A series of ultrathin BiOCl 2D nanosheet photocatalysts were prepared by the TBAOH-assisted hydrolysis method in water. The effects of tetrabutylammonium hydroxide (TBAOH) dosages, chlorine source, preparation pH value, ultrasonic treatment, and magnetic stirring on the photocatalytic degradation dynamics of carbamazepine were examined under visible-light irradiation to optimize the preparation parameters. It was found that ultrathin BiOCl prepared with TBAOH dosages of 1 mmol and chlorine source of NaCl in the pH of 2 upon magnetic stirring of 6 h displayed the highest photocatalytic degradation rate constant (0.0038 min−1) of carbamazepine, which is 7.6 times higher than that with the ordinary BiOCl (without TBAOH). To clarify the mechanism on the outstanding photocatalytic activity of ultrathin BiOCl, the elemental composition/state, micromorphology, and separation efficiency of photogenerated electron-hole pairs were investigated by X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), and photoluminescence (PL). Results showed that the presence of oxygen vacancy, ultrathin nanosheet structure, and improved separation efficiency of photogenerated electron-hole pairs contributed to the excellent photocatalytic degradation activity of ultrathin BiOCl. The obtained result provides a novel method to fabricate ultrathin BiOCl with excellent photocatalytic degradation activity of carbamazepine under visible-light irradiation.

中文翻译：

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超薄 BiOCl 2D 纳米片的可调谐合成用于在可见光照射下有效光催化降解卡马西平

采用TBAOH辅助水解法在水中制备了一系列超薄BiOCl 2D纳米片光催化剂。在可见光照射下研究了四丁基氢氧化铵 (TBAOH) 用量、氯源、制备 pH 值、超声处理和磁力搅拌对卡马西平光催化降解动力学的影响，以优化制备参数。发现用 1 mmol TBAOH 和 NaCl 氯源在磁力搅拌 6 h 条件下制备的超薄 BiOCl 显示出最高的卡马西平光催化降解速率常数（0.0038 min-1），是 7.6 倍与普通的 BiOCl（不含 TBAOH）相比。阐明超薄 BiOCl 优异光催化活性的机理、元素组成/状态，通过 X 射线光电子能谱 (XPS)、扫描电子显微镜 (SEM) 和光致发光 (PL) 研究了光生电子-空穴对的微观形态和分离效率。结果表明，氧空位的存在、超薄纳米片结构和光生电子-空穴对分离效率的提高有助于超薄 BiOCl 优异的光催化降解活性。所得结果为制备在可见光照射下具有优异的卡马西平光催化降解活性的超薄BiOCl提供了一种新方法。结果表明，氧空位的存在、超薄纳米片结构和光生电子-空穴对分离效率的提高有助于超薄 BiOCl 优异的光催化降解活性。所得结果为制备在可见光照射下具有优异的卡马西平光催化降解活性的超薄BiOCl提供了一种新方法。结果表明，氧空位的存在、超薄纳米片结构和光生电子-空穴对分离效率的提高有助于超薄 BiOCl 优异的光催化降解活性。所得结果为制备在可见光照射下具有优异的卡马西平光催化降解活性的超薄BiOCl提供了一种新方法。