期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 356, 期 -, 页码 17-25出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2018.05.034
关键词
Pd-Ni/MWCNTs/GF; Bimetallic electrode; Electrocatalytic hydrodechlorination; 4-chlorophenol
资金
- National Natural Science Foundation [51778281, 51408297, 51402151, 50938004]
- Jiangsu Natural Science Fund [BK20171342, BK20161493]
- State Key Program of National Natural Science of China, P.R. China [51438008]
- QingLan Project, Jiangsu Province
- Zijin Intelligent Program, Nanjing University of Science and Technology
- Fundamental Research Funds for the Central Universities [30917011309]
- Jiangsu Province University Industry Cooperation Innovation Foundation-Prospective Study of China [BY2016068-07]
- Startup Fund for Talented Scholars of Nanjing Normal University
A novel composite bimetallic electrode, palladium-nickel/multi-walled carbon nanotubes/graphite felt (Pd-Ni/ MWCNTs/GF), was synthesized for the electrocatalytic hydrodechlorination of 4-chlorophenol (4-CP). GF with a three-dimensional structure was used as the electrode substrate, and doped with MWCNTs, which can improve the GF conductivity and serve as a skeleton for metal loading. Ni and Pd were deposited on the electrode surface stepwise to obtain a well-aligned, highly active and stable Pd-Ni/MWCNTs/GF electrode. The Pd-Ni/MWCNTs/ GF cathode showed a high reactivity for the electrocatalytic hydrodechlorination of 4-CP; up to 100% removal of 4-CP was achieved within 30 min, and followed pseudo-first-order kinetics with a rate constant of 0.162 min(-1). Compared with other cathodes, the Pd-Ni/MWCNTs/GF electrode showed superior performance in 4-CP reduction. Excessive current will lower the reaction efficiency and current efficiency because of hydrogen evolution, and acidic solution conditions are more conducive to electrocatalytic reactions. Experiments confirmed that the Ni had a small amount of loss under acidic conditions but remained stable under neutral and alkaline conditions, whereas the loss of Pd for different pH values was constantly low. In cycle tests, the bimetallic electrode exhibits a better reactivity and stability than the single-metal Pd electrode in the long-term.
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