Chemistry Research Papers/Topics

Photophysical Properties Of Some Hetero-Aromatic And Carbonyl Compounds

ABSTRACT A large number of hetero-aromatic and carbonyl molecules are useful in pharmaceutical and dye industries. Studies of their transition dipole moment (Δμ) and transition polarizability (Δα) are important because they determine their solubility and usefulness. Experimental determination of these parameters and other electronic properties such as oscillator strength (f) using Solvatochromic Shift Equations (SSE) has proved to be unreliable. This is due to the large spread in their re...

Synthesis And Computational Studies Of 1-4-Η- Cyclohexa-1,3-Diene Derivatives Of Irontricarbonyl Complexes

ABSTRACT Metal complexes have interesting properties and varied applications in light emitting diodes. A number of substituted pyridine metal (Rhenium, Ruthenium and Iridium) complexes have been synthesised and characterised. However, the synthesis and characterisation of substituted pyridine iron complexes such as Tricarbonyl (1-4-η- pyridino-cyclohexa-1,3-diene) iron complexes for its light emitting property remain scanty. Therefore, this research was designed to synthesise, characterise a...

Physicochemical Characteristics And Amenability To Bench Scale Treatments Of Some Industrial Effluents And Sediments In Lagos Metropolis

ABSTRACT Untreated industrial effluents discharged into land and surface water are of great environmental concern. Previous studies on physicochemical characteristics of effluents and sediments from discharged points of various industrial sectors in Lagos metropolis are inadequate in scope, duration, chemical treatment options and estimated pollutant discharge load which are of importance in waste water management. This study was designed to investigate the physicochemical characteristics of ...

Sorption And Desorption Of Selected Organic And Inorganic Pollutants In Soils Collected From Different Agro-Ecological Zones Of Nigeria

ABSTRACT Environmental pollution caused by persistent and bioaccumulative toxic chemicals is a global issue in view of its effects on biota. Researches abound on the sources and concentration of soil pollutants but there is paucity of information on their sorption/desorption in Nigerian soils. This is necessary for accurate prediction of toxicity and effective remediation strategy. Therefore, this study was aimed at assessing the sorption/desorption of selected organic and inorganic pollutant...

Metal Tetrafluoroborate Complexes Of Some Dicarboxyuc Acid Hydra2i Des

ABSTRACT Eighty-eight divalent metal complexes derived from dihydrazides of oxalic, malonic, succinic, adipic, phthalic and :erephthalic acids, with manganese( 11), cobalt(ll), nickel(ll), copper(IJ), zinc(ll), cadmium(ll), mercury(ll) and magnesium tetrafluoroborates have been prepared. The effect of 1 :1 and 1:2 metal to ligand reactant ratios have been examined. The complexes have been characterized on the basis of their analytical data, magnetic susceptibility, electronic and IR spectral ...

Spatial And Temporal Variations Of Physicochemical Characteristics Of Surfacewater And Sediment Of Osun River In Southwestern Nigeria

ABSTRACT Osun River is important for domestic, recreational and other activities. It flows along a channel that may be polluted by inputs from industrial, agricultural and other anthropogenic activities thereby limiting its normal use for drinking, fishing, recreation and other purposes. Available literature on the river quality is limited in scope, frequency of sampling and duration of studies. Therefore, a study of the river and its tributaries was carried out to determine the spatial and t...

Chemical Analysis and Nutritional Assessment of Defatted Garcinia Mangostana Seeds Used as an Additive on the Feed of Fish(Clarias Gariepinus)

Abstract - Chemical analysis and nutritional assessment of defatted Garcinia mangostana seeds (DGMS) were undertaken to determine its suitability as an additive at 0.00g, 18.00g, 36.00g, 54.00g and 72.00g inclusion levels in diets and performance of Clarias gariepinus post juveniles. Proximate analysis of DGMS showed that the defatted seeds were high in carbohydrate (71.00 ± 0.79%) but low in protein content (8.10 ± 0.22%). The mineral element analysis detected different minerals with potas...

Starch And Cyclodextrin Based Adsorbents For Removal And Preconcentration Of Polycyclic Aromatic Hydrocarbons And Phthalates In Water

ABSTRACT The release of Polycyclic Aromatic Hydrocarbons (PAHs) and phthalates from anthropogenic sources into the aquatic environment is of public health concern. The C18 bonded silica and styrene-divinyl-benzene polymer adsorbents which are used for preconcentration and remediation of PAHs and phthalates polluted water are expensive and non-biodegradable. Hence, there is need to source for alternative adsorbents. Starch and cyclodextrin based polymers have been reported to be cheap and biod...

Heavy Metal Burden Of Soils And Their Accumulation Potentials In Some Food Crops Of Selected Farms In Kogi State, Nigeria

ABSTRACT Heavy metal contamination in soil may be reflected in food crops due to plant uptake and such crops when consumed may cause adverse health effects. The assessment of toxic metal burden of soils and the capacity of food crops to accumulate these metals are essential. Such studies have not been reported in literature for Kogi State, a state noted for intense agricultural activity. The aim of this study was to determine heavy metals in soils, food crops, irrigation waters and sediments ...

Antibacterial Activities Of Silver-Nanoparticles-Titania Composite Thin Films Fabricated By The Molecular Precursor Method (MPM)

ABSTRACT Titanium Oxide (TiO2) as a photocatalyst produces free radicals upon receiving light energy; thus, it possesses antibacterial properties. The antibacterial property of silvernanoparticles-doped TiO2 photocatalysts (Ag-NPs/TiO2) could be further enhanced by visible light illumination, which also widens its practical applications. However, the major limitation of this Ag-NPs/TiO2 composite material is its poor miscibility, which subsequently reduces the antibacterial activities of the...

Photo-Electrical Conversion Efficiency Of Dye Sensitized Solar Cells Prepared From Mopane Leaf Chlorophyll Extract

ABSTRACT In times of fossil fuel shortage, increasing crude oil prices, as well as rejection of conventional energy sources (e.g. coal or nuclear power plants), sustainable energy forms become more and more the focus of attention. One of several offered solutions is to develop a photovoltaic device (solar cells), since solar energy is abundant. Especially, Namibia receives solar radiation of 5.8 to 6.4 KWh per square meter per day – one of the highest in the world. With 8 to 11 average hou...

An Investigation Of The Effect Of Elemental Composition And Gold Grain Size On Gold Analysis And Recovery At Otjikoto Gold Mine

Abstract Gold extraction from different type of ores is largely driven by elemental compositions and gold particle size and distribution. Another major factor that contribute to inaccurate gold analysis/ estimation is the nugget effect (presence of gold particulates in different sizes and shapes). Therefore the purpose of the study was to quantify and evaluate the effect of different elements on gold extraction/analysis, establish gold particle size distribution and determine the most suitab...

Effect Of Silver Doping On The Optical And Photocatalytic Properties Of Zinc Oxide Thin Films

Abstract To study the optical and photocatalytic properties of zinc oxide (ZnO or zincite), thin films doped with metallic silver-nanoparticles (Ag-NPs), with various amounts of Ag (20 mol% ≤ n ≤ 80 mol%), were fabricated on a quartz glass substrate at 600°C in air using the molecular precursor method (MPM). The fabricated thin films were analysed and X-ray diffraction (XRD) patterns of Ag nanoparticles, zinc oxide, and composite AgNP/ZnO films were measured using an X-ray diffractomete...

Magnetic Nanoparticles Modified With Moringa Seed Proteins For Water Treatment And Recovery Of Precious Metal Ions

ABSTRACT Access to clean and safe water for everyday use is needed for a healthy society. Water treatment and recovery of precious metals is a serious challenge particularly for developing countries since the current technologies are not attractive because they are often expensive and not environmentally friendly. Precious metals such as gold, palladium, and platinum are valuable and hence crucial for any economy. Coagulants used in the treatment and recovery of precious metals have setbacks...

Anticancer, Antioxidant And Antimicrobial Screening Of Extracts From Ziziphus Mucronata, Heliotropium Ciliatum And Gnidia Polycephala From The Oshikoto Region Of Namibia

ABSTRACT Plants have long been used to treat ailments such as headaches, stomach-ache, diarrhoea, tumours, wounds and sexually transmitted diseases, just to mention a few. Ziziphus mucronata, Heliotropium ciliatum and Gnidia polycephala are traditionally used to treat tumours and wound-related illnesses. Tumours and persistent wounds can be a sign of cancer. Microbial wound infections can also bring fatal consequences if unattended. This study evaluates the antioxidant, anticancer and antimi...


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