Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 134, Issue -, Pages 123-130Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2016.12.139
Keywords
Lead; Leaded geopolymer; Immobilization mechanism; Chemical property
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Funding
- Beijing Nova program [Z141103001814006]
- National Natural Science Foundation of China [U1360202]
- Fundamental Research Funds for the Central Universities [FRF-TP-14-001C1]
- China Postdoctoral Science Foundation [2014M560885]
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Geopolymer possesses good immobilization capacity for Pb. There are two rival interpretations regarding the immobilization mechanism of Pb. This research investigates the behavior of 3 Pb compounds in geopolymer and clarifies the immobilization mechanism. When Pb contamination is added in the form, soluble in sodium hydroxide solution, the Pb is converted to an amorphous form and participates in the formation of geopolymer network. Successful immobilization of these species relies on chemical bonding and physical encapsulation. On the contrary, the Pb compound inert to sodium hydroxide solution is segregated from the binder and trapped by physical encapsulation. (C) 2016 Elsevier Ltd. All rights reserved.
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