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Crystals
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Geopolymer-Derived Zeolite or Ceramics
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Geopolymer-Derived Zeolite or Ceramics

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Polycrystalline Ceramics".

Deadline for manuscript submissions: closed (20 December 2021) | Viewed by 7959

Special Issue Editor

Dr. Chengying Bai

E-Mail Website
Guest Editor
College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
Interests: porous geopolymer; porous ceramics; geopolymer-matrix composites; geopolymer
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Geopolymers (inorganic polymers) have emerged as one of the most promising inorganic non-metal materials over the past few years due to their remarkable advantages, such as low cost and low CO2 emission, facile synthesis protocol, good formability and local availability, superior thermal and chemical resistance, lightweight porous structure, rapid hardening with an excellent resultant strength, and so on. They are considered a new precursor to zeolite and ceramics. The zeolite can be introduced to geopolymer-matrix by directly adding or by hydrothermal treatment of pure geopolymer or synchronous generation with geopolymer. The geopolymer–zeolite composites have attracted lots of attention as they can combine the advantages of geopolymers (excellent mechanical properties, easy forming, etc.) and zeolite (high surface area, high porosity and pore volume, etc.). Furthermore, ceramics or ceramics-matrix composites can be obtained after high-temperature treatment of geopolymer-matrix. Comparing with polymer-derived ceramics, geopolymer-derived ceramics showed significant advantage such as low cost, high ceramic yield, low shrinkage, and so on. Therefore, further understanding (fabrication, characterization, application, etc.) in both the geopolymer-derived zeolite or ceramics is meaningful and necessary to explore the potential of geopolymer precursor matrix materials.

The potential topics include, but are not limited to:

  • Geopolymer derived zeolite and composites;
  • Zeolite–geopolymer composites;
  • Ceramics derived from geopolymer;
  • Geopolymer precursor.

Dr. Chengying Bai
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Crystals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • geopolymer derived zeolite
  • geopolymer derived ceramics
  • zeolite-like composites
  • porous materials
  • geopolymer
  • inorganic polymers

Published Papers (4 papers)

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Research

17 pages, 7705 KiB  
Article
The Use of Recycled Aggregate Sludge for the Preparation of GGBFS and Fly Ash Based Geopolymer
by Yi-Chen Chen, Wei-Hao Lee and Yung-Chin Ding
Crystals 2021, 11(12), 1486; https://doi.org/10.3390/cryst11121486 - 30 Nov 2021
Cited by 5 | Viewed by 1656
Abstract
Aggregate sludge is a waste product produced from crushing, screening, and washing processes at aggregate plants. Because of the large quantity and high treatment cost of this sludge, it cannot be disposed of as landfill, and thus, has caused environmental concern over the [...] Read more.
Aggregate sludge is a waste product produced from crushing, screening, and washing processes at aggregate plants. Because of the large quantity and high treatment cost of this sludge, it cannot be disposed of as landfill, and thus, has caused environmental concern over the years in Taiwan. In this preliminary study, the recycled aggregate sludge was reutilized for construction applications through the geopolymerization process. The ground granulated blast furnace slag (GGBFS) and fly ash (FA) were selected as alkaline activated materials for the fabrication of sludge geopolymer. Several process parameters that may affect the mechanical and physical properties of geopolymer were investigated. These parameters are sludge/GGBFS/FA ratios, solid/liquid (alkali solution) ratio, the molarity of NaOH, and curing time. According to the test results, the compressive strength of geopolymer specimens (70/30 sludge/GGBFS ratios) made with 4 M and 6 M NaOH can reach 39.17 MPa and 43.6 MPa after 28 days of curing. The specimen made with 60/40 sludge/GGBFS ratios has a strength of 61.3 MPa. After replacing GGBFS with 10% fly ash (70/20/10 sludge/GGBFS/FA), the strength of the specimen can also reach 43 MPa. According to the test results obtained in this study, it was found that the higher the NaOH concentration, the higher the strength of the geopolymer, and the GGBFS also can contribute more to the mechanical properties of geopolymer than fly ash. This preliminary study suggests that it is possible to reutilize aggregate sludge for construction applications and solve its environmental disposal problem. Full article
(This article belongs to the Special Issue Geopolymer-Derived Zeolite or Ceramics)
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14 pages, 4292 KiB  
Article
Effects of Si/Al Ratios on the Bulk-Type Zeolite Formation Using Synthetic Metakaolin-Based Geopolymer with Designated Composition
by Guoru Ma, Chengying Bai, Meirong Wang and Peigang He
Crystals 2021, 11(11), 1310; https://doi.org/10.3390/cryst11111310 - 27 Oct 2021
Cited by 11 | Viewed by 2174
Abstract
In this paper, synthetic metakaolin with fixed composition (Al2O3·2SiO2) was produced by a simple chemosynthetic route. The chemosynthetic metakaolin can eliminate the influence of impurities in metakaolin from natural kaolin minerals. The synthetic metakaolin together with NaOH [...] Read more.
In this paper, synthetic metakaolin with fixed composition (Al2O3·2SiO2) was produced by a simple chemosynthetic route. The chemosynthetic metakaolin can eliminate the influence of impurities in metakaolin from natural kaolin minerals. The synthetic metakaolin together with NaOH and SiO2-sol were used to prepare Na-based geopolymer precursors with various molar ratios of Si/Al. The molar ratios of Si/Al from 1 to 2 were tailored by adding different contents of SiO2-sol. Zeolite/geopolymer composites or monolith-type zeolite were successfully fabricated from synthetic metakaolin-based geopolymer through a hydrothermal process. The effects of Si/Al ratios on the phase composition and microstructure of the produced zeolite/geopolymer composites or zeolites were studied. The results proved that the composition of synthetic metakaolin and geopolymer precursors can be facilely tuned, and the monolithic geopolymer precursors can be mostly, or even totally, transformed into zeolite after hydrothermal treatment. Full article
(This article belongs to the Special Issue Geopolymer-Derived Zeolite or Ceramics)
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9 pages, 2754 KiB  
Article
Preparation and Characterization of Mesoporous Silica from Bagasse Bottom Ash from the Sugar Industry
by Noorul Amin, Saeed Gul, Sabiha Sultana and Sultan Alam
Crystals 2021, 11(8), 938; https://doi.org/10.3390/cryst11080938 - 12 Aug 2021
Cited by 6 | Viewed by 2241 | Retraction
Abstract
A novel and sustainable process to recycle an environmentally injurious material rich in silica—waste bagasse bottom ash from the sugar industry—into mesoporous pure silica of high purity is reported. Bagasse bottom ash (BBA) is a major byproduct of the sugar industry, with very [...] Read more.
A novel and sustainable process to recycle an environmentally injurious material rich in silica—waste bagasse bottom ash from the sugar industry—into mesoporous pure silica of high purity is reported. Bagasse bottom ash (BBA) is a major byproduct of the sugar industry, with very inadequate recycling possibilities due to environmentally detrimental pollutants, whose production is dramatically increasing. In this study, for the first time, more than 70% of the silica from the bottom ash could be extracted for the synthesis of mesoporous silica using a low-temperature alkaline dissolution method instead of the customary elevated-temperature process. Furthermore, the process of dissolution was thoroughly studied to obtain the essential insight into silica hydrolysis that is largely missing from the existing research literature. Under alkaline conditions, the hydrolysis of silica is hindered due to the formation of zeolites and protective layers around the etching particles. This layer becomes a protective barrier that hinders the mass transfer of silica monomers to the solution, thus halting the dissolution process. Therefore, sequential extractions with optimized conditions of 100 °C for 72 h were employed to attain maximum silica extraction efficiency. Full article
(This article belongs to the Special Issue Geopolymer-Derived Zeolite or Ceramics)
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12 pages, 1767 KiB  
Article
Impact of Synthetic Parameters on the Compressive Strength of Bagasse Ash-Clay Geopolymer
by Noorul Amin, Saeed Gul, Sabiha Sultana, Sultan Alam and Amir Naveed
Crystals 2021, 11(8), 937; https://doi.org/10.3390/cryst11080937 - 12 Aug 2021
Cited by 1 | Viewed by 1417
Abstract
The impact of different parameters on the compressive strength of geopolymer synthesized from clay and bagasse bottom ash is reported. Geopolymer was synthesized from thermally activated clay and bottom bagasse ash using sodium silicate and sodium hydroxide as activator. The maximum dissolution of [...] Read more.
The impact of different parameters on the compressive strength of geopolymer synthesized from clay and bagasse bottom ash is reported. Geopolymer was synthesized from thermally activated clay and bottom bagasse ash using sodium silicate and sodium hydroxide as activator. The maximum dissolution of alumina and silica from the bagasse ash and clay maintaining different alkali conditions is studied. The resulting geopolymer synthesized under different conditions is studied for compressive strength. Different characterizations of the resulting geopolymer were carried out using different analytical instruments. The results indicated that the dissolution and strength of geopolymer have close relationships with the alkali concentration, solution to solid ratio and curing period. The highest compressive strength of 25 MPa was observed for 8M NaOH, 24 MPa for 0.3 solution to solid ratio, 30 MPa for 60% clay and 30 MPa for 27 days of compressive strength. Full article
(This article belongs to the Special Issue Geopolymer-Derived Zeolite or Ceramics)
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