Bi Xiang, Wang Li-Zhong, Zhai Dong-Hua, Wang Lei, Yang Hui, Du Gao-Hui
Institute of Intelligent Pharmaceutical and Chemical New Materials, Taizhou Polytechnic College, Taizhou, 225300, China.
Materials Institute of Atomic and Molecular Science, Shaanxi University of Science and Technology, Xi'an, 710021, China.
Sci Rep. 2025 Jun 5;15(1):19864. doi: 10.1038/s41598-025-03286-z.
In-situ synthesis of g-CN containing nitrogen vacancies and cyano group via one-pot method using urea as the precursor. The structural, morphological or electrochemical properties of synthesized photocatalysts were characterized by XRD, BET analysis, TEM, FTIR, UV-DRS, PL, XPS and EPR. It was found that the nitrogen vacancy was successfully introduced into g-CN. Compared to pure g-CN, the (200) crystal plane in XRD of synthesized g-CN showed slight red-shift, and the BET surface areas had changed from 27.5 to 35.7 m·g, which could provide more reaction center and active site. TEM confirmed that g-CN and V-g-CN were porous materials, and FTIR, XPS as well as EPR could prove the presence of nitrogen vacancies and cyano group. The UV-Vis absorption edge of V-g-CN demonstrated briefly red-shift, PL intensity and lifetime of carriers declined in comparison with pure g-CN. Electrochemical test results showed that enhanced charge separation efficiency and low recombination rate of charge carriers of V-g-CN. The photocatalytic activity of the photocatalysts was researched by RhB degradation and ACT removal under visible light irradiation, the results showed the rate of RhB degradation on the V-g-CN was 81%, which was 1.4-fold as high as that of g-CN in visible light. The degradation contribution from the active species were h (67.3%) >O(63.0%)>•OH (49.4%) >•O (20.3%) > e (20.1%) > HO(0.2%), and V-g-CN exhibited excellent ACT removal rate, which was 1.6-fold higher than that of pure g-CN in visible light. This study provides an efficient photocatalyst for the treatment of toxic wastewater.
以尿素为前驱体，通过一锅法原位合成含氮空位和氰基的g-CN。采用XRD、BET分析、TEM、FTIR、UV-DRS、PL、XPS和EPR对合成的光催化剂的结构、形貌或电化学性质进行了表征。结果表明，氮空位成功引入到g-CN中。与纯g-CN相比，合成的g-CN的XRD中(200)晶面出现轻微红移，BET表面积从27.5变为35.7 m²·g，这可以提供更多的反应中心和活性位点。TEM证实g-CN和V-g-CN是多孔材料，FTIR、XPS以及EPR可以证明氮空位和氰基的存在。V-g-CN的紫外-可见吸收边有轻微红移，与纯g-CN相比，PL强度和载流子寿命下降。电化学测试结果表明，V-g-CN的电荷分离效率提高，电荷载流子复合率降低。通过可见光照射下RhB降解和ACT去除研究了光催化剂的光催化活性，结果表明V-g-CN上RhB的降解率为81%，在可见光下是g-CN的1.4倍。活性物种的降解贡献为h⁺(67.3%)＞O₂(63.0%)＞•OH(49.4%)＞•O₂⁻(20.3%)＞e⁻(20.1%)＞HO₂⁻(0.2%)，V-g-CN表现出优异的ACT去除率，在可见光下比纯g-CN高1.6倍。该研究为有毒废水的处理提供了一种高效的光催化剂。
