Health & Environmental Research Online (HERO)


Print Feedback Export to File
5075430 
Journal Article 
Photo-catalytic selective organic transformations by Fe-doped octahedral molecular sieves (manganese oxide) nano-structure 
Said, S; El Maghrabi, HH; Riad, M; Mikhail, S 
2018 
6 
2 
169-181 
WOS:000436843800008 
The future development of chemistry entails environment-friendly and energy-sustainable alternatives for organic transformations. Visible light photo-catalysis can address these challenges. Octahedral molecular sieve manganese oxide (cryptomelane, OMS-2) and Fe-doped OMS-2 nano-structures were prepared to be used as affective visible light photo-catalysts for the oxidation of cyclohexane. The photo-catalysts were prepared by reflux method (at 100 degrees C, for 24 h) under atmospheric pressure by using different molar ratios of Fe/Mn (0, 0.03, 0.08 and 0.10). Several techniques such as X-ray diffraction, transmission electron microscopy, Fourier-transform infrared spectra, nitrogen adsorption/desorption isotherms and thermal analysis were performed for characterizing the structure and the morphology of the prepared samples. The results revealed that the Fe-OMS-2 samples have a well-crystalline cryptomelane framework. In addition, no peaks related to the Fe dopant were detected, indicating the incorporation of Fe species into the framework of cryptomelane. The main product of photocatalytic oxidation reaction of cyclohexane is cyclohexanone with a selectivity of 100% after 3 h for highest conversion on using 0.08Fe-OMS-2 sample. 
Cryptomelane; Fe doping; preparation; characterization; photocatalytic oxidation; reaction mechanism