Biochar from Slow Pyrolysis of Palm Kernel Seeds: Preparation, Characterization, and Solid Fuel Properties Sunday E. Elaigwu, Vincent O. Adimula, Anthony U. Awode Solid Fuel Chemistry, 2025 Abstract In this study, biochar was prepared by slow pyrolysis of palm kernel seeds at 350°C for 2 h. Characterization of the raw material (palm kernel seeds) and biochar was carried out by elemental analysis, FTIR, BET and SEM analyses. The results showed that the pyrolysis process transformed the palm kernel seeds, resulting in an increase in the carbon content and decrease in the hydrogen and oxygen contents of the biochar. The transformation was also obvious in the FTIR spectra, with the biochar showing peaks with less intensity than the raw material. The SEM images further confirmed the changes as the oily morphology of the raw material was not observed in the biochar, while the BET analysis showed an increase in the surface area from 3.03 m2/g in the raw material to 45.15 m2/g in the biochar. The results of the solid fuel properties showed that the higher heating value (HHV) increased from 24.04 MJ/kg in the raw material to 27.15 MJ/kg in the biochar, while the energy densification ratio was 1.13 in the biochar. The energy properties of the prepared biochar are consistent with previous studies, indicating that the biochar has the potential for development as solid fuel. Consequently, pyrolysis could be an attractive technique for converting this waste material into high value-added product.
Synthesis, Electronic, Dynamic Optical and Adsorption (Monte Carlo and Molecular Dynamics) Properties of Cadmium Picolinate Coordination Polymer-2 (Cp-2) Margaret D. Olawale, Nathanael D. Ojo, Oluwatoba E. Oyeneyin, Vincent O. Adimula, Tolutope O. Siyanbola Journal of Computational Biophysics and Chemistry, 2025 The cadmium picolinate coordination polymer (CP-2) was synthesized through the reaction of picolinic acid with cadmium acetate dihydrate. CP-2 was characterized using spectroscopic techniques, elemental analysis and powder X-ray diffraction. Variations in melting point, infrared and ultraviolet-visible spectra, along with the results of elemental analysis and powder X-ray diffraction, strongly support the successful formation of the cadmium-picolinic acid CP. The molecular, electronic, optical and adsorption properties of the CP-2 were studied using density functional theory (DFT), time-dependent DFT (TD-DFT), molecular dynamics (MD) and Monte Carlo (MC) simulations. The DFT calculations with B3LYP/LANL2DZ/6-311[Formula: see text]G(d,p) method provided insights into the molecular reactivity and electronic structure, revealing key reactivity parameters (such as frontier orbital energies, energy gap, electronegativity and electrophilicity) and charge distribution within the CP. Dynamic optical calculation was conducted using coupled perturbed Hartree-Fock formalism with DFT/B3LYP/LANL2DZ/6-311[Formula: see text]G(d,p) method. TD-DFT calculations elucidated the electronic absorption properties of the CP, with a low-energy transition at 341 nm. The static [[Formula: see text](0;0,0); [Formula: see text](0;0,0,0)] and dynamic [EOPE: [Formula: see text];[Formula: see text],0)]); SHG: [Formula: see text]2[Formula: see text];[Formula: see text],[Formula: see text]]; EOKE: [Formula: see text];[Formula: see text],0,0); DCSHG: [Formula: see text]2[Formula: see text];[Formula: see text],[Formula: see text],0)] nonlinear optical properties ([Formula: see text] 0.042823 au) displayed large hyperpolarizabilities, suggesting potential applications in SHG and THG. The third-order NLO properties were greater than those of the KH2PO4 (standard). MC simulations explored the adsorption of selected gases (CO2, CH4, H2S, HCHO, NH3) and 2,4-dinitrotoluene (DNT) on the CP-2, revealing strong binding interactions, particularly with H2S. MD simulations further confirmed the stability of the adsorbates on the CP-2 framework.
Adsorptive removal of methylene blue dye from aqueous solution by a synthesized Cu(II)-quinoxaline and 4-(aminomethyl)benzoic acid coordination compound Vincent O. Adimula, Deborah O. Josiah, Sunday E. Elaigwu, Nsikak B. Essien, Hadley S. Clayton, et al. Analytical Chemistry Letters, 2025 The need for clean water resources worldwide for health and well-being has become imperative due to the increasing population and pollution of water bodies arising from indiscriminate effluent discharge. Dye-polluted effluent from textile industries is reported to be one of the sources of water pollution. The difficulty in the remediation of dye-polluted water stems from the structural complexity of these synthetic dyes and their high solubility in water. Removal of methylene blue (MB) dye from water by a synthesized coordination compound formulated as [Cu(QXN)(AMB)] 1 is herein reported (where QXN= Quinoxaline and AMB= 4-(Aminomethyl)benzoic acid). The synthesized Cu(II) compound was characterized by spectroscopic techniques, scanning electron microscopy, thermogravimetric analysis, and BET measurements. The morphology of the compound was observed to have changed significantly after the adsorption of methylene blue (MB) dye. Uptake of MB by 1 was monitored with the aid of UV-Vis spectroscopy. The adsorption capacity of 1 toward MB was optimized at pH 13, 4 hours and 15 mg/L respectively. Adsorption was observed to be more favoured at alkaline pH, suggesting electrostatic interaction between the adsorbate and the adsorbent. The experimental data tested with Langmuir, Freundlich, Temkin, and Dubinin-Radsuhkevich isotherms indicated that the data fitted well with the Dubin-Radushkevich isotherm with an R2 value of 0.9345 suggesting a heterogeneous surface for the adsorbent. Adsorption kinetics, modelled with the Pseudo-first order, Pseudo-second order, Elovich and Intra-particle diffusion models revealed that the Pseudo-second order model best fit the adsorption data, with an R2 value of 0.9383, indicating the occurrence of chemisorption. The synthesized [Cu(QXN)(AMBA)] 1, as adsorption material, showed great potential for dye removal from water with the potential to be reused for more than five cycles.
Adsorptive Removal of Congo Red Dye by a Synthesized Dual Ligand (Carboxylate and N-donor) Coordination Compound Chemist, 2025
Modern Innovations in Food Preservations: Mini-review Chemist, 2024
Synthesis and characterization of the Cu(II)-quinoxaline, 3,3-thiodipropionate mixed ligand coordination polymer for the removal of methylene blue from aqueous solution Vincent O. Adimula, Sunday E. Elaigwu, Samson O. Owalude, Hadley S. Clayton, Adeteju A. Rotifa, Emmanuel Adeniyi, Adedibu C. Tella Chemical Engineering Communications, 2024 Herein, we report the removal of methylene blue (MB) dye from water by Cu(II)-quinoxaline, 3,3-thiodipropionate mixed ligand coordination polymer synthesized as [Cu2(TDPH)4(QNX)]·DMF. Characterization of the synthesized material was carried out by elemental analysis, thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), BET surface area analysis, X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM), and UV–visible spectroscopy. ν(C = O) and ν(C–O) absorption bands were detected at 1735 and 1093 cm−1, respectively, while ν(C = N) was observed at 1608 cm−1 in the synthesized compound. The synthesized material was used as adsorbent for the removal of MB dye from aqueous solution using batch adsorption technique. The maximum adsorption capacity was found to be 7.9745 mg/g, while the maximum decolorization efficiency for the adsorbent was observed to be 99.04%. Adsorption data from the study fitted the Langmuir isotherm with an R2 value of 0.9815, while the adsorption kinetics followed the pseudo-second-order kinetic model with an R2 value of 0.9953. The results obtained from the study, therefore showed that the synthesized materials could be used as adsorbents in wastewater treatment.
Interaction of nanoparticles with soil Clement Oluseye Ogunkunle, Stephen Oyedeji, Hussein Kehinde Okoro, Vincent Adimula Nanomaterials for Soil Remediation, 2020
Spent galvanized zinc-ash processing part (II): Solvent extraction of zinc from leached liquor by Cyanex®272 Journal of Chemical Technology and Metallurgy, 2018
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Synthesis, Electronic, dynamic optical and adsorption (Monte Carlo and molecular dynamics) properties of cadmium picolinate coordination Polymer-2 (Cp-2) MD Olawale, ND Ojo, OE Oyeneyin, VO Adimula, TO Siyanbola Journal of Computational Biophysics and Chemistry 24 (10), 1441-1455 , 2025 2025 Citations: 4
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Adsorptive removal of methylene blue dye from aqueous solution by a synthesized Cu (II)-quinoxaline and 4-(aminomethyl) benzoic acid coordination compound VO Adimula, DO Josiah, SE Elaigwu, NB Essien, HS Clayton, ... Analytical Chemistry Letters 15 (4), 718-730 , 2025 2025 Citations: 1
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Synthesis, Characterization and Antibacterial Analysis of Zerovalent Iron Nanoparticles from Cymbopogon Citratus and Vernonia Amygdalina Plant Extracts as a Means of … TC Bamigbola, FA Adekola, DO Adetitun, VO Adimula Ilorin Journal of Science 11 (3 (Special)), 220-228 , 2024 2024
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The facile synthesis of cationic Ru (II)-hydrazine and hydrazone complexes containing ethyldiphenylphosphine and methyldiphenylarsine ligands SO Owalude, VO Adimula, AC Tella, UB Eke Bayero Journal of Pure and Applied Sciences 15 (1), 147-151 , 2022 2022 Citations: 1
RECENT ADVANCES TOWARDS THE APPLICATION OF METAL-ORGANIC FRAMEWORKS (MOFS) FOR THE REMEDIATION OF ORGANIC POLLUTANTS IN THE ENVIRONMENT AC Tella, HK Okoro, VO Adimula, O Ajibola, SO Ayika, C Zvinowanda, ... FEB-FRESENIUS ENVIRONMENTAL BULLETIN, 9313 , 2022 2022 Citations: 1
Synthesis, structure, and properties of a dinuclear Cu (II) coordination polymer based on quinoxaline and 3, 3-thiodipropionic acid ligands AC Tella, SO Owalude, VO Adimula, AC Oladipo, VT Olayemi, B Ismail, ... Journal of Inorganic and Organometallic Polymers and Materials 31 (7), 3089-3100 , 2021 2021 Citations: 9
MOST CITED SCHOLAR PUBLICATIONS
Synthesis of zinc-carboxylate metal-organic frameworks for the removal of emerging drug contaminant (amodiaquine) from aqueous solution AC Tella, SO Owalude, SJ Olatunji, VO Adimula, SE Elaigwu, LO Alimi, ... Journal of Environmental Sciences , 2017 2017 Citations: 73
Synthesis of metal–organic frameworks (MOFs) MIL-100 (Fe) functionalized with thioglycolic acid and ethylenediamine for removal of eosin B dye from aqueous solution AC Tella, JT Bamgbose, VO Adimula, M Omotoso, SE Elaigwu, ... SN Applied Sciences 3 (1), 136 , 2021 2021 Citations: 46
Interaction of nanoparticles with soil CO Ogunkunle, S Oyedeji, HK Okoro, V Adimula Nanomaterials for soil remediation, 101-132 , 2021 2021 Citations: 38
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Assessment of heavy metals in foods and adult dietary intake estimates VO Adimula, PC Onianwa, O Ilupeju, E Ayom, AA Baba African Journal of Science, Technology, Innovation and Development 11 (2 … , 2019 2019 Citations: 24
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Synthesis and characterization of amino and cyano-functionalized zinc-terephthalate metal–organic frameworks for loading of piroxicam drug AC Tella, SE Eliagwu, M Amali, AT Kola-Mustapha, SJ Olatunji, F Ishola, ... Chemical Papers 74 (7), 2287-2296 , 2020 2020 Citations: 17
Synthesis and crystal structures of zinc (II) coordination polymers of trimethylenedipyridine (tmdp), 4-nitrobenzoic (Hnba) and 4-biphenylcarboxylic acid (Hbiphen) for … AC Tella, AC Oladipo, VO Adimula, VT Olayemi, TO Dembaremba, ... Polyhedron 192, 114819 , 2020 2020 Citations: 16
Removal of organic pollutant (pyrene) from aqueous solution using coordination polymer of [Cu(Pic) 2 (H 2 O) 2 ]·H 2 O (CP-1) as adsorbent AC Tella, MD Olawale, JA Obaleye, VO Adimula, LO Alimi, PA Ajibade Applied water science 9 (7), 159 , 2019 2019 Citations: 15
Synthesis, characterization and density functional theory of copper (II) complex and cobalt (II) coordination polymer for detection of nitroaromatic explosives AC Tella, VT Olayemi, FA Adekola, AC Oladipo, VO Adimula, JO Ogar, ... Inorganica Chimica Acta 515, 120048 , 2021 2021 Citations: 13
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Synthesis, structural and DFT investigation of Zn(nba) 2 (meim) 2 for adsorptive removal of eosin yellow dye from aqueous solution AC Oladipo, AC Tella, VT Olayemi, VO Adimula, TO Dembaremba, ... Zeitschrift für anorganische und allgemeine Chemie 647 (7), 783-793 , 2021 2021 Citations: 6
Synthesis, Electronic, dynamic optical and adsorption (Monte Carlo and molecular dynamics) properties of cadmium picolinate coordination Polymer-2 (Cp-2) MD Olawale, ND Ojo, OE Oyeneyin, VO Adimula, TO Siyanbola Journal of Computational Biophysics and Chemistry 24 (10), 1441-1455 , 2025 2025 Citations: 4
Design of a Nickel mixed-ligand coordination compound for the removal of pollutant dye, methyl orange, from water VO Adimula, ND Oyekola, AF Oniye, MO Bamigboye, EO Adeniyi, ... Discover Chemistry 1 (1), 23 , 2024 2024 Citations: 4
Iron (III)-Tricarboxylate Metal-Orgonic Framework (MOF) as drug carrier in the loading of codeine MO Ologe, SJ Olatunji, E Ademola, GK Obiyenwa, VO Adimula, ... Discover Molecules 2 (1), 26 , 2025 2025 Citations: 2
Coordination polymers based on mixed carboxylate ligands: Synthesis and thermal studies O vincent Adımula, C adedibu Tella, C ıfechukwu Udeaja, ... Communications Faculty of Sciences University of Ankara Series B Chemistry … , 2018 2018 Citations: 2