12 research outputs found
Neighbouring metal induced oxidative addition at the iron centre amongst the iron–arylpyridylphosphine complexes
No full textElectron-transfer chain catalysis in phosphine replacement reaction: Determination of relative donor capability of arylpyridylphosphines
No full textPurification of metronidazole and penicillin-G contaminated water by MOF-5 imprinted cobalt ferrite
No full textWater contamination by antibiotics such as metronidazole (MTZ) and penicillin-G (PCG) is a serious concern. Therefore, this study evaluates the potential of cobalt ferrite (CoFe2O4) and cobalt ferrite imprinted terephthalic acid-zinc metal–organic framework (CoFe2O4@MOF-5) as adsorbents for the removal of MTZ and PCG from contaminated water sources. The scanning electron micrograph revealed the surfaces of CoFe2O4 and CoFe2O4@MOF-5 to be heterogeneous with irregularly shaped particles, while the Brunauer-Emmett-Teller (BET) surface area was found to be 16.63 and 12.41 m2/g for CoFe2O4 and CoFe2O4@MOF-5, respectively. The X-ray diffraction (XRD) revealed a crystallite size of 28.31 nm for CoFe2O4 and 29.01 nm for CoFe2O4@MOF-5. CoFe2O4@MOF-5 exhibited higher sorption capacity towards MTZ (94.47 mg g−1) and PCG (90.28 mg g−1) than values displayed by CoFe2O4 towards MTZ (50.41 mg g−1) and PCG (55.76 mg g−1). The sorption process may be described by the Langmuir and Freundlich isotherms with a quantum chemical simulation analysis that revealed the process mechanism to be via electronic interaction. The regeneration capacity of CoFe2O4@MOF-5 was higher than that of CoFe2O4, with a regeneration capacity of 91.71 % for MTZ and 89.31 % for PCG at the 10th regeneration cycle. Furthermore, CoFe2O4@MOF-5 compared favourably with previously reported adsorbents. The study's findings revealed CoFe2O4@MOF-5 as a promising material for the purification of water contaminated with MTZ and PCG
Preparation of MOF-5 imprinted chromium ferrite and its application in decontaminating metronidazole and penicillin G contaminated water system
No full textAbstract Metronidazole (MZ) and penicillin G (PG) are antibiotics frequently detected in aqueous systems as pollutants. Their presence in water systems is a global challenge requiring the development of sustainable solutions for water purification. Therefore, this study synthesized and improved the adsorption performance of chromium ferrite (CrFe2O4) via incorporation of metal-organic framework (MOF-5) to produce CrFe2O4@MOF-5 composite. CrFe2O4@MOF-5 and CrFe2O4 were characterized using a series of analytical instrument. Both adsorbents exhibited a four-phase mass loss from the thermogravimetric analysis, while the Brunauer-Emmett-Teller (BET) results gave a surface area of 40.94 m² g− 1 for CrFe2O4 and 59.76 m² g− 1 for CrFe2O4@MOF-5. Interestingly, microscopical images unfolded the surfaces of CrFe2O4@MOF-5 and CrFe2O4 to be heterogeneous, while elemental surface mapping confirmed the constituent elements of CrFe2O4@MOF-5 and CrFe2O4 to be Cr, Fe, O, C and Zn. CrFe2O4@MOF-5 exhibited a higher affinity (91.67 mg g− 1) for PG than CrFe2O4 (53.82 mg g− 1). Similarly, the performance of CrFe2O4@MOF-5 was better (90.24 mg g− 1) compared to CrFe2O4 (50.41 mg g− 1) towards MZ. Both Freundlich and Langmuir isotherm may describe the removal process of MZ and PG by CrFe2O4@MOF-5 while sorption of MZ and PG by CrFe2O4 fitted best for Langmuir isotherm in a sorption mechanism involving electrostatic interaction and pore diffusion. The adsorption performance of CrFe2O4@MOF-5 and its regeneration capacity compared agreeably with most published adsorbents in literature. This current study showed CrFe2O4@MOF-5 as a potential adsorbent for decontaminating MZ and PG-polluted water systems
Preparation and application of nickel copper ferrate and its metal–organic framework composite in the decontamination of chemical indicator contaminated synthetic and raw laboratory wastewater
No full textInefficient decontamination of laboratory wastewater polluted by chemical indicators such as methyl orange (MO) and phenolphthalein (PH) is a challenge that requires attention in most developing countries. In response to this, nickel-copper ferrate (NiCuFeO4) and nickel-copper ferrate-terephthalic acid-zinc metal–organic framework composite (NiCuFeO4@MOF-5) were synthesised via simple chemical process and their activities compared for the removal of MO and PH from synthetic and raw laboratory wastewater colleccted from a science laboratory at Federal Polytechnic, Ede, Nigeria. The scanning electron micrograph (SEM) images, revealed the surfaces of NiCuFeO4 and NiCuFeO4@MOF-5 to be rough and homogeneous with tightly arranged particles that are agglomerated. The adsorption capacity of NiCuFeO4@MOF-5 expressed for the removal of MO (30.97 mg g−1) and PH (41.22 mg g−1) from aqueous solution is higher than that of NiCuFeO4 for MO (25.82 mg g−1) and PH (23.00 mg g−1). NiCuFeO4 and NiCuFeO4@MOF-5 exhibited a promising stability even at the 7th regeneration cycle for the removal of MO and PH from solution. Results obtained for the removal of MO and PH from aqueous solution by NiCuFeO4 and NiCuFeO4@MOF-5 compared favorably with reported adsorbents in literature. Conclusively, NiCuFeO4@MOF-5 is a potential and better adsorbent than NiCuFeO4 for decontaminating laboratory wastewater contaminated with MO and PH
<b>Solventless migratory-insertion reactions of substituted cyclopentadienyl iron complexes induced by electron donor ligands</b>
Full text linkReaction between solid (C5H5)Fe(CO) 2CH3 and a range of solid phosphine ligands, L (L = PPh3, P(m-CH3C6H4)3, P(p-CH3C6H4)3, P(p-FC6H4)3, P(p-ClC6H4)3, PCy3) occurred in the absence of solvent in the melt phase to give the migratory-insertion products, (C5H5)Fe(CO)(COCH3)(L). The reaction was more rapid with small electron withdrawing ligands. Insertion reaction between (RC5H4)Fe(CO) 2 R’ (R = H, CH3; R’ = CH3, CH2Ph) and gaseous ligands such as SO2 and CO were also studied. The insertion of SO2 occurred readily for all the substrates investigated, but CO insertion did not occur (< 1 %) using the solventless reaction condition
Synthesis of N, N(1,3-phenylene)dimethanimine: A useful resource for the removal of free fatty acid in waste vegetable oil
Full text linkDeveloping an efficient material for the removal of free fatty acids (FFAs) in waste vegetable oil is a challenge in the refining of vegetable oil in food and oleochemical industries. In response to this, N,N(1, 3-phenylene)dimethanimine (NPD) was synthesized via green reaction route without involving solvent. NPD was characterized using Fourier transformed infrared spectroscopy (FTIR), X-ray diffraction (XRD), transmission electron microscopy (TEM), thermogravimetric (TG) analysis, scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX). NPD was then applied as a material for the removal of FFA from waste cooking oil (WCO). The synthesis process gave a high yield of 95% of NPD. The FTIR result revealed different functional groups in NPD, the TG showed mass loss at diverse temperature range revealing loss at 80–150, 180–250, 250–410 and 410–600 °C while loss above 600 °C was assigned to loss of char. while TEM revealed the surface of NPD to be smooth with an irregular shape. EDX results further demonstrated the presence of oxygen, nitrogen and carbon in NPD. Removal of FFA from WCO may be described by pseudo-second-order with an adsorption capacity of 42.30 L kg-1. The process obeyed Langmuir isotherm with ?H of -0.679 kJ mol-1 and ?S of -0.049 kJ mol-1 K-1 while ?G increased with increase in temperature. The Density Functional Theory (DFT) concept was used to explain the action of NPD as an adsorbent with the aid of lowest unoccupied molecular orbital (LUMO) and the highest occupied molecular orbital (HOMO). It revealed the mechanism of removal of FFA from WCO by NPD to be via nucleophilic interaction
The solid-state isomerization of <strong><i>cis</i></strong>- and <strong><i>trans</i></strong>-(η<sup>5</sup>-C<sub>5</sub>H<sub>4</sub>Me)Mo(CO)<sub>2</sub>(P(O<sup><strong><i>i</i></strong></sup>Pr)<sub>3</sub>)I
No full textSolar-active clay-TiO2 nanocomposites prepared via biomass assisted synthesis: Efficient removal of ampicillin, sulfamethoxazole and artemether from water
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