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.

BACKGROUND: Simultaneous removal of arsenic and fluoride anions from water by adsorption remains a challenge for environmental remediation practice. To address this issue, four mesoporous bimetallic oxides (MBOs) were prepared via the evaporation-induced self-assembly (EISA) method and studied as adsorbents for the co-uptake of arsenate (As(V)) and fluoride (F − ) from synthetic wastewater. Adsorption envelope and equilibrium experiments were performed to investigate the adsorption behaviors and properties.RESULTS: These composites possessed high surface areas (e.g. 200 m 2 g −1 for meso-Ti/Al) and well-defined mesopores, enabling high adsorption capacities for both As(V) and F − . The maximum adsorption capacities of mesoporous titanium-lanthanum oxide (meso-Ti/La) were as high as 81.42 mg g −1 and 44.37 mg g −1 for As(V) and F − , respectively. Surface complexation modeling indicates that As(V) removal mainly involved bidentate surface complexation with surface ≡Me-OH, while F − was retained by formation of monodentate surface complexes. CONCLUSION: The removal mechanisms were confirmed by X-ray photoelectron spectroscopy. These MBOs were found to be effective for simultaneous removal of arsenic and fluoride from water. This study also demonstrated that the incorporation of multi-components and mesoporosity into one composite is an efficient strategy for design and application of high-efficiency adsorbents for environmental remediation of aqueous contaminants.