WS2/MoS2/graphene composite for the fast photocatalytic degradation of recalcitrant dyes and pharmaceuticals under solar light
Por:
Esquivel-Castro T.A., Ruíz-Baltazar A.D.J., Hernández-Del-Castillo P.C., Ojeda-Galván H.J., Acosta S., Quintana M., Rodríguez-González V., Oliva J.
Publicada:
1 ene 2026
Ahead of Print:
1 feb 2026
Resumen:
The performance of WS2-MoS2/graphene (WS2-MoS2/G) and WS2-MoS2 photocatalysts was evaluated for the degradation of recalcitrant methylene blue (MB, 40 ppm) and rhodamine B (RhB, 20 ppm) dyes as well as for the degradation of Fedrimin drug (composed by a mixture of ambroxol (AMB) + theophylline (THP), 20 ppm). The WS2-MoS2/G and WS2-MoS2 composites quickly degraded MB and RhB dyes with efficiencies > 99 % under solar light (after 10–15 min). If UV light is utilized for the photocatalytic degradation of RhB, efficiencies above 99 % are obtained, but longer time is needed (45 min). Furthermore, photocatalytic experiments were carried out for the degradation of Fedrimin and found that a higher degradation percentage is produced using the WS2-MoS2/G composite and sunlight (92 %) instead of UV light (78 %). In addition, hydroxyl radicals (•OH) were identified through scavenger tests as the main oxidizing species for the MB, RhB and Fedrimin degradation. Additionally, WS2-MoS2/G composite produced the maximum removal of total organic carbon (92 % for RhB and 96 % for MB) under solar light, indicating the efficient mineralization of the organic pollutants without the generation of byproducts. In general, WS2-MoS2/G composite had the highest absorbance in the visible region, which enhances electron transfer and delays the electron-hole recombination, improving the photocatalytic efficiency. Overall, the WS2-MoS2/G composite is a viable alternative for eliminating organic contaminants from water and could replace the conventional oxide based photocatalysts for the degradation of contaminants. Particularly, we demonstrated the degradation of a mixture of pharmaceuticals, which has been scarcely reported in the literature. © 2026 The Authors
Filiaciones:
División de Materiales Avanzados, Instituto Potosino de Investigación Científica y Tecnológica A.C., Camino a la presa San José 2055, Lomas 4a sección, San Luis Potosí, 78216, Mexico
SECIHTI - Centro de Física Aplicada y Tecnología Avanzada, Boulevard Juriquilla 3001, Querétaro, 76230, Mexico
Coordinación para la Innovación y la Aplicación de la Ciencia y la Tecnología (CIACYT), Universidad Autónoma de San Luis Potosí, Álvaro Obregón 64, San Luis Potosí, 78000, Mexico
Facultad de Ciencias, Universidad Autónoma de San Luis Potosí, San Luis Potosí, 78000, Mexico
Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Boulevard Juriquilla 3001, Querétaro, 76230, Mexico
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