NiFe Layered Double Hydroxide (LDH) Nanosheet Catalysts with Fe as Electron Transfer Mediator for Enhanced Persulfate Activation

Dongting Yue; Xuan Yan; Chao Guo; Xufang Qian; Yixin Zhao

doi:10.1021/acs.jpclett.9b03597

NiFe Layered Double Hydroxide (LDH) Nanosheet Catalysts with Fe as Electron Transfer Mediator for Enhanced Persulfate Activation

J Phys Chem Lett. 2020 Feb 6;11(3):968-973. doi: 10.1021/acs.jpclett.9b03597. Epub 2020 Jan 22.

Authors

Dongting Yue¹, Xuan Yan¹, Chao Guo¹, Xufang Qian¹, Yixin Zhao^{1

2}

Affiliations

¹ School of Environmental Science and Engineering , Shanghai Jiao Tong University , 800 Dongchuan Road , Shanghai 200240 , China.
² Shanghai Institute of Pollution Control and Ecological Security , Shanghai 200092 , China.

PMID: 31957448
DOI: 10.1021/acs.jpclett.9b03597

Abstract

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.