ORIGINAL RESEARCH
Removing Cr(VI) from Aqueous Solutions via Absorption by Green Synthesized PGA-PL-tannin Gel
Haisong Yin 1, 2  
,  
Guangming Li 1  
,  
Xin Qiao 3  
,  
Tingbin Zhao 4  
,  
Aiyou Sun 5  
,  
Changsheng Qiao 1, 4, 6  
 
 
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1
Tianjin Engineering Research Center of Microbial Metabolism and Fermentation Process Control, College of Biotechnology, Tianjin University of Science and Technology, Tianjin, China
2
School of Bioengineering, Tianjin Modern Vocational Technology College, Tianjin, China
3
School of Biotechnology, Jiangnan University, Wuxi, China
4
Tianjin Huizhi Biotrans Bioengineering Co., Tianjin, China
5
State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
6
Engineering Research Center of Food Biotechnology, Ministry of Education, Tianjin, China
CORRESPONDING AUTHOR
Changsheng Qiao   

Tianjin Engineering Research Center of Microbial Metabolism and Fermentation Process Control, College of Biotechnology, Tianjin University of Science and Technology, China
Online publish date: 2019-11-05
Submission date: 2019-01-16
Final revision date: 2019-04-24
Acceptance date: 2019-04-28
 
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ABSTRACT
Hexavalent chromium Cr(VI) has been proven to be harmful to human health and the environment. Polyglutamic acid (γ-PGA), polylysine (ε-PL), and tannin can be designed to make a gel (PGA-PL-tannin) that can efficiently remove Cr(VI). In this study, the mechanism of Cr(VI) adsorption by PGA-PL-tannin gel was investigated. The results showed that the rate of Cr(VI) removal by this gel exceeded 90% at pH 6-9. A thermodynamic study of the parameters of Cr(VI) adsorption by PGA-PL-tannin gel indicated that the process conformed to the Freundlich isothermal adsorption and pseudo second-order adsorption dynamics models, and was a spontaneous and endothermic process. Owing to the interaction between charged functional groups, Cr(VI) was reduced to trivalent chromium [Cr(III)] after adsorption to the PGA-PL-tannin gel surface. This study demonstrates that PGA-PL-tannin gel could be used as an adsorbent for Cr(VI) pollution control.
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ISSN:1230-1485