Facile fabrication of metakaolin/slag-based zeolite microspheres (M/SZMs) geopolymer for the efficient remediation of Cs and Sr from aqueous media.

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ID: 262317
2020
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Abstract
Herein we report the fabrication of metakaolin/slag-based geopolymer microspheres by dispersion-suspension-solidification technology, and were then transformed into zeolite microspheres by in-situ thermal curing. The rheological properties and mechanical strength of metakaolin/slag-based zeolite microspheres (M/SZMs) were improved by adding slag. The zeolite microspheres were texturally and morphologically characterized by BET, SEM-EDX and XRD techniques. At 20% slag contents of the total mass of M/SZMs, the specific surface area was significantly increased without changing the structure of the zeolite. Rheological properties analysis of slurry revealed pseudoplastic fluid phase and fitted well to Herschel-Bulkley model. The adsorptive removal data of M/SZMs for Cs and Sr from wastewater followed pseudo-second-order kinetics. The maximum adsorption capacity of M/SZMs for Cs and Sr was 103.74 mg/g and 54.90 mg/g and were best explained by Freundlich and Langmuir isotherm models, respectively. M/SZMs exhibited excellent dynamic separation effect in column-based experimental set up. In addition, M/SZMs also realized outstanding adsorptive removal performance for Cs and Sr from different real wastewater samples. Owing to the simplistic fabrication approach, low cost and highly efficacious nature, M/SZMs can be ranked as alternative candidates for the abatement of Cs and Sr from wastewater.
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Authors Lei, Huiye;Muhammad, Yaseen;Wang, Kaituo;Yi, Min;He, Chunlin;Wei, Yuezhou;Fujita, Toyohisa;
Journal Journal of hazardous materials
Year 2020
DOI
S0304-3894(20)32282-2
URL
Keywords
rheological properties co-existing ions column adsorption of cs(+) and sr(2+) dispersion-suspension-solidification textural characterization

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