Vincent Adimula - Academia.edu (original) (raw)

Papers by Vincent Adimula

Inorganic and Nano-Metal Chemistry, May 26, 2022

Nigerian Journal of Pharmaceutical and Applied Science Research, 2017

Journal of Inorganic and Organometallic Polymers and Materials, 2021

The coordination polymer [Cu 2 (TDPH) 4 (QNX)].DMF, (QNX = Quinoxaline; TDPH = 3,3thiodipropionic... more The coordination polymer [Cu 2 (TDPH) 4 (QNX)].DMF, (QNX = Quinoxaline; TDPH = 3,3thiodipropionic acid), has been prepared by reaction of copper acetate, TDPH, and quinoxaline. The compound was characterized by elemental analysis, FTIR spectroscopy, and single-crystal Xray diffraction. The crystal is monoclinic with a P21/n space group and dimensions of a = 12.889(3) Å, b = 14.983(4) Å, c = 14.091(3) Å, α = 90 °, β = 90.200(11) °, γ = 90 °, V = 2721.18 (2) Å 3 , Z = 4. The ligands are hexagonally coordinated to the Cu(II) centre in the form of Cu2O4N with one nitrogen atom from the quinoxaline ligand, and four oxygen atoms from four TDPH molecules in a monodentate fashion. The Cu-Cu bond length was 2.642(1) and 2.629(1) Å for the Cu1-Cu1 and Cu2-Cu2 bonds. The QNX ligand bridged the two copper atoms. The catalytic reduction of 4-nitrophenol to 4-aminophenol using NaBH4 in the presence of [Cu 2 (TDPH) 4 (QNX)].DMF, as catalyst was completed within 11 minutes. The 4-aminophenol product was confirmed using 1 H NMR spectroscopy.

Solvent extraction studies using Cyanex®272 for the extraction of zinc from spent galvanized zinc... more Solvent extraction studies using Cyanex®272 for the extraction of zinc from spent galvanized zinc-ash after leaching in hydrochloric acid (HCl) is reported. Elemental analysis of the spent galvanized material by X-ray fluorescence (XRF) showed the percentage content of zinc to be 93.6 % with ZnO being the major compound detected by X-ray diffraction (XRD) method. The leaching solution by 1 mol/L HCl examined by Aquamate Thermo-Electron Corporation UV-Visible spectrophotometer contains 2991 mg/L zinc with other elements: Mn, Cu, Zn, Cr, Cd and Pb occuring from low to trace levels (≤ 1%). The results of solvent extraction of zinc by 0.25 mol/L Cyanex®272 in kerozene yielded 85.21 % extraction efficiency within 25 minutes at 27 ± 2oC. At optimal conditions, the study showed that a phase ratio of 1:1 for the organic : aqueous phase extracted 96.6 % of the total zinc into the organic phase at pH 4, of which 98 % of the loaded organic phase was quantitatively stripped by 0.1 mol/L HCl sol...

Zeitschrift für anorganische und allgemeine Chemie, 2021

Please refer to published version for the most recent bibliographic citation information. If a pu... more Please refer to published version for the most recent bibliographic citation information. If a published version is known of, the repository item page linked to above, will contain details on accessing it.

Journal of Chemical Society of Nigeria, 2020

The bleaching efficiency of activated carbon prepared from teak leaves was investigated for the r... more The bleaching efficiency of activated carbon prepared from teak leaves was investigated for the removal of pigments from palm oil. The adsorbents were activated using KOH and FeCl3 as activating agents. The effects of adsorbent dosage (2% - 6 %), contact time (15 min. – 90 min.) and temperature (30 °C – 80 °C) were studied, while the unactivated adsorbent was used as standard. The ash content, moisture content, volatile matter content, and fixed carbon content were determined and the adsorptive bleaching of palm oil investigated using 1.2 g activated carbon with 20 g crude palm oil. Bleaching efficiency was observed to be 93.09 % and 96.68 % for the KOH and FeCl3 activated adsorbent respectively, while the unactivated adsorbent was observed to have a bleaching efficiency of 89.21 %. The optimum bleaching efficiency was observed at a temperature of 70 °C, adsorbent dosage of 6 %, and contact time of 90 min. Results obtained suggests that teak leaves can be a source of low-cost adsorb...

Chemical Papers, 2020

Piroxicam is a member of the oxicam group known to be nonsteroidal anti-inflammatory drugs (NSAID... more Piroxicam is a member of the oxicam group known to be nonsteroidal anti-inflammatory drugs (NSAID) which are used in the treatment of pain and arthritis. To improve its effectiveness and lessen the occurrence of side effects, the need to develop drug carrier systems tuned towards improved loading capability and controlled release is imperative. We herein report the synthesis of the zinc-terephthalate metal-organic frameworks (MOFs) and its functionalization by incorporation of amino and cyano groups using ethylenediamine (en) and malononitrile (MN), respectively, for the delivery of piroxicam drug. The functionalized and unfunctionalized MOFs were characterized using elemental analysis, Fourier transforms infrared spectroscopy (FTIR), scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET) and Powder X-ray diffraction (PXRD). BET analysis showed that the zinc terephthalate, zinc terephthalate-en and zinc terephthalate-MN have a surface area and total pore volume of 3130 m 2 /g (1.437 cm 3 /g), 3069 m 2 /g (1.361 cm 3 /g) and 2975 m 2 /g (1.232 cm 3 /g), respectively. The amounts of drug (Piroxicam) loaded on zinc terephthalate and zinc terephthalate-en are 92.06 wt% and 95.23 wt%, respectively. This work reveals that the as-synthesized functionalized MOFs can serve as promising candidates for the delivery of the piroxicam drug and other nonsteroidal anti-inflammatory drugs.

African Journal of Science, Technology, Innovation and Development, 2019

Levels of some heavy metals were investigated in 114 snack samples consumed in Ibadan city, Niger... more Levels of some heavy metals were investigated in 114 snack samples consumed in Ibadan city, Nigeria. The concentrations of the selected metals were observed to range widely in the sampled food snacks: cadmium (0.004 to 0.892 mg/kg), cobalt (0.090 to 0.797 mg/kg), chromium (0.015 to 0.702 mg/kg), copper (0.077 to 07.548 mg/kg), iron (0.070 to 65.11 mg/kg), nickel (0.165 to 3.327 mg/kg), lead (0.069 to 1.207 mg/kg), and zinc (0.015 to 94.382 mg/kg). Mean concentrations of the selected heavy metals were found to range from 0.179 mg/kg (observed for cadmium) to 21.632 mg/kg (observed for iron) among the snacks, with iron having the highest level observed in bean cake (62.397 ± 20.10 mg/kg). The levels of the selected heavy metals in the foods were comparable with data reported in studies carried out in other countries. The daily dietary intake of the selected metals for the adult population was observed to differ in the income groups, with the highest intakes observed in the low-income group. For example, dietary intakes of cadmium observed to be 0.080 mg/ person/day for the low income group, 0.061 mg/person/day for the middle income group, and 0.040 mg/person/day for the high income group were higher than the range (0.01 to 0.02 mg/person/day) specified by the European Commission (1996).

Journal of Environmental Sciences, 2017

We herein report the removal of amodiaquine, an emerging drug contaminant from aqueous solution u... more We herein report the removal of amodiaquine, an emerging drug contaminant from aqueous solution using [Zn 2 (fum) 2 (bpy)] and [Zn 4 O(bdc) 3 ] (fum = fumaric acid; bpy = 4,4-bipyridine; bdc = benzene-1,4-dicarboxylate) metal-organic frameworks (MOFs) as adsorbents. The adsorbents were characterized by elemental analysis, Fourier transform infrared (FT-IR) spectroscopy, and powder X-ray diffraction (PXRD). Adsorption process for both adsorbents were found to follow the pseudo-first-order kinetics, and the adsorption equilibrium data fitted best into the Freundlich isotherm with the R 2 values of 0.973 and 0.993 obtained for [Zn 2 (fum) 2 (bpy)] and [Zn 4 O(bdc) 3 ] respectively. The maximum adsorption capacities foramodiaquine in this study were found to be 0.478 and 47.62 mg/g on the [Zn 2 (fum) 2 (bpy)] and [Zn 4 O(bdc) 3 ] MOFs respectively, and were obtained at pH of 4.3 for both adsorbents. FT-IR spectroscopy analysis of the MOFs after the adsorption process showed the presence of the drug. The results of the study showed that the prepared MOFs could be used for the removal of amodiaquine from wastewater.

Nanomaterials for Soil Remediation, 2021

Communications Faculty Of Science University of Ankara Series B Chemistry and Chemical Engineering, 2018

The synthesis of Co(II), Cu(II), Fe(II) and Zn(II) based coordination compounds using terephthali... more The synthesis of Co(II), Cu(II), Fe(II) and Zn(II) based coordination compounds using terephthalic acid (BDC), tartaric acid (DHB), and 4hydroxybenzoic acid (4-HBA) as ligands by a solvent-based and solvent-free methods were reported. Thermal studies of the complexes performed in the temperature range of 30 ºC-950 °C showed a 9.406% weight loss observed between 200 ºC-517 ºC for [Co(DHB)(4-HBA)] complex, and a 1.883 % weight loss observed between 80 ºC-352.68 ºC for [Cu(DHB)(4-HBA)] complex.

The interaction of eosin B dye from aqueous solution with MIL-100(Fe) and functionalized MIL-100(... more The interaction of eosin B dye from aqueous solution with MIL-100(Fe) and functionalized MIL-100(Fe) metal–organic frameworks (MOFs) is reported in this study. MIL-100(Fe) was prepared and functionalized with thioglycolic acid (TH) and ethylenediammine (ED) separately by incorporating the thiol (–SH) and the amine (–NH 2 ) group of the functionalizing agents into the open metal sites of the MIL-100(Fe) to obtain the acidic (TH-MIL-100) and basic (ED-MIL-100) forms of the MOF respectively. Characterization of the MOFs was done by melting point analysis, elemental analysis, spectroscopic techniques, scanning electron microscopy (SEM), and powdered X-ray diffraction (PXRD) analysis. The adsorption experiments were carried out at different conditions such as pH, adsorbent dosage, contact time, temperature, and initial concentration of the dye to estimate the optimum conditions and the maximum adsorption capacities. Adsorption capacities were observed to increase in the order of ED-MIL-1...