Nano Sensor Group, Institute of Nanoscience and Nanotechnology, Kafrelsheikh University, Kafr ElSheikh, 33516, Egypt.
Environ Sci Pollut Res Int. 2023 Nov;30(55):117909-117922. doi: 10.1007/s11356-023-30010-z. Epub 2023 Oct 24.
Recently, low-cost graphitic carbon nitride (g-CN) revealed high photocatalytic activities and provided solutions to environmental pollution. In this study, we synthesized brown mesoporous 2D g-CN by calcination dicyandiamide with pluronic P123. This is followed by loading of Ag NPs on the prepared 2D g-CN by photodeposition process. After that, a ternary composite 2% Ag/ 2D g-CN / g-CN QDs heterojunction photocatalyst has been successfully prepared. The prepared nanomaterials were comprehensively characterized by various analysis techniques such as XRD, UV-Vis., BET, XPS, SEM, TEM. This new system exhibited a large surface area with porous structure and a wide absorption of visible light. The results verified that Ag NPs decoration enhanced the charge separation of photo-generated carriers of g-CN 2D and g-CN QDs, promote significant enhancement in the photocatalytic activity for reduction of p-nitrophenol with a rate constant (k) value of 0.49729 / min in 6 min. This rate is about two-fold higher than that observed for pure g-CN 2D and g-CN QDs as well as shows an improvement compared to 2% Ag/ g-CN 2D and g-CN 2D/ g-CN QDs. The results open the door to design highly efficient 2D/0D nanocomposite photocatalysts for a wide variety of environmental applications.
最近，低成本的石墨相氮化碳（g-CN）显示出了很高的光催化活性，并为解决环境污染问题提供了方案。在本研究中，我们通过用三聚氰胺与 Pluronic P123 共煅烧合成了棕色介孔二维 g-CN。接着，通过光沉积法将 Ag NPs 负载到制备的二维 g-CN 上。之后，成功制备了三元复合 2%Ag/二维 g-CN/g-CN QDs 异质结光催化剂。通过各种分析技术（如 XRD、UV-Vis.、BET、XPS、SEM、TEM）对制备的纳米材料进行了综合表征。该新体系具有大的表面积、多孔结构和对可见光的宽吸收。结果证实，Ag NPs 的修饰增强了二维 g-CN 和 g-CN QDs 光生载流子的电荷分离，使还原对硝基苯酚的光催化活性显著提高，在 6 分钟内的速率常数（k）值为 0.49729 / min。这一速率大约是纯二维 g-CN 和 g-CN QDs 的两倍，并且比 2%Ag/二维 g-CN 和二维 g-CN/g-CN QDs 都有所提高。这些结果为设计高效的二维/零维纳米复合光催化剂以用于各种环境应用开辟了道路。
