Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 49, Issue 17, Pages 10562-10569Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.5b02092
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Funding
- Fund for Innovative Research Group of the National Natural Science Foundation of China [51421065]
- National Natural Science Foundation of China [51378065]
- Fundamental Research Funds for the Central Universities of China [2012LZD03]
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Removal of environmentally persistent perfluoroalkyl acids (PFAAs), that is, perfluorooctanesulfonate (PFOS) and perfluorocarboxylic acids (PFCAs, C-4 similar to C-10) were investigated through sorption on four metal hydroxide flocs generated in situ by electrocoagulation in deionized water with 10 mM NaCl as supporting electrolyte. The results indicated that the zinc hydroxide flocs yielded the highest removal efficiency with a wide range concentration of PFOA/PFOS (1.5 mu M similar to 0.5 mM) at the zinc dosage <150 mg L-1 with the energy consumption <0.18 Wh L-1. The sorption kinetics indicated that the zinc hydroxide flocs had an equilibrium adsorbed amount (q(e)) up to 5.74/7.69 mmol g(-1) (Zn) for PFOA/PFOS at the initial concentration of 0.5 mM with an initial sorption rate (nu(0)) of 1.01 x 10(3)/1.81 x 10(3) mmol g(-1) h(-1). The sorption of PFOA/PFOS reached equilibrium within <10 min. The sorption mechanisms of PFAAs on the zinc hydroxide flocs were proposed based on the investigation of various driving forces. The results indicated that the hydrophobic interaction was primarily responsible for the PFAAs sorption. The electrocoagulation process with zinc anode may have a great potential for removing PFAAs from industrial wastewater as well as contaminated environmental waterbody.
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