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S-incorporated TiO2 coatings grown by plasma electrolytic oxidation for reduction of Cr(VI)-EDTA with sunlight

  • Advanced Oxidation Technologies: State-of-the-Art in Ibero-American Countries
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Abstract

The plasma electrolytic oxidation (PEO) technique was used to prepare photocatalytic S-TiO2 coatings on Ti sheets; the incorporation of the S ions was possible from the electrolyte for modifying the structural and optics characteristics of the material. In this work, substrates of Ti (ASME SB-265 of 20 × 20 × 1 mm) were used in a PEO process in 10 min, using constant voltage pulses of 340 V with frequency of 1 kHz and duty cycles of 10% and of 30%. Solutions with H2SO4 (0.1 M) and CH4N2S (52 and 79 mM) were used as electrolytes. X-ray diffraction, scanning electron microscopy, and energy dispersive spectroscopy (EDS) were utilized to analyze the surface morphology, crystalline phase, and chemical composition of the samples. According to the results, the catalyst coatings had microporous structure and contained anatase-rutile TiO2 nanocrystalline mixture, until 73.2% rutile and 26.8% anatase in the samples grown with 30% duty cycle and the lowest concentration of CH4N2S. From the EDS measurements, the incorporation of sulfur ions to the coatings was 0.08 wt%. 99.5% reduction efficiency of Cr(VI)-EDTA with sunlight was observed after 2 h; it was determined by diphenyl carbazide spectrophotometric method. These coatings have potential for effective sunlight heterogeneous photoreduction of this toxic, cumulative, and non-biodegradable heavy metal that contaminates the soil and water and is a serious risk to sustainability, ecosystems, and human health.

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Acknowledgements

The authors acknowledge the Interdisciplinary Institute of Sciences of Quindío University for the XRD measurements.

Funding

This study received financial support from the University of Quindío through the 869 project.

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Authors and Affiliations

  1. Research Group in Applied Science for Ecological Region Development- GICADE of Interdisciplinary Institute of Sciences, University of Quindío, Armenia, Colombia

    Fernando Gordillo-Delgado, Sara Moya-Betancourt, Anyi Parra-López & John A. Garcia-Giraldo

  2. Plasma Physics Laboratory, National University of Colombia, Manizales, Colombia

    Darwin Torres-Cerón

Authors
  1. Fernando Gordillo-Delgado
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  2. Sara Moya-Betancourt
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  3. Anyi Parra-López
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  4. John A. Garcia-Giraldo
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  5. Darwin Torres-Cerón
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Corresponding author

Correspondence to Fernando Gordillo-Delgado.

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Responsible editor: Suresh Pillai

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Gordillo-Delgado, F., Moya-Betancourt, S., Parra-López, A. et al. S-incorporated TiO2 coatings grown by plasma electrolytic oxidation for reduction of Cr(VI)-EDTA with sunlight. Environ Sci Pollut Res 26, 4253–4259 (2019). https://doi.org/10.1007/s11356-018-2695-6

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  • DOI: https://doi.org/10.1007/s11356-018-2695-6

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