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首页> 外文期刊>RSC Advances >Hydrogenation/oxidation induced efficient reversible color switching between methylene blue and leuco-methylene blue
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Hydrogenation/oxidation induced efficient reversible color switching between methylene blue and leuco-methylene blue

机译：氢化/氧化诱导亚甲基蓝和无色亚甲基蓝之间的有效可逆颜色转换

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摘要

In this paper, we present the use of graphitic carbon nitride (g-C3N4) supported palladium nanoparticles (Pd/g-C3N4) for reversible color switching of methylene blue (MB). g-C3N4 with a high polymeric degree could improve the dispersity of Pd nanoparticles, contributing to fast color switching of MB as the agglomeration of metal nanoparticles is significantly prevented. Moreover, strong metal-support interaction (SMSI) between Pd nanoparticles and g-C3N4 support promotes the adsorption and subsequent dissociation of molecular hydrogen and oxygen, thus leading to efficient reversible conversion between MB and leuco-methylene blue (LMB). Our obtained Pd/g-C3N4 nanocatalyst exhibits outstanding hydrogenation activity of blue MB to colorless LMB with a turnover frequency as high as 165 h?1 at room temperature, moreover, colorless LMB can quickly switch back to MB upon exposing the same reaction system to oxygen for oxidation. It is noted that our color switching system exhibits remarkable reversibility and stability without obvious fatigue even after 10 consecutive cycles. This novel redox-driven reversible color switching system could find potential in food packaging, sensing and organic transformations.
机译：在本文中，我们介绍了使用石墨碳氮化物（gC 3 N 4 ）负载的钯纳米颗粒（ Pd / gC 3 N 4 ）用于亚甲基蓝（MB）的可逆颜色切换。聚合度高的gC 3 N 4 可以改善Pd纳米颗粒的分散性，有助于快速进行颜色切换由于显着地防止了金属纳米颗粒的团聚，因此无法进行MB迁移。此外，Pd纳米颗粒与gC 3 N 4 载体之间的强金属-载体相互作用（SMSI）促进了吸附以及随后分子氢和氧的解离，从而导致MB和无色亚甲基蓝（LMB）之间有效的可逆转化。我们获得的Pd / gC 3 N 4 纳米催化剂具有出色的蓝色MB到无色LMB的氢化活性室温下高达165 h ？1 的频率，无色LMB在将相同的反应体系暴露于氧气进行氧化后可以迅速切换回MB。值得注意的是，即使在连续10个循环之后，我们的颜色切换系统仍具有出色的可逆性和稳定性，而没有明显的疲劳感。这种新颖的氧化还原驱动的可逆颜色切换系统可以在食品包装，感测和有机转化中发现潜力。

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