Green synthesized silver nanoparticles decorated on reduced graphene oxide for enhanced electrochemical sensing of nitrobenzene in waste water samples

Abstract

Journal Name RSCPublishing ARTICLE This journal isIn the present work, an electrochemical sensor for nitrobenzene has been developed based on green synthesized silver nanoparticles (AgNPs) decorated reduced graphene oxide (RGO) modified glassy carbon electrode (GCE). The AgNPs were synthesized using Justicia glauca leaf extract as a reducing and stabilizing agent. RGO-AgNPs composite modified electrode was prepared by a simple electrochemical reduction of AgNPs dispersed GO solution. FESEM of RGO-AgNPs composite confirms that AgNPs are firmly attached on the RGO sheets and the average size of AgNPs is found to be 40 ± 5 nm. The modified electrode shows good efficiency with lower overpotential for electrocatalytic reduction of NB than that of other modified electrodes (AgNPs and RGO). The DPV response confirms that the reduction peak current of NB is linear over the concentrations from 0.5 to 900 µM. The sensitivity of the sensors is found to be 0.836 µAµM -1 cm -2 with the detection limit of 0.261 µM for NB.In addition, the RGO-AgNPs composite modified electrode shows good selectivity in the presence of potentially interfering similar compounds and good practicality in the waste water samples.

Fabrication of Silver Nanoparticles Decorated on Activated Screen Printed Carbon Electrode and Its Application for Ultrasensitive Detection of Dopamine

“…The AgNPs were synthesized using Justicia glauca leaf extract as a biomaterial according to our previous report 28. Briefly, 50 mL of Justicia glauca leaf extract was mixed with 100 mL of aqueous solution of 1 mM AgNO 3 at room temperature.…”

“…The spectral values were recorded at 445, 452, 453 nm and it was indexed as S 1 , S 2 , S 3 , respectively. The SPR band of AgNPs is identical and not changed suggesting the formation of spherical shaped nanoparticles without much aggregation 28,29. The synthesized AgNPs were collected by centrifugation and washed several times with double distilled water.…”

Antimicrobial efficacy of green synthesized drug blended silver nanoparticles against dental caries and periodontal disease causing microorganisms

“…The AgNPs were synthesized using Justicia glauca leaf extract as a reducing agent according to our previous reported method [32,33]. …”

Improving Functional Behavior of MCM‐41 by Encapsulating MnO2 Nanorods towards Simultaneous Determination of Purine Bases in DNA Samples

“…Electrochemical impedance studies cater on the understanding of surface property changes of the modified electrodes. Incorporation of MnO 2 nanorods on MCM-41 enhances its conductivity [38][39][40][41]. Figure 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 decrease in peak to peak separation (160 mV) is observed in the case of GCE/MnO 2 (curve b) which justifies speeded electron transfer kinetics at GCE/MnO 2 as a result of improved electrical conductivity due to MnO 2 nanorods.…”

“…However, the results for MnO 2 @MCM-41 showed a midway response between that of only MCM-41 and MnO 2 . The higher frequency region encompassing the semicircular portion of the Nyquist plot, relates to the electron transfer process whereas the linear portion in the lower frequency accounts for the diffusion process [39,40]. Incorporation of MnO 2 nanorods on MCM-41 enhances its conductivity [38][39][40][41].…”