ABSTRACT In this study, hydrodesulphurization (HDS), hydrodenitrogenation (HDN), hydrodemetallization (HDM), and micro carbon residue (MCR) renoval were investigated using residuum hydrocracking catalysts containing a zeolite component. It to well known that the strong Brønsted acid sites on the external surfaces of zeolite crystals increase the distillate yield and decrease the coke yield obtained when using fluid catalytic cracking (FCC) catalysts. However, comparatively few studies have b...
ABSTRACT Oilseed sunflower is one of the major vegetable oil sources. The residue after the extraction of oil (defatted meal, DM) contains a substantial amount of nutritious protein which is recoverable by extraction and precipitation methods. For effective recovery of the solid proteins from the solids-liquid suspension, it is imperative to have large particles with a narrow spread in their size distribution and high solids concentration. In this research, up to 97 % w/w and 65 % w/w of the...
ABSTRACT The increasing demand for silver nanoparticles has led to the need for new superior methods of synthesis to be developed. In this study, the Allium Ascalonicum plant was used in the plant-mediated synthesis of silver nanoparticles. The phytochemicals of the plant were extracted using seven different solvents with a range of polarities and the methanol/water 50/50 solvent had the highest extraction yield of 63 %. The phytochemical tests showed that the plant is rich in phytochemicals ...
ABSTRACT A green approach was used in the synthesis of silver nanoparticles which is an easy, cheap, eco-friendly and a fast method in achieving stable silver nanoparticles over a long period of time. Plant leaves extract from Parinari Curatellifolia and Vangueria Infausta were used in the synthesis after optimizing different parameters (temperature, silver nitrate concentration and amount of extract. The optimum conditions achieved for the synthesis of silver nanoparticles (AgNPs) using Pari...
ABSTRACT Biological and antioxidant activities of Dicoma anomala, Kigelia pinnata, Pseudolachnostylis maprounelifolia and Flacourtia indica are reported. The medicinal plant extracts of different polarities were prepared and tested for antimicrobial activity using the disc diffusion method. The acetone crude extracts showed the highest activity as compared to the chloroform and petroleum ether extracts. The qualitative analysis of the extracts showed presence of tannins, saponins, phenolics, ...
ABSTRACT A comparative analysis of the efficiency of activated carbon produced from Berchemia discolour seed shells derived activated carbon (BDSAC) and commercial grade activated carbon (Haycarb Carbon) was utilized in the adsorption of gold (iii) chloride from acidic medium. The adsorption process of BDSAC was best described by the Freundlich, Halsey, Dubinin Radushkevich (D R), Temkin isotherms and Langmuir isotherm had RL values in the range 0 < RL < 1 hence the adsorption process was fav...
ABSTRACT Ascorbic acid and dopamine are biomolecules found in humans. They both have important functions in the body and cause numerous side effects at high concentrations. An electrochemical sensor based on nickel( II) tetra amino phthalocyanine conjugated to iron oxide doped graphene oxide nanosheets was developed.FTIR,UV- vis, cyclic voltammetry ( CV) and electrochemical impedence spectroscopy (EIS) were used for characterisation of electrode modifiers.FTIR was used to ascertain that a che...
ABSTRACT This research is based on the modification of a glassy carbon electrode with cobalt (II) tetra carboxy phthalocyanine and nitrogen doped graphene oxide nanosheets composite (CoTCPc/N-GONS) was used for the electrocatalytic oxidation of nitrites. The synthesised cobalt (II) tetra carboxy phthalocyanine (CoTCPc) and nitrogen doped graphene oxide nanosheets (N-GONS) were characterized by FTIR spectroscopy, UV-Vis spectroscopy, electrochemical impedance and cyclic voltammetry. The electr...
ABSTRACT The biodesulfurization of diesel and kerosene was investigated. Soil samples were taken at various points of the Ijora petroleum products haulage terminal, in Lagos, Nigeria. Microorganisms capable of selectively abstracting sulfur from diesel and kerosene without reducing their fuel values were isolated by using a sulfur-reducing selective medium. The choice of the sulfur selective reductive pathway is informed by the fact that it is sulfur specific and so the calorific value is ma...
ABSTRACT High concentrations of methylene blue (MB) in aqueous environments have detrimental effects to both plants and animals and hence its removal is very important. Metal-Organic Framework, HKUST-1 and composite, CuO@HKUST-1, were synthesized and characterised for their functional groups before and after degradation of methylene blue. Studies were done to optimize the degradation of methylene blue and to characterize the degradation system with respect to photocatalytic degradation kinet...
ABSTRACT The investigation of nitrate adsorption onto Brachystegia spiciformis leaf powder from waste waters was performed. Characterization for the functional groups of the biomass before and after nitrate sorption as well as after desorption was done using an FTIR spectrophotometer. The effect of pH, contact time, dosage and initial nitrate concentration was investigated. The Brachystegia spiciformis leaf powder had amine, carboxylic and hydroxyl groups that were involved in nitrate remova...
ABSTRACT The activity of indigenous microbial system is a required tool to remediate an environment that has been contaminated by hydrocarbons. This work deals with the dynamic response to crude oil contaminants of undefined microbial systems in three selected communities of the Rivers State of Nigeria. The activities of indigenous (undefined) consortia were studied and compared using Respiratory technique. The soil samples were incubated with 2 % ( 𝑣⁄𝑣)crude oil in mineral salt medi...
ABSTRACT This dissertation investigated the substitution of Kaolin with Coal Fly Ash (CFA) as raw material for the manufacture of cement. The research sought to establish the optimum quantity of CFA, Sand and Limestone required to produce a cement that had improved early day strength and latter strengths of cement due to substitution of kaolin with CFA. This was a novel and creative research where a total of twenty experiments formulated from the central composite design were carried out to ...
ABSTRACT The most pertinent problem which must be solved in the design of multicomponent distillation process is the evaluation of the vapour-liquid equilibrium (VLE) ratio and enthalpy (liquid and vapour) values of each component in each of the stages. Good experimental data are not easily obtained but require considerable experimental skill, experience and patience. It is therefore of economical necessity to consider techniques for estimating vapour-liquid equilibrium and enthalpies data fo...
ABSTRACT In this study, the use of purely inorganic filler materials to influence the mechanical properties of flexible polyurethane foam has been investigated. The fillers were calcite (CaCO3), dolomite (CaMg(CO))), and kaolin (ALSO(OH)) of volume fractions ranging from 0 - 40 wt%. Each of the filler content ranges was investigated at the following average particle size distributions: 0.06, 0.5, 3.5, 10, 20, and 841 um. The experiment was performed in a discontinuous foaming process based on...