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Heteroacoagulation of lignocellulose fibers-based biotemplates and functionalized TiO2 nanoparticles to tailor film microstructures

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Abstract

The heterocoagulation of lignocellulose nanofibers (LCNFs) with functionalized TiO2 nanoparticles (NPs) is presented as an innovative revalorization strategy for the exploitation of lignocellulose wastes. Their use as bio-templates could be considered a promising alternative in a current biorefinery scheme, since the massive production of porous materials in numerous nanotechnological applications, could offer new alternatives of exploitation. The surface modification of TiO2 NPs by adsorption of polyetilenimine (PEI) favors its anchorage with LCNFs through a peptide bond during heterocoagulation in aqueous suspension. The functionalization of LCNFs with TiO2 NPs results in organic–inorganic core–shell nanostructures, used to shape coatings by dipping, and sinter them at low temperature (450 °C). In this process, the LCNFs were used as endo-templates for shaping stable porous coatings, when they burn during the consolidation of the inorganic structure. In this work, the successful inclusion and homogeneous distribution of biomaterials (LCNF templates) in the semiconductor inorganic microstructure is discussed in terms of dye loading (by UV–Visible Spectroscopy), photovoltaic efficiency and charge transfer (by Electrochemical Impedance Spectroscopy, EIS) in a Dye Sensitized Solar Cell (DSSC). Results confirm that the TiO2/template network yielded better photoefficiency and electron transport properties than mesoporous films assembled only from TiO2 NPs. The preparation of TiO2-based photoanodes with enhanced performance (with an efficiency value around 6%, for a thickness of 8.7 µm) allows validating the successful colloidal procedure herein employed.

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Acknowledgments

The authors thank the support to the projects S2018/NMT-4411 (Comunidad de Madrid) and MAT2015-70780-C4-1 (MINECO/FEDER). Z. Gonzalez acknowledges to the European Ceramic Society for the funds of the “Frontiers of Research” program and also to the Spanish Ministry of Economy and Competitiveness for the Postdoctoral Fellowship: IJCI-2016-28538.

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Zoilo Gonzalez: Funding acquisition, Investigation, Formal analysis, Conceptualization, Writing-original draft; Joaquin Yus: Investigation, Formal analysis; Yessica Bravo: Investigation, Formal analysis; Antonio Javier Sanchez-Herencia: Conceptualization, Formal analysis, Funding acquisition; Alejandro Rodríguez: Conceptualization, Investigation; Jennifer Dewalque: Investigation, Formal analysis; Laura Manceriu: Formal analysis, Writing—review and editing; Catherine Henrist: Conceptualization, Supervision, Funding acquisition; Begoña Ferrari: Conceptualization, Supervision, Funding acquisition, Writing—original draft.

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Correspondence to Z. Gonzalez.

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Gonzalez, Z., Yus, J., Bravo, Y. et al. Heteroacoagulation of lignocellulose fibers-based biotemplates and functionalized TiO2 nanoparticles to tailor film microstructures. Cellulose 27, 7543–7559 (2020). https://doi.org/10.1007/s10570-020-03297-1

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  • DOI: https://doi.org/10.1007/s10570-020-03297-1

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