Ultrafast plasma immersion strategy for rational modulation of oxygen-containing and amino groups in graphitic carbon nitride
Ultrafast plasma immersion strategy for rational modulation of oxygen-containing and amino groups in graphitic carbon nitride
复制标题
合理调控石墨氮化碳中含氧基团和氨基的超快等离子体浸没策略
DOI：
10.1016/j.carbon.2019.12.022
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发表时间：
2020-04-15
期刊：
影响因子：
10.9
通讯作者：
Cui, Lifeng
中科院分区：
文献类型：
--
作者：
Kang, Shifei;He, Maofen;Cui, Lifeng
聚合物半导体石墨碳氮化物（g-CN）中含氧基团和氨基的共调制日益成为先进催化、能源和生物医学应用的共同关注点。深入了解含氧基团和氨基在g-CN聚合物结构中的存在状态以及调控这些基团的可控方法是非常必要的。在此，一个合理的工业上适用的等离子体策略的设计和应用于可控调制的含氧基团和氨基在g-CN在10分钟内。X射线衍射，傅里叶变换红外光谱，和X射线光电子能谱的结果表明，含氧基团和氨基可控引入等离子体处理后。透射电子显微镜、原子力显微镜和N2吸附-脱附测量验证了优化的g-CN-O-NH 2的超薄和二维面内介孔形貌。结果表明，合理的g-CN-O-NH 2在Cr（VI）光还原、光催化细菌消毒和肿瘤细胞灭活方面表现良好。可见光下激发态的荧光强度明显减弱，荧光寿命延长，这是由于光催化剂内部-NH 2和OH-基团的优势内缘位富集和理想的联合作用，使载流子快速转移所致。这项工作提供了一个令人印象深刻的工业上适用的策略，为结构优化和功能基团调制的聚合物材料，以提高电子和催化性能。(C)2019爱思唯尔有限公司版权所有。
The co-modulation of the oxygen-containing and amino groups in the polymeric semiconductor graphitic carbon nitride (g-CN) has increasingly become a common concern toward advanced catalysis, energy and biomedicine applications. The intensive understanding of the existence state of oxygen-containing and amino groups in the polymeric structure of g-CN and the controllable methods of modulating these groups is highly desirable. Herein, a rational industrially applicable plasma strategy was designed and applied for controllable modulation of oxygen-containing and amino groups in g-CN within 10 min. X-ray diffractometry, Fourier transform infrared spectrometry, and X-ray photoelectron spectroscopy results indicated that the oxygen-containing and amino groups were controllably introduced after plasma treatment. Transmission electron microscopy, atomic force microscopy and N-2 adsorption-desorption measurements verified the ultra-thin and two-dimensional in-plane mesoporous morphology of the optimized g-CN-O-NH2. As a result, the rational g-CN-O-NH2 performed well in Cr(VI) photoreduction, photocatalytic bacterial disinfection and inactivation of tumor cells. The remarkable extensively applicable photocatalytic activity can be ascribed to the fast charge carrier transfer benefiting from the enriched preferable internal edge sites and ideal joint effect of internal -NH2 and OH- groups, as confirmed by the significantly weakened PL fluorescence intensity and prolonged fluorescence lifetime of the excited states under visible light irradiation. This work provides an impressive industrially applicable strategy for the structure optimization and functional groups modulation of polymeric materials towards enhanced electronic and catalytic performances. (C) 2019 Elsevier Ltd. All rights reserved.