通过活化 PMS 增强 RhB 降解的掺杂 C3N5

IF 4.9 2区 化学 Q2 CHEMISTRY, PHYSICAL
Yuxin Chen , Shouchun Ma , Fang Guo , Jie Wu , Liyan Zhao , Xiao Zhang
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引用次数: 0

摘要

去年,先进氧化工艺在废水处理中的应用引起了广泛关注。石墨氮化碳及其衍生物具有优异的光电特性和催化稳定性,具有很高的催化性能。与传统的 g-C3N4 材料相比,g-C3N5 的带隙更窄(g-C3N5 的带隙约为 2.0 eV,g-C3N4 的带隙约为 2.6 eV),且由于其 N 原子比例更高,电子激发分布更好。本研究合成并表征了掺杂 Co 原子的 g-C3N5 复合材料。TEM、XPS 和 XRD 实验结果证明,Co 原子成功掺杂到 g-C3N5 中。Co-C3N5 可活化 PMS,40 分钟内 RhB 降解效率高达 95.8%。实验结果表明,掺杂金属 Co 能有效提高氮化碳材料的催化性能。C3N5、C3N4和Co-C3N4活化RHB的降解效率分别为18.2%、11.2%和41.8%,而Co-C3N5的降解效率高达95.8%。在较宽的 pH 值范围(3.0-10.9)和各种阴离子条件下,RhB 都能被有效降解,这表明 Co-C3N5 具有良好的环境适应性。自由基淬灭实验和 EPR 测试结果表明,活性物种对 RhB 降解的贡献率如下:SO4-- > 1O2 > O2--。本文为使用 Co-C3N5 作为基于 PMS 的芬顿反应催化剂提供了一个新的视角。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Co-doped C3N5 with enhanced RhB degradation by activating PMS

The application of advanced oxidation processes in wastewater treatment has attracted wide attention, in the past year. With excellent photoelectric properties and catalytic stability, graphitic carbon nitride and its derivatives have high catalytic performance. Compared to traditional g-C3N4 materials, g-C3N5 has a narrower band gap (g-C3N5 has a band gap of about 2.0 eV and g-C3N4 has a band gap of about 2.6 eV) and better electron excitation distribution due to it has a higher proportion of N atoms. In this study, the composites of Co atom doped g-C3N5 were synthesized and characterized. Co atoms are successfully doped into g-C3N5, which is proved by TEM, XPS and XRD experimental results. PMS can be activated by Co-C3N5, and RhB degradation efficiency is as high as 95.8 % within 40 min. The experimental results show that the doping of metal Co can effectively improve the catalytic performance of carbon nitride materials. The degradation efficiency of RHB activated by C3N5, C3N4 and Co-C3N4 was 18.2 %, 11.2 % and 41.8 %, respectively, while the degradation efficiency of Co-C3N5 was as high as 95.8 %. RhB was effectively degraded over a wide pH range (3.0–10.9) and under various anion conditions, indicating the excellent environmental suitability of Co-C3N5. The results of free radical quenching experiments and EPR tests showed that the contribution of active species to RhB degradation was as follows: SO4•− > 1O2 > O2•−. This paper provides a new perspective using Co-C3N5 as a catalyst for PMS-based Fenton reaction.

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来源期刊
CiteScore
8.70
自引率
9.60%
发文量
2421
审稿时长
56 days
期刊介绍: Colloids and Surfaces A: Physicochemical and Engineering Aspects is an international journal devoted to the science underlying applications of colloids and interfacial phenomena. The journal aims at publishing high quality research papers featuring new materials or new insights into the role of colloid and interface science in (for example) food, energy, minerals processing, pharmaceuticals or the environment.
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