【摘 要】
：
The mutual effects of metal cations(Cu2+,Pb2+,Zn2+,and Cd2+)and p-nitropheaol(NP)on their adsorption desorption behavior onto wheat ash were studied.Results sug
【机 构】
：
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Institute of Subtropical
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The mutual effects of metal cations(Cu2+,Pb2+,Zn2+,and Cd2+)and p-nitropheaol(NP)on their adsorption desorption behavior onto wheat ash were studied.Results suggested that Cu2+,Pb2+,and Zn2+diminished the adsorption and increased the desorption of NP remarkably,while Cd2+ had no such effect.In contrast,NP diminished the adsorption of Cu2+,Pb2+,and Zn2+onto ash,however,this suppression effect depended on the initial concentrations of metal cations.NP had no effect on Cd2+adsorption on ash.Fourier transform infrared(FT-IR)and X-ray absorption spectroscopic(XAS)studies suggested the following mechanisms responsible for the metal suppression effect on NP adsorption:(1)large hydrated Cu2+,Pb2+,and Zn2+shells occupied the surface of ash and prevent nonspecific adsorption of NP onto ash surface;(2)Cu2+,Pb2+,and Zn2+may block the micropores of ash,resulting in decreased adsorption of NP;(3)complexation of Cu2+,Pb2+,and Zn2+was likely via carboxyl,hydroxylic and phenolic groups of wheat ash and these same groups may also react with NP during adsorption.As a"soft acid",Cd2+is less efficient in the complexation of oxygencontaining acid groups than Cu2+,Pb2+,and Zn2+.Thus,Cd2+ had no effect on the adsorption of NP on wheat ash.
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