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1999 Volume 16 Issue 3
1999, 16(3): 1-4
Abstract:
The effect of H2S on the inhibition action of propargyl alcohol(PA) in Fe/H2SO4 system has been investigated by electrochemical potentiodynamic and potentiostatic methods. The results showed that PA could inhibit the anodic and cathodic reactions of iron corrosion effectively in H2SO4 solution containing H2S. At low content of PA the inhibition efficiency decreased with the increase of H2S content due to the strong interaction of H2S and HS- with Fe. At high content of PA, Fe(HS-)ads is stabilized owing to the hydrogen bonds and electrostatic action, which made the anodic current approach to zero. The interaction between PA and Fe(H2S)ads in this case is weak.
The effect of H2S on the inhibition action of propargyl alcohol(PA) in Fe/H2SO4 system has been investigated by electrochemical potentiodynamic and potentiostatic methods. The results showed that PA could inhibit the anodic and cathodic reactions of iron corrosion effectively in H2SO4 solution containing H2S. At low content of PA the inhibition efficiency decreased with the increase of H2S content due to the strong interaction of H2S and HS- with Fe. At high content of PA, Fe(HS-)ads is stabilized owing to the hydrogen bonds and electrostatic action, which made the anodic current approach to zero. The interaction between PA and Fe(H2S)ads in this case is weak.
1999, 16(3): 5-8
Abstract:
A reactive carbon black having -OLi groups on its surface was prepared by using a reaction between oxygen-containing groups on carbon black surface and n-butyl lithium. The anionic graft copolymerization of styrene and acrylonitrile onto such a carbon black in the presence of polyoxyethylene-polyoxy propylene-polystyrene multiblock copolymer as initiation center has been investigated. FTIR and TEM observations confirmed the graft copolymerization.
A reactive carbon black having -OLi groups on its surface was prepared by using a reaction between oxygen-containing groups on carbon black surface and n-butyl lithium. The anionic graft copolymerization of styrene and acrylonitrile onto such a carbon black in the presence of polyoxyethylene-polyoxy propylene-polystyrene multiblock copolymer as initiation center has been investigated. FTIR and TEM observations confirmed the graft copolymerization.
1999, 16(3): 9-12
Abstract:
The lightly sulfonated poly (phenylene oxide)(SPPO) ionomers in DMSO/CHCl3 mixed solvents were emulsified by water to form a series of waterborne microemulsions. The effect of the solvent polarity on the phase inversion in the emulsion system has been investigated in relation to the conductivity, viscosity and surface tension of SPPO solution.
The lightly sulfonated poly (phenylene oxide)(SPPO) ionomers in DMSO/CHCl3 mixed solvents were emulsified by water to form a series of waterborne microemulsions. The effect of the solvent polarity on the phase inversion in the emulsion system has been investigated in relation to the conductivity, viscosity and surface tension of SPPO solution.
1999, 16(3): 13-16
Abstract:
Based on the isoelectric point property of enzyme and the doping principle of conducting polymers, xanthine oxidase from the fresh buttermilk has been immobilized and separated by polyaniline film and collected in the phosphate buffer. Xanthine oxidase in fresh buttermilk is doped into polyaniline film polymerized on a glassy carbon electrode to form enzyme electrode. This enzyme electrode has a good bioelctrochemical response to xanthine and a normally kinetic behavior in the enzyme-catalyzed reaction process. The optimum pH of the separated xanthine oxidase is 8.4, very close to that of the commercial xanthine oxidase in aqueous solutions.
Based on the isoelectric point property of enzyme and the doping principle of conducting polymers, xanthine oxidase from the fresh buttermilk has been immobilized and separated by polyaniline film and collected in the phosphate buffer. Xanthine oxidase in fresh buttermilk is doped into polyaniline film polymerized on a glassy carbon electrode to form enzyme electrode. This enzyme electrode has a good bioelctrochemical response to xanthine and a normally kinetic behavior in the enzyme-catalyzed reaction process. The optimum pH of the separated xanthine oxidase is 8.4, very close to that of the commercial xanthine oxidase in aqueous solutions.
1999, 16(3): 17-20
Abstract:
A novel water soluble near-IR cyanine dye(HMC) was synthesized and its structure was characterized by NMR and MS. The absorption and fluorescence spectral characteristics of HMC in aqueous solution were also studied. It was found that in acidic solution of HMC the presence of protein could cause a hypochromic effect at 776 nm, that was used as a probe for the determination of total protein in human serum. The low fluorescence of in situ HMC dimer caused by cationic surfactant CTAB has been tested as a probe for nucleic acid determination.
A novel water soluble near-IR cyanine dye(HMC) was synthesized and its structure was characterized by NMR and MS. The absorption and fluorescence spectral characteristics of HMC in aqueous solution were also studied. It was found that in acidic solution of HMC the presence of protein could cause a hypochromic effect at 776 nm, that was used as a probe for the determination of total protein in human serum. The low fluorescence of in situ HMC dimer caused by cationic surfactant CTAB has been tested as a probe for nucleic acid determination.
1999, 16(3): 21-24
Abstract:
The corrosion behavior of electroless Ni-P deposits on the carbon steel in deaerated 35%NaOH solution have been studied by potentiodynamic polarization method, electrochemical impedance spectroscopy(EIS) technique and atomic force microscopy(AFM). The results showed that the anodic polarization behavior of the Ni-P deposit with high P content were very similar to that of low P deposit, but the corrosion current densities of the high P deposit were much lower than that of the low P deposit. The low phosphorus deposit exhibited a rounded-mound structure surrounded by fairly deep crevices and the size of the nodules varied from 0.1~0.5 μm, the depth of the crevices was about 10~20 nm. The high phosphorus deposit exhibited a more uniform and smoother surface structure, the size of the nodules was smaller and the depth of the crevices was approximately 2~5 nm.
The corrosion behavior of electroless Ni-P deposits on the carbon steel in deaerated 35%NaOH solution have been studied by potentiodynamic polarization method, electrochemical impedance spectroscopy(EIS) technique and atomic force microscopy(AFM). The results showed that the anodic polarization behavior of the Ni-P deposit with high P content were very similar to that of low P deposit, but the corrosion current densities of the high P deposit were much lower than that of the low P deposit. The low phosphorus deposit exhibited a rounded-mound structure surrounded by fairly deep crevices and the size of the nodules varied from 0.1~0.5 μm, the depth of the crevices was about 10~20 nm. The high phosphorus deposit exhibited a more uniform and smoother surface structure, the size of the nodules was smaller and the depth of the crevices was approximately 2~5 nm.
1999, 16(3): 25-28
Abstract:
The extraction equilibria of Cd(Ⅱ), Co(Ⅱ) and Ni(Ⅱ) using a Naphtezol M solution containing bis(2-ethylhexyl) phosphonic acid(PIA-8,HL) have been investigated in 1.0 mol/L (NH4)2SO4 (298 K). The oligomerization number, stoichiometry and conditional extraction constants of the extracted species were determined. The results indicated that the metal ions as monomeric species: CdL2·3HL and CdL2·4HL for Cd(Ⅱ), CoL2·HL and CoL2·3HL for Co(Ⅱ), and NiL2·3HL and NiL2·5HL for Ni(Ⅱ) were extracted into Naphtezol M phase.
The extraction equilibria of Cd(Ⅱ), Co(Ⅱ) and Ni(Ⅱ) using a Naphtezol M solution containing bis(2-ethylhexyl) phosphonic acid(PIA-8,HL) have been investigated in 1.0 mol/L (NH4)2SO4 (298 K). The oligomerization number, stoichiometry and conditional extraction constants of the extracted species were determined. The results indicated that the metal ions as monomeric species: CdL2·3HL and CdL2·4HL for Cd(Ⅱ), CoL2·HL and CoL2·3HL for Co(Ⅱ), and NiL2·3HL and NiL2·5HL for Ni(Ⅱ) were extracted into Naphtezol M phase.
1999, 16(3): 29-32
Abstract:
The solvent, e.g. turpentine oil, remained on the surface of the MH electrode using SBS as binder was dissolved out after dipping into butanone and the electrode behavior especially the rate dischargeability and the activation were improved significantly. Electrochemical measurements showed that the dipping increased electrochemical catalysis activity and diffusion coefficient of the MH electrode, but decreased its electrochemical reaction resistance.
The solvent, e.g. turpentine oil, remained on the surface of the MH electrode using SBS as binder was dissolved out after dipping into butanone and the electrode behavior especially the rate dischargeability and the activation were improved significantly. Electrochemical measurements showed that the dipping increased electrochemical catalysis activity and diffusion coefficient of the MH electrode, but decreased its electrochemical reaction resistance.
1999, 16(3): 33-36
Abstract:
Active carbons with high adsorbability have been prepared from different raw materials by 3 activation methods: cyclic activation and activation with KOH or ZnCl2 solution. Product CA58# obtained from carbonized copra shell after 58 cyclic activations showed the best property: porosize distribution 0.8~2.0 nm, packing density 0.5410 g/mL, specific surface 2759 m2/g, effective absorbance 81.3 mg/g. (cyclic activation at 0.1~3.7 MPa). The effect of temperature on the adsorption isotherms of active carbon towards methane at pressure ranged from 0 to 5.0 MPa has been investigated. A hysteresis was observed on the adsorption and desorption isotherms. The specific surface and packing density are considered to be the most important characters for the adsorbent.
Active carbons with high adsorbability have been prepared from different raw materials by 3 activation methods: cyclic activation and activation with KOH or ZnCl2 solution. Product CA58# obtained from carbonized copra shell after 58 cyclic activations showed the best property: porosize distribution 0.8~2.0 nm, packing density 0.5410 g/mL, specific surface 2759 m2/g, effective absorbance 81.3 mg/g. (cyclic activation at 0.1~3.7 MPa). The effect of temperature on the adsorption isotherms of active carbon towards methane at pressure ranged from 0 to 5.0 MPa has been investigated. A hysteresis was observed on the adsorption and desorption isotherms. The specific surface and packing density are considered to be the most important characters for the adsorbent.
1999, 16(3): 37-40
Abstract:
Six antigenic peptides of 26ku glutathione S-transferase, Sj26, of Schistosoma japonicum have been predicted according to its hydrophilicity, flexibility, accessibility, charge distribution and β-turn in the secondary structure and synthesized. All of them showed good antigenicities by Dot-ELISA method with anti-Schistosoma japonicumim-immunoglobulin polyclonal antibody, anti-Sj-IgG PcAb. One also showed a good antigenicity for the anti-Schistosoma surface membrane monoclonal antibody, A6McAb. Two of them showed good protection rates in mouse. They would be as candidate peptides for synthetic peptide vaccine against schistosomiasis.
Six antigenic peptides of 26ku glutathione S-transferase, Sj26, of Schistosoma japonicum have been predicted according to its hydrophilicity, flexibility, accessibility, charge distribution and β-turn in the secondary structure and synthesized. All of them showed good antigenicities by Dot-ELISA method with anti-Schistosoma japonicumim-immunoglobulin polyclonal antibody, anti-Sj-IgG PcAb. One also showed a good antigenicity for the anti-Schistosoma surface membrane monoclonal antibody, A6McAb. Two of them showed good protection rates in mouse. They would be as candidate peptides for synthetic peptide vaccine against schistosomiasis.
1999, 16(3): 41-44
Abstract:
Five quaternary mixed anion complexes of lanthanide [Ln(CH3COO)2(NO3)(bipy)]2 (Ln=Pr,Nd,Sm,Eu,Gd), were synthesized and studied by IR, UV, DTA-TG, fluorescence spectrum and ESR measurements. It belongs to triclinic system with space group P1, a=0.8329(1) nm, b=0.8975(1) nm, c=1.2837(1),α=109.85(1)°, β=104.35(1)°, γ=99.15(1)°, V=0.8426(4) nm3, Z=2, Mr=477.19, Dc=1.881 g/cm, μ=2.921 mm-1, F(000)=468. The four acetates have two coordinated modes. Two acetates are bridged and the others are trio-coordinate.
Five quaternary mixed anion complexes of lanthanide [Ln(CH3COO)2(NO3)(bipy)]2 (Ln=Pr,Nd,Sm,Eu,Gd), were synthesized and studied by IR, UV, DTA-TG, fluorescence spectrum and ESR measurements. It belongs to triclinic system with space group P1, a=0.8329(1) nm, b=0.8975(1) nm, c=1.2837(1),α=109.85(1)°, β=104.35(1)°, γ=99.15(1)°, V=0.8426(4) nm3, Z=2, Mr=477.19, Dc=1.881 g/cm, μ=2.921 mm-1, F(000)=468. The four acetates have two coordinated modes. Two acetates are bridged and the others are trio-coordinate.
1999, 16(3): 45-48
Abstract:
Polyethylene film with hydrotalcite, the layered double hydroxide containing magnesium and aluminum, as thermal insulating filler has been prepared and characterized by techniques of X-ray powder diffractometry, scanning electronic micrography, infrared spectrophotometry and thermal analysis and mechnical tests. Such a filled PE film shows an obviously greater adsorption of infrared light than the common talc containing PE film with other properties being unchanged.
Polyethylene film with hydrotalcite, the layered double hydroxide containing magnesium and aluminum, as thermal insulating filler has been prepared and characterized by techniques of X-ray powder diffractometry, scanning electronic micrography, infrared spectrophotometry and thermal analysis and mechnical tests. Such a filled PE film shows an obviously greater adsorption of infrared light than the common talc containing PE film with other properties being unchanged.
1999, 16(3): 49-52
Abstract:
Three bismaleimide oligomers were synthesized from N,N-bismaleiminodiphenylmethane, N,N-bismaleiminodiphenylether, and N,N-bismaleiminodiphenoxydime thylsilane with ethyleneglycol rosin ester as chain extender. The compounds have been characterized by FTIR, 1H NMR and elemental analysis.
Three bismaleimide oligomers were synthesized from N,N-bismaleiminodiphenylmethane, N,N-bismaleiminodiphenylether, and N,N-bismaleiminodiphenoxydime thylsilane with ethyleneglycol rosin ester as chain extender. The compounds have been characterized by FTIR, 1H NMR and elemental analysis.
1999, 16(3): 53-56
Abstract:
Polystyrene(PS) and polyethylene(LDPE, HDPE, LLDPE) have been blended by reactive extrusion in the presence of dicumyl peroxide(DCP). The melt flow rate values showed that PE macromolecular radicals mainly experienced coupling reaction with each other, while PS preferred degradation, giving rise to chain scission. Addition of polyfunctional monomers during the extrusion could retard the degradation of PS. The results of solvent extraction, IR and DSC measurements of the blends showed that DCP and trihydroxymethylpropane trimethylacrylic acid together could induce an interfacial grafting of PS and PE, that promoted the compatibility of PS/LLDPE blend.
Polystyrene(PS) and polyethylene(LDPE, HDPE, LLDPE) have been blended by reactive extrusion in the presence of dicumyl peroxide(DCP). The melt flow rate values showed that PE macromolecular radicals mainly experienced coupling reaction with each other, while PS preferred degradation, giving rise to chain scission. Addition of polyfunctional monomers during the extrusion could retard the degradation of PS. The results of solvent extraction, IR and DSC measurements of the blends showed that DCP and trihydroxymethylpropane trimethylacrylic acid together could induce an interfacial grafting of PS and PE, that promoted the compatibility of PS/LLDPE blend.
1999, 16(3): 57-61
Abstract:
A series of thermotropic shish-kebab type liquid crystalline copolymers two mesogenic units were synthesized via solution polycondensation from 4,4'-(α,ω-octanedioyloxy) dibenzoyl dichloride, 2,5-bis[(4-hexadecoxybenzoyl)oxy] hydroquinone and 4,4'-bis(β-hydroxyethyloxy) biphenyl. The copolymers were characterized by GPC, DSC, TG, WAXD and polarizing microscope with heating stage. It was found that all the copolymers went to liquid crystal phase when heated to their melting point. The broken focal-conic texture or marble texture were observed. Both melting and isotropization temperatures showed a regular change with variation of the hydroquinone unit content in the copolymer.
A series of thermotropic shish-kebab type liquid crystalline copolymers two mesogenic units were synthesized via solution polycondensation from 4,4'-(α,ω-octanedioyloxy) dibenzoyl dichloride, 2,5-bis[(4-hexadecoxybenzoyl)oxy] hydroquinone and 4,4'-bis(β-hydroxyethyloxy) biphenyl. The copolymers were characterized by GPC, DSC, TG, WAXD and polarizing microscope with heating stage. It was found that all the copolymers went to liquid crystal phase when heated to their melting point. The broken focal-conic texture or marble texture were observed. Both melting and isotropization temperatures showed a regular change with variation of the hydroquinone unit content in the copolymer.
1999, 16(3): 62-66
Abstract:
Barium and bismuth doped λ-MnO2 were prepared and their electrochemical performances in 9 mol/L NaOH solution were investigated by XRD, constant current charge/discharge, cyclic voltammtry techniques. The results show that the Ba-doped λ-MnO2 has a better discharge and rechargeability than the undoped λ-MnO2 and the Bi-doped λ-MnO2 also has a greater discharge capacity than the undoped one.
Barium and bismuth doped λ-MnO2 were prepared and their electrochemical performances in 9 mol/L NaOH solution were investigated by XRD, constant current charge/discharge, cyclic voltammtry techniques. The results show that the Ba-doped λ-MnO2 has a better discharge and rechargeability than the undoped λ-MnO2 and the Bi-doped λ-MnO2 also has a greater discharge capacity than the undoped one.
1999, 16(3): 67-70
Abstract:
The colloidal liquid aphrons(CLA) have been prepared. Their sizes and viscosities are mainly affected by the phase volume ratio(PVR). It is found that the stable CLA system capsulated with N1923 or TBP and the CLA with P507 show a good extraction ability for acetic acid and rare earth ions (Y3+, Nd3+, Yb3+), respectively.
The colloidal liquid aphrons(CLA) have been prepared. Their sizes and viscosities are mainly affected by the phase volume ratio(PVR). It is found that the stable CLA system capsulated with N1923 or TBP and the CLA with P507 show a good extraction ability for acetic acid and rare earth ions (Y3+, Nd3+, Yb3+), respectively.
1999, 16(3): 71-72
Abstract:
Ten 1-aryl-2,5-dimethyl-3,4-diacetylpyrroles were synthesized by reaction of 3,4-diacetyl-2,5-hexanedione with substituted phenylamine in acid medium. The structures of all compounds were confirmed by IR, 1H NMR and high resolution MS.
Ten 1-aryl-2,5-dimethyl-3,4-diacetylpyrroles were synthesized by reaction of 3,4-diacetyl-2,5-hexanedione with substituted phenylamine in acid medium. The structures of all compounds were confirmed by IR, 1H NMR and high resolution MS.
1999, 16(3): 73-75
Abstract:
Tetra(4-hydroxyphenyl) porphyrin(THPPH2) was synthesized by condensation of 4-hydroxybenzaldehyde and pyrrole in DMF using anhydrous AlCl3 as catalyst without neccessity to use inert gas for protection. Its nickel complex(THPPNi) and Ni meso-tetra(4-benzoxyphenyl) porphyrin(TBOPPNi), Ni meso-tetra[4-(carboxymethylenoxy)phenyl] porphyrin(TCMOPPNi) were also prepared. Their structures were ascertained by elemental analysis, visible spectrum, IR and 1H NMR measurements. The electrochemical property of TCMOPPNi has been investigated in DMSO by cyclic voltammetry and differential pulse voltammetry.
Tetra(4-hydroxyphenyl) porphyrin(THPPH2) was synthesized by condensation of 4-hydroxybenzaldehyde and pyrrole in DMF using anhydrous AlCl3 as catalyst without neccessity to use inert gas for protection. Its nickel complex(THPPNi) and Ni meso-tetra(4-benzoxyphenyl) porphyrin(TBOPPNi), Ni meso-tetra[4-(carboxymethylenoxy)phenyl] porphyrin(TCMOPPNi) were also prepared. Their structures were ascertained by elemental analysis, visible spectrum, IR and 1H NMR measurements. The electrochemical property of TCMOPPNi has been investigated in DMSO by cyclic voltammetry and differential pulse voltammetry.
1999, 16(3): 76-78
Abstract:
The separation of In(Ⅲ) Ga(Ⅲ) and Zn(Ⅱ) in sulfuric acid solution by CL-P204 levetrel resin has been studied. In(Ⅲ) was separated at first from the solution by absorbing at 10 mol/L. Ga(Ⅲ) and Zn(Ⅱ) were separated together by absorbing at pH=2.5, then isolated from each other by stripping with HCl. The recoveries of three metal ions were good.
The separation of In(Ⅲ) Ga(Ⅲ) and Zn(Ⅱ) in sulfuric acid solution by CL-P204 levetrel resin has been studied. In(Ⅲ) was separated at first from the solution by absorbing at 10 mol/L. Ga(Ⅲ) and Zn(Ⅱ) were separated together by absorbing at pH=2.5, then isolated from each other by stripping with HCl. The recoveries of three metal ions were good.
1999, 16(3): 79-81
Abstract:
Using Cu(Ⅱ) as template and ethylene glycol bisglycidyl ether as crosslinking agent, a novel adsorption resin of chitosan condensed with salicylaldehyde has been synthesized. Its static adsorption capacity, kinetic and isothermal curves for Cu(Ⅱ) have been obtained. The adsorption capacity of the resin for Cu(Ⅱ) was 177.78 mg/g and selectivity coefficient KCu(Ⅱ)/Fe(Ⅱ) was 4.6, both much greater than that of resin without being treated by template. The resin cna be reused after simple regeneration.
Using Cu(Ⅱ) as template and ethylene glycol bisglycidyl ether as crosslinking agent, a novel adsorption resin of chitosan condensed with salicylaldehyde has been synthesized. Its static adsorption capacity, kinetic and isothermal curves for Cu(Ⅱ) have been obtained. The adsorption capacity of the resin for Cu(Ⅱ) was 177.78 mg/g and selectivity coefficient KCu(Ⅱ)/Fe(Ⅱ) was 4.6, both much greater than that of resin without being treated by template. The resin cna be reused after simple regeneration.
1999, 16(3): 82-84
Abstract:
SnCl4 was first used for catalytical synthesis of dibutyl o-phthal ate. Esterification ratio of 95.3% was achieved in conditions: n(o-phthalic anhydride)/n(n-butanol)=1/2.4, SnCl4 2.58%, 60 min.
SnCl4 was first used for catalytical synthesis of dibutyl o-phthal ate. Esterification ratio of 95.3% was achieved in conditions: n(o-phthalic anhydride)/n(n-butanol)=1/2.4, SnCl4 2.58%, 60 min.
1999, 16(3): 85-87
Abstract:
Polyacrylamide type flocculants have been used in the secondary removal of silicon in preparation of high-purity zirconium oxychloride. Under optimum conditions of the process 98.9% and more silicon was removed and the silicon content in final product was ≤0.0005%.
Polyacrylamide type flocculants have been used in the secondary removal of silicon in preparation of high-purity zirconium oxychloride. Under optimum conditions of the process 98.9% and more silicon was removed and the silicon content in final product was ≤0.0005%.
1999, 16(3): 88-90
Abstract:
Aphid pheromone and its four analogues were successfully synthesized by organic cuprate reaction of (E)-6,10-dimethyl-5,9-undecadien-1-yne.
Aphid pheromone and its four analogues were successfully synthesized by organic cuprate reaction of (E)-6,10-dimethyl-5,9-undecadien-1-yne.
1999, 16(3): 91-93
Abstract:
Yakuchinone-A, a natural compound with strong gingery flavor, has been synthesized starting from vanillin in five steps with 60% overall yield.
Yakuchinone-A, a natural compound with strong gingery flavor, has been synthesized starting from vanillin in five steps with 60% overall yield.
1999, 16(3): 94-96
Abstract:
Temperature programmed oxidation combined with mass-spectrometry(TPO-MS) technique has been used to investigate the burning of carbon deposited on the Co/Al2O3 catalysts during reforming of methane with CO2. Obvious coke and carbon deposition sites were found on the 13%Co/Al2O3, while on the 8%Co/Al2O3 only coke deposition site. The total amount of carbon and coke deposites was much greater on the surface of 13%Co/Al2O3. It is considered the reason that 13%Co/Al2O3 catalyst showed better catalytic activity and stability than the other one.
Temperature programmed oxidation combined with mass-spectrometry(TPO-MS) technique has been used to investigate the burning of carbon deposited on the Co/Al2O3 catalysts during reforming of methane with CO2. Obvious coke and carbon deposition sites were found on the 13%Co/Al2O3, while on the 8%Co/Al2O3 only coke deposition site. The total amount of carbon and coke deposites was much greater on the surface of 13%Co/Al2O3. It is considered the reason that 13%Co/Al2O3 catalyst showed better catalytic activity and stability than the other one.
1999, 16(3): 97-99
Abstract:
Perovskite LaCoO3 prepared from La(NO3)3 and Co(NO3)2 in citrate acid solution showed an effective catalytic decolouration property to several dyes in aqueous suspension solution under light.
Perovskite LaCoO3 prepared from La(NO3)3 and Co(NO3)2 in citrate acid solution showed an effective catalytic decolouration property to several dyes in aqueous suspension solution under light.
1999, 16(3): 100-102
Abstract:
The electrochemical and spectroelectrochemical behavior of 7-nitro-5,10,15,20-tetraphenylporphyrin, (NO2)TPPH2 and its complexes (NO2)TPPM, M=Zn(Ⅱ), Cu(Ⅱ) have been studied by cyclic voltammetry and in situ UV-Vis spectrochemistry in dichloromethane. By cyclic voltammetry the compounds underwent four reversible reduction and oxidation steps, the redox process involved only the porphyrin π system. A mechanism of redox reaction has been proposed and confirmed by UV-Vis spectrum measurements.
The electrochemical and spectroelectrochemical behavior of 7-nitro-5,10,15,20-tetraphenylporphyrin, (NO2)TPPH2 and its complexes (NO2)TPPM, M=Zn(Ⅱ), Cu(Ⅱ) have been studied by cyclic voltammetry and in situ UV-Vis spectrochemistry in dichloromethane. By cyclic voltammetry the compounds underwent four reversible reduction and oxidation steps, the redox process involved only the porphyrin π system. A mechanism of redox reaction has been proposed and confirmed by UV-Vis spectrum measurements.
1999, 16(3): 103-105
Abstract:
Nanoparticles of α-MnO2 were prepared by one-step solid state redox reaction at room temperature or 60℃. The solid state reaction was studied by XRD and TEM observation. It is shown that the time of grinding directly affected the crystalline type of the products from amorphous MnO2 to unstable δ-MnO2 and stable α-MnO2. The reaction rate of KMnO4 with MnCl2·4H2O was greater than that with Mn(Ac)2·H2O. The dischrge capacity of α-MnO2 nanoparticles was larger than that of International Common Sample No.1 electrolytic MnO2 especially in heavy load discharge.
Nanoparticles of α-MnO2 were prepared by one-step solid state redox reaction at room temperature or 60℃. The solid state reaction was studied by XRD and TEM observation. It is shown that the time of grinding directly affected the crystalline type of the products from amorphous MnO2 to unstable δ-MnO2 and stable α-MnO2. The reaction rate of KMnO4 with MnCl2·4H2O was greater than that with Mn(Ac)2·H2O. The dischrge capacity of α-MnO2 nanoparticles was larger than that of International Common Sample No.1 electrolytic MnO2 especially in heavy load discharge.
1999, 16(3): 106-108
Abstract:
A novel biphenol monomer, 4-(3-chloro-4-hydroxy-phenyl)-2,3-phthalazine-1-one, was used to synthesize a thermalstable engineering plastic with 4,4-difluorodiphenylketone. Its inherent viscosity is 66 mL/g(C6H5Cl,25℃). The polymer is soluble in chloroform, N-methylpyrrolidone, nitrobenzene, s-tetrachloroethane with Tg1=267℃. The monomers and polymer have been studied by 1H NMR and FTIR.
A novel biphenol monomer, 4-(3-chloro-4-hydroxy-phenyl)-2,3-phthalazine-1-one, was used to synthesize a thermalstable engineering plastic with 4,4-difluorodiphenylketone. Its inherent viscosity is 66 mL/g(C6H5Cl,25℃). The polymer is soluble in chloroform, N-methylpyrrolidone, nitrobenzene, s-tetrachloroethane with Tg1=267℃. The monomers and polymer have been studied by 1H NMR and FTIR.
1999, 16(3): 109-111
Abstract:
Hemoglobin has been successfully immobilized on a polymer carrier, polyalbumin-starch system via introduced polyethylene glycol as a spacer. Hemoglobin in this case still has a capacity for carrying oxygen.
Hemoglobin has been successfully immobilized on a polymer carrier, polyalbumin-starch system via introduced polyethylene glycol as a spacer. Hemoglobin in this case still has a capacity for carrying oxygen.
1999, 16(3): 112-113
Abstract:
The inclusion interaction between chrysophanol and hydroxypropyl- and carboxylmethyl-β-cyclodextrins has been studied by phase solubility method. The formation constants showed that the solubility of the chrysophanol was enhanced by inclusion.
The inclusion interaction between chrysophanol and hydroxypropyl- and carboxylmethyl-β-cyclodextrins has been studied by phase solubility method. The formation constants showed that the solubility of the chrysophanol was enhanced by inclusion.
1999, 16(3): 114-115
Abstract:
Four title Schiff bases have been synthesized and characterized.
Four title Schiff bases have been synthesized and characterized.
