【摘 要】
：
In this work,an adsorbent,which we call MnPT,was prepared by combining MnO2,polyethyleni-mine and tannic acid,and exhibited efficient performance for Cu(Ⅱ)and
【机 构】
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College of Environment and Safety Engineering,State Key Laboratory Base of Eco-Chemical Engineering,
论文部分内容阅读
In this work,an adsorbent,which we call MnPT,was prepared by combining MnO2,polyethyleni-mine and tannic acid,and exhibited efficient performance for Cu(Ⅱ)and Cr(Ⅵ)removal from aqueous solution.The oxygen/nitrogen-containing functional groups on the sur-face of MnPT might increase the enrichment of metal ions by complexation.The maximum adsorption capacities of MnPT for Cu(Ⅱ)and Cr(Ⅵ)were 121.5 and 790.2 mg·g-1,respectively.The surface complexation formation model was used to elucidate the physicochemical interplay in the process of Cu(Ⅱ)and Cr(Ⅵ)co-adsorption on MnPT.Electrostatic force,solvation action,adsorbate-adsorbate lateral interaction,and complexation were involved in the spontaneous adsorption process.Physical electrostatic action was dominant in the initial stage,whereas chemical action was the driving force leading to adsorption equilibrium.It should be noted that after adsorption on the surface of MnPT,Cr(Ⅵ)reacted with some reducing functional groups(hydroxylamine-NH2)and was con-verted into Cr(Ⅲ).The adsorption capacity declined by 12％after recycling five times.Understanding the adsorp-tion mechanism might provide a technical basis for the procedural design of heavy metal adsorbents.This MnPT nanocomposite has been proven to be a low-cost,efficient,and promising adsorbent for removing heavy metal ions from wastewater.
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