Polymeric quaternary ammonium salt was immobilized on activated carbon(AC)

by oxidation of AC with concentrated nitric acid

subsequent eletrostatic assembly to produce a high-performance bactericide(P-AC)with good adsorption.The surface characteristics of AC before and after modification were analyzed by Boehm method.The composition and microstructure of P-AC were characterized by FTIR and TG.The adsorption capacity of the obtained P-AC was tested using phenol as a model compound

and the antibacterial activity against E.coli was also measured.The results show that:(1)AC is well modified by concentrated nitric acid

carboxyl and lactone groups of AC increase while the hydroxyl groups decrease;(2)Polymeric quaternary ammonium salt was immobilized on modified AC with loading of 12%(mass)

P-AC has lower BET surface area and the pore volume than AC

but has the larger average pore diameter;(3)P-AC exhibits good adsorption property for phenol

which is 82.5% of adsorption capacity of AC;(4)P-AC shows excellent antibacterial property

an antibacterial efficiency for E.coli of 99% can be achieved over a period of 2 hours.And a slight decrease of 5% in antibacterial efficiency can be observed after 10 batches of regeneration-antibacterial action cycle tests.