A novel thermally induced graft polymerization technique was used to modify a polyvinylidene fluoride （PVDF） hollow fibre microfiltration membrane. An artificial neural network （ANN） was applied to optimize the pr...A novel thermally induced graft polymerization technique was used to modify a polyvinylidene fluoride （PVDF） hollow fibre microfiltration membrane. An artificial neural network （ANN） was applied to optimize the prepared condition of the membrane. The optimized dosing of acrylic acid （AA）, acrylamide （AM）, N, N＇- methylenebisacrylamide （NMBA） and potassium persulphate （KSP） designed by ANN was that AA was 40.63 ml/L; AM acted as 6.25 g/L; NMBA was 1.72 g/L and KSP was 1.5 g/L, respectively. The thermal stability of the PVDF modified hollow fibre membrane （PVDF-PAA） was investigated by thermogravimetric （TG） and differential scanning calorimetry （DSC） analysis. The polycrystallinity of the PVDF-PAA membrane was evaluated by X-ray diffraction （XRD） analysis. The complex formation of the modified membrane was ascertained by Fourier transform infrared spectroscopy （FTIR）. The morphology of the PVDF-PAA membrane was studied by environmental scanning electron microscopy （ESEM）. The surface compositions of the membrane were analyzed by X-ray photoelectron spectroscopy （XPS）. The adsorption capacity of Cu^2＋ ion on the PVDF-PAA hollow fibre membrane was also investigated.展开更多
It is essential to screen novel luminophores and co-reactants for the development of electrochemiluminescence(ECL)systems.In this work,a series of 1,8-naphthalimide-modified graphitic carbon nitride(CN/1,8-NDI_(x))ECL...It is essential to screen novel luminophores and co-reactants for the development of electrochemiluminescence(ECL)systems.In this work,a series of 1,8-naphthalimide-modified graphitic carbon nitride(CN/1,8-NDI_(x))ECL luminophores were successfully developed for the quantitative determination of Cu^(2+)with K_(2)S_(2)O_(8)as a co-reactant.When CN/1,8-NDI_(x)was immobilized on the surface of the glassy carbon electrode(GCE),a strong ECL signal could be produced(at a potential of-1.3 V vs.Ag/AgCl),which was threefold stronger than that of unmodified g-C_(3)N_(4).The intensity of ECL could be linearly quenched by Cu^(2+)over a concentration range from 5×10^(-9)to 1×10^(-4)mol/L,and with a low limit of detection(LOD)of0.86 nmol/L.Our results may provide a new perspective on the novel ECL platforms development.展开更多
文摘A novel thermally induced graft polymerization technique was used to modify a polyvinylidene fluoride （PVDF） hollow fibre microfiltration membrane. An artificial neural network （ANN） was applied to optimize the prepared condition of the membrane. The optimized dosing of acrylic acid （AA）, acrylamide （AM）, N, N＇- methylenebisacrylamide （NMBA） and potassium persulphate （KSP） designed by ANN was that AA was 40.63 ml/L; AM acted as 6.25 g/L; NMBA was 1.72 g/L and KSP was 1.5 g/L, respectively. The thermal stability of the PVDF modified hollow fibre membrane （PVDF-PAA） was investigated by thermogravimetric （TG） and differential scanning calorimetry （DSC） analysis. The polycrystallinity of the PVDF-PAA membrane was evaluated by X-ray diffraction （XRD） analysis. The complex formation of the modified membrane was ascertained by Fourier transform infrared spectroscopy （FTIR）. The morphology of the PVDF-PAA membrane was studied by environmental scanning electron microscopy （ESEM）. The surface compositions of the membrane were analyzed by X-ray photoelectron spectroscopy （XPS）. The adsorption capacity of Cu^2＋ ion on the PVDF-PAA hollow fibre membrane was also investigated.
基金financially supported by the National Natural Science Foundation of China(22172011,22078049)
文摘It is essential to screen novel luminophores and co-reactants for the development of electrochemiluminescence(ECL)systems.In this work,a series of 1,8-naphthalimide-modified graphitic carbon nitride(CN/1,8-NDI_(x))ECL luminophores were successfully developed for the quantitative determination of Cu^(2+)with K_(2)S_(2)O_(8)as a co-reactant.When CN/1,8-NDI_(x)was immobilized on the surface of the glassy carbon electrode(GCE),a strong ECL signal could be produced(at a potential of-1.3 V vs.Ag/AgCl),which was threefold stronger than that of unmodified g-C_(3)N_(4).The intensity of ECL could be linearly quenched by Cu^(2+)over a concentration range from 5×10^(-9)to 1×10^(-4)mol/L,and with a low limit of detection(LOD)of0.86 nmol/L.Our results may provide a new perspective on the novel ECL platforms development.
