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Fabrication of potato-like silver molybdate microstructures for photocatalytic degradation of chronic toxicity ciprofloxacin and highly selective electrochemical detection of H 2 O 2

View Article: PubMed Central - PubMed

ABSTRACT

In the present work, potato-like silver molybdate (Ag2MoO4) microstructures were synthesized through a simple hydrothermal method. The microstructures of Ag2MoO4 were characterized by various analytical and spectroscopic techniques such as XRD, FTIR, Raman, SEM, EDX and XPS. Interestingly, the as-prepared Ag2MoO4 showed excellent photocatalytic and electrocatalytic activity for the degradation of ciprofloxacin (CIP) and electrochemical detection of hydrogen peroxide (H2O2), respectively. The ultraviolet-visible (UV-Vis) spectroscopy results revealed that the potato-like Ag2MoO4 microstructures could offer a high photocatalytic activity towards the degradation of CIP under UV-light illumination, leads to rapid degradation within 40 min with a degradation rate of above 98%. In addition, the cyclic voltammetry (CV) and amperometry studies were realized that the electrochemical performance of Ag2MoO4 modified electrode toward H2O2 detection. Our H2O2 sensor shows a wide linear range and lower detection limit of 0.04–240 μM and 0.03 μM, respectively. The Ag2MoO4 modified electrode exhibits a high selectivity towards the detection of H2O2 in the presence of different biological interferences. These results suggested that the development of potato-like Ag2MoO4 microstructure could be an efficient photocatalyst as well as electrocatalyst in the potential application of environmental, biomedical and pharmaceutical samples.

No MeSH data available.


Electrochemical impedance spectroscopy of different modified electrodes (a) bare GCE (b) Ag2MoO4 modified GCE in 0.1 M KCl solution containing 5 mM [Fe(CN)6]3−/4−.
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f6: Electrochemical impedance spectroscopy of different modified electrodes (a) bare GCE (b) Ag2MoO4 modified GCE in 0.1 M KCl solution containing 5 mM [Fe(CN)6]3−/4−.

Mentions: Electrochemical impedance spectroscopy (EIS) was used to investigate the changes of the electrode surface during the fabrication process. The nyquist curves of the EIS spectra was observed using bare GCE (a) and Ag2MoO4 modified GCE (b) in 0.1 M KCl containing 5.0 mM K3Fe(CN)6/K4Fe(CN)6 (Fig. 6). The diameter of the semicircle indicates the electron transfer resistance (Rct) of the electrode. This resistance controls the electron transfer kinetics of redox probe at the electrode interface. From the EIS results, the Ag2MoO4 modified GCE (b) shows larger semicircle than bare GCE (a) reveals that the Ag2MoO4 modified GCE can increase the electron transfer resistance on electrode surface, because it is hindered the electron transfer of K3Fe(CN)6/K4Fe(CN)6, thus confirming the successful modification of Ag2MoO4 on the GCE surface.


Fabrication of potato-like silver molybdate microstructures for photocatalytic degradation of chronic toxicity ciprofloxacin and highly selective electrochemical detection of H 2 O 2
Electrochemical impedance spectroscopy of different modified electrodes (a) bare GCE (b) Ag2MoO4 modified GCE in 0.1 M KCl solution containing 5 mM [Fe(CN)6]3−/4−.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5037444&req=5

f6: Electrochemical impedance spectroscopy of different modified electrodes (a) bare GCE (b) Ag2MoO4 modified GCE in 0.1 M KCl solution containing 5 mM [Fe(CN)6]3−/4−.
Mentions: Electrochemical impedance spectroscopy (EIS) was used to investigate the changes of the electrode surface during the fabrication process. The nyquist curves of the EIS spectra was observed using bare GCE (a) and Ag2MoO4 modified GCE (b) in 0.1 M KCl containing 5.0 mM K3Fe(CN)6/K4Fe(CN)6 (Fig. 6). The diameter of the semicircle indicates the electron transfer resistance (Rct) of the electrode. This resistance controls the electron transfer kinetics of redox probe at the electrode interface. From the EIS results, the Ag2MoO4 modified GCE (b) shows larger semicircle than bare GCE (a) reveals that the Ag2MoO4 modified GCE can increase the electron transfer resistance on electrode surface, because it is hindered the electron transfer of K3Fe(CN)6/K4Fe(CN)6, thus confirming the successful modification of Ag2MoO4 on the GCE surface.

View Article: PubMed Central - PubMed

ABSTRACT

In the present work, potato-like silver molybdate (Ag2MoO4) microstructures were synthesized through a simple hydrothermal method. The microstructures of Ag2MoO4 were characterized by various analytical and spectroscopic techniques such as XRD, FTIR, Raman, SEM, EDX and XPS. Interestingly, the as-prepared Ag2MoO4 showed excellent photocatalytic and electrocatalytic activity for the degradation of ciprofloxacin (CIP) and electrochemical detection of hydrogen peroxide (H2O2), respectively. The ultraviolet-visible (UV-Vis) spectroscopy results revealed that the potato-like Ag2MoO4 microstructures could offer a high photocatalytic activity towards the degradation of CIP under UV-light illumination, leads to rapid degradation within 40 min with a degradation rate of above 98%. In addition, the cyclic voltammetry (CV) and amperometry studies were realized that the electrochemical performance of Ag2MoO4 modified electrode toward H2O2 detection. Our H2O2 sensor shows a wide linear range and lower detection limit of 0.04–240 μM and 0.03 μM, respectively. The Ag2MoO4 modified electrode exhibits a high selectivity towards the detection of H2O2 in the presence of different biological interferences. These results suggested that the development of potato-like Ag2MoO4 microstructure could be an efficient photocatalyst as well as electrocatalyst in the potential application of environmental, biomedical and pharmaceutical samples.

No MeSH data available.