Natural a-Fe^sub 2^O^sub 3^ as an efficient catalyst for the p-nitrophenol reduction

4 nitrophenol (4-NP) is a recalcitrant water pollutant. It reduces to 4 aminophenol (4-AP), which is a less harmful compound. Typically, a noble metal catalyzes this reaction. However, its preparation is complex and expensive. Here, for the first time, we test hematite either from natural goethite c...

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Published in:Materials science & engineering. B, Solid-state materials for advanced technology Solid-state materials for advanced technology, 2018-03, Vol.229, p.126
Main Authors: Elfiad, Amal, Galli, Federico, Djadoun, Amar, Sennour, Mohamed, Chegrouche, Saleh, Meddour-Boukhobza, Laaldja, Boffito, Daria Camilla
Format: Article
Language:English
Subjects:
Adsorption
Aminophenol
Catalysis
Catalysts
Catalytic activity
Desorption
Energy transmission
Gravimetric analysis
Hematite
Iron oxides
Nitrophenol
Noble metals
Particle size distribution
Reducing agents
Transmission electron microscopy
Watershed management
X ray fluorescence analysis
X-ray diffraction
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Summary:4 nitrophenol (4-NP) is a recalcitrant water pollutant. It reduces to 4 aminophenol (4-AP), which is a less harmful compound. Typically, a noble metal catalyzes this reaction. However, its preparation is complex and expensive. Here, for the first time, we test hematite either from natural goethite calcination and compared with a synthetic hematite prepared by citrate or traditional precipitation method. We characterize the catalysts by thermo gravimetric analysis (TGA), X-ray fluorescence (XRF), X-ray diffraction (XRD) transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX), particle size distribution (PSD), and nitrogen adsorption desorption at 77 K. 4-NP reacted in presence of NaBH4 as the reducing agent to 4-AP. Kinetic study and catalyst stability were performed. Particle morphology played an important role in the reaction. All samples exhibited high catalytic activity with first order kinetic constants of 0.024, 0.027, 0.037 s-1 for natural α-Fe2O3, hematite prepared by precipitation, and citrate method, respectively.
ISSN:0921-5107
1873-4944