Journal
APPLIED CATALYSIS A-GENERAL
Volume 583, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcata.2019.117146
Keywords
Chlorinated organics; Persistent organic pollutant; Wastewater; Hydrodechlorination; Electrocatalysis
Categories
Funding
- National Natural Science Foundation of China [51878105]
- Venture & Innovation Support Program for Chongqing Overseas Returnees [cx2017066]
- Program for the Top Young Talents of Chongqing
- Scientific and Technological Research Program of Chongqing Municipal Education Commission [KJQN201800829]
- Chongqing Postdoctoral Science Foundation [Xm2016020]
- Innovative Research Team of Chongqing [CXTDG201602014]
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Chlorinated phenol tends to deprotonate at its hydroxyl group in water, and the ionized CPs dominate the species of reactants in electrocatalytic hydrodechlorination reaction (EHDC). Here we determined the high tendency of the hydroxyl group deprotonation on 2,4-dichlorophenol (2,4-DCP) was highly detrimental to the EHDC reaction on Pd catalysts. This adverse effect arised from the repulsive force generated between the cathode and the ionized 2,4-DCP, which repelled them away from the cathode surface. Notably, the hydroxyl group deprotonation replaced the side hydrogen evolution as primary cause of the poor EHDC performance at low potentials (< -0.85 V). The hydroxyl group deprotonation also favored a cleavage superiority of 4-C-Cl to 2-C-Cl, even though 2-C-Cl was more active. Such a reversal resulted from the direction of the repulsive force to the de-protonated hydroxyl site, making the adjacent 2-C-Cl lie farther from cathode, and become more difficult to react with the atomic hydrogen (H*).
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