Electrochemically assisted adsorption and removal of micropollutants in water on activated carbon filter
In this study,10 kinds of commercial activated carbon filters were selected and their relevant physicochemical properties were tested.The filters with high specific surface area and good electrical conductivity were selected for the electrochemically assisted adsorption of three types of typical micropollutants in drinking water of dichloroacetic acid(DCAA),levofloxacin(LVFX)and ciprofloxacin(CIP).The adsorption kinetic curves of 3 types of pollutants under electrochemical assistance were consistent with the pseudo second-order model.The optimal initial adsorption rates v0 for DCAA,LVFX and CIP reached 12.4 mg·g-1·h-1(2.0 V),45.3 mg·g-1·h-1(-2.0 V)and 93.1 mg·g-1·h-1(-2.0 V),respectively,which were 1.2～1.7 times higher than those without electrochemical assistance.The electrochemically assisted adsorption isotherms of three types of pollutants were well fitted by the Langmuir model.The maximum adsorption capacities qm of DCAA,LVFX and CIP under electrochemical assistance could reach 26.3 mg·g-1(2.0 V),207.9 mg·g-1(-2.0 V),and 106.1 mg·g-1(-2.0 V),respectively,which were enhanced by 1.2～3.2 times compared with those without electrochemical assistance.In the flow-mode of adsorption experiment,the DCAA concentration of the effluent under electrochemical assistance was lower than that without electricity,presenting a better effluent quality.The treated water quantity under electrically enhanced adsorption reached 1 300 bed volumes,which was a 2.2-fold improvement over that without electrochemical assistance.The study demonstrates that the electrochemically assisted adsorption of activated carbon filter is promising in the advanced treatment of drinking water.
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