Browsing by Author "Darshana Rajput"

Now showing 1 - 2 of 2

Application of Perovskite Oxides for Removal of Emerging Organic Pesticides
(Apple Academic Press, 2025) Darshana Rajput; Toshika Talele; Annika Durve Gupta; Divya Singh; José Herrera-Celis; L. G. Arriaga; Yunny Meas Vong; Goldie H. Oza
Pesticide residues in water bodies and soil are increasing at an alarming rate and are becoming a serious health hazard. Thus, efficient remediation technologies are necessary to convert these pollutants into their non-toxic forms. Perovskite oxides (POs) are a class of semiconductors well known for their photocatalytic activity and have drawn a lot of attention due to their numerous synthesis mechanisms, facile surface modification, abundance, and inexpensive cost. They possess many advantages, such as abundant oxygen vacancies, easily tunable structural morphology, stable crystal state, highly active metal sites, and a wide photo response range. Their thermal stability and catalytic properties make POs suitable candidates for the efficient cleanup of environmental pollutants. This chapter aims to provide an overview of the applications of POs towards pesticide remediation through adsorption and photocatalytic degradation. Current developments in the application of inorganic POs, such as lanthanum-based POs, rare earth metal-based POs, composites of POs and metal oxide nanoparticles, and metal-doped POs for pesticide removal are highlighted in this chapter. A detailed study of the photocatalytic mechanism of perovskite oxides, their composites, and their photocatalytic characteristics is also summarized in this chapter. © 2026 by Apple Academic Press, Inc.
Modulating temperature for Cu2ZnSnS4 (CZTS) synthesis via hot injection method and studying the photocatalytic efficiencies for the degradation of rhodamine 6G and methylene blue pollutants
(Academic Press Inc., 2024) Valentina Nava Murillo; Darshana Rajput; J. Manríquez; Erika Bustos; Jose de Jesus Perez Bueno; Divya Singh; Harish Dubey; Carlos Eduardo Frontana Vazquez; S. Godavarthi; Zakaryaa Zarhri; Fabrizio Olivito; Ashutosh Sharma; Pravin Jagdale; L.G. Arriaga; Clifford P Kubiak; Edilso Reguera; J.A. Diaz-Real; Goldie Oza
Cu2ZnSnS4 (CZTS) was synthesized following hot injection method and the process was optimized by varying temperature conditions. Four samples at different temperatures viz., 200, 250, 300 and 350 °C were prepared and analyzed using different characterization techniques. Based on the correlation between XRD, Raman and XPS, we conclude that the formation of ZnS and SnS2 occurs at 350 °C but at 200 °C there is no breakdown of the complex as per XRD. According to Raman and XPS analysis, as the temperature rises, the bonds between the metals become weaker, which is visibly seen in Raman and XPS due to the minor peaks of copper sulfide. Scanning electron microscopic analysis confirmed nanometric particles which increase in size with temperature. The photocatalytic evaluation showed that CZTS synthesized at 200 °C performed efficiently in the removal of the two colorants, methylene blue and Rhodamine 6G, achieving 92.80% and 90.65%, respectively. The photocatalytic degradation efficiencies decreased at higher temperatures due to bigger sized CZTS particles as confirmed by SEM results. Computational simulations confirm that CZTS has a highly negative energy −25,764 Ry, confirming its structural stability and higher covalent than ionic character. © 2024