In this study,green zinc oxide(ZnO)/polypyrrole(Ppy)/cellulose acetate(CA)film has been synthesized via solvent casting.This film was used as supporting material for glucose oxidase(GOx)to sensitize a glucose biosenso...In this study,green zinc oxide(ZnO)/polypyrrole(Ppy)/cellulose acetate(CA)film has been synthesized via solvent casting.This film was used as supporting material for glucose oxidase(GOx)to sensitize a glucose biosensor.ZnO nanoparticles have been prepared via the green route using olive leaves extract as a reductant.ZnO/Ppy nanocomposite has been synthesized by a simple in-situ chemical oxidative polymerization of pyrrole(Py)monomer using ferric chloride(FeCl3)as an oxidizing agent.The produced materials and the composite films were characterized using X-ray diffraction analysis(XRD),scanning electron microscope(SEM),Fourier transform infrared(FTIR)and thermogravimetric analysis(TGA).Glucose oxidase was successfully immobilized on the surface of the prepared film and then ZnO/Ppy/CA/GOx composite was sputtered with platinum electrode for the current determination at different initial concentrations of glucose.Current measurements proved the suitability and the high sensitivity of the constructed biosensor for the detection of glucose levels in different samples.The performance of the prepared biosensor has been assessed by measuring and comparing glucose concentrations up to 800 ppm.The results affirmed the reliability of the developed biosensor towards real samples which suggests the wide-scale application of the proposed biosensor.展开更多
With demand increasing for phosphate recovery,a considerable share of current research is dedicated to elaborate multifunctional materials.In this way,the objective of this work was to produce hybrid films from the co...With demand increasing for phosphate recovery,a considerable share of current research is dedicated to elaborate multifunctional materials.In this way,the objective of this work was to produce hybrid films from the combination of cellulose acetate(CA)biopolymer and magnesium and aluminium layered double hydroxides(LDHs)and investigate their performance for phosphate recovery.In this work,the following materials were prepared and characterized:LDH,calcinated LDH(LDH-c),CA film(CAF),CA film with LDH(CAF-LDH)and CA film with LDH-c(CAF-LDH-c).The produced materials were characterized by X-ray diffraction,thermogravimetric analysis coupled with differential scanning calorimetry and mass spectrometry,attenuated total reflectance Fourier transform infrared spectroscopy and scanning electronic microscopy.The thickness,H2O absorption(AH2O),stability in H2O and phosphate adsorption of the produced films were evaluated.The adsorption capacity of films was compared to LDHs in powder form.The CAF-LDH and CAF-LDH-c increased film thickness,where CAF-LDH-c was thicker than CAF-LDH.CAF-LDH-c had higher AH2O than the other films,because of its increased thickness and mainly because of the H2O sorption process of these materials.H2O stability of 98.97%for CAF-LDH and 96.81%for CAF-LDH-c suggest the produced films can maintain their structural properties even after a long contact period with aqueous solutions.For the CAF-LDH-c,the maximum adsorption capacity of phosphate,according to the Langmuir-Freundlich model,was 6.98 mg/g.The adsorption value suggests that this film can be used as an efficient phosphorus(P)adsorbent from wastewater or a eutrophicated source.展开更多
文摘In this study,green zinc oxide(ZnO)/polypyrrole(Ppy)/cellulose acetate(CA)film has been synthesized via solvent casting.This film was used as supporting material for glucose oxidase(GOx)to sensitize a glucose biosensor.ZnO nanoparticles have been prepared via the green route using olive leaves extract as a reductant.ZnO/Ppy nanocomposite has been synthesized by a simple in-situ chemical oxidative polymerization of pyrrole(Py)monomer using ferric chloride(FeCl3)as an oxidizing agent.The produced materials and the composite films were characterized using X-ray diffraction analysis(XRD),scanning electron microscope(SEM),Fourier transform infrared(FTIR)and thermogravimetric analysis(TGA).Glucose oxidase was successfully immobilized on the surface of the prepared film and then ZnO/Ppy/CA/GOx composite was sputtered with platinum electrode for the current determination at different initial concentrations of glucose.Current measurements proved the suitability and the high sensitivity of the constructed biosensor for the detection of glucose levels in different samples.The performance of the prepared biosensor has been assessed by measuring and comparing glucose concentrations up to 800 ppm.The results affirmed the reliability of the developed biosensor towards real samples which suggests the wide-scale application of the proposed biosensor.
文摘With demand increasing for phosphate recovery,a considerable share of current research is dedicated to elaborate multifunctional materials.In this way,the objective of this work was to produce hybrid films from the combination of cellulose acetate(CA)biopolymer and magnesium and aluminium layered double hydroxides(LDHs)and investigate their performance for phosphate recovery.In this work,the following materials were prepared and characterized:LDH,calcinated LDH(LDH-c),CA film(CAF),CA film with LDH(CAF-LDH)and CA film with LDH-c(CAF-LDH-c).The produced materials were characterized by X-ray diffraction,thermogravimetric analysis coupled with differential scanning calorimetry and mass spectrometry,attenuated total reflectance Fourier transform infrared spectroscopy and scanning electronic microscopy.The thickness,H2O absorption(AH2O),stability in H2O and phosphate adsorption of the produced films were evaluated.The adsorption capacity of films was compared to LDHs in powder form.The CAF-LDH and CAF-LDH-c increased film thickness,where CAF-LDH-c was thicker than CAF-LDH.CAF-LDH-c had higher AH2O than the other films,because of its increased thickness and mainly because of the H2O sorption process of these materials.H2O stability of 98.97%for CAF-LDH and 96.81%for CAF-LDH-c suggest the produced films can maintain their structural properties even after a long contact period with aqueous solutions.For the CAF-LDH-c,the maximum adsorption capacity of phosphate,according to the Langmuir-Freundlich model,was 6.98 mg/g.The adsorption value suggests that this film can be used as an efficient phosphorus(P)adsorbent from wastewater or a eutrophicated source.
