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Facile fabrication of hybrid titanium(IV) isopropoxide/pozzolan nanosheets (TnS-Pz) of high photocatalytic activity: characterization and application for Cr(VI) reduction in an aqueous solution

  • Advanced Oxidation/Reduction Technologies: An Perspective from Iberoamerican Countries
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Abstract

This paper presents the synthesis of a hybrid material through the use of natural pozzolan and titanium(IV) isopropoxide using the sol-gel method and its application in the photocatalytic hexavalent chromium reduction. The characterization data indicated a mesoporous material possessing a surface area of 271.7 m2 g−1. The morphology studies (SEM and TEM) showed nanosheet hybrid structures. The analysis of DRUV, FTIR, XRD, and Mössbauer spectroscopy provides a different electronic structure of the synthetized material when compared with the originals, proving the hybridization process between pozzolan and titanium(IV) isopropoxide. The photocatalytic reduction of Cr(VI) to Cr(III) using the hybrid material showed a better performance than conventional photocatalysts (precursor and TiO2-P25). Operational conditions such as chromium initial concentration (0.02–0.20 mM), solution pH (3–6), and type of scavenger (citric or tartaric acid) were evaluated in order to determine the best experimental conditions for the Cr(VI) photoreduction. At their optimum (catalyst load of 15 mg L−1, tartaric acid as scavenger, [scavenger]0/[Cr(VI)]0 M ratio = 3:1, pH 3, and 25 °C), the total photoreduction of 0.20 mM Cr(VI) was achieved in 180 min. The novel hybrid materials synthesized from pozzolan and titanium(IV) isopropoxide showed to be a potential catalyst for the Cr(VI) reduction in aqueous solution.

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Acknowledgments

The authors would like to acknowledge LABMASSA – Mass Transfer Laboratory of the Federal University of Santa Catarina (UFSC), the supplier of all laboratory infrastructure used in this research project. Aline M. Novack acknowledges her scholarship supported by CAPES. Dr. Glaydson Simoes dos Reis is grateful to the Council for the Development of Higher Education at the Graduate Level, Brazil (CAPES) for his postdoctoral scholarship granted through National Postdoctoral Program (PNPD). Maja Đolić acknowledges the grant from the Ministry of Education and Science of the Republic of Serbia (III 43009). Vítor J.P. Vilar acknowledges the 2017 FCT Individual Call to Scientific Employment Stimulus (CEECIND/01317/2017).

Funding

This work was financially supported by CAPES-PRINT, project number 88887.310560/2018-00, and Associate Laboratory LSRE-LCM - UIDB/50020/2020—funded by national funds through FCT/MCTES (PIDDAC).

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  1. Aline M. Novack and Glaydson S. dos Reis contributed equally to this work.

Authors and Affiliations

  1. Laboratory of Mass Transfer, Federal University of Santa Catarina (UFSC), PO Box 476, Florianópolis, SC, 88040-900, Brazil

    Aline M. Novack, Fabíola V. Hackbarth, Belisa A. Marinho, José A. B. Valle, Antônio Augusto Ulson de Souza & Selene M. A. Guelli Ulson de Souza

  2. Graduate Program in Mine, Metallurgical, and Materials Engineering (PPGE3M), School of Engineering, Federal University of Rio Grande do Sul (UFRGS), Av. Bento Gonçalves 9500, Porto Alegre, RS, Brazil

    Glaydson S. dos Reis

  3. Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, Belgrade, 11000, Serbia

    Maja B. Ðolić

  4. Departament d’Enginyeria Minera, Industrial i TIC, Prof. Serra Húnter, Universitat Politècnica de Catalunya Barcelona Tech, Manresa, Barcelona, Spain

    Carlos H. Sampaio

  5. Institute of Chemistry, Federal University of Rio Grande do Sul (UFRGS), Av. Bento Gonçalves 9500, Postal Box 15003, Porto Alegre, RS, 91501-970, Brazil

    Eder C. Lima

  6. Environmental Processes Laboratory (LAPAM), Chemical Engineering Department, Federal University of Santa Maria (UFSM), Av. Roraima 1000, Santa Maria, RS, 97105-900, Brazil

    Guillherme L. Dotto

  7. Laboratory of Separation and Reaction Engineering - Laboratory of Catalysis and Materials (LSRE-LCM), Department of Chemical Engineering, Faculty of Engineering, University of Porto, Rua do Dr. Roberto Frias, 4200-465, Porto, Portugal

    Vítor J. P. Vilar

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  1. Aline M. Novack
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Correspondence to Belisa A. Marinho or Vítor J. P. Vilar.

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Highlights

• Facile fabrication of hybrid titanium(IV) isopropoxide/pozzolan nanosheets

• Ti–O–Si and Ti–O–Al bonds between the titanium(IV) isopropoxide and pozzolan

• Innovative hybrid pozzolan-based material for Cr(VI) photocatalytic reduction

• A novel photocatalyst with a short bandgap and high SBET

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Novack, A.M., dos Reis, G.S., Hackbarth, F.V. et al. Facile fabrication of hybrid titanium(IV) isopropoxide/pozzolan nanosheets (TnS-Pz) of high photocatalytic activity: characterization and application for Cr(VI) reduction in an aqueous solution. Environ Sci Pollut Res 28, 23568–23581 (2021). https://doi.org/10.1007/s11356-020-09178-1

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