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Received October 27, 2012
Accepted April 6, 2013
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Study on optimal conditions and adsorption kinetics of copper from water by collodion membrane cross-linked poly-γ-glutamic acid
College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, P. R. China 1College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, P. R. China 2Wenzhou Vocational College of Technology and Science, Wenzhou 325035, P. R. China
wuxt222@163.com
Korean Journal of Chemical Engineering, June 2013, 30(6), 1295-1300(6), 10.1007/s11814-013-0051-6
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Abstract
Poly-γ-glutamic acid (γ-PGA) is a novel polyamino acid formed through microorganism fermentation and biosynthesis. In the present test, membrane (PGA-C) formation by γ-PGA and collodion was performed by using 0.1% glutaraldehyde as a cross-linking agent. A study was conducted on the PGA-C adsorption of Cu2+, specifically the related adsorption equilibrium and kinetics, desorption and regeneration. The results show that with an initial solution pH=5.5 and at 318 K, the static adsorption isotherm behavior of PGA-C is in compliance with the Langmuir model and is beneficial to the adsorption of the metal. Meanwhile, with the reaction lasting for 30min, adsorption equilibrium was reached with a maximum adsorption capacity up to 7.431 mg/g. The entire reaction process follows the pseudo-second-order kinetics. By using PGA-C, good regeneration results were obtained after adsorption-generation-adsorption cycling with an HCl solution (0.1 mol/L) as regeneration liquid.
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Inbaraj BS, Chien JT, Ho GH, Yang J, Chen BH, Biochem.Eng., 31, 204 (2006)
Inbaraj BS, Sulochana N, Bioresour. Technol., 94(1), 49 (2004)
Anirudhan TS, Senan P, Unnithan MR, Sep. Purif. Technol., 52(3), 512 (2007)
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