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Thermal defluorination behaviors of PFOS,PFOA and PFBS during regeneration of activated carbon by molten salt

Frontiers of Environmental Science & Engineering 2022年第8期16卷 183-192页

作者： Zhichao Shen Lu Zhan Zhenming Xu School of Environmental Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China School of Ecological and Environmental Sciences East China Normal UniversityShanghai 200241China

Current study proposes a green regeneration method of activated carbon(AC)laden with Perfluorochemicals(PFCs)from the perspective of environmental safety and resource *** defluorination efficiencies of AC adsorbed perfluorooctanesulfonate(PFOS),perfluorooctanoic acid(PFOA)and perfluorobutanesulfonate(PFBS)using three molten sodium salts and one molten alkali were *** showed that defluorination efficiencies of molten NaOH for the three PFCs were higher than the other three molten sodium salts at lower *** 700°C,the defluorination efficiencies of PFOS and PFBS using molten NaOH reached to 84.2%and 79.2%,respectively,while the defluorination efficiency of PFOA was 35.3%.In addition,the temperature of molten salt,the holding time and the ratio of salt to carbon were directly proportional to the defluorination *** low defluorination efficiency of PFOA was due to the low thermal stability of PFOA,which made it difficult to be captured by molten *** weight loss range of PFOA was 75°C–125°C,which was much lower than PFOS and PFBS(400°C–500°C).From the perspective of gas production,fluorine-containing gases produced from molten NaOH-treated AC were significantly reduced,which means that environmental risks were significantly *** molten NaOH treatment,the regenerated AC had higher adsorption capacity than that of pre-treated AC.

关键词： PFCs Molten sodium hydroxide Thermal degradation activated carbon regeneration

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