In this study, ZnIn₂S₄ with oxygen vacancies was fabricated using NaBH₄-assisted hydrothermal method to enhance the photocatalytic activities. The generated ZIS and ZISVo-x samples exhibited microspherical nanosheet structure and it is proven that NaBH₄ could enhance the amount of oxygen vacancies in ZnIn₂S₄ as confirmed by XPS analysis. Upon solar light irradiation, ZISVo-5 sample performed a fast photodegradation of tetracycline (TC) within 10 min and simultaneously exhibited a hydrogen evolution amount of ∼ 12 mmol (AQE = 6.07 at 420 nm), which is 2.75 times higher than that of pristine ZnIn₂S₄ (4.4 mmol). The degraded products of TC were further identified using LC-MS. The excellent photocatalytic HER performance was attributed to the optimum amount of oxygen vacancies in ZISVo-5 sample and the reactive oxygen species of •OH, O₂^•-, and ¹O₂ as confirmed by ESR analysis under light irradiation played a vital role for the rapid degradation of TC by ZISVo-5.

中文翻译：

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通过原位氧空位 ZnIn2S4 促进光催化氢生成和四环素的光破坏


在本研究中，使用 NaBH₄ 辅助水热法制备了具有氧空位的 ZnIn₂S₄，以增强光催化活性。生成的 ZIS 和 ZISVo-x 样品表现出微球形纳米片结构，XPS 分析证实 NaBH₄ 可以增加 ZnIn₂S₄ 中的氧空位量。在太阳光照射下，ZISVo-5 样品在 10 分钟内对四环素 （TC） 进行了快速光降解，同时表现出 ∼ 12 mmol 的析氢量（AQE = 6.07 在 420 nm 处），比原始 ZnIn₂S₄ （4.4 mmol） 高 2.75 倍。使用 LC-MS 进一步鉴定 TC 的降解产物。ZISVo-5 样品中氧空位的最佳量归因于 ZISVo-5 样品中优异的光催化 HER 性能，光照射下 ESR 分析证实的 •OH、O₂^•- 和 ¹O₂ 活性氧对 ZISVo-5 快速降解 TC 起着至关重要的作用。