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ZnS-doped TiO2 photocatalysts for 4-chlorophenol photodegradation in water

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Abstract

The TiO2-X% ZnS photocatalysts, where X represents the molar percentage of ZnS (3%, 5%, 10%, and 15%), were synthesized using the one-step sol–gel method. In a Batch-type reactor, under the irradiation of a mercury lamp (λ = 254 nm, Pen-Ray), degradations of 55 ppm 4-chlorophenol were obtained at 400 min with the synthesized photocatalysts: 90% (TiO2), 60% (3% ZnS), 66% (5% ZnS), 74% (10% ZnS), and 58% (15% ZnS). ZnS addition in the photocatalysts inhibits a good performance, being the support, TiO2, the most photoactive material when irradiating in the ultraviolet region. TiO2 showed suppression of hole electron pair recombination and high electron storage, outstanding separation, and transfer.

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The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Acknowledgments

M. E. Velásquez-Torres thanks CONACYT for the scholarship grant (CVU: 740103). The authors are grateful for the following funding projects: SECTEI/288/2019 8994c19, CONACyT A1-S-41124, SIP-IPN 20221110, SIP-IPN 20220568, UAM 12413443, CONACyT 316022, and A1-S-41124 (-f-3499).

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Authors and Affiliations

  1. Departamento de Ingeniería de Procesos e Hidráulica, Posgrado en Energía y Medio Ambiente, Universidad Autónoma Metropolitana – Iztapalapa, Av. San Rafael Atlixco No. 189, 09340, Ciudad de Mexico, Mexico

    M. E. Velásquez-Torres

  2. Departamento de Química, Área de Catálisis, Universidad Autónoma Metropolitana – Iztapalapa, Av. San Rafael Atlixco No. 189, 09340, Ciudad de Mexico, Mexico

    F. Tzompantzi, J. C. Castillo-Rodríguez & H. Sierra-Uribe

  3. Departamento de Biociencias e Ingeniería, Centro Interdisciplinario de Investigaciones y Estudios sobre Medio Ambiente y Desarrollo (CIIEMAD), Instituto Politécnico Nacional, 07340, Ciudad de Mexico, Mexico

    C. E. Santolalla-Vargas

  4. Departamento de Física, Área de Polímeros, Universidad Autónoma Metropolitana – Iztapalapa, Av. San Rafael Atlixco No. 189, 09340, Ciudad de Mexico, Mexico

    J. Cardoso-Martínez

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  1. M. E. Velásquez-Torres
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Correspondence to M. E. Velásquez-Torres.

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Velásquez-Torres, M.E., Tzompantzi, F., Castillo-Rodríguez, J.C. et al. ZnS-doped TiO2 photocatalysts for 4-chlorophenol photodegradation in water. MRS Advances 7, 1189–1192 (2022). https://doi.org/10.1557/s43580-022-00439-4

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