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(NO3)3. The specific surface area of Fe@CC determined by N2 adsorption–desorption Brunauer–Emmett–Teller method was up to 1325.5 m2/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 H2O2 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.
Highlights
Fenton reaction is one of the extensively studied advanced oxidation process that is effective for pollutants treatment [1,2,3,4,5]
The results suggested that the prepared Fe oxide loaded on carbon cloth (Fe@CC) showed higher specific surface area by 81.8% compared with that of carbon cloth, which suggested that FeOOH
HNO3 could be decomposed as shown in Equation (1), and Fe(OH)3 stacked on the surface of carbon cloth could be dehydrated to form FeOOH and Fe2 O3 according to Equations (2) and (3)
Summary
Fenton reaction is one of the extensively studied advanced oxidation process that is effective for pollutants treatment [1,2,3,4,5]. According to the above literatures, iron oxides-based catalysts are potential candidates for heterogeneous Fenton reaction Among these catalysts, a support that could highly disperse the iron oxides particles on its surface and be easy to separate should be its important features. A support that could highly disperse the iron oxides particles on its surface and be easy to separate should be its important features Most of these reported active components reported were loaded on powders that are still difficult to be separated. Carbon cloth (CC), which possesses high specific surface area, higher chemical stability and easy to be separated and regenerated once deactivated, were used as a support to prepare high active iron oxides (mainly FeOOH) loaded catalysts to improve the exposure of surficial active sites for heterogeneous Fenton reaction. The Fenton-like reaction results showed that this catalyst was highly active and stable
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