Michael Horsfall Jnr
University of Port Harcourt
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Featured researches published by Michael Horsfall Jnr.
Electronic Journal of Biotechnology | 2005
Michael Horsfall Jnr; Ayebaemi I. Spiff
This report is based on the investigation of the effect of temperature on the removal of Pb 2+ and Cd 2+ in aqueous effluent using C. bicolor biomass in a batch sorption process. The result showed that the most suitable sorption temperature was 40oC with maximum sorption capacities of 49.02 mg/g and 52.63 mg/g for Pb 2+ and Cd 2+ respectively. Various thermodynamic parameters, such as ΔG o , ΔH o , ΔS o and E a have been calculated. The data showed that the sorption process is spontaneous and exothermic in nature and that lower solution temperatures favours metal ion removal by the biomass. The findings of this investigation suggest that physical sorption plays a role in controlling the sorption rate. The sticking probability model was further employed to assess the applicability of the C. bicolor biomass as an alternative adsorbent for metal ion contaminants in aqueous system.
Electronic Journal of Biotechnology | 2004
Michael Horsfall Jnr; Ayebaemi I. Spiff
Environmental protection requires the use of natural products instead of chemicals to minimize pollution. This investigation studies the use of a non-useful plant material as naturally occurring biosorbents for the removal of cationic pollutants in wastewater. The effect of pH on the sorption of Pb 2+ and Cd 2+ ion onto Caladium bicolor corm biomass was investigated. The experimental results have been analysed in terms of Langmuir, Freundlich and Flory-Huggins isotherms. The data showed that the maximum pH (pH max ) for efficient sorption of Pb 2+ was 7.0 and for Cd 2+ 5.0. Evaluation using Langmuir equation gave the monolayer sorption capacity as 88.50 mg/g and 65.50 mg/g at the respective pH max for Pb 2+ and Cd 2+ . Surface characterization of acid and base treated C. bicolor biomass indicates a physiosorption as the predominant mechanism for the sorption process. The thermodynamic assessment of the metal ion - Caladium bicolor biomass system indicates the feasibility and spontaneous nature of the process.
Electronic Journal of Biotechnology | 2006
Donbebe Wankasi; Michael Horsfall Jnr; Ayabaemi Ibuteme Spiff
The sorption kinetics of Pb 2+ and Cu 2+ ions in aqueous solution by unmodified and mercaptoacetic acid modified biomass of Nypa fruticans shoot has been investigated. The equilibrium sorption capacity of Pb 2+ and Cu 2+ was determined from the Langmuir equation and found to be 15.59 mg/g and 21.85 mg/g for unmodified biomass and 52.86 mg/g and 66.71 mg/g for modified biomass at 30oC. The time dependent studies showed relatively rapid sorption of 5 - 10 min to reach equilibrium for both metal ions. A batch sorption model, based on the assumption of the pseudo-second-order mechanism, was applied to predict the rate constants (g mg -1 min -1 ), which were found to be 3.59 x 10 -4 (Pb 2+ ) and 1.85 x 10 -4 (Cu 2+ ) and 2.82 x 10 -2 (Pb 2+ ) and 3.67 x 10 -2 (Cu 2+ ) on unmodified and mercaptoacetic acid modified biomass respectively. The activation energy of the sorption of Pb 2+ and Cu 2+ on Nypah palm reveals an endothermic process.
Journal of The Chilean Chemical Society | 2005
Donbebe Wankasi; Michael Horsfall Jnr; Ayebaemi I. Spiff
The retention of Pb (II) from aqueous solution by pure (PB) biomass and thioglycolic acid (TGA) modified biomass (MB) of Nipah palm (Nypa fruticans Wurmb) petiole was studied using batch sorption technique. The equilibrium retention capacity of Pb (II) was determined from the Langmuir equation and found to be 15.06 mg g-1 and 17.60 mg g-1 for pure and modified biomass, indicating a small difference in Pb(II) retention after treatment with TGA. The data showed that chemisorption process could be the rate-limiting step in the retention mechanism. Studies on the retention of Pb (II) by Nipah palm petiole biomass are important because it may contribute in aiding the innovative removal and recovery of metal ions from contaminated industrial effluents
Electronic Journal of Biotechnology | 2006
Michael Horsfall Jnr; Fred E. Ogban; Eyetemi E. Akporhonor
The effects of acidic, basic and neutral reagents on the recovery of Pb 2+ and Cd 2+ from metal-loaded biomass of wild cocoyam ( C. bicolor ) were investigated by eluting the biomass in five successive cycles using 0.01 M HCl, 0.1 M HCl, 0.01 M NaOH, 0.1 M NaOH and distilled water at different contact times. The data showed that the ease of metal ion recovery from metal -loaded biomass by the eluent solutions is of the order 0.01 M HCl > 0.1 M HCl > 0.01 M NaOH > 0.1 M NaOH > distilled water. Over 94% Pb 2+ and 74% Cd 2+ of the initially adsorbed metals were recovered by 0.01 M HCl, while < 20% of both metals was recovered by basic reagent. Distilled water recovered less than 9% of both metal ions from the biomass. Macroscopic changes were also observed as the concentration of recovery reagent increased. This study has demonstrated that the selection of a recovery reagent for metal ions on a biomaterial should give consideration to the reusability of the biomass.
Archive | 2005
Michael Horsfall Jnr; Ayebaemi I. Spiff
Bulletin of The Chemical Society of Ethiopia | 2005
Michael Horsfall Jnr; Ayebaemi I. Spiff
Journal of Nepal Chemical Society | 2013
Timi Tarawou; D. Wankasi; Michael Horsfall Jnr
Archive | 2005
Michael Horsfall Jnr; Ayebaemi I. Spiff
Archive | 2005
Michael Horsfall Jnr; Ayebaemi I. Spiff