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Essential explanation of the strong mineralization performance of boron-doped diamond electrodes.
Environ Sci Technol. 2008 Jul 01; 42(13):4914-20.ES

Abstract

Electrochemical oxidation of p-nitrophenol was examined using differentanodic materials, including T/boron-doped diamond (BDD), Ti/SnO2-Sb/PbO2, and Ti/SnO2-Sb anodes. The results demonstrated that Ti/BDD anodes had a much stronger mineralization performance than the other two anodes. Furthermore, it was found that hydroxyl radicals could mainly exist as free hydroxyl radicals at BDD anodes, which could react with organic compounds effectively. This implied that the dominant mechanism for a much higher mineralization capacity of BDD anodes would be attributed to the existence of free hydroxyl radicals in the BDD anode cell rather than adsorbed hydroxyl radicals on the BDD anode. To further corroborate this hypothesis, electrochemical oxidation of p-substituted phenols (p-nitrophenol, p-hydroxybenzaldehyde, phenol, p-cresol, and p-methoxyphenol) was examined at the Ti/BDD, Ti/SnO2-Sb/ PbO2, and Ti/SnO2-Sb anodes, respectively. The study revealed that for Ti/BDD electrodes, the degradation rate of p-substituted phenols (k) increased with the increase of Hammett's constant (sigma), which confirmed the dominance of free hydroxyl radicals at BDD anodes and its effective reaction with organics therein. For Ti/SnO2-Sb/PbO2 electrodes, the degradation rate of p-substituted phenols (k) increased with the increase of initial surface concentration gamma (representing the adsorption capacity of phenols to electrode surface), which indicated that organic compounds mainly reacted with adsorbed hydroxyl radicals at PbO2 anodes. For Ti/SnO2-Sb electrodes, however, k increased with the increase of the integrated parameter S (representing the effects of both sigma and gamma), which implied that organic compounds reacted with both adsorbed hydroxyl radicals and free hydroxyl radicals at SnO2 anodes.

Authors+Show Affiliations

Department of Environmental Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

18678026

Citation

Zhu, Xiuping, et al. "Essential Explanation of the Strong Mineralization Performance of Boron-doped Diamond Electrodes." Environmental Science & Technology, vol. 42, no. 13, 2008, pp. 4914-20.
Zhu X, Tong M, Shi S, et al. Essential explanation of the strong mineralization performance of boron-doped diamond electrodes. Environ Sci Technol. 2008;42(13):4914-20.
Zhu, X., Tong, M., Shi, S., Zhao, H., & Ni, J. (2008). Essential explanation of the strong mineralization performance of boron-doped diamond electrodes. Environmental Science & Technology, 42(13), 4914-20.
Zhu X, et al. Essential Explanation of the Strong Mineralization Performance of Boron-doped Diamond Electrodes. Environ Sci Technol. 2008 Jul 1;42(13):4914-20. PubMed PMID: 18678026.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Essential explanation of the strong mineralization performance of boron-doped diamond electrodes. AU - Zhu,Xiuping, AU - Tong,Meiping, AU - Shi,Shaoyuan, AU - Zhao,Huazhang, AU - Ni,Jinren, PY - 2008/8/6/pubmed PY - 2008/10/10/medline PY - 2008/8/6/entrez SP - 4914 EP - 20 JF - Environmental science & technology JO - Environ. Sci. Technol. VL - 42 IS - 13 N2 - Electrochemical oxidation of p-nitrophenol was examined using differentanodic materials, including T/boron-doped diamond (BDD), Ti/SnO2-Sb/PbO2, and Ti/SnO2-Sb anodes. The results demonstrated that Ti/BDD anodes had a much stronger mineralization performance than the other two anodes. Furthermore, it was found that hydroxyl radicals could mainly exist as free hydroxyl radicals at BDD anodes, which could react with organic compounds effectively. This implied that the dominant mechanism for a much higher mineralization capacity of BDD anodes would be attributed to the existence of free hydroxyl radicals in the BDD anode cell rather than adsorbed hydroxyl radicals on the BDD anode. To further corroborate this hypothesis, electrochemical oxidation of p-substituted phenols (p-nitrophenol, p-hydroxybenzaldehyde, phenol, p-cresol, and p-methoxyphenol) was examined at the Ti/BDD, Ti/SnO2-Sb/ PbO2, and Ti/SnO2-Sb anodes, respectively. The study revealed that for Ti/BDD electrodes, the degradation rate of p-substituted phenols (k) increased with the increase of Hammett's constant (sigma), which confirmed the dominance of free hydroxyl radicals at BDD anodes and its effective reaction with organics therein. For Ti/SnO2-Sb/PbO2 electrodes, the degradation rate of p-substituted phenols (k) increased with the increase of initial surface concentration gamma (representing the adsorption capacity of phenols to electrode surface), which indicated that organic compounds mainly reacted with adsorbed hydroxyl radicals at PbO2 anodes. For Ti/SnO2-Sb electrodes, however, k increased with the increase of the integrated parameter S (representing the effects of both sigma and gamma), which implied that organic compounds reacted with both adsorbed hydroxyl radicals and free hydroxyl radicals at SnO2 anodes. SN - 0013-936X UR - https://www.unboundmedicine.com/medline/citation/18678026/Essential_explanation_of_the_strong_mineralization_performance_of_boron_doped_diamond_electrodes_ L2 - https://dx.doi.org/10.1021/es800298p DB - PRIME DP - Unbound Medicine ER -