Fe Oxides Loaded on Carbon Cloth by Hydrothermal Process as an Effective and Reusable Heterogenous Fenton Catalyst

Abstract

Iron based heterogeneous Fenton catalysts are attracting much attention for its economic and environmental friendly characteristics. In this study, iron oxides loaded carbon cloth (assigned as Fe@CC) was prepared using hydrothermal hydrolysis of Fe(NO 3 ) 3 . The specific surface area of Fe@CC determined by N 2 adsorption-desorption Brunauer-Emmett-Teller method was up to 1325.5 m 2 /g, which increased by 81.8% compared with that of native carbon cloth mainly due to the loading of iron oxide. XPS (X-ray photoelectron spectroscopy) spectra confirmed that the iron oxide on the carbon surface included mainly FeOOH. Its heterogeneous Fenton-like activity was determined using Acid Red G as a model substrate for degradation. Fe@CC maintained high and relatively stable activity during 11 tests, and it showed high COD (Chemical Oxygen Demand) removal efficiency and high apparent H 2 O 2 utilization efficiency. The homogeneous Fenton reaction using the amount of leached Fe(III) suggested that the surficial reaction on Fe@CC was dominant. The stability and the mechanism for gradual decrease of activity during the first 4 tests were also discussed.

Kinetic and Mechanistic Study on Catalytic Decomposition of Hydrogen Peroxide on Carbon-Nanodots/Graphitic Carbon Nitride Composite

“…H 2 O 2 is one of the most common sources of HO• in the presence of metal salt solution, carbon-based species, metal or metal oxide via Fenton/Fenton-like reaction, electron-transfer mechanism or catalytic decomposition on the solid-liquid interface [18,[20][21][22][23][24]. The well-known Fenton/Fenton-like reaction may occur in both homogeneous and heterogeneous system according to many works [18,[20][21][22][23]. Similar to the Fenton reaction, HO• and HO 2 • can be formed on the surface of carbon-based catalysts via the electron-transfer mechanism due to the donor-acceptor properties of the carbon surface.…”

Metal-Functionalized Hydrogels as Efficient Oxygen Evolution Electrocatalysts

“…XPS spectra of all Fe-functionalized hydrogels also show peaks at 712.8, 736.9, 725.2, and 729.8 eV that are due to Fe 2p of Fe 3+ species (Figures e, S17e and S18b). ,, However, the XPS spectra of all Co-functionalized hydrogels (Figures f, S17f, and S18c) show very small peaks associated with Co 2p, further corroborating the low amount of Co present in them.…”

“…High-resolution XPS spectra of O 2p of the pristine hydrogel (Figures c and S17c) show peaks at 530.6 and 532.3 eV corresponding to OC and O–P groups, respectively . The spectrum of Fe-functionalized hydrogel also shows a peak at 532.1 eV associated with O 2p of O–Fe bonds in the hydrogel. − In addition, the one for Co-functionalized hydrogel shows a peak at 532.9 eV due to O 2p in O–Co bonds in the hydrogel . The corresponding spectra of Fe- and Co-cofunctionalized hydrogels show similar peaks attributable to O–Fe/Co groups, which can form between the metals and the O atoms in PA.…”

Full Bulk‐Structure Reconstruction into Amorphorized Cobalt–Iron Oxyhydroxide Nanosheet Electrocatalysts for Greatly Improved Electrocatalytic Activity

“…It is easy to understand the oxidation of Co 2+ which is due to its oxygen‐sensitive property. This is also the case for Fe 2p 3/2 XPS spectra, where the relative peak area (Figure S10, green area, Supporting Information) that associated with the electrochemically formed FeOOH gradually increases [ 28 ] and the peak area of Fe 2 O 3 species gradually decreases (Figure S10, orange area, Supporting Information), [ 29 ] as the electrochemical oxidation proceeds. This finding suggests that the more Fe‐OH species are formed and Fe species are converted to FeOOH phase structure, which is consistent with the ex situ Raman results (Figure 4b).…”