Journal
MATERIALS LETTERS
Volume 239, Issue -, Pages 192-195Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2018.12.105
Keywords
Amorphous materials; Composite materials; Geopolymer; Pb removal; Crystallization
Funding
- National Natural Science Foundation of China [51502272]
- Natural Science Foundation of Zhejiang Province [LY19E080003]
- Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) [G1323511668]
- Opening Project of Engineering Research Center of Nano-Geo Materials of Ministry of Education, China University of Geosciences [NGM2018KF011]
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In this work, novel geopolymer-alginate-chitosan composites were synthesized from metakaolin geopolymer and mixtures of sodium alginate solution and chitosan for direct removal of Pb from wastewater. The results show that the equilibrium adsorption capacity of the composites for Pb removal was as high as 120.45-142.67 mg/g at pH 5 and 25 degrees C, and the adsorption kinetics can be described by pseudo-second-order kinetic model and Freundlich isotherm model. The composites preserved a crystal structure of hydrocerussite (Pb-rich phase) after adsorption. Pb2+ was attracted intensely by the functionalities from alginate-chitosan and then immobilized crystallization between OH center dot from geopolymer and dissolved CO2 from the air. (C) 2018 Elsevier B.V. All rights reserved.
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