Using citric acid (CA) and 1,5-naphthalenedisulfonic acid (NDSA) as the structure-directing agent, a hierarchical flower-like Bi2O2CO3 product is successfully prepared via a simple one-step hydrothermal synthesis, which is spirally assembled by the {001} facet-dominated nanosheets. It is testified that the additive CA plays an important inducing role in forming the chemical composition of Bi2O2CO3, the nanosized sheet-type subunits, and the exposure of {001} facet, while the NDSA greatly improves the dispersity and porous structure of the Bi2O2CO3 microflower. Due to the nano-size effect and distortion of surface Bi-O bonds, the Bi2O2CO3 microflower could be excited by the visible light to exhibit a superior photocatalytic performance in the degradation of tetracycline (TC). Besides, it is found the exposed {001} facet of Bi2O2CO3 would preferentially generate holes during the illumination process, thus enhancing the photooxidative activity of the Bi2O2CO3 microflower. Finally, the structural and optical features of the Bi2O2CO3 microflower have been discussed in detail, and its photocatalytic mechanism has also been proposed in this work.

中文翻译：

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具有{001}主面的多级纳米片组装Bi2O2CO3微花的一步水热合成及其优越的光催化性能

以柠檬酸 (CA) 和 1,5-萘二磺酸 (NDSA) 作为结构导向剂，通过简单的一步水热合成成功制备了分层花状 Bi2O2CO3 产品，该产品由 {001 } 以面为主的纳米片。证明添加剂CA在形成Bi2O2CO3的化学成分、纳米片状亚基和{001}面的暴露方面起着重要的诱导作用，而NDSA大大改善了Bi2O2CO3微花的分散性和多孔结构. 由于纳米尺寸效应和表面 Bi-O 键的扭曲，Bi2O2CO3 微花可以被可见光激发，在四环素 (TC) 的降解中表现出优异的光催化性能。除了，发现Bi2O2CO3暴露的{001}面在光照过程中会优先产生空穴，从而增强Bi2O2CO3微花的光氧化活性。最后，详细讨论了 Bi2O2CO3 微花的结构和光学特征，并提出了其光催化机理。