Enhanced UV-assisted Fenton performance of nanostructured biomimetic α-Fe2O3 on degradation of tetracycline

Autor: Qing-rui Zeng, Hadiza Abdullahi Ari, Wei Feng, Olushola Adewole Alani, Nnanake-Abasi O. Offiong, Yunusa Adamu Ugya
Rok vydání: 2021
Předmět:
Zdroj: Journal of Nanostructure in Chemistry. 12:45-58
ISSN: 2193-8865
2008-9244
DOI: 10.1007/s40097-021-00400-1
Popis: Nanostructured α-Fe2O3 (hematite) were successfully synthesized via a simple plant extract-assisted method using the leaf extract of Azadirachta indica (neem) as the reducing and stabilizing agent and ferric chloride as the precursor. In the absence of additional toxic reducing and stabilizing agents, the plant phytoconstituents also assist in the final shape of the nanocatalyst giving it more reactive sites. The as-synthesized nanostructured hematite was well characterized. FT-IR analysis verified 523 and 458 cm−1 as absorption edge of the α-Fe2O3 NPs. XRD patterns revealed the sample to be of rhombohedral (hexagonal) structure with crystallite sizes of 18.9 nm. SEM and TEM images showed the α-Fe2O3-AI with bio-C doping to be of perfect crystallinity compared to the normal chemically synthesized α-Fe2O3, which shows some aggregation. Spectrum from the XPS confirmed the α-Fe2O3-AI with bio-C doping to be mainly composed of Fe, O, and C. The nanostructured α-Fe2O3-AI with small bio-C doping possess large surface area and exhibited high performance as a heterogeneous catalyst for the degradation of tetracycline (TC, 50 mg/L) by the synergistic effect of the UV-Fenton (UV/α-Fe2O3/H2O2) compared to the Fenton-like oxidation (α-Fe2O3/H2O2) and photocatalysis (UV/α-Fe2O3). Furthermore, the catalyst demonstrated a broad scope pH for efficient UV-Fenton degradation for TC and can be reuse up to five consecutive cycles without significant loss in activity.
Databáze: OpenAIRE
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