Sulfur precursor and citric acid effect on SnS2 nanoparticles and their influence on the photodegradation activity of selected organic compounds
2021
Oreggioni, Daniela | Pérez Parada, Andrés | Aguiar, Ivana | Colazzo, Marcos | Pareja, Lucía | De León, María Andrea | Pereira, Heinkel Bentos | Pérez Barthaburu, María Eugenia
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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