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Features of lignosulfonate depolymerization and photocatalytic transformation to low-molecular-weight compounds over nano-sized semiconductive films

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Abstract

Utilization of the second-most abundant biopolymer, lignin, in production of fine chemicals is considered as a strategy for environmental conservation and economic feasibility of technologies. Photocatalytic conversion of sodium lignosulfonate to low molecular weight compounds over eco-friendly semiconducting materials under simulated solar light is a perspective eco-innovative approach for “green technology” development. The more efficient depolymerization of lignosulfonate during photolytic reaction occurs at pH 2 as a result of sulfonic groups’ protonation, whereas the re-polymerization of hydrolyzed fragments to more complex structure in solutions at pH 5 and pH 9 is reported. Photo-sensibilization pathway toward polymer fragmentation is low effective process. It is shown that photocatalytic process is also more effective at pH 2 due to an electrostatic interaction of positively charge surface of metal oxides’ films and negatively charged NaLSA molecules. As shown by LDI MS investigation, the destruction of aromatic component of NaLSA molecule can be achieved in the presence of TiO2 film under simulated solar light due to the strong reductive power of superoxide radicals resulting in the benzoic ring-opening route. The mechanism of photocatalytic reaction over iron titanate films is governed by the presence of two semi-conductive crystalline phases, pseudobrookite and landauite, that are characterized by the anodically shifted energy positions of the conduction and valence bands compared to TiO2 providing an effective oxidation by HO radicals. Nitrogen-doped iron titanate films are considered as a photocatalyst for the processes of low molecular weight aromatic compounds’ synthesis exhibiting activity under both simulated solar and visible light with the phenol yields of 0.96 μg mL−1 and 1.2 μg mL−1, respectively.

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Acknowledgements

This research was funded by National Research Foundation of Ukraine (Project No 2020.01/0136 “Efficient use of renewable plant resources and photocatalytic conversion of biomass as eco-innovative approaches for environmental protection and human biosafety”). The authors are thankful the brave defenders of Ukraine who provided the possibility to finalize this publication.

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Correspondence to O. Linnik.

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Kramar, A., Anishchenko, V., Kuzema, P. et al. Features of lignosulfonate depolymerization and photocatalytic transformation to low-molecular-weight compounds over nano-sized semiconductive films. Appl Nanosci 12, 2345–2355 (2022). https://doi.org/10.1007/s13204-022-02492-9

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  • DOI: https://doi.org/10.1007/s13204-022-02492-9

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