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Pb2+/Cu2+的影响

doi:10.11944/j.issn.1000-0518.2015.08.140436

摘要/Abstract

摘要：

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 NaNO₃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。

关键词: 木质素, 吸附, 离子强度, 外加电解质, 重金属离子

Abstract:

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 Pb²⁺ or Cu²⁺ onto BLPAMA in single or binary metal ion solutions, the adsorption isotherms, kinetics and thermodynamics of Pb²⁺ and Cu²⁺ 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 Pb²⁺ or Cu²⁺ to decrease in the single metal ion solution, the adsorption capacity of Pb²⁺ to decrease while the adsorption capacity of Cu²⁺ to increase in the binary metal ion solution.

Key words: lignin, adsorption, ionic strength, additive electrolyte, heavy metal ions

中图分类号:

姚庆鑫, 谢建军, 刘军霞, 唐丽萍, 刘元. 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Pb²⁺/Cu²⁺的影响[J]. 应用化学, 2015, 32(8): 940-947.

YAO Qingxin, XIE Jianjun, LIU Junxia, TANG Liping, LIU Yuan. Effect of Ionic Strength on the Adsorption of Pb²⁺ and Cu²⁺ onto Bentonite/Sodium Lignosulfonate Graft-Polymerized with Acrylamide and Maleic Anhydride[J]. Chinese Journal of Applied Chemistry, 2015, 32(8): 940-947.

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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Pb²⁺/Cu²⁺的影响

Effect of Ionic Strength on the Adsorption of Pb²⁺ and Cu²⁺ onto Bentonite/Sodium Lignosulfonate Graft-Polymerized with Acrylamide and Maleic Anhydride

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