Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 7, Issue 9, Pages 8367-8374Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b00008
Keywords
Acid mine drainage; Air-cathode fuel cell; Electro-Fenton catalyst; Graphite felt; Surface modification
Categories
Funding
- National Natural Science Foundation of China [51478157, 51378166]
- Program for New Century Excellent Talents in University [NCET-13-0767]
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Air-cathode fuel cell (AC-FC) technology provides a facile way for fabricating Fe3O4/graphite composite by in situ utilizing the Fe-II in acid mine drainage (AMD). Herein, surface modification of the graphite support is suggested to be an effective strategy to enhance electro-Fenton (EF) catalytic activity of the Fe3O4/graphite composite prepared from AMD. Four surface modification methods, including H(2)O(2 )treatment, electro-oxidation treatment, KOH treatment, and N2H4 treatment, are applied on commercial graphite felt (GF). Structures and properties of the modified GFs are characterized, and EF catalytic activities of corresponding Fe3O4/GF composites prepared from synthetic AMD are evaluated. The results demonstrate that surface modification of GF not only improves the electro-oxidation of Fe-II in AC-FC but also promotes the electro-generation of H2O2 in the heterogeneous EF process. Notably, the concentration of H2O2 generated on N2H4-treated GF (GF-N2H4) is more than three times that generated on unmodified GF (GF-Raw), and iron content in the prepared Fe3O4/GF-N2H4 composite is more than twice that in the Fe3O4/GF-Raw composite. Application of GF-N2H4 to the treatment of real AMD greatly enhances the recovery efficiency of Fe-II as Fe3O4. The Fe3O4/GF-N2H4 composite prepared from real AMD displays high catalytic activity and good stability in the heterogeneous EF process for mineralizing a variety of refractory organic contaminants.
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