离子强度对膨润土/木质素磺酸钠接枝丙烯酰胺-马来酸酐复合吸附树脂吸附Pb^(2+)/Cu^(2+)的影响

Effect of Ionic Strength on the Adsorption of Pb^(2+) and Cu^(2+) onto Bentonite / Sodium Lignosulfonate Graft-Polymerized with Acrylamide and Maleic Anhydride

为揭示外加电解质离子强度对重金属离子吸附的影响规律与内在机制,制备了膨润土/木质素磺酸钠接枝丙烯酰胺-马来酸酐复合吸附树脂(BLPAMA),研究了外加电解质离子强度对BLPAMA吸附单一和二元Pb2+/Cu2+的影响规律,以及有、无外加0.2 mol/L Na NO3时BLPAMA对二元Pb2+/Cu2+的吸附等温线、吸附热力学及吸附动力学。结果表明,在单一Pb2+或Cu2+溶液中,随离子强度增加,Pb2+和Cu2+吸附量降低;在二元Pb2+/Cu2+溶液中,随离子强度增加,Pb2+吸附量降低而Cu2+吸附量提高。

Adsorbent composites comprising of bentonite/sodium lignosulfonate graft-polymerized with acrylamide and maleic anhydride （BLPAMA） were prepared and used to investigate the effect of ionic strength on the adsorption of Pb^2＋ or Cu^2＋ onto BLPAMA in single or binary metal ion solutions, the adsorption isotherms, kinetics and thermodynamics of Pb^2＋ and Cu^2＋ onto BLPAMA with or without addition of 0. 2 mol/L NANO3 in the binary metal ion solutions. The results show that the increase of ionic strength leads the adsorption capacity of Pb^2＋ or Cu^2＋ to decrease in the single metal ion solution, the adsorption capacity of Pb^2＋ to decrease while the adsorption capacity of Cu^2＋ to increase in the binary metal ion solution.