Abstract: A new recyclable aminated hyper-cross-linked polystyrene microsphere (A-HPM) is synthesized for effective removal of p-nitrophenol (PNP) from wastewater.Possibly benefited from its unique structure of polystyrene matrix,sufficient aminated groups and high specific surface area,A-HPM can remove PNP from wastewater through the synergetic effect of micropore filling,π-π interactions and acid-base interactions.PNP adsorption by A-HPM is a pH-dependent process with the maximum adsorption capacity of 153.88 mg·g-1 under weak acid condition and an initial PNP concentration of 200 mg·L-1.The adsorption of PNP by A-HPM is an exothermic process,and the removal performance is not affected by the coexisting ions.Kinetic study indicates its adsorption equilibrium can be achieved within 1,200 min.The exhausted A-HPM can be effectively regenerated by sodium hydroxide solution,allowing for long-term cyclic utilization with constant adsorption performance.
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