Synthesis of geopolymer-supported zeolites via robust one-step method and their adsorption potential

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The present study proposes a robust one-step hydrothermal treatment method for synthesis of high strength geopolymer-supported zeolites utilizing industrial by-products (fly ash and blast furnace slag), which can be potentially used as bulk-type solid adsorbents. The results revealed that the geopolymer-supported zeolites, possessing distinct strengths, zeolite phases (Na-P1, Na-chabazite, and analcime) and pore features depending on the mix design and synthesis conditions, can be easily synthesized employing the proposed one-step method. The geopolymer-supported zeolites exhibited the characteristics of mesoporous materials which are typically desired for commercial adsorbents. The maximum adsorption capacity for Pb2+ was found to be about 37.9 mg/g which is relatively higher than the other bulk-type adsorbents reported for Pb2+ to date. Since industrial by-products are used for synthesis of these materials, it will help in reducing the environmental hazards associated with the permanent disposal of such by-products, with an added advantage that these bulk-type solid adsorbents can be easily retrieved after use unlike granular adsorbents.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2018-07
Language
English
Article Type
Article
Keywords

ALKALI-ACTIVATED SLAG; BLAST-FURNACE SLAG; ASH-BASED GEOPOLYMER; COAL FLY-ASH; HEAVY-METAL ADSORPTION; PAPER SLUDGE ASH; MESOPOROUS GEOPOLYMERS; HYDROTHERMAL SYNTHESIS; CEMENTITIOUS MATERIALS; AQUEOUS-SOLUTIONS

Citation

JOURNAL OF HAZARDOUS MATERIALS, v.353, pp.522 - 533

ISSN
0304-3894
DOI
10.1016/j.jhazmat.2018.04.049
URI
http://hdl.handle.net/10203/243686
Appears in Collection
CE-Journal Papers(저널논문)
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