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V. Maurino kindly acknowledges funding by Regione Piemonte, Italy, through the project ECOBRAKE "Studio e Sviluppo di materiali frenanti ecologici e a bassa emissione di particolato per applicazioni automotive"-L.R. 34/2004-D.D. n degrees 409 del 02/11/2021. D. Hermosilla is grateful to Grant PID2020-114918RB-I00 (Project PHOTOPREBIO) funded by MCIN/AEI/10.13039/501100011033. MA Iqbal is grateful for the support of the European project UNA4CAREER (Marie Sk & lstrok;odowska Curie grant No 847635).

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From Anatase TiO2 Nano-Cuboids to Nano-Bipyramids: Influence of Particle Shape on the TiO2 Photocatalytic Degradation of Emerging Contaminants in Contrasted Water Matrices

Publicado en:Molecules. 30 (2): 424- - 2025-01-01 30(2), DOI: 10.3390/molecules30020424

Autores: Asghar, Humaira; Hermosilla, Daphne; Pellegrino, Francesco; Muelas-Ramos, Virginia; de los Rios, Christian; Gasco, Antonio; Maurino, Valter; Iqbal, Muhammad Ahsan

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Resumen

Water pollution, resulting from industrial effluents, agricultural runoff, and pharmaceutical residues, poses serious threats to ecosystems and human health, highlighting the need for innovative approaches to effective remediation, particularly for non-biodegradable emerging pollutants. This research work explores the influence of shape-controlled nanocrystalline titanium dioxide (TiO2 NC), synthesized by a simple hydrothermal method, on the photodegradation efficiency of three different classes of emerging environmental pollutants: phenol, pesticides (methomyl), and drugs (sodium diclofenac). Experiments were conducted to assess the influence of the water matrix on treatment efficiency by using ultrapure water and stormwater (basic) collected from an urban drainage system as matrices. The size and shape of the nano-cuboids were accurately controlled during synthesis to assess their impact on photoactivity and selectivity. Regarding total organic carbon removal using TiO2 nano-cuboids in basic environments, the results were particularly remarkable. TiO2 nano-cuboids and truncated bipyramids synthesized in the 200-250 degrees C temperature range showed an enhanced photocatalytic efficiency when compared to alternative formulations. Diclofenac, methomyl, and phenol were fully mineralized from ultrapure water and basic stormwater. The TiO2 nano-cuboids/nano-bipyramids demonstrated better selectivity and photoactivity in comparison to irregular TiO2 nanoparticles. The differences in photoactivity and selectivity are explained in terms of charge carrier separation and trapping on the different crystal facets. Their performance demonstrates their potential as sustainable materials for the photodegradation of emerging pollutants in various water matrices.

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