Browsing by Author "Olawale, Margaret D."
Now showing 1 - 6 of 6
Results Per Page
Sort Options
Item ITACONIC ACID BASED COORDINATION POLYMER: MECHANOCHEMICAL SYNTHESIS, CHARACTERIZATION AND VAPOCHROMIC STUDY(Nigerian Research Journal of Chemical Sciences, 2020-05-30) Olawale, Margaret D.; Obaleye, Joshua A.; Oladele, Ebenezer O.Itaconic acid based coordination polymer (CP) was synthesized through a mechanochemical reaction between itaconic acid ligand and copper (II) salt. The [Cu(Itac)2] CP was characterized by elemental analysis, Infrared spectroscopy, UV-Visible spectrophotometry and powder x-ray diffractometric analysis which confirmed its synthesis. In the application of [Cu(Itac)2], vapochromic behavior was carried out with different solvents vapour. Result revealed methanol having the highest sorption values of 1.44 moles. Also, the adsorption of the solvents vapour on [Cu(Itac)2] increased in the order of methanol > DMF > ethanol > acetone > isopropanol > benzene > toluene. The polarity of the solvents, solvent sizes and the unique affinity of [Cu(Itac)2] CP to some solvents may account for trend observed in rate of solvents uptake. These results indicate that [Cu(Itac)2] could be used to remove unwanted solvent vapour from contaminated air due to their reasonably large surface area.Item Removal of organic pollutant (pyrene) from aqueous solution using coordination polymer of [Cu(Pic)2(H2O)2]·H2O (CP‑1) as adsorbent(Springer, 2019-09-16) Tella, Adedibu C.; Olawale, Margaret D.; Obaleye, Joshua A.; Adimula, Vincent O.; Alimi, Lukman O.; Ajibade, Peter A.Adsorptive removal of organic pollutant (pyrene) was carried out using coordination polymer [Cu(Pic)2(H2O)2]·H2O (CP-1) (where “Pic” represents picolinic acid), which was prepared from copper acetate monohydrate and picolinic acid. The compound was characterized by spectroscopic techniques, SEM, elemental and thermal analyses and X-ray crystallographic analysis. The crystal structure of CP-1 shows a centrosymmetric triclinic space group P-1 in which a = 5.0924 (4) Å, b = 7.5172 (6) Å, c = 9.0965 (8) Å. The Cu2+ ion is seen to have an octahedral geometry, which is bonded to oxygen atoms from the picolinic acid and nitrogen atoms from the pyridine rings. Pyrene adsorption from aqueous media was studied with the prepared adsorbent (CP-1). The kinetic model was observed to be second order, and the sorption data fitted best into the Langmuir model. The absorbent, CP-1, was shown to have a 90.91 mg/g adsorption capacity (maximum) for pyrene in this study at 25 °C. Compound CP-1 can thus be presented as a potential adsorbent in the treatment of pyrene-polluted water.Item Solvothermal synthesis and characterization of novel [Ni(II)(Tpy)(Pydc)]·2H2O metal–organic framework as an adsorbent for the uptake of caffeine drug from aqueous solution†(Royal Society of Chemistry, 2020-10-09) Olawale, Margaret D.; Obaleye, Joshua O.; Oladele, Ebenezer O.The discharge of pharmaceuticals and personal care products effluent after industrial processes with little or without treatment is increasing at an alarming rate. Health risks associated with the discharge of pharmaceuticals and personal care products effluent into the environment cannot be over emphasized. Therefore, there is an urgent need to develop metal–organic framework (MOF) material that can be used to adsorb pharmaceuticals and personal care products before the discharge of waste water into the environment. [Ni(II)(Tpy)(Pydc)]·2H2O MOF was synthesized from the reaction of nickel nitrate, terpyridine (Tpy) and pyridine dicarboxylate (Pydc) via solvothermal method of synthesis. The synthesized MOF was characterized with melting point determination, elemental analysis, hot stage microscope, thermogravimetric analysis, SEM and X-ray crystallography analysis. All results clearly showed the coordination of the nickel(II) ion to the two ligands. In application, [Ni(II)(Tpy)(Pydc)]·2H2O MOF was used for the adsorption of caffeine. The result clearly showed that 98.4 mg of caffeine was adsorbed by 1 g of [Ni(II)(Tpy)(Pydc)]·2H2O MOF at 40 °C, pH of 4 for 1 hour via multiple binding site (Freundlich isotherm). Characterization of the aqueous caffeine solution after adsorption showed a negligible amount of nickel metal when compared with the WHO nickel intake recommendation. [Ni(II)(Tpy)(Pydc)]·2H2O MOF is a potential adsorbent that could be used for the removal of caffeine from aqueous solutions..Item Synthesis and crystal structure of Cd-based metal-organic framework for removal of methyl-orange from aqueous solution(Elsevier, 2017-07-21) Tella, Adedibu C.; Olawale, Margaret D.; Neuburger, Markus; Obaleye, Joshua A.A novel [Cd(INA)2(H2O)]. ISB (1) (INA = isonicotinate; ISB = isobutanol) was synthesized through the reaction between the isonicotinic acid ligand and cadmium (II) salt and characterized by elemental analysis, FTIR and UV–Visible spectroscopies, SEM and Single crystal X-ray diffraction. The crystal is orthorhombic, space group Pbca, a = 12.24(10) Å, b = 15.4646(13) Å, c = 18.8445(17) Å, V = 3569(3) Å3, Z = 8. The pentagonal bipyramid (seven coordinate) around the cadmium (II) ion is of the form CdN2O5 coordinating to four oxygen atoms from carboxylates, one oxygen atom from water molecule and two nitrogen atoms of pyridine. The structure of compound is stabilized by two hydrogen bonds namely intermolecular (O-H–O) and intramolecular type C-H– O accounting for polymeric nature of the metal-organic frameworks. 1 was studied for adsorptive removal of methyl orange (MO) from aqueous solution. Equilibrium isotherm study reveals that Langmuir model gave a better fitting result than the Freundlich model. The pseudo-second order model could be used to interpret adsorption kinetics. The maximum adsorption capacity calculated by Langmuir was 166 mg/g at 300 K. These results indicate the adsorption of MO on 1 is partly due to electrostatic interaction between methyl orange and the adsorbent. 1 could be used as adsorbent to remove methyl orange from aqueous solution.Item Synthesis, characterization and crystal structure of a copper-glutamate metal organic framework (MOF) and its adsorptive removal of ciprofloxacin drug from aqueous solution(Royal Society of Chemistry, 2020-02-13) Olawale, Margaret D.; Tella, Adedibu C.; Obaleye, Joshua A.; Olatunji, Juwon S.Therapeutic drugs are an essential and indispensable element for life. Worldwide, antibiotics are widely used for therapeutic and prophylactic purposes in human and veterinary medicine. Consequently, they are persistently released into the environment as waste water from farm, hospital, domestic and industrial effluents. Research has proved the discharge and presence of therapeutic drugs in wastewater treatment plants, rivers and lakes. Adsorption techniques are widely used for the removal of waste water pollutants due to easy operation, efficiency and the environmentally friendly nature of the technique. A [Cu(Glu)2 (H2O2)]·H2O MOF adsorbent was synthesized by the reaction of Cu2+ with glutamic acid under mixing at room temperature in a ½ : 1 molar ratio. Characterization of the compound was carried out by elemental analysis, IR and UV-Vis spec, SEM and PXRD. The crystal structure is orthorhombic with a space group of P212121. a = 7.2036(5) Å. b = 10.2696(7) Å. c = 11.0023(8) Å. Z = 4. The coordination about the copper is octahedral (6-coordinate geometry), involving four oxygen atoms from the glutamic acid and one nitrogen from the amine of the glutamate. One lattice water molecule is linked directly to the copper central metal in a terminal fashion and a lattice water molecule is found outside the coordination sphere. IR and UV-Vis spectra support coordination of the metal with the ligand. SEM shows clearly that the compound is porous for adsorption. The MOF was studied for the adsorption of aqueous ciprofloxacin drug. Sorption data were subjected to adsorption isotherms and kinetics. The adsorption isotherm data can be best described by the Temkin isotherm, and this revealed the ability of the [Cu(Glu)2(H2O)]·H2O MOF to adsorb 61.35 mg of ciprofloxacin drug per gram of copper glutamate at 25 °C, pH 4.0. The Freundlich sorption intensity supports multiple binding sites of the MOF. The kinetics of ciprofloxacin adsorption follows a pseudo-second-order kinetic model, signifying the presence of physi-sorption. The results suggested the use of [Cu(Glu)2(H2O)]·H2O MOF as an adsorbent for the removal of ciprofloxacin from aqueous solution.Item Synthesis, crystal structure, and density functional theory study of a zinc(II) complex containing terpyridine and pyridine-2,6-dicarboxylic acid ligands: Analysis of the interactions with amoxicillin(Elsevier, 2018-12-19) Tella, Adedibu C.; Obaleye, Joshua A.; Olawale, Margaret D.; Ngororabanga, Jean Marie Vianney; Ogunlaja, Adeniyi S.; Bourne, Susan A.