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i-Propylammonium lead chloride based perovskite photocatalysts for depolymerization of lignin under UV light


Kausar, Samia and Altaf, Ataf Ali and Hamayun, Muhammad and Rasool, Nasir and Hadait, Mahwish and Akhtar, Arusa and Shabbir, Muhammad and Badshah, Amin and Ali Shah, Syed Adnan and Zakaria, Zainul Amiruddin (2020) i-Propylammonium lead chloride based perovskite photocatalysts for depolymerization of lignin under UV light. Molecules, 25 (15). art. no. 3520. pp. 1-24. ISSN 1420-3049


Lignin depolymerization for the purpose of synthesizing aromatic molecules is a growing focus of research to find alternative energy sources. In current studies, the photocatalytic depolymerization of lignin has been investigated by two new iso-propylamine-based lead chloride perovskite nanomaterials (SK9 and SK10), synthesized by the facile hydrothermal method. Characterization was done by Powder X-Ray Diffraction (PXRD), Scanning Electron Microscopy (SEM), UV-Visible (UV-Vis), Photoluminescence (PL), and Fourier-Transform Infrared (FTIR) Spectroscopy and was used for the photocatalytic depolymerization of lignin under UV light. Lignin depolymerization was monitored by taking absorption spectra and catalytic paths studied by applying kinetic models. The %depolymerization was calculated for factors such as catalyst dose variation, initial concentration of lignin, and varying temperatures. Pseudo-second order was the best suited kinetic model, exhibiting a mechanism for lignin depolymerization that was chemically rate controlled. The activation energy (Ea) for the depolymerization reaction was found to be 15 kJ/mol, which is remarkably less than conventional depolymerization of the lignin, i.e., 59.75 kJ/mol, exhibiting significant catalytic efficiencies of synthesized perovskites. Products of lignin depolymerization obtained after photocatalytic activity at room temperature (20 °C) and at 90 °C were characterized by GC-MS analysis, indicating an increase in catalytic lignin depolymerization structural subunits into small monomeric functionalities at higher temperatures. Specifically, 2-methoxy-4-methylphenol (39%), benzene (17%), phenol (10%) and catechol (7%) were detected by GC-MS analysis of lignin depolymerization products.

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Official URL or Download Paper: https://www.mdpi.com/1420-3049/25/15/3520

Additional Metadata

Item Type: Article
Divisions: Faculty of Medicine and Health Science
Halal Products Research Institute
DOI Number: https://doi.org/10.3390/molecules25153520
Publisher: Multidisciplinary Digital Publishing Institute
Keywords: Photocatalysis; Lignin depolymerization; Perovskites; Kinetics; Activation energy
Depositing User: Ms. Nuraida Ibrahim
Date Deposited: 18 Aug 2021 09:11
Last Modified: 18 Aug 2021 09:11
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.3390/molecules25153520
URI: http://psasir.upm.edu.my/id/eprint/89465
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