Publication Type Journal Article
Title Ultrasound and photo-assisted oxidation of toluene and benzyl alcohol with oxidovanadium(V) complexes
Authors Manas Sutradhar Marta G. Martins David H. B. G. O. R. Simoes Rita M. N. Serodio Hugo M. Lapa Elisabete C.B.A. Alegria M. Fátima C. Guedes da Silva Armando J.L. Pombeiro
Groups CCC
Year 2022
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Volume 638
Abstract The aroylhydrazone Schiff bases 2-hydroxy-N -(1-(pyrazin-2-yl)ethylidene)benzohydrazide and N,N -bis(2-hydroxybenzylidene)oxalohydrazide, have been used to synthesize the dinuclear complexes [VO(HL1)(mu-O)](2) (1) and [\VO(OEt)(EtOH)\(2)(L-2)] (2)center dot 2 H2O. Complex 1 is newly synthesized and 2 was reported earlier. Structural characterization of 1 was accomplished by single crystal X-ray diffraction, elemental analysis, and IR spectroscopy. The catalytic performance of both vanadium complexes was investigated for the peroxidative oxidation of toluene and benzyl alcohol through advanced oxidation processes (AOPs). Besides the conventional heating (CONV), other energy inputs, i.e., ultrasound-assisted (US\_PROBE and US\_BATH) and photo-assisted (PHOTO) methods were explored. The effects of a series of parameters were studied to improve the catalytic reaction. For the peroxidative oxidation (H2O2, 30\% aq.) of toluene for 1 h at room temperature, the oxygenated product yields followed the trend: US\_PROBE (8.1\%) > US\_BATH (5.4\%) > PHOTO (3.9\%) > CONV (no oxygenated products). The effect of other energy inputs (besides conventional heating) in the formation of oxygenated products is even more pronounced in the peroxidative oxidation of benzyl alcohol carried out for 1 h at room temperature, with the following trend: US\_PROBE (59.5\%) > PHOTO (30.9\%) US\_BATH (21.5\% of oxygenated products) > CONV (no oxygenated products detected). Complexes 1 and 2 are promising catalysts for the conversion of toluene and benzyl alcohol under very light reaction conditions when assisted by ultrasound irradiation, and this sonochemical approach is disclosed as a promising advanced oxidation process (AOP).
Book Title
ISSN 0926-860X
EISSN 1873-3875
Conference Name
Bibtex ID WOS:000795542400007
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