Electrochemical conversion pathways and existing morphology of arsenic(III) in anode-cathode separated electrolytic cells

To explore the electrochemical conversion of arsenic at different voltages and pH, an open separated electrolytic cell with a platinum anode and a graphite cathode was selected for this paper. The form and concentration of arsenic in the anodic cell and cathodic cell were detected. Experimental resu...

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Autores principales:	Yanyan Qin, Yanping Cui, Zhengwei Zhou, Ya Gao, Lidan Lei, Xiaoyan Shi
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	arsenic conversion pathways existing form graphite cathode separated electrolytic cell Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506
Acceso en línea:	https://doaj.org/article/e86f3195daa24dbeba86b602fc1c1add
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spelling	oai:doaj.org-article:e86f3195daa24dbeba86b602fc1c1add2021-11-06T07:05:15ZElectrochemical conversion pathways and existing morphology of arsenic(III) in anode-cathode separated electrolytic cells1606-97491607-079810.2166/ws.2020.261https://doaj.org/article/e86f3195daa24dbeba86b602fc1c1add2021-02-01T00:00:00Zhttp://ws.iwaponline.com/content/21/1/46https://doaj.org/toc/1606-9749https://doaj.org/toc/1607-0798To explore the electrochemical conversion of arsenic at different voltages and pH, an open separated electrolytic cell with a platinum anode and a graphite cathode was selected for this paper. The form and concentration of arsenic in the anodic cell and cathodic cell were detected. Experimental results proved that at 40.0 V, As(III) in an acid electrolyte in the cathodic cell was firstly mainly reduced to AsH3 with trace As(0) as intermediate. As the electrolysis time arrived at 27 min, pH in the cathodic cell jumped suddenly from acidity to alkalinity, accompanied by the majority of the remaining As(III) converting to As(V) for an instant. As time went on, As(III) and As(V) remained almost unchanged at the ratio of 1:3, and the reduction of As(III) became extremely weak in the alkaline environment. When pH in the cathodic tank was adjusted to keep it acid, As(III) was eventually converted to AsH3. Compared with high voltage, at a low voltage of 1.0 V the cathode failed to achieve the potential of As(III) reduction and As(III) was eventually oxidized to As(V) in the acid catholyte. Electrochemical oxidation of As(III) in the open cathodic cell was likely caused by in-situ generation of peroxide from electrochemical reduction of O2. Theoretical support for electrochemical oxidation of As(III) on a carbon cathode in neutral and weak alkaline media is provided in this study.Yanyan QinYanping CuiZhengwei ZhouYa GaoLidan LeiXiaoyan ShiIWA Publishingarticlearsenicconversion pathwaysexisting formgraphite cathodeseparated electrolytic cellWater supply for domestic and industrial purposesTD201-500River, lake, and water-supply engineering (General)TC401-506ENWater Supply, Vol 21, Iss 1, Pp 46-58 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	arsenic conversion pathways existing form graphite cathode separated electrolytic cell Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506
spellingShingle	arsenic conversion pathways existing form graphite cathode separated electrolytic cell Water supply for domestic and industrial purposes TD201-500 River, lake, and water-supply engineering (General) TC401-506 Yanyan Qin Yanping Cui Zhengwei Zhou Ya Gao Lidan Lei Xiaoyan Shi Electrochemical conversion pathways and existing morphology of arsenic(III) in anode-cathode separated electrolytic cells
description	To explore the electrochemical conversion of arsenic at different voltages and pH, an open separated electrolytic cell with a platinum anode and a graphite cathode was selected for this paper. The form and concentration of arsenic in the anodic cell and cathodic cell were detected. Experimental results proved that at 40.0 V, As(III) in an acid electrolyte in the cathodic cell was firstly mainly reduced to AsH3 with trace As(0) as intermediate. As the electrolysis time arrived at 27 min, pH in the cathodic cell jumped suddenly from acidity to alkalinity, accompanied by the majority of the remaining As(III) converting to As(V) for an instant. As time went on, As(III) and As(V) remained almost unchanged at the ratio of 1:3, and the reduction of As(III) became extremely weak in the alkaline environment. When pH in the cathodic tank was adjusted to keep it acid, As(III) was eventually converted to AsH3. Compared with high voltage, at a low voltage of 1.0 V the cathode failed to achieve the potential of As(III) reduction and As(III) was eventually oxidized to As(V) in the acid catholyte. Electrochemical oxidation of As(III) in the open cathodic cell was likely caused by in-situ generation of peroxide from electrochemical reduction of O2. Theoretical support for electrochemical oxidation of As(III) on a carbon cathode in neutral and weak alkaline media is provided in this study.
format	article
author	Yanyan Qin Yanping Cui Zhengwei Zhou Ya Gao Lidan Lei Xiaoyan Shi
author_facet	Yanyan Qin Yanping Cui Zhengwei Zhou Ya Gao Lidan Lei Xiaoyan Shi
author_sort	Yanyan Qin
title	Electrochemical conversion pathways and existing morphology of arsenic(III) in anode-cathode separated electrolytic cells
title_short	Electrochemical conversion pathways and existing morphology of arsenic(III) in anode-cathode separated electrolytic cells
title_full	Electrochemical conversion pathways and existing morphology of arsenic(III) in anode-cathode separated electrolytic cells
title_fullStr	Electrochemical conversion pathways and existing morphology of arsenic(III) in anode-cathode separated electrolytic cells
title_full_unstemmed	Electrochemical conversion pathways and existing morphology of arsenic(III) in anode-cathode separated electrolytic cells
title_sort	electrochemical conversion pathways and existing morphology of arsenic(iii) in anode-cathode separated electrolytic cells
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/e86f3195daa24dbeba86b602fc1c1add
work_keys_str_mv	AT yanyanqin electrochemicalconversionpathwaysandexistingmorphologyofarseniciiiinanodecathodeseparatedelectrolyticcells AT yanpingcui electrochemicalconversionpathwaysandexistingmorphologyofarseniciiiinanodecathodeseparatedelectrolyticcells AT zhengweizhou electrochemicalconversionpathwaysandexistingmorphologyofarseniciiiinanodecathodeseparatedelectrolyticcells AT yagao electrochemicalconversionpathwaysandexistingmorphologyofarseniciiiinanodecathodeseparatedelectrolyticcells AT lidanlei electrochemicalconversionpathwaysandexistingmorphologyofarseniciiiinanodecathodeseparatedelectrolyticcells AT xiaoyanshi electrochemicalconversionpathwaysandexistingmorphologyofarseniciiiinanodecathodeseparatedelectrolyticcells
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Electrochemical conversion pathways and existing morphology of arsenic(III) in anode-cathode separated electrolytic cells

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