Abstract The oxidation of oxalic acid by the potassium tetrabromoaurate(III) in 0.005≤ [H2C2O4]≤0.07 mol dm-3 is studied by UV spectrophotometry in the temperature range of 293.2 – 313.2 K. Under pseudo-first-order conditions ([H2C2O4]0 ≥10[Au(III)]0), it is first order in [Au(III)] and [H2C2O4]. Both H+and Br– retard the reaction. The reactive species for Au(III) is AuBr3(H2O). A mechanism for this reaction […]

Read More → Kinetics and mechanism of the oxidation of oxalic acid by potassium yetrabromoaurate(III)

Abstract Poly(L-lactic acid) (PLLA) of high molecular weight was prepared by chain extending reaction in a micro-compounder. Phosphites were used as chain extenders to increase the molecular weight of the PLLA prepolymer that was prepared by bulk polycondensation of L-lactic acid. Effects of the amount of the phosphite, temperature and the screw speed were studied on […]

Read More → Preparation and characterization of high molecular weight poly(L-lactic acid) by chain extending

Abstract The Salen-copper(II) complex was synthesized by diffusion. The structure was characterized by single crystal X-ray diffraction. It crystallized in triclinic system,pB1spacegroup,with a=9.3441(18)Å, b=11.478(3)Å, c=12.320(3)Å, a=81.584(11)°, b=74.681(9)°, g=68.206(9), MolecularFormula: C23H19CuN5O8, M=397.86, V=1181.6(5)Å3, z=2, Dc=1.56Mg/m3, R1=0.0416, wR2=0.1236,I>[2s/(I)]. The crystal included a mononuclear complex [Cu(H2L)(DMF)] and a non-coordinated H2O molecular. Keyword diaminomaleontrile;5-carboxylsalicylaldehyde;crystal structure Synthesis and Crystal Structure of a New Salen-Copper (II) Complex Li Lijun, Yang […]

Read More → Synthesis and crystal structure of a novel Salen-copper(II) complex

Abstracts d- MnO2 was prepared with hydrothermal treatment, and its crystalline structure was verified with X-ray diffraction spectroscopy. FTIR showed there were copious hydroxyl groups on the surface of d-MnO2 for the adsorption. The adsorption capacity of three kinds of heavy metal ions Pb2+, Cd2+ and Cu2+ on the d-MnO2 was all increased with the increase of ion concentration and the increase of […]

Read More → Adsorption and competitive adsorption of heavy metal ions lead, cadmium and copper on d-manganese oxide

Abstract A new biflavonoid, 5,7,4′,5”-tetrahydroxy-7”-metroxy-[3-O-4”’] biflavone along with four known biflavonoids and one known phenolic acid was isolated from the herb of Selaginella uncinata(Desv.) Spring. Their structures were elucidated by spectroscopic methods. Keywords Selaginella uncinata;5,7,4′,5”-tetrahydroxy-7”-metroxy-[3-O-4”’] biflavone INTRODUCTION Selaginella uncinata(Desv.) Spring as a medicinal plant is used to treat acute infectious jaundice hepatitis, cholecystitis, enteritis and so on.In previous investigations of […]

Read More → A new biflavonoid from Selaginella uncinata (Desv.) Spring

The Sepharose CL-6B was used as an affinity chromatography column to purify and analyze the lectin in ginkgo biloba seeds. Coagulation experiment and comparison with the lectins present in ricinus and in seeds of bitter gourd explained that lectin in ginkgo biloba seeds was a protein with Only one subunit, which was similar to the galactose-specific […]

Read More → Purification and analysis of lectin in ginkgo biloba seeds

Abstract Kinetics’ and Thermodynamics of The Adsorption of of Ni 2+ Onto Chitosan-Aluminum Composite Material’s WAS Studied oxide. The Under Experimental Conditions, s Indicated Kinetic Adsorption of that of Ni 2+ Onto Aluminum oxide-Chitosan Composite Material’s Conforms to pseudo-SECOND-Order Equation And the apparent adsorption activation energy is 28.62 kJ/mol.In the experimental temperature, thermodynamic studies indicated that adsorption of Ni 2+ onto chitosan-aluminium […]

Read More → Kinetic and thermodynamic studies on the adsorption of Ni 2+ onto chitosan-aluminium oxide composite material

Abstract The kinetics and mechanism of ruthenium(III) catalyzed oxidation of isobutyl alcohol(IBA) by cerium(IV) in sulfuric acid media has been investigated by titrimetric technique of redox in the temperature range of 298-313K. It is found that the reaction is first-order with respect to Ce(IV) and Ru(III), and a positive fractional order with respect to IBA. It […]

Read More → Kinetics and mechanism of ruthenium(III) catalyzed oxidation of isobutyl alcohol by cerium(IV) in acid medium

Abstract Adsorptive stripping method for the determination of resorcinol on multi-walled carbon nanotube modified glassy carbon electrode (MWNT-GCE) was developed. Cyclic voltammetry was used in the study of the electrochemical behavior of resorcinol on MWNT-GCE. The sharp peak of resorcinol appeared at 0.6 V (vs. Ag/AgCl) with the differential pulse voltammetry (DPV). The experimental parameters were […]

Read More → Determination of resorcinol on glassy carbon electrode modified by carbon nanotube and its application in wastewater analysis

Abstract In this paper diethoxy-acrylamide methoxyl thiophosphate (DAMT) was synthesized with the reaction N-hydroxymethyl acrylamide and O, O-diethyl phosphorochloridothioate catalyzed by cuprous chloride in presence of triethylamine, and the flame retarded poly (DAMT-co-acrylonitrile) was obtained though free-radically copolymerized process. The properties of copolymer were estimated by Limiting Oxygen Index (LOI) values and thermogravimetric analysis (TGA). The […]

Read More → Synthesis and characterization of Fire retarded poly (DAMT -co-acrylonitrile)