Facile synthesis of Ag2O-TiO2/sepiolite composites with enhanced visible-light photocatalytic properties

doi:10.1016/S1872-2067(15)61015-4

Abstract

Abstract:

Ag₂O-TiO₂/sepiolite heterostructure composites were synthesized by a simple two-step method at low temperatures (100-450 ℃). Acid red G aqueous solution and gaseous formaldehyde were chosen as model organic pollutants to evaluate the photocatalytic performance of the as-prepared composites. The results showed that the Ag₂O-TiO₂/sepiolite exhibited enhanced photocatalytic activity over pure Ag₂O-TiO₂, TiO₂/sepiolite, and Ag₂O/sepiolite under visible-light irradiation (λ > 420 nm). The excellent photocatalytic efficiency of these composites can be ascribed to the synergistic effect between the heterojunction and the porous structure of the clay layers, which induced high adsorption and efficient charge separation. In addition, the active species involved in the degradation reaction have been investigated by photoluminescence spectroscopy and quenching experiments. A possible photocatalytic degradation mechanism of acid red G dye by the Ag₂O-TiO₂/sepiolite composite is also discussed.

Key words: Silver oxide, Titanium dioxide, Sepiolite, Heterostructure, Photocatalysis, Acid red G, Photocatalytic mechanism

Yu Du, Dandan Tang, Gaoke Zhang, Xiaoyong Wu. Facile synthesis of Ag₂O-TiO₂/sepiolite composites with enhanced visible-light photocatalytic properties[J]. Chinese Journal of Catalysis, 2015, 36(12): 2219-2228.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(15)61015-4

https://www.cjcatal.com/EN/Y2015/V36/I12/2219

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Facile synthesis of Ag₂O-TiO₂/sepiolite composites with enhanced visible-light photocatalytic properties

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