AI Article Synopsis
- The electrochemical conversion of highly toxic trivalent arsenic into metallic arsenic can help reduce pollution and promote resource reuse.
- Using sodium citrate as an additive significantly boosts current efficiency for arsenic production from 60% to 91% while reducing harmful byproducts like arsenic hydride.
- The study suggests that sodium citrate enhances the movement and adsorption of arsenic on electrodes, leading to smoother conversion processes and less environmental risk.
Article Abstract
Electrochemical conversion of hypertoxic trivalent arsenic to value-added metallic arsenic can not only contribute to pollution abatement, but also resources reutilization, therefore being widely explored. Electrochemical reduction of trivalent arsenic as a promising way is widely explored. However, the high efficiency conversion is retarded by the sluggish reduction kinetics of AsO and fierce evolution of side products of both H and toxic AsH. Herein, by using the sodium citrate as the additive, the current efficiency for metal arsenic production is increased greatly from 60% to 91%, with the accompanied evolution of hypertoxic AsH being restrained from 0.15 Nm/t to 0.022 Nm/t, promising a high-efficiency and green process. The electrochemical tests and electrode surface characterizations as well as DFT calculations indicate that the added sodium citrate promotes both the diffusion of reactive AsO towards the cathode and its subsequent adsorption on the Ti cathode, contributing to smoother reduction for generating metal arsenic, with the evolution of toxic AsH being hindered at the same time. The results can provide new insights for the high-efficiency and greener conversion of hypertoxic trivalent arsenic to value-added metallic arsenic.
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| http://dx.doi.org/10.1016/j.jes.2024.03.030 | DOI Listing |
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