[en] The reactions of the ligands; antipyrine-4-azo-5(3,5-dimethyl pyrazole) (L¹) (1 mol) and antipyrine-4-azo-5(3,5-dimethyl-1-phenyl pyrazole) (L²) (1 mol) with potassium chloropalladate (K₂PdCl₄) and ruthenium(III) chloride (1 mol) in EtOH produce complexes of the type PdLCl₂ and RuLCl₃ where L=L¹ or L². The ligands antipyrine-4-azo-5(3-methyl pyrazolone) (HL³) and antipyrine-4-azo-5(3-methyl-1-phenyl pyrazolone) (HL⁴) (1 mol) react with 1 mol of K₂PdCl₄, and RuCl₃·3 H₂O in EtOH to yield the complexes PdLCl and RuLCl₂. The IR spectral data show that L¹ and L² behave as neutral bidentate ligands in hydrazo-form, whereas HL³ and HL⁴ behave as mono basic tridentate ligands in the enolazo form. The electronic spectra and magnetic measurements reveal that Pd(II) complexes exhibit square planar structures. The IR and magnetic data show also that Ru(III) complexes are dimers. The complexes were characterized by elemental analyses, conductance, spectral and magnetic susceptibility measurements. (author). 25 refs, 2 tabs

[en] Palladium(II), iron(III) and ruthenium(III) chloride of antipyrine-4-azo-2-(5,5-dimethyl-1,3-cyclohexane dione) (HL) were prepared and characterized using analytical, spectral and magnetic measurements. The analytical and spectral data show that the reactions of K₂PdCl₄ (1 mol) in distilled water, FeCl₃·6H₂O and RuCl₃·3H₂O(1 mol) in ethanol with HL (1 mol) in ethanol produce 1:1 metal complexes. The studies reveal also that the ligand behaves as a neutral bidentate in its hydrazo form when reacting with palladium(II) and as a mono basic tridentate in its azo form when reacting with trivalent iron and ruthenium. The magnetic susceptibility shows that the palladium complex is diamagnetic, iron(III) is consistent with a high spin d⁵ configuration and ruthenium(III) is a low spin d⁵. Cyclic voltammetry of the complexes in a acetonitrile at a platinum electrode has been performed. The iron and ruthenium complexes show quasi reversible waves corresponding to Fe^III/Fe^IV and Ru^III/Ru^IV redox processes respectively. (author). 28 refs, 2 figs, 3 tabs

[en] Graphene oxide/chitosan/zirconiumphosphate/silicate (GO/CS/ZrP/Si) as a novel nano-composite has highly adsorption of ¹³⁴Cs, ⁶⁰Co, ^152,154Eu and ¹⁶⁰Tb. The GO/CS/ZrP/Si has better adsorption of ^152,154Eu and ¹⁶⁰Tb. A comparison of the adsorption kinetics and isotherms were analyzed using different models. The adsorption data was fitting with the pseudo second-order and the Langmuir isotherm. The changes in Gibbs free energy ΔGo), enthalpy (ΔHo), and entropy (ΔSo) have been calculated. Selective adsorption of lanthanide ions from monazite solution was achieved. The break through capacities of Sm³⁺, La³⁺, Eu³⁺ and Tb³⁺ on GO/CS/ZrP/Si were found as 14.5, 13.0, 14.8 and 14.9 mg/g respectively. (author)

[en] To avert excessive sulfuric acid exhaustion in the classical leaching procedure and to avoid leaching of other undesirable impurities, proper alkaline leaching has been achieved for dolostone of Gabal Allouga, South western Sinai, Egypt. The relevant factors for alkaline leaching of a technological sample assaying 1.2% Cu and 0.15% U were examined using a mixture of Na₂CO₃/(NH₄)HCO₃ solution upon two samples namely; roasted sample at 540 ° C and raw materials un-roasted. The leaching kinetic results showed that the leaching procedure of uranium and copper from dolostoneis controlled by shrinking core kinetic model 1-2/3(X)−(1−X)^2/3=k_dt