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Enhanced Stability of Abundant Amorphous Iron (III) oxide Grafted AlSBA‐15 as Highly Efficient Heterogeneous Fenton Catalyst for the Destruction of Phenol
Author(s) -
Thirumoorthy Kulandaivel,
Satishkumar Govindaswamy
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201901510
Subject(s) - catalysis , mesoporous material , x ray photoelectron spectroscopy , iron oxide , phenol , chemistry , leaching (pedology) , amorphous solid , nuclear chemistry , oxide , inorganic chemistry , mcm 41 , materials science , chemical engineering , organic chemistry , environmental science , soil science , engineering , soil water
24 wt% of iron has been successfully grafted as amorphous iron oxide over mesoporous channels of SBA‐15 and 10 wt% alumina coated SBA‐15 (AlSBA‐15) using selective extraction deposition (SED) technique. The synthesized materials have been characterized using XRD, N 2 adsorption studies, SEM‐EDS, 27 Al MAS NMR, XPS, H 2 ‐TPR, and HR‐TEM techniques. 27 Al MAS NMR and XPS characterization results revealed that iron has been preferentially grafted over alumina. The increased binding energy of the Fe2p electron (XPS) in the 24wt %Fe/AlSBA‐15 confirms the existence of strong donor‐acceptor interaction between grafted iron oxide and an alumina support. In TPR studies, unlike silica support, AlSBA‐15 tuned the reduction property of various grafted oxidic iron species, which is evidenced by shifting of iron reduction peak to a high temperature of 436 °C. In the destruction of 200 ppm of phenol 24wt %Fe/AlSBA‐15 catalyst demonstrated 100% phenol conversion and 86% TOC removal with 0.4 ppm (0.1%) iron leaching within 30 minutes of reaction. 24wt %Fe/SBA‐15 catalyst also exhibited similar performance however, leaching of iron was found to be up to 20 ppm (8%). The 24wt %Fe/AlSBA‐15 catalyst was recycled successfully five times without loss in the catalytic activity and stability.