Oxidation of Trivalent Arsenic to Pentavalent Arsenic by Means of a BDD Electrode and Subsequent Precipitation as Scorodite

被引:1
作者
Bachmann, Anna-Lisa [1 ]
Homm, Gert [1 ]
Weidenkaff, Anke [1 ]
机构
[1] Fraunhofer Res Inst Mat Recycling & Resource Strat, D-63755 Alzenau, Germany
关键词
BDD electrode; boron-doped diamond; electrochemical oxidation; arsenic; scorodite; copper;
D O I
10.3390/su15119030
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
In order to deposit arsenic residues from copper production in a stable way, the trivalent arsenic must first be xidized to arsenic(V). A well-known but quite expensive method for this is oxidation with hydrogen peroxide. In order to enable the oxidation of arsenic on a large scale in the future, a potentially cheaper method has to be found, which offers the possibility of oxidizing extremely high arsenic concentrations. As a novel alternative, electrochemical oxidation using a boron-doped diamond electrode is investigated. Based on previous work, this paper concentrates on the presence of interfering ions during oxidation. Furthermore, it is shown that the electrochemically xidized arsenic(V) can be precipitated as scorodite. Finally, an economic analysis shows the potential financial benefit of oxidation via BDD electrodes compared to hydrogen peroxide.
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页数:13
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