▎ 摘　　要

A magnetized nano-photocatalyst based on TiO2/magnetic graphene was developed for efficient photodegradation of crystal violet (CV). Scanning electron microscopy, X-ray diffraction, energy-dispersive X-ray spectroscopy and elemental mapping were used to characterize the prepared magnetic nano-photocatalyst. The photocatalytic activity of the synthesized magnetic nano-photocatalyst was evaluated using the decomposition of CV as a model organic pollutant under UV light irradiation. The obtained results showed that TiO2/magnetic graphene exhibited much higher photocatalytic performance than bare TiO2. Incorporation of graphene enhanced the activity of the prepared magnetic nano-photocatalyst. TiO2/magnetic graphene can be easily separated from an aqueous solution by applying an external magnetic field. Effects of pH, magnetized nano-photocatalyst dosage, UV light irradiation time, H2O2 amount and initial concentration of dye on the photodegradation efficiency were evaluated and optimized. Efficient photodegradation (>98%) of the selected dye under optimized conditions using the synthesized nano-photocatalyst under UV light irradiation was achieved in 25min. The prepared magnetic nano-photocatalyst can be used in a wide pH range (4-10) for degradation of CV. The effects of scavengers, namely methanol (OH center dot scavenger), p-benzoquinone (O-2(center dot-) scavenger) and disodium ethylenediaminetetraacetate (hole scavenger), on CV photodegradation were investigated.