Browsing by Author "Olasehinde, E.F."
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Item Corrosion Inhibition Behaviour for Mild Steel by Extracts of Musa sapientum Peels in HCl Solution: Kinetics and Thermodynamics Study(IOSR Journal of Applied Chemistry, 2012-11-01) Olasehinde, E.F.; Adesina, A. S.; Fehintola, E. O.; Badmus, B. M.; Aderibigbe, A. D.The inhibition of the corrosion of mild steel by acid extract of Musa sapientum peels in 1M HCl was investigated using weight loss method. The results showed that the corrosion rate of mild steel in 1M HCl decreases with increase in concentration of the extracts and the values were in the range 0.013021 - 0.002127 ghr-1 cm-2 . The inhibition efficiency increases progressively as the concentration of the extracts increases up to about 4% (v/v), above which, further increase in extract concentration did not cause any significant change in the inhibition efficiency. Effects of temperature on the inhibition efficiency of the extracts showed that inhibition efficiency decreases with increase in temperature. Activation energy (Ea) was found to be 61.60 Kjmol-1 for 1M HCl and increases to 66.72Kjmol-1 in the presence of Musa sapientum extract. The values for enthalpy of activation and entropy were all positive indicating the endothermic nature of the mild steel dissolution process. Calculated Gibbs free energy was in the range -9.43 to -8.99KJ. Kinetics of the reaction in the presence of the extracts revealed that it follows a first order reaction and the half-life increases as the concentration of the extracts increases suggesting that inhibition efficiency increases with increase in the concentration of the extracts. Preliminary investigation of the phytochemical constituents showed that Musa sapientumcontains tannin, flavonoid, terpenoid and some other compounds in trace constituents.Item Investigation of Lead Binding by Tithonia diversifolia(Science Alert, 2007-01-05) Okoronkwo, A.E.; Olasehinde, E.F.Mexican swillower (Tithonia diversifolia) had been chosen for metal binding studies as a prelude to finding economic use for it. Adsorption capacity, pH-profile and time-dependency studies were conducted using stem biomass of this plant. Results of the investigation showed that over 96% of the lead content of water were adsorbed even in the first 5 min of interaction. Optimum pH of adsorption was recorded as 5 for the metal while the kinetic study conducted showed that the adsorption process follows a pseudo-second order reaction. In order to llllderstand the effect of NaOH modification on the Tithonia diversifolia, batch modification studies were conducted. Results of this modification studies show enhanced metal binding activity. Presence of cations such as calcium and magnesium also interfered with the adsorption process. The adsorption isotherm was apparently Langmuir in nature.Item Investigation of the Inhibitive Properties of Alchornea laxiflora leaves on the Corrosion of Mild Steel in HCl: Thermodynamics and Kinetic Study(Journal of American Science, 2015-09-01) Olasehinde, E.F.; Ogunjobi, J. K.; Akinlosotu, O. M.; Omogbehin, S. AThe use of naturally occurring compounds as corrosion inhibitors is of potential interest because of their cost effectiveness, abundant availability and environmental acceptability. Therefore, the study investigates the inhibition efficacy of acid extract of Alchornea laxiflora leaves on mild steel in acidic medium using gravimetric method. Experiments were performed by varying the immersion time, concentration of extract and the temperature. The results showed that acid extract of Alchornea laxiflora leaves is a potential inhibitor for the corrosion of mild steel in acidic medium. The corrosion rate of mild steel in 1M HCl decreases with increase in the concentration of the extract. The inhibition efficiency increases progressively as the concentration of the extract increases but decreases with rise in temperature and the exposure time. The highest inhibition efficiency observed in the presence of the extract was 96 %. Activation energy was found to be 21.81 kJ mol-1 for the blank and increases to 82.57 kJ mol-1 in the presence of the extract. Thermodynamic parameters such as enthalpy change, entropy change and Gibb’s free energy were evaluated. Kinetics of the reaction in the presence of the extracts revealed that it follows a first order reaction and the half-lives increase as the concentration of the extract increases. Adsorption studies revealed that Langmuir adsorption isotherm is the best adsorption model applicable to the adsorption of the extract on mild steel surface. Preliminary investigation of the phytochemical consItem Leaching kinetics of lead from galena with acidified hydrogen peroxide and sodium chloride solution(Taylor and Francis Online, 2015-01-19) Adebayo, A.O.; Olasehinde, E.F.The leaching of lead from galena in acidic hydrogen peroxide in presence of sodium chloride solution has been investigated with respect to the effects of hydrochloric acid and hydrogen peroxide concentrations, by changing the stirring speed, leaching temperature and the particle size. It was observed that leaching rate increases with increasing hydrochloric acid concentration, hydrogen peroxide concentration and the temperature. However, it decreases with increase in the particle size. The kinetic study showed that the leaching process is represented by shrinking core model with mixed kinetic. The activation energy (Ea) for the leaching reaction was calculated as 14·60 kJ mol−1, which is suggestive of the mixed controlled kinetics for the leaching reactionItem Quality Assessment Of The Bioethanol Derived From Cassava Peel And Fermented Cassava Starch Liquor(International Journal of Innovative Research and Advanced Studies (IJIRAS), 2016-06-30) Ogunsuyi, H.O.; Orole, T.M.; Olasehinde, E.F.The bioethanol produced from cassava peel (Manihot esculanta cranz) and its applications to industrial processes was investigated. Two modes of hydrolysis were adopted for the liquefaction of the gelatinized sample of the cassava peel: acid and enzyme hydrolysis. 0.1 – 1 M H2SO4 and HCl were used in-turn to hydrolyze the gelatinized sample as well as Alpha-amylase and Gluco-amylase enzymes. Both the acid and enzyme hydrolyzates were subjected to fermentation process using industrial baker’s yeast (Saccaromycescerevisea). For the acid hydrolysis, different experimental conditions such as reaction temperature (100 o c), reaction time (60 min.), and acid concentrations (1.0 M) were examined in order to establish the best conditions for the hydrolysis. The yield of bioethanol obtained using H2SO4 was 20.7 % and noticed to be higher than that of HCl which was 15.62 % under the same experimental conditions. However, the yield of bioethanol obtained via enzyme hydrolysis after fermentation was observed to be 21.62 %, which was higher than the yields obtained from acid hydrolysis. The physicochemical properties of the bioethanol derived from the cassava peel indicated that the flash point of the liquid fuel was 40oC, Refractive index as 1.358 and pH of 5.38 All these values conformed to those of the conventional ethanol which showed values for flash point as 38 oC, Refractive index of 1.360 and pH of 4.68. Functional group of the derived bioethanol shows O-H functional group around 3600- 2400cm-1 , C-H(1470-1350 cm-1 ) and C-O(1320-1000cm-1 ). The viability of the in-house derived-bioethanol for the production of some household products such as aftershave, hand sanitizer and disinfectant was investigated and found suitable as base chemical for the industrial production of these commodities. The quality assessment of these household products showed that cassava derived bioethanol is a promising feedstock for the industrial production of these products and their allied