Published in Chemical Papers
For the first time in this work, 4-amino-3-hydrazino-5-mercapto-1,2,4-triazole (Purpald®) polymer film on the surfaces of disposable pencil graphite electrodes (PGEs) were successfully electrosynthesized. The optimized conditions of electropolymerization of Purpald® film were also investigated. Electrochemical deposition was carried out by cyclic v...
Published in Chemical Papers
Triterpenic methylketones, known earlier and obtainable as a result of oxidative transformation of double bond(s) in 2-cyano-3,4-secoderivatives of the lupane and 18αH-oleanane types, can be regarded as promising intermediates for synthetic transformation. This study has demonstrated the acid-catalyzed α-bromination of methylketones as capable of p...
Published in Chemical Papers
Fluorocarbon surfactants are a key ingredient of aqueous film-forming foam (AFFF) extinguishing agent. As is well known, the most widely used fluorocarbon surfactants are perfluorooctane sulfonates (PFOS) and theirs derivatives. However, PFOS has been restricted due to its drawbacks such as toxicity, bio-accumulation and resistance to biodegradatio...
Published in Chemical Papers
A series of Mo/ZSM-5 catalysts prepared by solid-state ion exchange at different Mo/Al molar ratios were characterized and tested in ethane and ethylene ammoxidation into acetonitrile. It has been concluded that the low-exchanged solid (Mo/Al = 0.2) stabilized MoO3, [Mo2O7]2− and [Mo7O24]6− species. However, besides these species, the solids prepar...
Published in Chemical Papers
Lu(OH)CO3:Ln3+/LuBO3:Ln3+ (Ln = Eu, Tb) nanospheres have been synthesized by the soft chemistry route. This synthesis process does not require the addition of any organic solvents and surfactant. The whole process consists of homogeneous precipitation and hydrothermal process. First, uniform spherical Lu(OH)CO3:Ln3+ (Ln = Eu, Tb) nanoparticles with...
Published in Chemical Papers
Noncovalent dimer and trimer adducts obtained from interaction of nido-C4B2H6 with one and two HF molecules were investigated at MP2/aug-cc-pVTZ computational method. In the trimer adducts, two types of geometrical structures were observed. In one kind, no interaction occurred among HF molecules, while in the other ones HF molecules affected the cl...
Published in Chemical Papers
The polymer of m-phenylenediamine (poly(m-PDA)) which was synthesized by mild laccase catalysis in an aqueous buffer (10 mM citrate phosphate, pH 3) was investigated for the adsorption of several heavy metal ions including Pb2+, Cu2+, Co2+, and Cr3+. In the preliminary study for the adsorption of Pb2+ by poly(m-PDA), the adsorbed amount of Pb2+ was...
Published in Chemical Papers
In this study, natural gas sweetening using the amine–membrane hybrid process was investigated by economic evaluation. The Amine–membrane hybrid system consists of a membrane section applied to reduce the bulk flow acid gases followed by the amine section to enhance gas quality. Membrane feed pretreatment operation is also considered to approach th...
Published in Chemical Papers
A new Schiff base extractant, O-[1-(2-pyridylimino) ethyl] phenol (PEPh), was synthesized to separate and pre-concentrate U(VI) ions from carbonate solution prior to its spectrophotometric determination. Various instrumental techniques such as elemental analysis, FTIR, and 1H NMR analysis were employed for full characterization of the synthetic ext...
Published in Chemical Papers
Acid–base activity, keto-enol tautomerism and complexing properties of 6-bromoquercetin are investigated in water media under different conditions. The constants of dissociation (pKa) have been determined in pH region at various ionic strengths. The analysis of the protonation process is conducted in strongly acidic solutions of HCl. The complexati...
