Electrochemical conversion pathways and existing morphology of arsenic(III) in anode-cathode separated electrolytic cells
| Autor: | Xiaoyan Shi, Yanyan Qin, Lidan Lei, Yanping Cui, Ya Gao, Zhengwei Zhou |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Morphology (linguistics)
Electrolytic cell 0208 environmental biotechnology chemistry.chemical_element 02 engineering and technology 010501 environmental sciences graphite cathode Electrochemistry 01 natural sciences separated electrolytic cell law.invention River lake and water-supply engineering (General) existing form law TD201-500 Arsenic conversion pathways 0105 earth and related environmental sciences Water Science and Technology TC401-506 Water supply for domestic and industrial purposes arsenic Cathode 020801 environmental engineering chemistry Chemical engineering |
| Zdroj: | Water Supply, Vol 21, Iss 1, Pp 46-58 (2021) |
| ISSN: | 1607-0798 1606-9749 |
| DOI: | 10.2166/ws.2020.261 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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