Synergistic CO2 reduction and tetracycline degradation by CuInZnS-Ti3C2Tx in one photoredox cycle

Résumé fourni par la source

Optimizing photocatalytic CO 2 reduction with simultaneous pollutant degradation is highly desired. However, the photocatalytic efficiency is restricted by the unmatched redox ability, high carriers’ recombination rate, and lack of reactive sites of the present photocatalysts. Herein, the CuInZnS-Ti 3 C 2 T x hybrid with matched redox ability and suitable CO 2 adsorption property was rationally synthesized. The nucleation and growth process of CuInZnS was interfered by the addition of Ti 3 C 2 T x with a negative charge, resulting in thinner nanosheets and richer reactive sites. Besides, the Schottky heterojunction built in the hybrid simultaneously improved the photoexcited charge transfer property, sunlight absorption range, and CO 2 adsorption ability. Consequently, upon exposure to sunlight, CuInZnS-Ti 3 C 2 T x exhibited an efficient photocatalytic CO 2 reduction performance (10.2 µmol·h −1 ·g −1 ) with synergetic tetracycline degradation, obviously higher than that of pure CuInZnS. Based on the combination of theoretical calculation and experimental characterization, the photocatalytic mechanism was investigated comprehensively. This work offers a reference for the remission of worldwide energy shortage and environmental pollution problems.

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