Journal
CARBON
Volume 101, Issue -, Pages 399-408Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2016.02.023
Keywords
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Funding
- National High Technology Research and Development Program of China [2013AA06A305]
- Tsinghua University Initiative Scientific Research Program [20141081174]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT1261]
- Scholarship Award for Excellent Doctoral Student Granted by Yunnan Province
- Collaborative Innovation Center for Regional Environmental Quality
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This study investigated the regeneration of p-nitrophenol (PNP) saturated activated carbon fiber (ACF) by a novel electro-peroxone (E-peroxone) approach, which aimed to simultaneously regenerate exhausted ACF and mineralize desorbed pollutants by coupling conventional cathodic regeneration with ozonation. PNP-saturated ACF was attached to a carbon-polytetrafluorethylene cathode, which was then applied a current to drive cathodic desorption of pre-loaded PNP and electrochemical generation of H2O2 from O-2 in the sparged ozone generator effluent (O-2 and O-3 gas mixture). The electro-generated H2O2 then reacts with sparged O-3 to yield (OH)-O-center dot, which can rapidly mineralize the desorbed pollutants (PNP and its derivatives). After 3 h regeneration, the E-peroxone process restored similar to 95% of the ACF adsorption capacity, and effectively mineralized the desorbed pollutants. In addition, the E-peroxone regeneration did not considerably modify the structural and chemical properties of ACF. Consequently, the ACF exhibited no evident decline in the adsorption capacity after twelve cycles of PNP adsorption and E-peroxone regeneration. These results indicate that the E-peroxone regeneration can successfully achieve the goal of simultaneous regeneration of saturated ACFs and mineralization of desorbed pollutants, and may thus provide an attractive and viable alternative for the regeneration of organic-saturated ACs. (C) 2016 Elsevier Ltd. All rights reserved.
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