Adsorption and heterogeneous Fenton degradation of 17α-methyltestosterone on nano Fe3O4/MWCNTs in aqueous solution

• Published in: Applied catalysis. B, Environmental Vol. 107; no. 3-4; pp. 274 - 283
• Main Authors: Hu, Xiaobin, Liu, Benzhi, Deng, Yuehua, Chen, Hongzhe, Luo, Si, Sun, Cheng, Yang, Po, Yang, Shaogui
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 21.09.2011; Elsevier
• Subjects: 17α-Methyltestosterone; Adsorption; Catalysis; Chemistry; Colloidal state and disperse state; Exact sciences and technology; General and physical chemistry; Heterogeneous Fenton reaction; Magnetite decorated multiwalled carbon nanotube; Physical and chemical studies. Granulometry. Electrokinetic phenomena; Surface physical chemistry; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; 17α-Methyltestosterone; Magnetite decorated multiwalled carbon nanotube; Adsorption; Heterogeneous Fenton reaction; Binary compound; Iron oxide; Hydrogen peroxide; Growth; Nanoparticle; In situ; Nanotube; Carbon nanotubes; X ray; Degradation; Magnetite; Magnetite decorated multiwalled carbon; Fenton reaction; Photoelectron spectrometry; Inverse; Oxidation; Transition element compounds; Crystals; Carbon; X ray diffraction; Trace; Heterogeneous catalysis; Transmission electron microscopy; Multiwalled nanotube; Spinel; Spinels; Aqueous solution; Catalyst; Environmental protection; Heterogeneous reaction
• ISSN: 0926-3373; 1873-3883
• DOI: 10.1016/j.apcatb.2011.07.025

[Display omitted] ► A novel inverse-spinel Fe3O4/MWCNTs catalyst was prepared by in situ growth. ► The catalyst has been used to adsorb and degrade trace 17α-methyltestosterone. ► The catalyst showed higher adsorption and catalytic ability than nano Fe3O4. ► The enhanced ability related to the enrichment of target molecules on MWCNTs. A novel catalyst, inverse-spinel ferroferric oxide nanoparticles decorated multiwalled carbon nanotubes (Fe3O4/MWCNTs) was successfully prepared, and applied for the adsorption and degradation of trace artificial androgen 17α-methyltestosterone (MT) in the presence of H2O2. The regular growth of ferroferric oxide crystal on multiwalled carbon nanotubes was achieved by in situ oxidation of Fe2+ in hot alkaline solution. The catalyst was characterized by BET, XRD, TEM, XPS and Raman spectroscopy. The effects of initial pH, catalyst loading, oxidant concentration and iron leaching on the degradation of MT were investigated. The Fe3O4/MWCNTs showed higher ability of adsorption and degradation efficiency of MT than bare Fe3O4 in the batch degradation experiment. The degradation efficiencies increased with the initial pH decreasing in the wide pH range of 8.0–3.5. Further, the catalyst showed stable catalytic activity, fairly good mechanic stability and convenient recycling. Negligible iron leaching showed the reused Fe3O4/MWCNTs withstood the oxidation. The enhanced degradation efficiency of Fe3O4/MWCNTs may relate to the enrichment of trace MT molecules by MWCNTs in the vicinities of active sites.