• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Mn3O4/graphene nanocomposites: outstanding performances as highly efficient photocatalysts and microwave absorbers
【24h】

Mn3O4/graphene nanocomposites: outstanding performances as highly efficient photocatalysts and microwave absorbers

机译：Mn 3 O 4 /石墨烯纳米复合材料：作为高效光催化剂和微波吸收剂的出色性能

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Mn3O4 (M) incorporated graphenes (G) synthesized by a deposition–solvothermal process, formed at various nominal weight percentages (G1M1, G3M1 and G1M3), were efficiently used for the photodegradation of methylene blue dye (MB) under visible light illumination (λ > 420 nm, 88 W, 20 ppm, 298 K) and under microwave irradiation (800 W, 2.45 GHz, 373 K). These materials were characterized using XRD, TEM-SAED, UV-Vis diffuse reflectance, N2 sorptiometry, FTIR and Raman techniques. Amongst the nanocomposites, G3M1 of polyhedral structure and an average domain equal to 10–12 nm has presented unique photo-degradation performance (100% degradation, 60 min, 0.0791 min?1 and TOC of 60%) exceeding the rest of the materials. This was mainly due to the extraordinary optical properties and to the strong interaction between Mn3O4 and graphene through which charge recombination is hampered. Based on the conduction and valence band edges together with the studied reactive species, it has been shown that ˙OH was the dominant species responsible for the MB degradation. Interestingly, the G3M1 nanocomposite has shown fascinating microwave absorption properties and is capable of degrading MB at a faster rate (0.287 min?1) than the one conducted via photocatalysis. Scavenger studies have shown that ˙OH and electrons were responsible for the excellent performance of the MB microwave degradation. The microwave results were discussed in view of the marked increase in dielectric constant (ε?) and dielectric loss (ε′′) in the studied frequency range of 1.0 Hz to 100 kHz, in addition to the electronic conductivity measurements. This work offers an exceptional approach for exploring high-performance microwave absorption as well as distinctive visible light photocatalytic reaction for organics degradation.
机译：Mn 3 O 4 （M）掺入的石墨烯（G），通过沉积-溶剂热法合成，形成于各种标称重量百分比（G1M1，G3M1和G1M3）有效地用于可见光（λ 2 滴定法，FTIR和拉曼技术对这些材料进行了表征。在纳米复合材料中，多面体结构的G3M1和平均域等于10–12 nm表现出独特的光降解性能（100％降解，60分钟，0.0791分钟 ？1 和TOC为60％）超过了其余材料。这主要归因于Mn 3 O 4 与石墨烯之间非凡的光学性能和强相互作用。阻碍了电荷重组。基于导带和价带边缘以及所研究的反应性物种，已证明˙OH是导致MB降解的主要物种。有趣的是，G3M1纳米复合材料具有令人着迷的微波吸收特性，并且能够比通过通过进行的降解更快的速率（0.287 min ？1 ）降解MB。 / em>光催化。清除剂研究表明，˙OH和电子是MB微波降解优异性能的原因。鉴于介电常数（ε ？ ）和介电损耗（ε >''）在1.0 Hz至100 kHz的研究频率范围内，此外还进行了电子电导率测量。这项工作为探索高性能微波吸收以及用于有机物降解的独特可见光光催化反应提供了一种出色的方法。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号