化工新型材料

化工新型材料 ›› 2018, Vol. 46 ›› Issue (10) : 173-177.

科学研究

聚谷氨酸-聚赖氨酸-单宁酸凝胶吸附Cr(Ⅵ)的机理研究

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Adsorption mechanism of PGA-PL-tannin gel for efficient removal of Cr(Ⅵ)

Sun Yu^1,2,3,Li Na^1,2,Yu Shiyun³,Zhang Wei³,Hao Limin⁴,Qiao Changsheng^1,2,3

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摘要

通过批量吸附实验对聚谷氨酸-聚赖氨酸-单宁酸凝胶吸附Cr(Ⅵ)的能力进行研究。结果表明:凝胶吸附Cr(Ⅵ)符合F型等温吸附模型,通过热力学参数研究得出凝胶吸附Cr(Ⅵ)是自发和吸热的过程;动力学研究表明,凝胶吸附Cr(Ⅵ)符合准二动力学模型[k_p2=8.264mg/(g·h)]。通过傅里叶变换红外光谱、固态核磁共振碳谱、电感耦合等离子发射光谱仪、X射线光电子能谱分析仪和差示扫描量热仪等手段分别对凝胶进行结构表征。结果表明凝胶含有的带电官能团之间相互作用使Cr(Ⅵ)转化为Cr(Ⅲ)后,通过静电吸附力吸附到凝胶表面。

Abstract

A new γ-poly glutamic acid (γ-PGA) based functional gel formed by γ-poly glutamic acid,ε-lysine (ε-PL) and tannin was introduced.The efficacy removal of hexavalent chromium (Cr(Ⅵ)) by the gel was aim at.The gel adsorption conformed to Freundlich adsorption isotherm behavior.The results of thermodynamic parameters indicated that the adsorption of Cr(Ⅵ) by gel was a spontaneous and endothermic process.Kinetic study shown that the adsorption of Cr(Ⅵ) by gel obeyed pseudo-second-order kinetic model.The structure characterization of gel was obtained by FT-IR,¹³C-NMR,ICP,XPS and DSC.The results showed complexation reaction of the multiple organic functional groups in the gel with Cr(Ⅵ) and Cr(Ⅵ) transformed into Cr(Ⅲ),the electrostatic adsorption promoted the adsorption of Cr(Ⅲ) into the gel.

关键词

γ-聚谷氨酸 / ε-聚赖氨酸 / 单宁酸 / Cr(Ⅵ) / 吸附机理

Key words

γ-poly glutamic acid / ε-lysine / tannin / Cr (Ⅵ) / adsorption mechanism

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聚谷氨酸-聚赖氨酸-单宁酸凝胶吸附Cr(Ⅵ)的机理研究[J]. 化工新型材料, 2018, 46(10): 173-177 DOI:

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