1. Hematite (Fe2O3)-modified biopolymer for Rhodamine B degradation under visible light.
- Author
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Beyaz, K., Abdi, Y., Bagtache, R., Trari, M., and Benaboura, A.
- Abstract
This study deals with the preparation of a novel biomaterial by incorporating the hematite α-Fe2O3 onto crushed leaves of the Washingtonia filifera palm tree in their raw state and in extracted cellulose from the same plant. The incorporation of α-Fe2O3 was accomplished by hydrothermal route at 200 °C. The palm leaves, extracted cellulose, and synthesized products were characterized by thermal analysis (TG) and FT-IR spectroscopy. The latter revealed peaks at 524 and 449 cm−1 for the synthesized material, attributed to vibrational deformation of the inorganic Fe-O bond. In contrast to the TG profile of raw palm leaves, the thermogram of the composite degrades in a single step at 343 °C. This one-step decomposition clearly indicates the chemical modification of our cellulose matrix and confirms the successful incorporation of the hematite α-Fe2O3 into the lignocellulose. The second part is devoted to α-Fe2O3 working as sensitizer in photocatalysis, it was characterized optically (Eg= 1.94 eV) and electrochemically with a flat band potential of −0.53 VSCE. The conduction band (−0.73 VSCE) is more cathodic than the potential of the O2/O2•− couple (−0.52 VSCE) and should reduce dissolved oxygen into reactive O2•− radical. The as-prepared materials were successfully tested in the photocatalytic degradation of Rh B (10 ppm) and the result gave an abatement of 60% on α-Fe2O3/lignocellulose under visible light irradiation (LED lamp) with a flux of 23 mW cm−2. The kinetic obeys a first-order model with a half photocatalytic-life of ∼ 7 h. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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