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M ulti‐walled carbon nanotubes supported amorphous Fe 2 O 3 and Ag 2 O–Fe 2 O 3 as F enton catalysts for degradation of m axilon red dye
Author(s) -
ElKhouly Sahar M.,
Fathy Nady A.
Publication year - 2018
Publication title -
asia‐pacific journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.348
H-Index - 35
eISSN - 1932-2143
pISSN - 1932-2135
DOI - 10.1002/apj.2184
Subject(s) - catalysis , nanocomposite , adsorption , carbon nanotube , degradation (telecommunications) , calcination , nuclear chemistry , fourier transform infrared spectroscopy , amorphous solid , materials science , oxide , chemical engineering , amorphous carbon , nanoparticle , chemistry , nanotechnology , organic chemistry , metallurgy , telecommunications , computer science , engineering
Two Fenton‐like catalysts of iron oxide (Fe 2 O 3 ) or Fe 2 O 3 doped with silver oxide (Ag 2 O) and supported on acidified multi‐walled carbon nanotubes (a‐MWCNTs) were successfully prepared by wet impregnation and calcined at 200 °C and noted as Fe 2 O 3 /MWCNTs and Ag 2 O‐Fe 2 O 3 /MWCNTs, respectively. These samples were characterized using techniques such as TEM, FTIR, N 2 adsorption at ‐196 °C, and XRD. Their catalytic performances were determined through Fenton oxidation process of maxilon red dye (MR) at 25 °C. Fenton degradation results disclosed that the Ag 2 O‐Fe 2 O 3 /MWCNTs nanocomposite has the superior and the faster catalytic degradation rate of dye. This result was due to the synergistic effect that established from the combination of tiny amount of Ag 2 O with Fe 2 O 3 over a‐MWCNTs support, which prevents the agglomeration of catalyst nanoparticles and enhances the adsorption of dye molecules. A full degradation of dye was obtained within 10 min at 25 °C and the Fenton oxidation capability of Fe 2 O 3 /MWCNTs catalyst increased by about 10% after loading ~1wt.% of Ag 2 O. The catalytic performance was considerably based on pH of solution, H 2 O 2 concentration, and dye concentration. The reusability tests confirmed that Ag 2 O‐Fe 2 O 3 /MWCNTs nanocomposite offers high stability over three consecutive cycles, where over 90% degradation of MR dye was obtained. Finally, Ag 2 O‐Fe 2 O 3 /MWCNTs nanocomposite showed excellent Fenton catalytic oxidation and reusability as compared with Fe 2 O 3 /MWCNTs composite in Fenton‐like processes.