ORIGINAL RESEARCH
Removing Cr(VI) from Aqueous Solutions
via Absorption by Green Synthesized
PGA-PL-tannin Gel
| 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
Tianjin Engineering Research Center of Microbial Metabolism and Fermentation Process Control, College of Biotechnology, Tianjin University of Science and Technology, China
Online publication date: 2019-11-05
Submission date: 2019-01-16
Final revision date: 2019-04-24
Acceptance date: 2019-04-28
KEYWORDS
TOPICS
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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