TY - JOUR
T1 - Sulfate removal from acid mine drainage using polypyrrole-grafted granular activated carbon
AU - Hong, Siqi
AU - Cannon, Fred S.
AU - Hou, Pin
AU - Byrne, Timothy
AU - Nieto-Delgado, Cesar
N1 - Funding Information:
The authors gratefully thank the Ben Franklin Technology Program ( 11C.5516U-1 ) and the Chinese Scholarship Council for financial support for this research. The authors also acknowledge the work of Isabel Zermeno-Montante for conducting the water quality analysis.
PY - 2014/7
Y1 - 2014/7
N2 - A novel method of removing sulfate from acid mine drainage (AMD) water was developed by depositing polypyrrole into the pores of wood-based activated carbon (RGC) using in situ chemical oxidative polarization. This polypyrrole-tailored activated carbon hosted positively charged polypyrrole functionality that offered sorption capacity for sulfate. Specifically, in batch tests, the polypyrrole-grafted RGC achieved a sulfate loading of 48 mg/g, this being 8 times higher than for pristine RGC. Rapid Small Scale Column Tests appraised the polypyrrole-tailored RGC for removing 773 mg/L sulfate from AMD water. The more favorably tailored carbon removed sulfate to half-breakthrough at 24 bed volumes (BV). This compared to 1.5 BV for pristine activated carbon. Per mass and charge balance, 9% of the nitrogen in the polypyrrole functionality was active for capturing sulfate. On this tailored carbon, the nitrogen content was 12.9%, as characterized by X-ray photoelectron spectroscopy. With this polypyrrole tailoring, the carbon's pore volume distributions diminished to one-third, as characterized by argon adsorption.
AB - A novel method of removing sulfate from acid mine drainage (AMD) water was developed by depositing polypyrrole into the pores of wood-based activated carbon (RGC) using in situ chemical oxidative polarization. This polypyrrole-tailored activated carbon hosted positively charged polypyrrole functionality that offered sorption capacity for sulfate. Specifically, in batch tests, the polypyrrole-grafted RGC achieved a sulfate loading of 48 mg/g, this being 8 times higher than for pristine RGC. Rapid Small Scale Column Tests appraised the polypyrrole-tailored RGC for removing 773 mg/L sulfate from AMD water. The more favorably tailored carbon removed sulfate to half-breakthrough at 24 bed volumes (BV). This compared to 1.5 BV for pristine activated carbon. Per mass and charge balance, 9% of the nitrogen in the polypyrrole functionality was active for capturing sulfate. On this tailored carbon, the nitrogen content was 12.9%, as characterized by X-ray photoelectron spectroscopy. With this polypyrrole tailoring, the carbon's pore volume distributions diminished to one-third, as characterized by argon adsorption.
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U2 - 10.1016/j.carbon.2014.02.036
DO - 10.1016/j.carbon.2014.02.036
M3 - Article
AN - SCOPUS:84897435143
SN - 0008-6223
VL - 73
SP - 51
EP - 60
JO - Carbon
JF - Carbon
ER -