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The low-pressure cold microwave (MW) plasma is shown as an efficient method to increase acidity of the ACF within less than 1min treatment without affecting the fibre morphology and strength. The ion-exchange capacity was 1.6 times higher compared to the non-treated ACF sample. Selective removal of the carboxylic groups from the ACF surface by the air–MW-plasma allows to keep the phenolic groups intact...
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