School of Chemistry and Environmental Engineering, Hubei Key Laboratory of Novel Reactor and Green Chemistry Technology, Wuhan Institute of Technology, Donghu New & High Technology Development Zone, Wuhan, 430205, PR China.
School of Chemical Engineering, Hubei University of Arts and Science, Xiangyang, 441053, PR China.
Chemosphere. 2021 Feb;264(Pt 1):128434. doi: 10.1016/j.chemosphere.2020.128434. Epub 2020 Sep 28.
N-doped carbon quantum dots (NCQDs) decorated BiOCO heterojunction nanosheets have been successfully constructed by a facile hydrothermal method. The obtained NCQDs/BiOCO heterojunction exhibits a wide-spectrum absorption ability and remarkably enhanced photocatalytic activities for ciprofloxacin photodegradation from ultraviolet to near-infrared region. The critical roles of NCQDs and two different charge separation and transfer processes of NCQDs/BiOCO heterojunction under different light irradiations have been elucidated. Upon UV light irradiation, NCQDs act as electron reservoirs and a Z-scheme charge transfer process between BiOCO and NCQDs promotes electrons transfer and •O reactive species generation. Under visible and NIR light irradiation, NCQDs act as photosensitizer (hole reservoirs) to harvest solar light and a type-II heterojunction leads to an efficient charge carrier separation and thus high catalytic ability. The mechanisms and pathways of ciprofloxacin degradation driven by different lights are discussed accordingly. This work provides a versatile pathway to well design an efficient wide-spectrum response photocatalyst.
氮掺杂碳量子点（NCQDs）修饰的 BiOCO 异质结纳米片通过简便的水热法成功构建。所获得的 NCQDs/BiOCO 异质结具有宽光谱吸收能力，并显著增强了从紫外线到近红外区域的环丙沙星光降解的光催化活性。阐明了 NCQDs 和 NCQDs/BiOCO 异质结在不同光照下的两种不同电荷分离和转移过程的关键作用。在紫外光照射下，NCQDs 充当电子储存器，并且 BiOCO 和 NCQDs 之间的 Z 型电荷转移过程促进电子转移和•O 活性物质的生成。在可见光和近红外光照射下，NCQDs 充当光致剂（空穴储存器）以收集太阳光，并且 II 型异质结导致有效的载流子分离，从而具有高催化能力。相应地讨论了不同光照驱动下环丙沙星降解的机制和途径。这项工作为设计高效宽光谱响应光催化剂提供了一种通用途径。
