Abstract
stract Complexes of cobalt(II), nickel(II), copper(II), zinc(II) and Hafnium(II) of general composition [M(L)2(Cl)2] [L = 4-(phenylphosphinylideneamino-N-thiazolyl benzene-sulfonamide] have been synthesized. The elemental analysis, molar conductance measurements, magnetic susceptibility measurements, mass, IR, UV, NMR, SEM, EDX, thermal and EPR spectral studies of the compounds led to the conclusion that the ligand acts as a bidentate manner. The molar conductance of the complexes in fresh solution of DMSO lies in the range of 7.46–9.13 Ω-1 cm2 mol-1 indicating their non-electrolytic behavior. On the basis of analytical and spectroscopic techniques, octahedral geometry of the complexes was proposed. The ligand binds in a bidentate manner, coordinated through sulfonamide oxygen and thiazole nitrogen atoms. The ligand field parameters were calculated for Co(II), Ni(II) and Cu(II) complexes and their values were found in the range reported for a octahedral structure. The catalytic activities of the divalent metal complexes have been studied in the oxidation of cyclohexane by hydrogen peroxide, an environmental friendly oxidant. The molecular modeling parameters of the ligand and its Co(II) and Hf(II) complexes have been calculated.
Highlights
Available methods for the removal of phenol/phenolic compounds from wastewaters are expensive, have regeneration problems and may produce themselves wastewaters with a high environmental impact [1,2]
Researchers have recently focused on enzymatic treatments. Many peroxidases such as lignin peroxidase, manganese peroxidase, soybean peroxidase, horseradish peroxidase (HRP), laccase, polyphenol oxidases, micro peroxidases and azo peroxidases have been used for the removal of dyes in industrial effluents [3,4]
The results obtained are in good agreement with those calculated for the suggested formula (Figure 1)
Summary
Available methods for the removal of phenol/phenolic compounds from wastewaters (chemical oxidation, reverse osmosis, adsorption and others) are expensive, have regeneration problems and may produce themselves wastewaters with a high environmental impact [1,2]. Contaminating waste waters are those generated by textile and paper mill industries These wastewaters include medium to low concentrations of dyes or pigments. Researchers have recently focused on enzymatic treatments Many peroxidases such as lignin peroxidase, manganese peroxidase, soybean peroxidase, horseradish peroxidase (HRP), laccase, polyphenol oxidases, micro peroxidases and azo peroxidases have been used for the removal of dyes in industrial effluents [3,4]. High amounts of ligno-cellulosic wastes from paper and wood industries are generated, of which only 1–2% are reused. Their accumulation represents a serious environmental problem. The catalysts used in catalytic wet oxidation are transition metal oxides and supported noble metals [12]
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