Cyclic voltammetric behavior of electrooxidation of Mn(Ⅱ) under ultrasound and without ultrasound were compared. With the ultrasound irradiation the reduction peak potential of Pb(Ⅳ)/ Pb(Ⅱ) was found shifted negati...Cyclic voltammetric behavior of electrooxidation of Mn(Ⅱ) under ultrasound and without ultrasound were compared. With the ultrasound irradiation the reduction peak potential of Pb(Ⅳ)/ Pb(Ⅱ) was found shifted negatively about 0.14 V, initial electrolytic potential reduced 0.2 V and reduction peak current increased. At the same conditions,the conversion of Mn(Ⅱ) was increased. The optimum conditions for electrooxidation were 0.3 mol/L solution of Mn(Ⅱ), 6 mol/L H 2SO 4, electrolysis potential 2.3 V and 44 W ultrasound.展开更多
Three complexes of Mn（Ⅱ）with L-amino acid[L-Isoleucine（L-Ile）,L-Methionine（L-Met）,L-Tryptophan（L-Trp）]were synthesized and characterized by elemental analysis,infrared spectra and gravithem metrical analyses....Three complexes of Mn（Ⅱ）with L-amino acid[L-Isoleucine（L-Ile）,L-Methionine（L-Met）,L-Tryptophan（L-Trp）]were synthesized and characterized by elemental analysis,infrared spectra and gravithem metrical analyses.The catalytic activity of the three complexes for disproportionation of O2-was determined by NBT method.The result shows that the complexes have a high SOD-like activity,and the KQ values of complexes 1,2 and 3 are 0.78×107mol-1·L·s-1,1.28×107mol-1,and 1.50×107mol-1L·s-1,respectively.展开更多
The electrochemical behavior of Mn (Ⅲ)/Mn(Ⅱ)ion-pair on platinum electrode in acid media were studied by cyclic voltammetry.It was demonstrated that the redox process of Mn(Ⅲ)/Mn(Ⅱ) pair was a simple pseudo-revers...The electrochemical behavior of Mn (Ⅲ)/Mn(Ⅱ)ion-pair on platinum electrode in acid media were studied by cyclic voltammetry.It was demonstrated that the redox process of Mn(Ⅲ)/Mn(Ⅱ) pair was a simple pseudo-reversible one-electron reaction between Mn(Ⅲ) and Mn(Ⅱ).The electrochemical kinetics of the redox reaction on static Pt electrode was a mass transfer controlled one.The calculated diffusion coefficient of Mn(Ⅱ) was 1.48×10 -6cm 2/s.展开更多
文摘Cyclic voltammetric behavior of electrooxidation of Mn(Ⅱ) under ultrasound and without ultrasound were compared. With the ultrasound irradiation the reduction peak potential of Pb(Ⅳ)/ Pb(Ⅱ) was found shifted negatively about 0.14 V, initial electrolytic potential reduced 0.2 V and reduction peak current increased. At the same conditions,the conversion of Mn(Ⅱ) was increased. The optimum conditions for electrooxidation were 0.3 mol/L solution of Mn(Ⅱ), 6 mol/L H 2SO 4, electrolysis potential 2.3 V and 44 W ultrasound.
文摘Three complexes of Mn（Ⅱ）with L-amino acid[L-Isoleucine（L-Ile）,L-Methionine（L-Met）,L-Tryptophan（L-Trp）]were synthesized and characterized by elemental analysis,infrared spectra and gravithem metrical analyses.The catalytic activity of the three complexes for disproportionation of O2-was determined by NBT method.The result shows that the complexes have a high SOD-like activity,and the KQ values of complexes 1,2 and 3 are 0.78×107mol-1·L·s-1,1.28×107mol-1,and 1.50×107mol-1L·s-1,respectively.
文摘The electrochemical behavior of Mn (Ⅲ)/Mn(Ⅱ)ion-pair on platinum electrode in acid media were studied by cyclic voltammetry.It was demonstrated that the redox process of Mn(Ⅲ)/Mn(Ⅱ) pair was a simple pseudo-reversible one-electron reaction between Mn(Ⅲ) and Mn(Ⅱ).The electrochemical kinetics of the redox reaction on static Pt electrode was a mass transfer controlled one.The calculated diffusion coefficient of Mn(Ⅱ) was 1.48×10 -6cm 2/s.
