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FeOCl Fenton-like catalyst has drawn much attention due to its high catalytic activity. Nevertheless, the potential application of FeOCl is significantly hindered by the sluggish reduction kinetics of Fe3+ to active Fe2+. Here, we report that the incorporation of Fe − O–Mo electron mediator into FeOCl via forming a FeOCl/MoS2 composite can facilitate the Fe2+ regeneration through the oxidation of Mo4+ to Mo6+, which boosts the hydroxyl radicals yields, thus leading to a significantly improved catalytic performance. The removal efficiency of methylene blue (MB, 50 mg L−1) achieves ∼100% within 2 min. with low dosage of FeOCl/MoS2 (0.2 g L−1) and H2O2 (0.6 mM). FeOCl/MoS2 not only has broad working pH range (∼3 − 9) and high salinity tolerance (100 mM), but also capable to degrade various organic pollutants. For practical application, the fabricated FeOCl/MoS2 membrane effectively degrades continuous MB flow. This study demonstrates that incorporating an electron mediator is an effective way to improve the catalytic performance of heterogeneous Fenton-like catalysts.

Polyacrylonitrile fiber (PANF) was modified by alcoholysis reaction and the efficiencies of the PANF and the modified polyacrylonitrile fiber (MPANF) for oil removal were investigated. Fourier transform infrared (FTIR) spectroscopy revealed that new organophilic functional groups were grafted on the fiber surface. Scanning electron microscopy (SEM) showed that the alcoholysis process made the surface of the MPANF rougher than that of the PANF. Oil sorption tests of the PANF and the MPANF for motor oil SAE 30, motor oil SAE 50, and multigrade engine oil (MEO) were carried out in batch tank (in water and in oil without water), and the MPANF showed higher oil sorption capacity compared to the PANF. Dynamic sorption of diesel oil-in-water emulsion (initial oil concentration of 630 mg/dm 3 ) was investigated in coalescing bed. The experiments in the coalescing bed indicated that the MPANF could resist higher interstitial velocity, as compared to the PANF. More than 97% of oil content in the influent stream could be removed by the MPANF bed under the optimum condition. The results indicated that reuse of the PANF as oil sorbent was quite feasible.

Heterogeneous photo-Fenton process using LiFe(WO(4))(2) as catalyst was studied to degrade Methylene blue (MB) dye in aqueous solution. The results indicated that LiFe(WO(4))(2) could effectively catalyze the decolorization of MB in the presence of UV light and H(2)O(2). The effects of different parameters such as amounts of catalyst, H(2)O(2) concentration, initial pH of the dye solution, initial dye concentration and UV light intensity on the decolorization efficiency of the process were investigated. It was found that LiFe(WO(4))(2) possessed a wide applicable pH range. X-ray photoelectron spectroscopy (XPS) was applied to investigate the transformation between Fe(III) and Fe(II). It was also observed that catalytic behavior could be reproduced in consecutive experiments without a considerable drop in the process efficiency.