Abstract
In this study, plant extract obtained from pods of Millettia pinnata plant species was employed for nanosynthesis of Bi2O3. The as-synthesized semiconductor metal oxide nanoparticles were analyzed using various characterization tools such as X-ray diffraction (XRD), Scanning electron microscope (SEM), ultra violet-visible (UV–Vis), Fourier transform infrared (FTIR), Zeta potential, Raman, and X-ray photoelectron spectroscopy (XPS). The characterization results designate the formation of α and β forms of Bi2O3. FESEM images demonstrate rod and flake-like nanostructures ranging from 25 to 70 nm. The green synthesized nanomaterial was found efficient for reduction of 4-nitro phenol (4-NP) and 4-nitro aniline (4-NA). However, it showed better performance toward the reduction of 4-NA. Photocatalytic investigations demonstrated that the green synthesized nanophotocatalyst was capable in degrading Amido Black 10B (AB-10B) dye efficiently under visible light illumination. 98.83% degradation of AB-10B dye was achieved within 120 min of irradiation under optimum conditions of photocatalyst dose and dye concentration. Active species trapping experiments revealed prominent role of superoxide radicals (•O2−) while hydroxyl radicals (•OH) played considerable role in the AB-10B photocatalytic degradation process. Moreover, the photostability and reusability assessment study ascertained good performance of the catalyst after four runs of successive cycles.
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Acknowledgements
The authors are indebted to the Department of Chemistry, University of Rajasthan, Jaipur (India) for infrastructural support. The technical assistance provided by MRC, MINT campus, Jaipur and CAF, Manipal University, Jaipur (India) for this study is also acknowledged here. J.K.S. is thankful to the CSIR-India for fellowship.
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Ajay Kumar Surela, Jitednra Kumar, and Lata Kumari Chhachhia. The first draft of the manuscript was written by Ajay Kumar Surela and original draft was corrected by Parmeshwar Lal Meena, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Meena, P.L., Surela, A.K., Saini, J.K. et al. Millettia pinnata plant pod extract-mediated synthesis of Bi2O3 for degradation of water pollutants. Environ Sci Pollut Res 29, 79253–79271 (2022). https://doi.org/10.1007/s11356-022-21435-z
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DOI: https://doi.org/10.1007/s11356-022-21435-z