Graphical abstract: (maximum size 8cm x 4cm.) Text: one sentence: (of maximum 20 words, highlighting the novelty of the work.)The photo-Fenton process of PB/TiO 2 nanocomposites to degrade various organic pollutants was firstly investigated with Mössbauer spectroscopy and EPR.
ABSTRACTNowadays, lots of researches focus on accelerating the Fe II /Fe III redox cycles to increase the pseudo first-order rates of Fenton reaction. Here Prussian blue/titanium dioxide nanocomposites (PB/TiO 2 NPs) were firstly designed as heterogeneous photo-Fenton catalyst to increase the Fe II recovery in degrading organic contaminants in water. The PB/TiO 2 NPs were characterized by various analytical techniques to obtain optimum ratio of PB and TiO 2 for efficient degradation of organics. The performance of the catalysts was tested by following the removal of rhodamine B dye, salicylic acid, m-cresol, and isophorone under various conditions (pH, ratios of PB and TiO 2 , H 2 O 2 , and temperature). Formation of the intermediates of iron (Fe II /Fe III ) in the studied system using Mössbauer spectroscopy was explored for the first time and presents important insights on the relevant catalytic phenomena. The generation of • OH radicals in the reaction system was identified using electron paramagnetic resonance spectroscopic techniques. Results demonstrated that the developed PB/TiO 2 NPs were stable and could degrade organic contaminants in water efficiently.
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