Abstract
The present study focuses on the use of waste coal fly ash (CFA) for preparing magnetic photocatalyst (MnFe2O4/CFA) and its application of dye degradation from water. The MnFe2O4/CFA photocatalyst was synthesized through a facile hydrothermal method and characterized by various techniques for its structural, morphological, and photocatalytic properties. The MnFe2O4/CFA nanocomposite was used for photocatalytic degradation of methylene blue (MB) under sunlight. Detailed studies for various parameters such as pH, catalyst dose, initial dye concentration, oxidant concentration, and time on photocatalytic degradation were analyzed. The degradation efficiency reached ~ 100% under sunlight within 30 min by the MnFe2O4/CFA nanocomposite. The degradation/removal efficiency of MB was found in the order MnFe2O4/CFA (99.9%) > CFA (61%) > MnFe2O4 (56%) under optimum conditions for composite at pH = 3, composite dose 60 mg/L, and oxidant dose 0.8 mM. The MnFe2O4/CFA is a promising visible-light-active photocatalyst and can be reused several times without significant loss in photocatalytic degradation efficiency.
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