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author:

Zhong, S. (Zhong, S..) [1] | Xu, T. (Xu, T..) [2] | Chen, H. (Chen, H..) [3] | Tang, D. (Tang, D..) [4] | Tan, W. (Tan, W..) [5] | Weng, W. (Weng, W..) [6] | Shi, Y. (Shi, Y..) [7]

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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 AsO33− and fierce evolution of side products of both H2 and toxic AsH3. 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 AsH3 being restrained from 0.15 Nm3/tAs to 0.022 Nm3/tAs, 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 AsO33− towards the cathode and its subsequent adsorption on the Ti cathode, contributing to smoother reduction for generating metal arsenic, with the evolution of toxic AsH3 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. © 2024

Keyword:

Electrochemical conversion Metallic arsenic Sodium citrate Toxic arsenic

Community:

  • [ 1 ] [Zhong S.]Zijin School of Geology and Mining, Fuzhou University, Fuzhou, 350108, China
  • [ 2 ] [Zhong S.]Fujian Key Laboratory of Green Extraction and High-value Utilization of New Energy Metals, Fuzhou University, Fuzhou, 350108, China
  • [ 3 ] [Zhong S.]Zijin Mining Group Co., Ltd, Longyan, Shanghang, 364200, China
  • [ 4 ] [Xu T.]Zijin School of Geology and Mining, Fuzhou University, Fuzhou, 350108, China
  • [ 5 ] [Chen H.]Zijin Mining Group Co., Ltd, Longyan, Shanghang, 364200, China
  • [ 6 ] [Tang D.]Zijin Mining Group Co., Ltd, Longyan, Shanghang, 364200, China
  • [ 7 ] [Tan W.]Zijin School of Geology and Mining, Fuzhou University, Fuzhou, 350108, China
  • [ 8 ] [Tan W.]Fujian Key Laboratory of Green Extraction and High-value Utilization of New Energy Metals, Fuzhou University, Fuzhou, 350108, China
  • [ 9 ] [Weng W.]Zijin School of Geology and Mining, Fuzhou University, Fuzhou, 350108, China
  • [ 10 ] [Weng W.]Fujian Key Laboratory of Green Extraction and High-value Utilization of New Energy Metals, Fuzhou University, Fuzhou, 350108, China
  • [ 11 ] [Shi Y.]Inner Mongolia Academy of Science and Technology, Hohhot, 010010, China

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Source :

Journal of Environmental Sciences (China)

ISSN: 1001-0742

CN: 11-2629/X

Year: 2025

Volume: 151

Page: 79-87

5 . 9 0 0

JCR@2023

Cited Count:

WoS CC Cited Count:

SCOPUS Cited Count: 1

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 1

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