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Enhanced adsorption removal of arsenic from mining wastewater using birnessite under electrochemical redox reactions

Journal Article · · Chemical Engineering Journal
 [1];  [2];  [3];  [2];  [4];  [5]
  1. Huazhong Agricultural Univ., Wuhan, Hubei Province (China); Univ. of New South Wales, Sydney, NSW (Australia); Univ of Connecticut
  2. Huazhong Agricultural Univ., Wuhan, Hubei Province (China)
  3. Univ. of Connecticut, Storrs, CT (United States)
  4. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of High Energy Physics, Beijing Synchrotron Radiation Facility
  5. Chinese Academy of Agricultural Sciences, Beijing (China). Inst. of Environment and Sustainable Development in Agriculture
Manganese oxides have been extensively investigated for arsenic (As) adsorption from aqueous solution. However, the effect of electrochemical redox reactions on the adsorption performance and underlying mechanism remain elusive. Herein, birnessite was used for electrochemical adsorption of As from mining wastewater at a constant cell voltage, and the effect of cell voltage and the continuous use (without desorption) performance of birnessite electrode were also evaluated. We report that at 1.2 V for 24 h, the concentrations of total As (As(T)) and As(III) in wastewater decreased from 3808.7 to 73.7 μg L-1 and 682.8 to 21.4 μg L-1, respectively. The As(T) removal ratio increased with increasing cell voltage and reached 98.1% at 1.2 V, which was higher than that at open circuit (84.1%). The Mn2+ concentration also significantly decreased in wastewater during As adsorption. The high potential of birnessite anode and the generation of H2O2 on cathode facilitated As(III) oxidation, and the electrochemical redox reactions of birnessite contributed to the enhancement of As(T) removal. The application of cell voltage reversal could improve the utilization rate of birnessite electrodes by dissolution-recrystallization during continuous use, and the As(T) removal ratio was increased from 73.5% to 85.1% after five cycles of voltage alteration. The present work indicates that birnessite is a promising absorbent for the electrochemical adsorption of As from real wastewaters.
Research Organization:
Univ. of Connecticut, Storrs, CT (United States)
Sponsoring Organization:
Chinese Scholarship Council; Fundamental Research Funds for the Central Universities; National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division
Grant/Contract Number:
FG02-86ER13622
OSTI ID:
1598202
Journal Information:
Chemical Engineering Journal, Journal Name: Chemical Engineering Journal Journal Issue: C Vol. 375; ISSN 1385-8947
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (1)

Asymmetric Redox‐Polymer Interfaces for Electrochemical Reactive Separations: Synergistic Capture and Conversion of Arsenic journal December 2019

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