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Articles by J.F. Adediji
Total Records ( 2 ) for J.F. Adediji
  J.F. Adediji , M.A. Adebayo and J.A. Obaleye
  The complexes of the type ML2 were prepared. [Where M=Mn (II) and Fe (III)], L = 2,5-diamino-1,3,4-thiadiazole. The ligand (L) has been prepared by cyclisation of bithiourea in a 3% hydrogen peroxide medium. The complexes are non-electrolyte in DMF. The elemental analysis, magnetic measurements, conductivity measurements and spectral studies of the complexes were carried out. 2,5-diamino-1,3,4-thiadiazole acts as neutral tridentate ligand and coordinates through the sulphur atom and nitrogen of the amines. It was tentatively inferred that complexes exhibited octahedral geometry. The antimicrobial activities of ligand and its complexes were screened using sensitivity test, minimum inhibition concentration and minimum bacterial concentration method. Metal chelates showed greater antimicrobial activities as compared to the control and the ligand. The metal chelates and the ligand did not exhibited activity against Aspergillus niger and Penicillin species. The toxicological study carried out on albino rat (Wistar strain) showed that the ligand and the metal chelates do not show toxicity at the orally administered dosage-level (0.6 mg kg-1 body weight).
  M.A. Adebayo , J.F. Adediji , A.A. Adebayo and O.T. Adebayo
  The biosorption of Ni2+ by Streblus asper, biomass was investigated in single metal solution. Batch kinetic studies were carried out in order to determine effect of adsorbent and adsorbate dose, pH of solution, agitation time and temperature on biosorption of Streblus asper. The maximum Ni2+ biosorption was obtained at pH 6.0. The equilibrium nature of Ni2+ biosorption was described by the Freundlich and Dubinin-Radushkevich isotherms. The value of n, the intensity of adsorption, is ≈2 indicating that Ni2+ is favourably biosorbed by Streblus asper. The saturation capacity, qm, of Ni2+ by Streblus asper was calculated to be 40.48 mg g-1. The value of the mean free energy of biosorption was calculated to be 4082.48 kJ mol-1 which indicates that the biosorption may occur via a chemical ion-exchange mechanism. The results of the thermodynamic investigations indicated that the adsorption reactions were spontaneous (ΔG<0), endothermic (ΔH>0) and irreversible (ΔS>0). The pseudo second-order kinetic model was used to analyse the kinetic data. The second order rate constants for the biosorption of Ni2+ from solutions by Streblus asper was evaluated to be 1.35 g mg-1 min-1.
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