Browsing by Author "Kovo, A.S."
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Item Response Surface Optimisation of the Adsorption of Cu (II) from Aqueous Solution by Crab Shell Chitosan(3rd international engineering conference, Minna, Nigeria, 2019-09-11) Babatunde, E.O.; Akolo, S.A.; Ighalo, J.O; Kovo, A.S.Adsorption of Cu (II) from aqueous solution by crab-shell derived chitosan was evaluated and optimised by response surface methodology alongside comparison with commercial chitosan. The commercial and locally developed chitosan was found effective in removal of copper (II) ion from aqueous solution and the results of the copper ion percentage removal was 99.57% for locally produced chitosan and 99.80% for commercial chitosan at pH of 6.0. Optimum metal uptake (99.57%) was observed at pH 4.75, 120 minutes equilibration time and dosage of 2 g/50ml. The monolayer adsorption capacity of the commercial and locally developed chitosan was 1.44 mg/g and 1.49 mg/g respectively. The isotherms modelling indicated that the Langmuir isotherm was the best fit. The kinetics for the adsorption of copper, onto chitosan was best described by a pseudo-second-order kinetic model. It has been shown that chitosan are excellent precursors for the removal of copper from aqueous solution and consequently for its use in remediating polluted industrial effluents.Item Utilisation of Local Kaolin as Catalyst Support in the production of Carbon nanotubes using Catalytic Vapour Deposition method(Nigerian Society of Chemical Engineers (NSChE), 2017) Abdulkareem, A.S.; Suleiman, B.; Kariim, I.; Onimisi, I.; Kovo, A.S.; Mohammed, I.A.The work focused on the use of kaolin as support material for the development of Fe/Kaolin monometallic catalyst for multi-walled carbon nanotubes synthesis (MWCNTs) in catalytic vapour deposition equipment. The influence of process parameters such as drying temperature, drying time, stirring speed and mass of support on the percentage yield of monometallic Fe/Kaolin catalyst using wet impregnation method was further reported using a factorial experimental approach. The optimum yield of 79.40% was obtained at a drying temperature of 120°C, drying time of 5 hours, stirring speed of 700 rpm, and 9 g mass of support during the optimization of the process parameters. The highest yield catalyst was then characterized for surface area, morphology, functional group, and crystallinity using BET, SEM/EDX, FTIR and XRD respectively. The well characterized catalyst was further used for the synthesis of MWCNTs in a CVD reactor and the effect of acetylene flow rate on the MWCNTs yield was recorded. It was found that the flow rate of acetylene was directly proportional to the MWCNTs yield. The synthesized MWCNTs possessed excellent morphology and surface area. Hence, the applied kaolin support showed high proficiency for possible application as catalyst support for synthesis of good quality MWCNTs in a CVD reactor.