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EFFICIENT REMOVAL OF PERFLUORINATED COMPOUNDS FROM WATER USING A REGENERABLE MAGNETIC ACTIVATED CARBON
Meng, P., X. Fang, A. Maimaiti, G. Yu, and S. Deng.
Chemosphere 224:187-194(2019)

An ultrafine magnetic activated carbon (MAC) consisting of a 1:3 ratio of Fe3O4 and powdered activated carbon was prepared by ball milling for 2 h to sorb PFASs from water. Increasing the percentage of Fe3O4 and balling milling time decreased the adsorption capacity for PFOS but increased the magnetic separation property. Adsorption equilibriums of 1.63, 0.90, 0.33 and 0.21 mmol/g for PFOS, PFOA, PFHxS and PFBS, respectively, were reached within less than 2 h. Increasing the solution pH decreased PFOS significantly when the pH was less than the zero potential point (around 6) of the MAC. The spent MAC could be easily separated with a magnet and regenerated by a small volume of methanol. Regenerated MAC could be reused more than 5 times and retained stable adsorption capacity for PFOS after 3 cycles.



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