Essential explanation of the strong mineralization performance of boron-doped diamond electrodes

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	Essential explanation of the strong mineralization performance of boron-doped diamond electrodes
	Zhu, Xiuping 1; Tong, Meiping 1; Shi, Shaoyuan 2; Zhao, Huazhang 1; Ni, Jinren 1
刊名	ENVIRONMENTAL SCIENCE & TECHNOLOGY
	2008-07-01
卷号	42 期号:13 页码:4914-4920
关键词	waste-water treatment p-substituted phenols electrochemical oxidation organic pollutants anodic-oxidation aqueous-solution degradation 4-chlorophenol incineration 2-naphthol
ISSN号	0013-936X
其他题名	Environ. Sci. Technol.
中文摘要	Electrochemical oxidation of p-nitrophenol was examined using different anodic materials, including Ti/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.
英文摘要	Electrochemical oxidation of p-nitrophenol was examined using different anodic materials, including Ti/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.
WOS标题词	Science & Technology ; Technology ; Life Sciences & Biomedicine
类目[WOS]	Engineering, Environmental ; Environmental Sciences
研究领域[WOS]	Engineering ; Environmental Sciences & Ecology
关键词[WOS]	WASTE-WATER TREATMENT ; P-SUBSTITUTED PHENOLS ; ELECTROCHEMICAL OXIDATION ; ORGANIC POLLUTANTS ; ANODIC-OXIDATION ; AQUEOUS-SOLUTION ; DEGRADATION ; 4-CHLOROPHENOL ; INCINERATION ; 2-NAPHTHOL
收录类别	SCI
原文出处	://WOS:000257220600052
语种	英语
WOS记录号	WOS:000257220600052
公开日期	2013-10-08
内容类型	期刊论文
版本	出版稿
源URL	[http://ir.ipe.ac.cn/handle/122111/2937]
专题	过程工程研究所_研究所（批量导入）
作者单位	1.Peking Univ, Dept Environm Engn, Key Lab Water & Sediment Sci, Minist Educ, Beijing 100871, Peoples R China 2.Chinese Acad Sci, Inst Proc Engn, Natl Key Lab Biochem Engn, Beijing 100080, Peoples R China
推荐引用方式 GB/T 7714	Zhu, Xiuping,Tong, Meiping,Shi, Shaoyuan,et al. Essential explanation of the strong mineralization performance of boron-doped diamond electrodes[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2008,42(13):4914-4920.
APA	Zhu, Xiuping,Tong, Meiping,Shi, Shaoyuan,Zhao, Huazhang,&Ni, Jinren.(2008).Essential explanation of the strong mineralization performance of boron-doped diamond electrodes.ENVIRONMENTAL SCIENCE & TECHNOLOGY,42(13),4914-4920.
MLA	Zhu, Xiuping,et al."Essential explanation of the strong mineralization performance of boron-doped diamond electrodes".ENVIRONMENTAL SCIENCE & TECHNOLOGY 42.13(2008):4914-4920.