一锅法原位合成含氮空位和氰基的g-C3N4以增强光催化活性。

IF 3.9 2区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES
Xiang Bi, Li-Zhong Wang, Dong-Hua Zhai, Lei Wang, Hui Yang, Gao-Hui Du
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引用次数: 0

摘要

以尿素为前驱体,一锅法原位合成含氮空位和氰基的g-C3N4。采用XRD、BET、TEM、FTIR、UV-DRS、PL、XPS和EPR等手段对合成的光催化剂的结构、形貌或电化学性能进行了表征。结果表明,g-C3N4中成功引入了氮空位。与纯g-C3N4相比,合成的g-C3N4的(200)晶面在XRD上出现了轻微的红移,BET表面积从27.5 m2·g-1变化到35.7 m2·g-1,可以提供更多的反应中心和活性位点。TEM证实g-C3N4和VN-g-C3N4为多孔材料,FTIR、XPS和EPR均证实了氮空位和氰基的存在。与纯g-C3N4相比,VN-g-C3N4的紫外-可见吸收边出现了短暂的红移,载流子的PL强度和寿命下降。电化学测试结果表明,VN-g-C3N4的电荷分离效率提高,载流子复合率低。通过可见光下RhB的降解和ACT的去除研究了光催化剂的光催化活性,结果表明,VN-g-C3N4对RhB的降解率为81%,是可见光下g-C3N4的1.4倍。活性菌的降解贡献为h+ (67.3%) >0 O2(63.0%)>•OH(49.4%) >•O2- (20.3%) > e- (20.1%) > H2O2(0.2%), VN-g-C3N4在可见光下对ACT的去除率比纯g-C3N4高1.6倍。本研究为处理有毒废水提供了一种高效的光催化剂。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

In-situ synthesis of g-C<sub>3</sub>N<sub>4</sub> with nitrogen vacancy and cyano group via one-pot method for enhanced photocatalytic activity.

In-situ synthesis of g-C<sub>3</sub>N<sub>4</sub> with nitrogen vacancy and cyano group via one-pot method for enhanced photocatalytic activity.

In-situ synthesis of g-C<sub>3</sub>N<sub>4</sub> with nitrogen vacancy and cyano group via one-pot method for enhanced photocatalytic activity.

In-situ synthesis of g-C3N4 with nitrogen vacancy and cyano group via one-pot method for enhanced photocatalytic activity.

In-situ synthesis of g-C3N4 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-C3N4. Compared to pure g-C3N4, the (200) crystal plane in XRD of synthesized g-C3N4 showed slight red-shift, and the BET surface areas had changed from 27.5 to 35.7 m2·g-1, which could provide more reaction center and active site. TEM confirmed that g-C3N4 and VN-g-C3N4 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 VN-g-C3N4 demonstrated briefly red-shift, PL intensity and lifetime of carriers declined in comparison with pure g-C3N4. Electrochemical test results showed that enhanced charge separation efficiency and low recombination rate of charge carriers of VN-g-C3N4. 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 VN-g-C3N4 was 81%, which was 1.4-fold as high as that of g-C3N4 in visible light. The degradation contribution from the active species were h+ (67.3%) >1O2(63.0%)>•OH (49.4%) >•O2- (20.3%) > e- (20.1%) > H2O2(0.2%), and VN-g-C3N4 exhibited excellent ACT removal rate, which was 1.6-fold higher than that of pure g-C3N4 in visible light. This study provides an efficient photocatalyst for the treatment of toxic wastewater.

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来源期刊
Scientific Reports
Scientific Reports Natural Science Disciplines-
CiteScore
7.50
自引率
4.30%
发文量
19567
审稿时长
3.9 months
期刊介绍: We publish original research from all areas of the natural sciences, psychology, medicine and engineering. You can learn more about what we publish by browsing our specific scientific subject areas below or explore Scientific Reports by browsing all articles and collections. Scientific Reports has a 2-year impact factor: 4.380 (2021), and is the 6th most-cited journal in the world, with more than 540,000 citations in 2020 (Clarivate Analytics, 2021). •Engineering Engineering covers all aspects of engineering, technology, and applied science. It plays a crucial role in the development of technologies to address some of the world''s biggest challenges, helping to save lives and improve the way we live. •Physical sciences Physical sciences are those academic disciplines that aim to uncover the underlying laws of nature — often written in the language of mathematics. It is a collective term for areas of study including astronomy, chemistry, materials science and physics. •Earth and environmental sciences Earth and environmental sciences cover all aspects of Earth and planetary science and broadly encompass solid Earth processes, surface and atmospheric dynamics, Earth system history, climate and climate change, marine and freshwater systems, and ecology. It also considers the interactions between humans and these systems. •Biological sciences Biological sciences encompass all the divisions of natural sciences examining various aspects of vital processes. The concept includes anatomy, physiology, cell biology, biochemistry and biophysics, and covers all organisms from microorganisms, animals to plants. •Health sciences The health sciences study health, disease and healthcare. This field of study aims to develop knowledge, interventions and technology for use in healthcare to improve the treatment of patients.
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