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Sulfur precursor and citric acid effect on SnS2 nanoparticles and their influence on the photodegradation activity of selected organic compounds

Abstract

Semiconductor nanoparticle-mediated photocatalysis is an attractive option for water decontamination, being the semiconductors as SnS2 with a bandgap in the visible region, the most promising materials. In the present work, we evaluated the influence of important parameters in the photocatalytic application of SnS2 nanoparticles. Our results show that the presence of citric acid (used as a capping agent) restricts the formation of hexagonal nanoparticles. We also demonstrated that using thioacetamide as a sulfur source results in smaller nanoparticles than thiourea, 24.0 nm and 616 nm respectively. Moreover, small hexagonal nanoparticles play a key role in the photocatalytic activity of SnS2 nanoparticles. Compared with TiO2 performance, SnS2 nanoparticles exhibited faster kinetics for methyl orange (MO) degradation, Kapp = 0.0102 min−1, and 0.029 min−1, respectively. We proved that SnS2 is capable of breaking the azo bond of methyl orange by direct reduction. Furthermore, our analyses indicate that SnS2 nanoparticles do not degrade atrazine and imazapic, but the photocatalytic route of metribuzin competed with photolysis, resulting in a particular transformation product that was not obtained with light irradiation only. We demonstrated that SnS2 nanoparticles have high bond selectivity for azo breaking. Furthermore, they represent an advance for the development of designed materials (such as heterostructures), where the properties of SnS2 can be tuned.

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The data sets used and analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgments

We are thankful to Lic. Alvaro Olivera from Laboratorio de Alta Resolución, Departamento de Desarrollo Tecnológico, CURE, Rocha, Udelar, for the TEM images, and Dr. Alejandro Amaya from Cátedra de Fisicoquímica y Laboratorio de Fisicoquímica de Superficies, DETEMA, Facultad de Química, Montevideo, Udelar, for the nitrogen adsorption isotherm measurements. We are also thankful to Msc. Isabel Galain, Área de Radioquímica Facultad de Química, Udelar, and Dr. Mauricio Rodríguez from PDU Ciencias Físicas y sus aplicaciones, CURE, Udelar, for guidance in FTIR interpretation.

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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Daniela Oreggioni, Andrés Pérez Parada, Ivana Aguiar, Marcos Collazo, Lucía Pareja, María Andrea De León, Heinkel Bentos Pereira, and María Eugenia Pérez Barthaburu. The first draft of the manuscript was written by María Eugenia Pérez Barthaburu and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to María Eugenia Pérez Barthaburu.

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Oreggioni, D., Pérez Parada, A., Aguiar, I. et al. Sulfur precursor and citric acid effect on SnS2 nanoparticles and their influence on the photodegradation activity of selected organic compounds. Environ Sci Pollut Res 28, 18234–18245 (2021). https://doi.org/10.1007/s11356-020-11809-6

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  • DOI: https://doi.org/10.1007/s11356-020-11809-6

Keywords

  • Tin sulfide
  • SnS2
  • Photocatalysis
  • Methyl orange
  • Herbicides
  • Atrazine
  • Metribuzin
  • Imazapic