NiFe Layered Double Hydroxide (LDH) Nanosheet Catalysts with Fe as Electron Transfer Mediator for Enhanced Persulfate Activation.,The Journal of Physical Chemistry Letters

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NiFe Layered Double Hydroxide (LDH) Nanosheet Catalysts with Fe as Electron Transfer Mediator for Enhanced Persulfate Activation.
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2020-01-18 , DOI: 10.1021/acs.jpclett.9b03597
Dongting Yue ₁ , Xuan Yan ₁ , Chao Guo ₁ , Xufang Qian ₁ , Yixin Zhao _{1,

2}

Affiliation

A highly efficient, durable, and cost-effective Fenton-like catalyst is desired to produce the sulfate radicals (•SO4-) for energy and environmental applications. The M(n+1)+/Mn+ redox cycle in metal catalysts requires a high redox potential for •SO4- generation. NiFe layered double hydroxide (LDH) nanosheets with a suitable redox potential for persulfate (PDS) activation were prepared via incorporating Fe into the Ni based LDH. With the help of Fe, the charge-transfer kinetics for the reduction of Ni3+ to Ni2+ was improved and the formation of unwanted Ni component with higher oxidation state was suppressed. The incorporated Fe as the electron transfer mediator enhanced the process of Ni(OH)2/NiOOH redox cycle. Therefore, NiFe LDH exhibited superior performance in PDS activation with exceptionally high activity for the phenolic compounds' degradation in neutral and basic conditions. This work is expected to inspire the rational design of LDHs based catalysts for PDS activation.

中文翻译：

以Fe为电子转移介质的NiFe层状双氢氧化物（LDH）纳米片状催化剂，用于增强过硫酸盐活化。

需要一种高效，耐用且具有成本效益的类Fenton催化剂来生产硫酸根（SO4-），用于能源和环境应用。金属催化剂中的M（n + 1）+ / Mn +氧化还原循环需要生成•SO4-的高氧化还原电势。通过将Fe掺入Ni基LDH中，可以制备具有适合过硫酸盐（PDS）活化作用的氧化还原电势的NiFe层状双氢氧化物（LDH）纳米片。借助Fe，改善了将Ni3 +还原为Ni2 +的电荷转移动力学，并抑制了氧化态较高的有害Ni组分的形成。掺入的Fe作为电子转移介质，增强了Ni（OH）2 / NiOOH的氧化还原循环过程。因此，NiFe LDH在PDS活化中表现出优异的性能，并且对酚类化合物的活性特别高。在中性和碱性条件下的性能下降。预期这项工作将启发基于LDHs的PDS活化催化剂的合理设计。

更新日期：2020-01-23

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