Efficient dechlorination of 2,4-dichlorophenol in an aqueous media with a mild pH using a Pd/TiO2NTs/Ti cathode

Jiangkun DU, Jianguo BAO, Wei HU

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Front. Environ. Sci. Eng. ›› 2015, Vol. 9 ›› Issue (5) : 919-928. DOI: 10.1007/s11783-015-0794-x
RESEARCH ARTICLE

Efficient dechlorination of 2,4-dichlorophenol in an aqueous media with a mild pH using a Pd/TiO2NTs/Ti cathode

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Abstract

In this study, palladium-loaded titania nanotubes was fabricated on a titanium plate (Pd/TiO2NTs/Ti) for efficient electrodechlorination of 2,4-chlorophenol with a mild pH condition. The nature of Pd/TiO2NTs/Ti electrodes was characterized by field-emission scanning electron microscope (FESEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and cyclic voltammetry (CV) techniques. The characterization results indicated the generation of Pd0 nanoparticles which were evenly dispersed on titania nanotubes arrays on the Pd/TiO2NTs/Ti surface. An effective degradation efficiency of up to 91% was achieved within 60 min at cathode potential of −0.7 V (vs. SCE) and initial pH of 5.5. The effects of the applied cathode potential and initial pH on the degradation efficiency were studied. A near neutral condition was more favorable since very low and very high pHs were not conducive to the dechlorination process. Furthermore, the intermediates analysis showed that the Pd/TiO2NTs/Ti electrode could completely remove chlorine from 2, 4-dichlorophenol since only phenol was detected as the byproduct and the concentration of released chlorine ions indicated near-complete dechlorination. This work presents a good alternative technique for eliminating persistent chlorophenols in polluted wastewater without maintaining strong acidic environment.

Keywords

Pd/TiO2NTs/Ti cathode / chlorophenols / electrocatalytic dechlorination / wastewater treatment

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Jiangkun DU, Jianguo BAO, Wei HU. Efficient dechlorination of 2,4-dichlorophenol in an aqueous media with a mild pH using a Pd/TiO2NTs/Ti cathode. Front. Environ. Sci. Eng., 2015, 9(5): 919‒928 https://doi.org/10.1007/s11783-015-0794-x

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