The removal of cadmium, copper, and zinc from aqueous solution using activated carbon impregnated with 8-Hydroxyquinoline （oxine） was investigated in this study. The study was conducted using a completely mixed batc...The removal of cadmium, copper, and zinc from aqueous solution using activated carbon impregnated with 8-Hydroxyquinoline （oxine） was investigated in this study. The study was conducted using a completely mixed batch technique. Quantitative evaluation of the experimental results showed that the adsorption capacity of oxine impregnated activated carbon was higher than that of the virgin activated carbon for the three heavy metals. For oxine impregnated activated carbon, the Freundlieh distribution coefficient, kd , values were 23, 100, and 104 times larger than those of the virgin activated carbon for cadmium, copper, and zinc, respectively. Moreover, for oxine impregnated activated carbon, the kd values followed the sequence Cu 〉 Zn 〉 Cd which aggress well with the stability constants reported in the literature for the complexation of the three heavy metals with 8-Hydroxyquinoline.展开更多
In the present work, authors studied the interaction between carbohydrates as ligands such as L1： fructose, L2： glucose and L3： sucrose with metal（II） halides such as CuCl2, ZnCl2, SnCl2. Also authors compare the...In the present work, authors studied the interaction between carbohydrates as ligands such as L1： fructose, L2： glucose and L3： sucrose with metal（II） halides such as CuCl2, ZnCl2, SnCl2. Also authors compare the stability of the metal-ligand bond strength. DFT （density functional theory） was utilized using the B3LYP functional and the 6-31G（d） basis set. This level of calculation was used for optimization of geometry of ligands and exploring electronic properties such as ionization potential （I）, electron affinity （A）, chemical potential （μ）, hardness （η）, band gap （HOMO （highest occupied molecular orbital）-LUMO （lowest unoccupied molecular orbital））. The local reactivity was analyzed by the fukui function indices and the indices local of nucleophilicity in order to predict the sites of attack of carbohydrates. In addition, the strength of interaction has been evaluated by energy lowering and charge transfer using DFT at the B3LYP level employing the basis set Lan2DZ. As a result, the sequence of high stability of metal-ligand bond for ligands is in the following order; sucrose 〉 glucose 〉 fructose. Furthermore, the sequence of high stability for metal halides is in the following order, CuCl2 〉 SnCl2 〉 ZnCl2. We advise person who carries a dental amalgam do not exceed the consommation of monosaccharides, because their complexes are not sufficiently stable and hence these ions are not ejected easily outside the human body.展开更多
文摘The removal of cadmium, copper, and zinc from aqueous solution using activated carbon impregnated with 8-Hydroxyquinoline （oxine） was investigated in this study. The study was conducted using a completely mixed batch technique. Quantitative evaluation of the experimental results showed that the adsorption capacity of oxine impregnated activated carbon was higher than that of the virgin activated carbon for the three heavy metals. For oxine impregnated activated carbon, the Freundlieh distribution coefficient, kd , values were 23, 100, and 104 times larger than those of the virgin activated carbon for cadmium, copper, and zinc, respectively. Moreover, for oxine impregnated activated carbon, the kd values followed the sequence Cu 〉 Zn 〉 Cd which aggress well with the stability constants reported in the literature for the complexation of the three heavy metals with 8-Hydroxyquinoline.
文摘In the present work, authors studied the interaction between carbohydrates as ligands such as L1： fructose, L2： glucose and L3： sucrose with metal（II） halides such as CuCl2, ZnCl2, SnCl2. Also authors compare the stability of the metal-ligand bond strength. DFT （density functional theory） was utilized using the B3LYP functional and the 6-31G（d） basis set. This level of calculation was used for optimization of geometry of ligands and exploring electronic properties such as ionization potential （I）, electron affinity （A）, chemical potential （μ）, hardness （η）, band gap （HOMO （highest occupied molecular orbital）-LUMO （lowest unoccupied molecular orbital））. The local reactivity was analyzed by the fukui function indices and the indices local of nucleophilicity in order to predict the sites of attack of carbohydrates. In addition, the strength of interaction has been evaluated by energy lowering and charge transfer using DFT at the B3LYP level employing the basis set Lan2DZ. As a result, the sequence of high stability of metal-ligand bond for ligands is in the following order; sucrose 〉 glucose 〉 fructose. Furthermore, the sequence of high stability for metal halides is in the following order, CuCl2 〉 SnCl2 〉 ZnCl2. We advise person who carries a dental amalgam do not exceed the consommation of monosaccharides, because their complexes are not sufficiently stable and hence these ions are not ejected easily outside the human body.
