the adsorption kinetics of both adsorbent. Similarly, the predicted kinetic data were adjured statistically significant using F- test and student’s t-test. Application of mechanistic models suggests film diffusion as the rate controlling mechanism. The estimated average thermodynamic parameters (ΔG0 (−18.438 KJ/mol), ΔH0 (+27.968 KJ/mol) and ΔS0 (29.536 KJ/mol)) reveal that CVD adsorption onto Al – EA and Mn – EA was feasible, spontaneous and endothermic.

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