Heteronuclear arsenic−iron carbonyl cluster anions As m Fe(CO) n − (m, n = 2, 3) have been generated in the gas phase and investigated by massselected infrared photodissociation spectroscopy and density functional theory calculations at the B3LYP/BP86/TPSS levels. All the As m Fe(CO) n − (m, n = 2, 3) cluster anions are determined to contain Fe(CO) n − fragments, which can be regarded as being formed by replacing one arsenic atom of the arsenic clusters As m+1 with the Fe(CO) n − group. Bonding analyses indicated that each As 2 Fe(CO) n − (n = 2, 3) cluster anion involves two Fe−As single bonds and one As−As double bond. Each As 3 Fe(CO) n − (n = 2, 3) cluster anion has three Fe−As single bonds and three As−As single bonds. The Fe(CO) 3− group with a 15electron configuration is valence isoelectronic to the As atom and can serve as a building block for forming heteronuclear arsenic−iron carbonyl clusters.
Heteronuclear Group 15 metal–iron carbonyl cluster complexes of AmFe(CO)n− (A = Sb, Bi; m, n = 2–3) were generated in the gas phase and studied by infrared photodissociation spectroscopy in...
The active magnesium oxide (AMO) was synthesized by homogeneous precipitation method with microwave and characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and infrared spectroscopy (FTIR). Adsorption of Sr(II) by AMO was investigated under the effect of AMO dosages, pH of solution, temperature and contact time and analyzed the kinetics and thermodynamics characteristics. The results showed that AMO has very good adsorption capacity on Sr(II) in aqueous solution,When pH of solution is 8.0, the solid-liquid ratio is 0.25 g·L−1, initial Sr(II) concentration is 50mg·L−1, the contact time is 80 min at 298K, the removal rate and adsorption capacity reached 98.29% and 187.5 mg·g−1, respectively. Kinetic and thermodynamic results indicate that adsorption behavior of Sr(II) by AMO fitted well with pseudo-second-order model and the Freundlich isothermal model. Adsorption thermodynamic parameters showed that the process of adsorption is spontaneous and endothermic.
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