Citation: Zi-Meng Zhang, Rui Cheng, Jun Nan, Xue-Qi Chen, Cong Huang, Di Cao, Cai-Hua Bai, Jing-Long Han, Bin Liang, Zhi-Ling Li, Ai-Jie Wang. Effective electrocatalytic hydrodechlorination of 2, 4, 6-trichlorophenol by a novel Pd/MnO₂/Ni foam cathode[J]. Chinese Chemical Letters, ;2022, 33(8): 3823-3828. doi: 10.1016/j.cclet.2021.11.068 shu

Effective electrocatalytic hydrodechlorination of 2, 4, 6-trichlorophenol by a novel Pd/MnO₂/Ni foam cathode

Zi-Meng Zhang ^a ,
Rui Cheng ^a ,
Jun Nan ^a ,
Xue-Qi Chen ^a ,
Cong Huang ^b ,
Di Cao ^a ,
Cai-Hua Bai ^a ,
Jing-Long Han ^c ,
Bin Liang ^c ,
Zhi-Ling Li ^{a, *,} ,
Ai-Jie Wang ^{a, c}

a.
State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China
b.
National Technology Innovation Center of Synthetic Biology, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin 300308, China
c.
State Key Laboratory of Urban Water Resource and Environment, School of Civil & Environmental Engineering, Harbin Institute of Technology Shenzhen, Shenzhen 518055, China

lzlhit@163.com

Received Date: 16 September 2021
Revised Date: 24 October 2021
Accepted Date: 23 November 2021
Available Online: 27 November 2021

Figures(4)

Pd modified electrodes possess problems such as easy agglomeration and low electrolytic ability, and the use of manganese dioxide (MnO₂) to facilitate Pd reduction of organic pollutants is just started. However, there is still a limited understanding of how to match the Pd load and MnO₂ to realize optimal dechlorination efficiency at minimum cost. Here, a Pd/MnO₂/Ni foam cathode was successfully fabricated and applied for the efficient electrochemical dechlorination of 2, 4, 6-trichlorophenol (2, 4, 6-TCP). The optimal electrocatalytic hydrodechlorination (ECH) performance with 2, 4, 6-TCP dechlorination efficiency (92.58% in 180 min) was obtained when the concentration of PdCl₂ precipitation was 1 mmol/L, the deposition time of MnO₂ was 300 s and cathode potential was −0.8 V. Performance influenced by the exogenous factors (e.g., initial pH and coexisted ions) were further investigated. It was found that the neutral pH was the most favorable for ECH and a reduction in dechlorination efficiency (6%~47.6%) was observed in presence of 5 mmol/L of NO₂⁻, NO₃⁻, S²⁻ or SO₃²⁻. Cyclic voltammetry (CV) and quenching experiments verified the existence of three hydrogen species on Pd surface, including adsorbed atomic hydrogen (H*_ads), absorbed atomic hydrogen (H*_abs), and molecular hydrogen (H₂). And the introduction of MnO₂ promoted the generation of atomic H*. Only adsorbed atomic hydrogen (H*_ads) was confirmed that it truly facilitated the ECH process. Besides H*_ads induced reduction, the direct reduction by cathode electrons also participated in the 2, 4, 6-TCP dechlorination process. Pd/MnO₂/Ni foam cathode shows excellent dechlorination performance, fine stability and recyclable potential, which provides strategies for the effective degradation of persistent halogenated organic pollutants in groundwater.
- Pd/MnO₂/Ni foam cathode,
- 2, 4, 6-Trichlorophenol,
- Electrocatalytic hydrodechlorination,
- Dechlorination pathway,
- Atomic H* generation and utilization
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沈阳化工大学材料科学与工程学院沈阳 110142

Effective electrocatalytic hydrodechlorination of 2, 4, 6-trichlorophenol by a novel Pd/MnO2/Ni foam cathode

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通讯作者: 陈斌, bchen63@163.com

Effective electrocatalytic hydrodechlorination of 2, 4, 6-trichlorophenol by a novel Pd/MnO₂/Ni foam cathode