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Immobilization mechanism of Se oxyanions in geopolymer: Effects of alkaline activators and calcined hydrotalcite additive. | LitMetric

Immobilization mechanism of Se oxyanions in geopolymer: Effects of alkaline activators and calcined hydrotalcite additive.

J Hazard Mater

Department of Earth Resources Engineering, Kyushu University, Fukuoka, 819-0395, Japan. Electronic address:

Published: April 2020

Geopolymers have been widely adopted to stabilize the cationic pollutants. However, few studies have focused on the immobilization of anionic species. In this study, the immobilization of SeO and SeO was explored for the first time using geopolymer activated by different alkaline solutions (NaOH and NaSiO) with and without calcined hydrotalcite (CHT), characterized by TCLP, XRD, FTIR, TG, NMR, XAFS, and N adsorption-desorption isotherm. NaSiO-activated geopolymers without CHT additive showed lower leaching percentages of SeO and SeO (approximately 10 % and 18 %) than NaOH-activated geopolymers (approximately 58 % and 74 %). It has been proven that electrostatic interaction is the main association mode of SeO and SeO in both NaOH- and NaSiO-activated geopolymers. Hence, compactness plays a vital role in the Se leaching from geopolymer. The addition of CHT reduced the compactnesses of both NaOH- and NaSiO-geopolymers. Due to the formation of hydrotalcite, the CHT additive contributed to immobilize SeO and SeO in NaOH-activated geopolymers. However, this phenomenon was not observed in NaSiO-activated geopolymers. Thus, the leaching amount of Se greatly increased from NaSiO-activated geopolymers with CHT additive. This study provides new insights on the application of geopolymer to immobilize anionic pollutants.

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http://dx.doi.org/10.1016/j.jhazmat.2019.121994DOI Listing

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