Probe Sonicated Synthesis of Bismuth Oxide (Bi₂O₃): Photocatalytic Application and Electrochemical Sensing of Ascorbic Acid and Lead

Abstract

A simple and low-cost and highly calibrated probe sonication method was used to prepare bismuth oxide nanoparticles (Bi2O3 NPs). The formation of a well-crystalline sample at the end of the product has been further calcined at 600°C for 2 hrs. The powder X-ray diffraction (PXRD) patterns of the NPs substantiated the monoclinic structure (space group P21/c), and the average crystallite size was found to be 60 nm, which was also confirmed by transmission electron microscopic (TEM) studies. Scanning electron microscopic (SEM) images depicted highly porous Bi2O3 NPs with little agglomeration. Utilizing diffused reflectance spectra (DRS) data, the energy bandgap ( E g ) value of 3.3 eV was deduced for Bi2O3 NPs, and their semiconductor behavior has been confirmed. Two dyes, methylene blue (MB) and acid green (AG) were utilized for degradation studies using Bi2O3 NPs under UV light irradiation (from 0 to 120 min). The photocatalytic degradation was found to be maximum for MB (93.45%) and AR (97.80%) dyes. Cyclic voltammetric (CV) and sensor studies using the electrochemical impedance spectroscopy (EIS) were performed. The specific capacitance value of 25.5 Fg-1 was deduced from the cyclic voltammograms of the Bi2O3 electrode in 0.1 N HCl with a scan rate of 10 to 50 mV/s. From the obtained EIS data, the Bi2O3 electrode showed pseudocapacitive characteristics. The prepared electrodes also exhibited high sensitivity towards the detection of ascorbic acid and lead. Hence, sonochemically synthesized Bi2O3 NPs are possibly hopeful for excellent photocatalytic and electrochemical sensing of biomolecules.

Fuel‐dependent, shape‐selective, distinct blue and green photoluminescence from α‐Bi2O3 and β‐Bi2O3 synthesised using microwave combustion

“…Various methods for the synthesis of α-Bi 2 O 3 and β-Bi 2 O 3 have been reported in literature. These include direct precipitation [13][14][15][16][17], solution combustion [5,6,18,19], sol-gel synthesis [20][21][22][23], solvothermal calcination [8], chemical vapour decomposition [24,25], physical vapour deposition [26], microbial synthesis [27], flame spray pyrolysis [28], sonochemical synthesis [29][30][31], thermal synthesis [12], magnetron sputtering deposition [32], electrochemical synthesis [10,33] and solution microwave synthesis [34,35]. Most of these methods use strong acids and intensive processing conditions, making Aamir Bashir and Sriraj S. Mestry have contributed equally to this study.…”

Hydrothermal synthesis and characterization of nanostructured nickel vanadate for supercapacitor and photocatalytic applications

“…An identical procedure for irradiating an aqueous solution of F-OR in the presence of NiVO 3 results in a reduction in absorbance at various time intervals, as shown in figure 12(b). According to the findings, F-OR degrades by around 95% after 120 min of UV exposure, as indicated in table 4 [37,38]. NiVO 3 exhibited excellent catalytic performance at high concentrations of F-OR under UV light.…”

Structural, electrochemical sensor and photocatalytic activity of combustion synthesized of novel ZnO doped CuO NPs

“…This clearly shows that when exposed to UV radiation, CuO + 10% ZnO exhibited higher photocatalytic behaviour as a catalyst for the degradation of DG and FB dye. Our findings show the importance of the synthesis technique, crystal size, shape, and electron-hole recombination in the photocatalytic degradation of DG and FB dyes [57,58]. Equation The mechanism of photodegradation of dyes using as synthesized CuO@ZnO NC's can be described as follows.…”