期刊
ELECTROCHIMICA ACTA
卷 232, 期 -, 页码 13-21出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2017.02.071
关键词
Electrocatalytic dechlorination; TCAA removal; Pd-In/gamma-Al2O3
资金
- National Natural Science Foundation of China [51478455, 51438011]
- National Science Fund for Distinguished Young Scholars of China [51225805]
Electrochemical reduction treatment was found to be a promising method for dechlorination of Trichloroacetic acid (TCAA), and acceleration of electron transfer or enhancement of the concentration of atomic H* significantly improve the electrochemical dechlorination process. Bimetallic Pd-based catalysts have the unique property of simultaneously catalyzing the production of atomic H* and reducing target pollutants. Herein, a bimetallic Pd-In electrocatalyst with atomic ratio of 1: 1 was evenly deposited on an Al2O3 substrate, and the bimetallic Pd-In structure was confirmed via X-ray photoelectron spectroscopy (XPS). Electrochemical removal of trichloroacetic acid (TCAA) by the PdIn/Al2O3 catalyst was performed in a three-dimensional reactor. 94% of TCAA with the initial concentration of 500 mu g L-1 could be degraded within 30 min under a relatively low current density (0.9 mA cm (2)). In contrast to the presence of refractory intermediates (dichloroacetic acid (DCAA)) found in the Pd/Al2O3 system, TCAA could be thoroughly reduced to monochloroacetic acid (MCAA) using Pd-In/Al2O3 catalysts. According to scavenger experiments, an electron transfer process and atomic H* formation function both existed in the TCAA reduction process, and the enhanced indirect atomic H* reduction process (confirmed by ESR signals) played a chief role in the TCAA removal. Moreover, the synergistic effects of Pd and In were proven to be able to enhance both direct electron transfer and indirect atomic H* formation, indicating a promising prospect for bimetallic electrochemical reduction treatment. (C) 2017 Elsevier Ltd. All rights reserved.
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