Journal
WATER RESEARCH
Volume 171, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2019.115456
Keywords
Regeneration; Electrochemical; Persulfate; Activated carbon fiber; Advanced oxidation process; Water treatment
Funding
- National Natural Science Foundation of China [51308563]
- China Scholarship Council Fund [201806050078]
- Chongqing natural science foundation project [cstc2019jcyj-msxmx0463]
- Frontier Interdisciplinary Training Project of Fundamental Research Funds for the Central Universities of China [2018CDQYCH0053]
- University of Cincinnati through a UNESCO co-Chair Professor position on Water Access and Sustainability
- Herman Schneider Professorship in the College of Engineering and Applied Sciences
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This study investigated the regeneration of phenol saturated activated carbon fiber (ACF) with a novel electro-peroxydisulfate (E-PDS) process. Compared with traditional electrochemical regeneration, E-PDS process could simultaneously regenerate the exhausted ACF and mineralize desorbed contaminants by activating PDS in water with a much lower energy consumption (1/6). According to the estimation of relative contributions involved in E-PDS process, reactive oxygen species (ROS), especially sulfate radical (SO4 center dot-), played a dominant role in the degradation of phenol and its byproducts. It was worth noting that the accumulation of byproducts in solution increased significantly after SO4 center dot- concentration decreased in aqueous solution. Further study proved that the regeneration efficiency of ACF could be improved by the application of multiple doses of PDS for the effective reduction of byproduct accumulation. However, application of multiple doses of PDS could not prevent ACF from being oxidized by ROS generated in the system, subsequently leading to loss of ACF adsorption capacity. This limitation is a significant concern in treatment technologies based on carbon materials activated by peroxides and such technologies should be studied further to obtain additional insights on their potential and applicability in industrial practice. Nevertheless, the adsorption capacity of ACF remained above 40% after three regeneration cycles in the E-PDS process. Therefore, E-PDS process showed promise for further evaluation as a potentially viable approach for the regeneration of carbons saturated with organic pollutants. (C) 2020 Elsevier Ltd. All rights reserved.
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