Adsorption mechanism of PGA-PL-tannin gel for efficient removal of Cr(Ⅵ)
Sun Yu1,2,3,Li Na1,2,Yu Shiyun3,Zhang Wei3,Hao Limin4,Qiao Changsheng1,2,3
1.College of Biotechnology,Tianjin University of Science & Technology,Tianjin 300222; 2.National and Local United Engineering Lab of Metabolic Control Fermentation Technology, Tianjin 300457; 3.Tianjin Peiyang Biotrans Biotech Co.,Ltd.,Tianjin 300457; 4.The Quartermaster Institute of the General Logistics Department of P.L.A,Beijing 100027
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.
孙雨,李娜,于世云,张卫,郝利民,乔长晟. 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.
Sun Yu,Li Na,Yu Shiyun,Zhang Wei,Hao Limin,Qiao Changsheng. Adsorption mechanism of PGA-PL-tannin gel for efficient removal of Cr(Ⅵ). New Chemical Materials, 2018, 46(10): 173-177.
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