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Immobilization behavior of Sr in geopolymer and its ceramic product
Author(s) -
Jia Lingyu,
He Peigang,
Jia Dechang,
Fu Shuai,
Wang Meng,
Wang Meiling,
Duan Xiaoming,
Yang Zhihua,
Zhou Yu
Publication year - 2020
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16811
Subject(s) - geopolymer , leaching (pedology) , ceramic , materials science , microstructure , chemical engineering , hazardous waste , metallurgy , mineralogy , composite material , chemistry , waste management , fly ash , environmental science , engineering , soil science , soil water
To date, geopolymer has emerged as a promising and inexpensive precursor with potential application in trapping hazardous elements via physical encapsulation or chemical bonding. In this work, different high‐temperature products derived from Sr‐contained geopolymer precursors were prepared. Different to conventional hazardous elements that immobilized in the geopolymer precursor, which show decreasing leaching rates after high‐temperature treatments, leaching rates of Sr in the resulting high‐temperature products first increase and then decrease with the increasing heating temperature. Herein, we first shed light on the underlying reasons of such temperature‐dependent leaching behaviors by investigating effects of heating temperature on the phase composition, microstructure, and immobilization mechanism. Moreover, a novel immobilization strategy has been proposed based on the blocking effect of formed nepheline structures at 1200°C. Using this strategy, the leaching rate of Sr reduced to 5.82 × 10 −7 g cm −2 d −1 in the deionized water.