Pyrene and fluoranthene, typical polycyclic aromatic hydrocarbons, are very difficult to be removed from water due to their hydrophilic nature and relatively low reactivity towards ozone. In the study, Ce-loaded activated carbon (Ce-AC) is prepared and used as catalyst to promote pyrene and fluoranthene degradation by ozone. The catalytic activity of Ce-AC is investigated under various experiment conditions. Results indicate both of pyrene and fluoranthene removals are significantly enhanced in Ce-AC + O 3 due to effective generation of hydroxyl radicals ( OH), as compared to ozonation alone and AC + O 3 . The mineral matter present in the activated carbon positively contributes to remove fluoranthene and the optimized cerium loading of AC is 0.3% in ozonation process. Moreover, the toxicity of pyrene is more than that of fluoranthene and the reaction solution's toxicity is substantially reduced by catalytic ozonation with Ce-AC.
Polycyclic aromatic hydrocarbons (PAHs) in soil are potentially harmful to human health. However, the use of photocatalysis technology to treat soil contaminated with PAHs remains challenging. Therefore, TiO 2 /α-FeOOH composite photocatalyst has been synthesized by hydrothermal method and sol–gel method and applied to photocatalytic degradation of fluoranthene in soil. The morphology, elements, crystal structure, optical properties, electrochemical characteristics, and photocatalytic activity of TiO 2 /α-FeOOH have been characterized. Results showed that TiO 2 is tightly fixed on the surface of α-FeOOH, and TiO 2 /α-FeOOH had higher photocatalytic activity on photocatalytic degradation of fluoranthene in soil under simulated sunlight. The degradation efficiency of TiO 2 /α-FeOOH is 3.0 and 4.8 times higher than that of TiO 2 and α-FeOOH, respectively. This is attributed to enhanced photocatalytic ability by enhancing the transfer capacity of electrons and holes and broadening the spectrum absorption range. The highest degradation efficiency was achieved when the pH of the soil is neutral, the ratio of water/soil is 10:1, and the dosage of catalyst is 50 mg/g. In addition, it was proved that •O 2 − , h + , and 1 O 2 are the main active substances in the photocatalysis of TiO 2 /α-FeOOH. The possible mechanism of a Z-type electron transfer structure was also proposed. The degradation products of fluoranthene were detected, and the degradation pathway was deduced.
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