Determination of chemical oxygen demand in mixed organic solution by Ti/TiO2 nanotube array electrode method

Chemical oxygen demand (COD) is a significant parameter for analyzing water quality. However, the detection methods still suffer from the problems of secondary pollution, use of harmful substances, complicated operations, etc. To trace these problems, a Ti/TiO2 nanotube array (NTA) electrode was suc...

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Autores principales:	Xiaojiao Li, Lan Wang, Linshan Wang
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	chemical oxygen demand electrochemical method multi-component solution ti/tio2 electrode Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/488c837768544ea1a3c7d63cc94f9289
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spelling	oai:doaj.org-article:488c837768544ea1a3c7d63cc94f92892021-11-06T11:18:14ZDetermination of chemical oxygen demand in mixed organic solution by Ti/TiO2 nanotube array electrode method0273-12231996-973210.2166/wst.2021.284https://doaj.org/article/488c837768544ea1a3c7d63cc94f92892021-08-01T00:00:00Zhttp://wst.iwaponline.com/content/84/4/865https://doaj.org/toc/0273-1223https://doaj.org/toc/1996-9732Chemical oxygen demand (COD) is a significant parameter for analyzing water quality. However, the detection methods still suffer from the problems of secondary pollution, use of harmful substances, complicated operations, etc. To trace these problems, a Ti/TiO2 nanotube array (NTA) electrode was successfully prepared in this work by the secondary anodic oxidation method. The prepared electrode was used to determine the COD of single- and multi-component solutions (including aniline, rhodamine B, and potassium hydrogen phthalate). The Ti/TiO2 NTA electrode exhibited higher electrochemical oxidation efficiency than the neat Ti one. The electrocatalytic reactions of the target organics on the electrode surface were confirmed to conform to the first-order kinetic process. Within a COD range of 5–150 mg/L, COD value was not only proportional to the anodizing current but also related to organic matter itself. The activation energies of electro-oxidation reaction of different substances differed from each other (An: 14.25 kJ/mol, RhB: 18.56 kJ/mol, and KHP: 35.32 kJ/mol), indicating the differences in their dynamic behaviors on the electrode surface. The related bias obtained for all successive measurements was below ± 5.8%. Therefore, we report a fast, effective, accurate, and well reproducible COD detection method that is feasible for both single-component and multiple-component organic solutions. HIGHLIGHTS A Ti/TiO2 nanotube array electrode was prepared by a secondary anodic oxidation method, a simple and rapid technique.; The Ti/TiO2 electrode exhibited high electrochemical performance. Its electro-oxidation kinetics conformed to first-order kinetics.; For COD determination by the Ti/TiO2 electrode, net current was affected by temperature, and types and ratios of organics, due to functional groups in the organics.;Xiaojiao LiLan WangLinshan WangIWA Publishingarticlechemical oxygen demandelectrochemical methodmulti-component solutionti/tio2 electrodeEnvironmental technology. Sanitary engineeringTD1-1066ENWater Science and Technology, Vol 84, Iss 4, Pp 865-879 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	chemical oxygen demand electrochemical method multi-component solution ti/tio2 electrode Environmental technology. Sanitary engineering TD1-1066
spellingShingle	chemical oxygen demand electrochemical method multi-component solution ti/tio2 electrode Environmental technology. Sanitary engineering TD1-1066 Xiaojiao Li Lan Wang Linshan Wang Determination of chemical oxygen demand in mixed organic solution by Ti/TiO2 nanotube array electrode method
description	Chemical oxygen demand (COD) is a significant parameter for analyzing water quality. However, the detection methods still suffer from the problems of secondary pollution, use of harmful substances, complicated operations, etc. To trace these problems, a Ti/TiO2 nanotube array (NTA) electrode was successfully prepared in this work by the secondary anodic oxidation method. The prepared electrode was used to determine the COD of single- and multi-component solutions (including aniline, rhodamine B, and potassium hydrogen phthalate). The Ti/TiO2 NTA electrode exhibited higher electrochemical oxidation efficiency than the neat Ti one. The electrocatalytic reactions of the target organics on the electrode surface were confirmed to conform to the first-order kinetic process. Within a COD range of 5–150 mg/L, COD value was not only proportional to the anodizing current but also related to organic matter itself. The activation energies of electro-oxidation reaction of different substances differed from each other (An: 14.25 kJ/mol, RhB: 18.56 kJ/mol, and KHP: 35.32 kJ/mol), indicating the differences in their dynamic behaviors on the electrode surface. The related bias obtained for all successive measurements was below ± 5.8%. Therefore, we report a fast, effective, accurate, and well reproducible COD detection method that is feasible for both single-component and multiple-component organic solutions. HIGHLIGHTS A Ti/TiO2 nanotube array electrode was prepared by a secondary anodic oxidation method, a simple and rapid technique.; The Ti/TiO2 electrode exhibited high electrochemical performance. Its electro-oxidation kinetics conformed to first-order kinetics.; For COD determination by the Ti/TiO2 electrode, net current was affected by temperature, and types and ratios of organics, due to functional groups in the organics.;
format	article
author	Xiaojiao Li Lan Wang Linshan Wang
author_facet	Xiaojiao Li Lan Wang Linshan Wang
author_sort	Xiaojiao Li
title	Determination of chemical oxygen demand in mixed organic solution by Ti/TiO2 nanotube array electrode method
title_short	Determination of chemical oxygen demand in mixed organic solution by Ti/TiO2 nanotube array electrode method
title_full	Determination of chemical oxygen demand in mixed organic solution by Ti/TiO2 nanotube array electrode method
title_fullStr	Determination of chemical oxygen demand in mixed organic solution by Ti/TiO2 nanotube array electrode method
title_full_unstemmed	Determination of chemical oxygen demand in mixed organic solution by Ti/TiO2 nanotube array electrode method
title_sort	determination of chemical oxygen demand in mixed organic solution by ti/tio2 nanotube array electrode method
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/488c837768544ea1a3c7d63cc94f9289
work_keys_str_mv	AT xiaojiaoli determinationofchemicaloxygendemandinmixedorganicsolutionbytitio2nanotubearrayelectrodemethod AT lanwang determinationofchemicaloxygendemandinmixedorganicsolutionbytitio2nanotubearrayelectrodemethod AT linshanwang determinationofchemicaloxygendemandinmixedorganicsolutionbytitio2nanotubearrayelectrodemethod
_version_	1718443726968193024

Determination of chemical oxygen demand in mixed organic solution by Ti/TiO2 nanotube array electrode method

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