Papers by Wilson L A M A Y I Danbature
Fudma Journal of Sciences, Jan 31, 2024
Magnetic cobalt nanoparticles have many applications, including magnetic drug targets, catalysis.... more Magnetic cobalt nanoparticles have many applications, including magnetic drug targets, catalysis. This paper focuses on synthesis, characterization and study of magnetic cobalt (Co3O4) nanoparticle's catalytic properties in the decomposition of hydrogen peroxide as well as order of the reaction. In this study, magnetic cobalt Co3O4 nanoparticles was synthesized using co-precipitation method. FT-IR spectrum of Co3O4 nanoparticles showed significant absorption peaks at 564.96 cm-1 , 662.83 cm-1 , 2923.98 cm-1 and ~3532 cm-1 /~3413.61 cm-1 corresponding to CoO stretching vibration mode, bridging vibration of O-CoO bond which indicates the presence of crystalline Co3O4,-CH3 stretching vibrations and-OH stretching and bending modes of water respectively absorbed by the sample. The UV-Visible absorption spectroscopy showed an absorption peak at about 300 nm. XRD patterns of the prepared Co3O4 nanoparticles revealed that it was amorphous. The XRD of the calcined Co3O4 nanoparticle showed that cobalt oxide has cubic phase structure. The peak positions (2θ = 18.89°, 31.21°, 36.81° 38.40°, 44.79°, 49.10° and 55.65° which are associated with the plane 111, 220 ,311, 222 400, 330 and 422. The average crystallite size of Co3O4 was determined using Debye-Scherer relation. The crystallite size of Co3O4 was found to be 37.1 nm. The decomposition of hydrogen peroxide was studied using Co3O4 catalyst at room temperature using gasometric technique. It was observed that as the concentration of catalyst increase more oxygen gas was generated during the reaction. Decomposition of H2O2 showed that prepared Co3O4 nanoparticles could be used as suitable catalysts for decomposition of hydrogen peroxide in industries, research institutes.
Asian journal of chemical sciences, Apr 8, 2024
In this Study, low-cost activated carbon impregnated with TiO2 (Ac/ TiO2) was prepared from mahog... more In this Study, low-cost activated carbon impregnated with TiO2 (Ac/ TiO2) was prepared from mahogany fruit shell (Khaya senegalensis) by chemical activation using phosphoric acid, H3PO4. The resulting product was evaluated for the removal of Arsenic and Cadmium ions from aqueous solutions. The prepared activated carbon was characterized using SEM, FTIR and XRD. Operational parameters such as initial concentration, adsorbent dose, contact time, effects of pH and temperature were studied in a batch system. It was found that the percentage removal for arsenic and cadmium were around 98 and 97% respectively. Equilibrium of the adsorption Original Research Article
Adsorption of Phenol from Wastewater using Copper Oxide Supported on Activated Carbon Obtained from Coal: Thermodynamics and Kinetics Studies
Chemical Science and Engineering Research
Journal of Chemical Society of Nigeria
Pesticide residues in beans circulating as food commodities in the national markets have been cha... more Pesticide residues in beans circulating as food commodities in the national markets have been characterized as an environmental hazard due to its persistence and toxicity to both wildlife and humans. Researchers have to enact tactful methods to minimize their harmful residues effects in food in order to protect the consumers. This study investigated the pesticides residues concentrations of Polychlorinated Biphenyl (PCB) components in beans in relation to their recommended values using GC- MS analysis. The results showed that three different samples B2, B3, and B4 contained pesticide residue concentrations within the maximum recommended levels (MRLs) of 0.01 mg/kg to 0.2 mg/kg, while two samples B1 and B5 showed concentrations of pesticide residue beyond maximum recommended residue levels exhibited by 2,2’,4,5,5’,-Pentachlorobiphenyl showed concentration of 1.17518 ppm, and 2,2',3,4',5,5',6-Heptachlorobiphenyl showed concentrations of 0.4599 ppm respectively. Moreover, t...
World Journal of Innovative Research, 2020
Fe(II), Mn(II), Zn(II), Co(II) and Cu(II) complexes of Schiff base were synthesized and character... more Fe(II), Mn(II), Zn(II), Co(II) and Cu(II) complexes of Schiff base were synthesized and characterized by different physico-chemical techniques. The metal (II) complexes were characterized by solubility testing, melting point, molar conductance, UV-Vis and FTIR spectral studies. The high melting point of the complexes showed stability of the metal complexes. The values of molar conductance of the Schiff base, and all the metal (II) complexes are in the range of 3.0-36.6 S.cm2 mol-1. These values indicate that they are all non-electrolytes. The UV-Vis spectral studies have shown hypochromic shift in the metal (II) complexes of the Schiff base. The FT-IR spectral have shown that the Fe(II), Mn(II), Zn(II), Co(II) and Cu(II) ions coordinated to the Schiff base through the v(C=N) at 1618 cm-1. The v(OH) of the Schiff base at 3469 cm-1 disappeared in the metal(II) complexes showing the deprotonation and binding of the hydroxyl oxygen to the metal atom. The ability of these metal(II) complexes to inhibit the growth of disease causing organisms such as Staphylococcus aureus (Gram positive bacteria), E.coli, Klesiella pneumonia, Salmonella typhi (Gram negative bacteria) and Aspergillus niger and Candida albicans (Fungi isolates) were compared with the standard drugs (erythromycin and fungusol) respectively. The results of antimicrobial activity have revealed that most of the complexes are more potent against the isolated microbes as compared to the standard drugs.
Online journal of chemistry, Sep 30, 2021
In this paper, we have reported the synthesis of Au NPs-reduced graphene oxide (rGO) composites u... more In this paper, we have reported the synthesis of Au NPs-reduced graphene oxide (rGO) composites under microwave irradiation using ascorbic acid as eco-friendly reducing agent. The formation of Au NPs-rGO composites was confirmed by UV/Visible spectroscopy, DRIFT spectroscopy, TGA, XRD analysis, SAXS and HRTEM. HRTEM analysis results show that the particle size of the Au NPs formed on rGO nanosheets were in the range of 2-20 nm which is also supported by SAXS analysis results. The synthesized Au NPs-rGO composites were successfully utilized for the aerobic oxidation of benzyl alcohols to their corresponding aldehydes.
Preparation, Characterization and Antimicrobial Activity of Bentonite Clay Obtained from Sabon Kaura Deposit in Pindiga, Gombe State, Nigeria
Chemical Science and Engineering Research
Antifungal Activity of Nano Silver against Candida Albicans and Aspergillus Niger
Chemical Science and Engineering Research
Ag/Ni Bimetallic Nanoparticles: Eco-friendly Synthesis, Characterization and its Bacteriocidal Applications
Jewel Journal of Medical Sciences, Jun 1, 2020
Bayero Journal of Pure and Applied Sciences, 2017
Azanza garkeana (Goron tula) is a valuable edible indigenous fruit tree species confined to Tula ... more Azanza garkeana (Goron tula) is a valuable edible indigenous fruit tree species confined to Tula in Kaltungo Local Government Area of Gombe State. The fruit has rough and hairy bark it is grayish brown in colour, fibrous with longitudinal fissures and brown to yellow slash, young Branchlets stellatetomentose becoming glabrescent when mature. The fruit is 2.5-4cm in diameter, clearly divided into 5 segments, the fleshy gummy pulp which is generally eaten are a good source of proteins, minerals, fibre, vitamins, and contains five seeds inside with a seed in each segment. The seed is hemispherical in shape, up to 10mm long, 7mm thick with brownish and woolly floss. The phytochemical composition of Azanza garckeana seed revealed (0.22%) Tannin, (1.72%) Saponin, (3.70%) Alkaloids, (1.00%) Flavonoids, (2.60%) Phenols, (0.33ug/g) Cyanogenic glucosides, and (3.40%) Carotenoids.
Journal of Chemical Society of Nigeria
In this work, Moringa oleifera root extract was used as the reducing agent in the reaction with A... more In this work, Moringa oleifera root extract was used as the reducing agent in the reaction with AgNO3 leading to the formation of Ag NPs. The formation of the silver nanoparticles was indicated by a visual color changed. The synthesized nanoparticles were characterized using UV-Visible Spectrophotometer, Fourier Transformation Infrared (FT-IR), Scanning Electron Microscope (SEM), X-ray Diffractometer (XRD) and Energy-Dispersive X-ray (EDX) Spectroscopic Techniques. Agar Well method was used in the antibacterial bioassay against two gram positive and two-gram negative bacteria. Optical measurements using UV-Visible Spectrophotometer reveal the maximum absorption wavelength at 400 nm. The Fourier Transform Infrared Spectrophotometer confirmed the stabilization and capping process by the appearance of some peaks formally absent in the root extract spectra. EDX confirmed the presence of elemental silver. Investigations using SEM and XRD revealed that the NPs have crystalline shapes. The...
Molecules
Presently, the rising concerns about the fossil fuel crisis and ecological deterioration have gre... more Presently, the rising concerns about the fossil fuel crisis and ecological deterioration have greatly affected the world economy and hence have attracted attention to the utilization of renewable energies. Among the renewable energy being developed, supercapacitors hold great promise in broad applications such as electric vehicles. Presently, the main challenge facing supercapacitors is the amount of energy stored. This, however, does not satisfy the increasing demand for higher energy storage devices, and therefore, intensive research is being undertaken to overcome the challenges of low energy density. The purpose of this review is to report on solid polymer electrolytes (SPEs) based on polyvinyl alcohol (PVA). The review discussed the PVA as a host polymer in SPEs followed by a discussion on the influence of conducting salts. The formation of SPEs as well as the ion transport mechanism in PVA SPEs were discussed. The application and development of PVA-based polymer electrolytes o...
article, 2021
Magnetic iron nanoparticles (Fe3O4) were synthesized and characterized using Fourier Transformed ... more Magnetic iron nanoparticles (Fe3O4) were synthesized and characterized using Fourier Transformed Infrared ((FT-IR), UV-Visible spectrophotometer, Scanned Electron Microscopy (SEM) equipped with an Energy Dispersive X-ray spectrometer (EDX), and X-ray Diffraction (XRD). The synthesized nano catalyst was used in the transesterification of mahogany seed oil with methanol. The optimized reaction conditions gave a reaction yield of 88% at a catalyst concentration of 1.5% wt., a volume ratio of methanol to oil of 5:1, a reaction temperature of 60 °C, and a reaction time of 120 minutes. The Fe3O4 nanoparticles was regenerated from the mixture and reused for various circles by applying the optimum conditions obtained during the present study. The results showed that the biodiesel yield decreased by increasing the number of cycles when the regenerated catalyst was used. However, good conversion (81.9%) was obtained up to the 5th cycles. The elemental analysis of the synthesized magnetic iron nanoparticles Fe3O4) revealed the highest proportion of iron with 64.37 and 74.40% for atomic and weight concentration respectively, followed by oxygen with 34.27 and 24.50% for atomic and weight concentrations respectively. It could be concluded that the synthesized nano catalyst would serve as an excellent catalyst for the transesterification of vegetable oils.
Characterization of Pauli Error Models
Bulletin of the American Physical Society, 2018
THERMODYNAMICS AND KINETICS ADSORPTION OF PHENOL RED ON CARBON-CuO NANOCOMPOSITE
The Carbon-CuO nanocomposite was synthesized and characterized using UV-Visible spectroscopy, sca... more The Carbon-CuO nanocomposite was synthesized and characterized using UV-Visible spectroscopy, scanning electron microscopy (SEM) and Fourier transformed Infrared Spectroscopy (FTIR). The nanocomposite was used as nanoadsorbent for adsorption of phenol red at the wavelength of 270 nm using UV-Visible spectrophotometer (model 6705). The effect of various parameters such as adsorbent dose, contact time, initial concentration, temperature and pH were evaluated. Carbon-CuO nanocomposite as nanoadsorbent removed 99.98% of phenol red at optimum conditions of adsorbent dose; 0.2, contact time; 40 min, initial concentration; 40 mg/L, temperature; 343K (70°C) and pH; 7. The experimental data was best fitted by the pseudo second order kinetic with R2 =0.979 than the pseudo first order with R2 =0.166. The free energy values for adsorption of phenol red on Carbon-CuO nanocomposite at various temperatures; 303, 313, 323,333, and 343 were found to be -16998.08, -17988.224, -18978.484, -19968.744, ...
Natural nanomaterial; Montmorillonite Clay was collected and purified and then applied in the rem... more Natural nanomaterial; Montmorillonite Clay was collected and purified and then applied in the removal of Fluoride. The Montmorillonite Clay was grounded and 150g was weighed and refluxed in 500mL 1MHCl at 1200C for one hour thirty minutes and activated Montmorillonite Clay was obtained. Flouride was determined with the aid of SPADNS Reagent (2-parasulfophenylazo)-1,8-dihydroxy-3,6-naphthalene disulfanate) using UV/Visible spectrophotometer (Model JENWAY 6300) at the wavelength of 570 nm. Adsorption parameters studied were; adsorbent dose, contact time and pH effect. Fluoride was removed with a maximum percentage of 83.5% at optimum pH of 2 with contact time of 50 minutes and adsorbent dose of 2.0 g as well as temperature of 25oC. Two most used kinetic models were employed in this research which are Pseudo-first and Pseudo-second order. The experimental data was found follow Pseud-second kinetic than Pseudo-first order. Thus, Montmorillonite clay as a natural nanoadsorbent could be u...
In this study, the locally available materials which include; montmorillonite clay and rice husks... more In this study, the locally available materials which include; montmorillonite clay and rice husks were used to synthesize montmorillonite-silica nanocomposite as adsorbent in removal of lead from aqueous solution. Fourier transform infra-red (FTIR), was used to characterize the adsorbent. Batch method of adsorption was employed in the study and parameters that influence the adsorption such as adsorbent dose, initial concentration and contact time have been studied. The optimum conditions of the study were found at the initial concentration 500 mg/L, adsorbent dosage (0.3g), contact time 40 (minutes) and constant stirring at 200 rpm. The experiments were carried out at the natural pH 5 ± 0.3 of the solution and room temperature (309 K). The results showed the maximum percentage of lead removal to be 99.99%. The equilibrium data for the adsorption was analyzed using both Langmuir and Freundlich isotherms models with R 2 =0.9375 and R 2 =0.9275 respectively and both fitted the experime...
Food safety remains an increasingly important public health issue due to increasing microbial foo... more Food safety remains an increasingly important public health issue due to increasing microbial food poisoning. This study focused on the Hydrodistillation extraction of essential oil from Afrostyrax lepidophyllus bark and determination of its biological activities as an antifungal agent. Essential oil was extracted from the bark of Afrostyrax lepidophyllus by hydrodistillation method. The GC-MS analysis showed that seven volatile compounds were identified Viz; Dimethyl trisulfide (2.80%), Disulfide, methyl (methylthio) methyl (23.32%), 2,4-dithiapentane Bis(methyl thio)methane (13.40%), Methane (methylsulfinyl) methyl thio (36.04%), Methylthiosulfide Tris (methylthio) methane (4.43%), Tetradecanoic acid (2.75%), 9,12-octadecadien-1-ol (17.26%). The test of fungicidal activity of essential oil extracted from Afrostyrax lepidophyllus bark revealed that the essential oil showed good inhibitory activity against mucor and could be recommended for industrial application as an antifugal age...
Assesment of Larvicidal Activities of Essential Oil Extracted from Country Onion ( Afrostyrax lepidophyllus ) Seed on Anopheles Mosquito Larvae
Mosquitoes particularly anopheles are the main vectors for the malaria parasites that causes mala... more Mosquitoes particularly anopheles are the main vectors for the malaria parasites that causes malaria fever diseases which is the highest killer of human beings in the tropics. There has been exploration of various methods over the centuries to control mosquito borne diseases. Larvicidal activities of essential oil extracted from country onion ( Afrostyrax lepidophyllus ) seed, on anopheles mosquito larvae has been determined in this study. Essential oils were extracted from Afrostyrax lepidophyllus seed by Hydrodistillation method, with a percentage yield of 4.12% and characterized using gas chromatography-mass spectrometry (GC-MS). Eighteen (18) compounds were identified to be Methanamine (1.07%), Dimethyl trisulfide (16.7%), Furan (0.79%), 1,2-Benzenediol (1.53), Disulfide (52.3%), 1,2,4 trithiolane (0.40%), 2,4-dimethyl-3-nitrobicyclo [3.2.1] (2.85%), 2-pyridinemethanamine (0.66%), Bis (2sulfhydrylethyl (16.7%), Benzenemethanol (0.28%), 2,2-dimethylpropanoic acid (0.50%),1,2 bis ...
Journal of Natural Sciences Research, 2013
Baobab ( Adansonia digitata ) seed oil was extracted using the soxhlet extractor in n-hexane at 6... more Baobab ( Adansonia digitata ) seed oil was extracted using the soxhlet extractor in n-hexane at 60 o C and some of its physical parameters determined. The oil was biodegraded using a Fungi (Aspergillus niger) between 25-30 o C for 49 days. The pH and viscosity of the oil were measured as incubation period progressed. The result revealed a gradual decrease in pH but an increase in viscosity of the oil as the incubation time increases. It was opined that the decrease in pH could be due to the secretion of enzymes, and the subsequent breaking down of the substrates into smaller acidic molecules whereas, the increase in Viscosity could have been due to the assimilation of these molecules by the microorganisms which may have led to their growth and or increase in the population and the formation of long chain metabolites. The Fourier Transform Infrared determined showed shifts in the absorption bands of the functional groups such as carbonyl, hydroxyl, carboxylic and amide of the biodegr...
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Papers by Wilson L A M A Y I Danbature