The title metal complexes were found to be crystalline which have been characterized by elemental analysis, electrical conductivity, magnetic susceptibility measurements, and spectral techniques viz, UV-Visible, FT-IR and NMR (1 H-NMR and 13 C-NMR). These complexes were air-stable, with high melting points and were soluble in methanol and some other organic solvents such as n-hexane, diethylether and DMSO. The molar conductance of 1 × 10-3 M solutions of the metal complexes in methanol at 27°C indicates that they behave as electrolytes. Both Cobalt(II) and Nickel(II) complexes of N-benzylideneaniline ligand show paramagnetic nature. The electronic studies along with magnetic data suggest a square planer geometry for both Co(II) and Ni(II) complexes. The peak in FT-IR spectra at 1627 cm-1 confirmed the υ(C=N) stretching vibration found in the free ligand. This band was shifted to a lower frequency (1603.5 cm-1) in the spectra of the metal complexes and it confirms the participation of azomethine nitrogen in the coordination of metal ions. Finally, the metal complexes were screened for their catalytic activity in the phenol benzoylation reaction and found to be moderately active.
Fluoride is one of the largely abundant elements occurring in groundwater in Ethiopia and creates a major problem out of harm's way groundwater supply. Occurrence of fluoride above the set limit in drinking water consumed by human beings has caused multi-dimensional physical condition tribulations. The present study describes the preparation of low cost adsorbent and to evaluate its adsorption efficiency for removal of fluoride ion in artificially prepared waste water using peanut husk powder. The set adsorption study was applied to study the defluoridating effectiveness by varying contact time, adsorbent dose, adsorbate concentration, and pH. Prepared adsorbent showed better removal of fluoride by 82.3% at equilibrium contact time of 80 minutes. The adsorption information appeared to be well integral to both the Langmuir and Freundlich isotherm model. The adsorption capacity (q m ) and adsorption coefficient (b) was obtained as 22.6 mg/g and 0.14 L/mg respectively and the results are suggesting that the treated peanut husk has a reasonable defluoridating capacity and could be considered as an effective and appropriate adsorbent for a sustainable solution to mitigate the fluoride problem. This study is a step in developing a general platform suitable for producing potable water that also specifically addresses the problem of fluoride.
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