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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

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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.


Amperometric i–t responses of H2O2 reduction at Ag2MoO4 film modified RDGCE upon successive additions of H2O2 from 0.04 to 247 μM into continuously stirred N2 saturated 0.05 M PBS (pH 7). Applied potential: −0.5 V; Rotation rate: 1200 rpm. Inset shows the calibration plot of response current vs. H2O2 concentration [0.04–240 μM].
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f10: Amperometric i–t responses of H2O2 reduction at Ag2MoO4 film modified RDGCE upon successive additions of H2O2 from 0.04 to 247 μM into continuously stirred N2 saturated 0.05 M PBS (pH 7). Applied potential: −0.5 V; Rotation rate: 1200 rpm. Inset shows the calibration plot of response current vs. H2O2 concentration [0.04–240 μM].

Mentions: The amperometric i-t technique is one of the most important method to determine the electrocatalytic activity of modified electrodes in electrochemical sensor and biosensor applications. In the present work, we have utilized an amperometric method to estimate the performance of Ag2MoO4 modified GCE toward H2O2 detection. In this regards, Ag2MoO4 modified rotating disc glassy carbon electrode (RDGCE) was performed in continuously stirred pH 7 solution by applying constant potential at −0.5 V with rotation speed at 1200 rpm. Figure 10 reveals the amperometric i-t performance obtained at Ag2MoO4 modified RDGCE upon the different addition of H2O2 (0.049 to 247 μM) in the PBS solution. These results undoubtedly shows that Ag2MoO4 modified film demonstrates a fast and well-defined response obtained in each different addition of H2O2 concentration. The response time of H2O2 detection on Ag2MoO4 modified RDGCE was observed for 5 s, it’s clearly suggesting that the fast electron movement process was occurred in the electrolyte and electrode interface when introducing the H2O2. The linear response current increases with increasing the concentration of H2O2 (low concentration to high concentration) from 0.049 to 240 μM (linear range inset; Fig. 10), the obtained sensitivity and limit of detection (LOD) of the sensor is around 9.8 μAμM−1 cm−2 and 0.03 μM, respectively. The above results suggesting that the Ag2MoO4 modified RDGC electrode has good electrocatalytic activity towards H2O2. The analytical parameters, such as LOD, linear range, and sensitivity, of H2O2 sensor was compared with various modified electrodes are summarized in Table 1. Clearly, the Ag2MoO4 modified RDGCE, reported here, exhibits good sensitivity and LOD over a wide linear range of H2O2 concentration compared to other reports6263646566676869707172737475.


Fabrication of potato-like silver molybdate microstructures for photocatalytic degradation of chronic toxicity ciprofloxacin and highly selective electrochemical detection of H 2 O 2
Amperometric i–t responses of H2O2 reduction at Ag2MoO4 film modified RDGCE upon successive additions of H2O2 from 0.04 to 247 μM into continuously stirred N2 saturated 0.05 M PBS (pH 7). Applied potential: −0.5 V; Rotation rate: 1200 rpm. Inset shows the calibration plot of response current vs. H2O2 concentration [0.04–240 μM].
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Related In: Results  -  Collection

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getmorefigures.php?uid=PMC5037444&req=5

f10: Amperometric i–t responses of H2O2 reduction at Ag2MoO4 film modified RDGCE upon successive additions of H2O2 from 0.04 to 247 μM into continuously stirred N2 saturated 0.05 M PBS (pH 7). Applied potential: −0.5 V; Rotation rate: 1200 rpm. Inset shows the calibration plot of response current vs. H2O2 concentration [0.04–240 μM].
Mentions: The amperometric i-t technique is one of the most important method to determine the electrocatalytic activity of modified electrodes in electrochemical sensor and biosensor applications. In the present work, we have utilized an amperometric method to estimate the performance of Ag2MoO4 modified GCE toward H2O2 detection. In this regards, Ag2MoO4 modified rotating disc glassy carbon electrode (RDGCE) was performed in continuously stirred pH 7 solution by applying constant potential at −0.5 V with rotation speed at 1200 rpm. Figure 10 reveals the amperometric i-t performance obtained at Ag2MoO4 modified RDGCE upon the different addition of H2O2 (0.049 to 247 μM) in the PBS solution. These results undoubtedly shows that Ag2MoO4 modified film demonstrates a fast and well-defined response obtained in each different addition of H2O2 concentration. The response time of H2O2 detection on Ag2MoO4 modified RDGCE was observed for 5 s, it’s clearly suggesting that the fast electron movement process was occurred in the electrolyte and electrode interface when introducing the H2O2. The linear response current increases with increasing the concentration of H2O2 (low concentration to high concentration) from 0.049 to 240 μM (linear range inset; Fig. 10), the obtained sensitivity and limit of detection (LOD) of the sensor is around 9.8 μAμM−1 cm−2 and 0.03 μM, respectively. The above results suggesting that the Ag2MoO4 modified RDGC electrode has good electrocatalytic activity towards H2O2. The analytical parameters, such as LOD, linear range, and sensitivity, of H2O2 sensor was compared with various modified electrodes are summarized in Table 1. Clearly, the Ag2MoO4 modified RDGCE, reported here, exhibits good sensitivity and LOD over a wide linear range of H2O2 concentration compared to other reports6263646566676869707172737475.

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.