Induced effects of advanced oxidation processes

Scientific Reports (Impact Factor: 5.58). 02/2014; 4:4018. DOI: 10.1038/srep04018
Source: PubMed


Hazardous organic wastes from industrial, military, and commercial activities represent one of the greatest challenges to human beings. Advanced oxidation processes (AOPs) are alternatives to the degradation of those organic wastes. However, the knowledge about the exact mechanisms of AOPs is still incomplete. Here we report a phenomenon in the AOPs: induced effects, which is a common property of combustion reaction. Through analysis EDTA oxidation processes by Fenton and UV-Fenton system, the results indicate that, just like combustion, AOPs are typical induction reactions. One most compelling example is that pre-feeding easily oxidizable organic matter can promote the oxidation of refractory organic compound when it was treated by AOPs. Connecting AOPs to combustion, it is possible to achieve some helpful enlightenment from combustion to analyze, predict and understand AOPs. In addition, we assume that maybe other oxidation reactions also have induced effects, such as corrosion, aging and passivation. Muchmore research is necessary to reveal the possibilities of induced effects in those fields.

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    ABSTRACT: In this study, schwertmannite was used as heterogeneous Fenton-like catalyst for nitrobenzene degradation in a closed batch system. The properties of catalyst samples were characterized by measuring the specific area (SBET), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and X-ray diffraction (XRD). The catalytic activity was evaluated in view of the effect of various conditions (initial pH value, catalyst dosage, H2O2 concentration). The results showed that the removal efficiency of nitrobenzene was significantly enhanced in the presence of schwertmannite and the catalyst retained almost its high catalytic activity after 5 consecutive runs. The optimum pH value in this study was found to be 3.0 and the optimal concentration of H2O2 was 500mg/l. The removal of the nitrobenzene could be achieved 92.5% in 30min at initial conditions. The mechanism of catalytic oxidation was radical mechanism via the catalysis of schwertmannite to form hydroxyl radicals by decomposing H2O2. In addition, nitrophenols were the main transformation products detected by liquid chromatography and mass spectrometric (LC/MS).

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