Green oxidation reactions by graphene oxide-based catalyst with aqueous hydrogen peroxide
Publish place: Asian Journal of Green Chmistry، Vol: 3، Issue: 3
Publish Year: 1398
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_AJGC-3-3_007
تاریخ نمایه سازی: 17 آذر 1398
Abstract:
This study reports the synthesis, characterization and catalytic properties of a novel supported catalyst on the basis of nickel acetate hydrate (NiOAC) immobilized on graphene oxide (GO) modified polyethylene glycol (PEG). The catalyst was characterized by scanning electron microscopy (FESEM), X-ray diffraction spectroscopy (XRD), furrier transforms infrared spectroscopy (FT-IR) and diffuse reluctance spectroscopy (DRS). It showed a high activity in the green oxidation of thioanisole as a model substrate to sulfoxide product at ambient temperature and presurre. To establish the general applicability of the process, various sulfides were subjected to the oxidation system using the synthesized catalyst. The reactivities of the sulfur compounds were influenced by two main factors, i.e., the electron density on the S atom and the steric hindrance of the sulfur compound. In addition, ethanol was selected as a green solvent for this procedure. The effects of the main process variables including H2O2 amount (mmol), reaction time (min) and catalyst amount (mg) were analyzed by response surface methodology (RSM) based on the central composite design (CCD). The optimal condition for conversion of thioanisole was found to be O/S ratio 3.4, reaction time 31 min for 21 mg of catalyst amount.
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Authors
Mehrnaz Alem
Chemistry Department, Payame Noor University, ۱۹۳۹۵-۳۶۹۷, Tehran, Iran
Shahnaz Kazemi
Department of Chemistry, Faculty of Science, University of Birjand, P. O. Box ۹۷۱۷۵-۶۱۵, Birjand, Iran
Abbas Teimouri
Chemistry Department, Payame Noor University, ۱۹۳۹۵-۳۶۹۷, Tehran, Iran
Hossein Salavati
Chemistry Department, Payame Noor University, ۱۹۳۹۵-۳۶۹۷, Tehran, Iran
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