Fabrication of tantalum-based composite photocatalysts with high-performance for dealing with organic pollutants remains valuable and highly urgent nowadays. In this work, amorphous In 2 S 3 decorated Ta 2 O 5-x mesocrystals were fabricated for tetracycline degradation under visible-light irradiation. The introduction of amorphous In 2 S 3 highly improved the visible-light absorption and charge separation, and the prepared In 2 S 3 /Ta 2 O 5-x mesocrystals showed highly enhanced photocatalytic performance towards tetracycline degradation, and the corresponding rate constant was approximately 0.00658 min −1 , which was 5.58 times that of In 2 S 3 and 3.64 times that of Ta 2 O 5-x mesocrystals. The enhanced visible-light photocatalytic performance for the In 2 S 3 /Ta 2 O 5-x mesocrystals was mainly attributed to the fabrication of strongly combined interface between In 2 S 3 and Ta 2 O 5-x mesocrystals.
Mesocrystals are types of fascinating multifunctional materials in fabricating rapid charge transport pathways, and surface engineering could be considered as a significant influencing factor in boosting charge separation for efficient photocatalytic application. In this work, surface engineered Ta 2 O 5−x mesocrystals were synthesized by facile alkali treatment strategy for enhanced visible light photocatalytic tetracycline degradation. The highly enhanced photocatalytic activity could be attributed to the highly increased surface areas and surface hydroxyl groups to compare with those of commercial Ta 2 O 5 and pristine Ta 2 O 5−x mesocrystals, which could provide more surface reactive sites and high electron density center for trapping photo-generated holes. Besides, possible tetracycline transformation pathways over surface engineered Ta 2 O 5−x mesocrystals and visible light photocatalytic mechanism were also proposed in this work. Current work also provides a facile strategy for regulating surface property of ultrawide bandgaps semiconductors for enhanced visible light photocatalytic performance.
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