A distinct hollow spindle-like CdIn2S4 photocatalyst for high-efficiency tetracycline removal

Due to the massive release of antibiotics into the environment, it is of great emergency to find an effective approach to deal with antibiotic-containing wastewater. Photocatalytic technology, benefiting from its low cost and high efficiency, is deemed to be an appealing strategy. Photocatalytic-induced production of reactive oxygen species (ROS) is a promising but challenging prospect in water purification and environmental remediation. Herein, we fabricated a spindle-like hollow CdIn₂S₄ (HCIS) photocatalytic system for high-efficiency tetracycline removal. Targeting MIL-88A (Fe) as a template, the obtained CdIn₂S₄ photocatalysts reserved intrinsic spindle-like morphology. Compared with Bulk CdIn₂S₄ (BCIS), this unique hollow structure enhanced light absorption capacity and boosted carriers separation. As a result, the photodegradation efficiency reached over 94.5% within 40 min under visible light illumination. The degradation rate constant was four times higher than that of pristine CdIn₂S₄. We believe this work will endow some lights for the design of hollow catalysts in other environmental applications.