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篇目详细内容

【篇名】 Efficient dechlorination of 2,4-dichlorophenol in an aqueous media with a mild pH using a Pd/TiO2NTs/Ti cathode
【刊名】 Frontiers of Environmental Science & Engineering
【刊名缩写】 Front. Environ. Sci. Eng.
【ISSN】 2095-2201
【EISSN】
【DOI】 10.1007/s11783-015-0794-x
【出版社】
【出版年】 2015
【卷期】 9 卷5期
【页码】 919-928 页,共 10 页
【作者】 Jiangkun DU; Jianguo BAO; Wei HU;
【关键词】 Pd/TiO2NTs/Ti cathode|chlorophenols|electrocatalytic dechlorination|wastewater treatment

【摘要】

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.

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