Carbon-doped �ower-like Bi2WO6 decorated carbon nanosphere nanocomposites with enhanced visible light photocatalytic degradation of tetracycline

In search of a recyclable catalyst with synergistic adsorption and photocatalysis, unique composite photocatalysts of �ower-like bismuth tungstate (Bi 2 WO 6 ) and carbon nanospheres (CSs) were synthesized using a hydrothermal synthesis method (named CSs-Bi 2 WO 6 ). Based on the large speci�c surface area and a reasonable band gap (2.53 eV), CSs-Bi 2 WO 6 have good photocatalytic properties. For example, the composite with an optimized ratio (2 wt% CSs-Bi 2 WO 6 ) showed good adsorption and photocatalytic performance. Under visible light irradiation, the photodegradation rate of tetracycline (TC) by adding 2% CSs is 25% higher than that of pure Bi 2 WO 6 . After �ve cycles, the observed barely decreased TC degradation rate of 2% CSs-Bi 2 WO 6 con�rmed the high cyclability and reproducibility of the photocatalyst. The CSs greatly improved the adsorption of pollutants and reduced the recombination rate of photogenerated electrons and holes of the Bi 2 WO 6 . This study provides a promising new method for the e�cient removal of organic pollutants.

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