Synthesis of fly ash-based self-supported zeolites foam geopolymer via saturated steam treatment

Han, Lupeng; Wang, Jixiang; Liu, Ze; Zhang, Yanbo; Jin, Yuxuan; Li, Jiaxing; Wang, Dongmin

doi:10.1016/j.jhazmat.2020.122468

Cited by 62 publications

(9 citation statements)

References 51 publications

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“…A flow diagram for the preparation of AFs is presented in Figure 2 . Based on previous research [ 32 ], firstly, sodium hydroxide, water glass, and H 2 O were mixed to obtain the required modulus and concentration of the AA, as given in Table 2 . Secondly, 400 g MLS powder was weighed, mixed with AA, and stirred for 2 min.…”

Section: Materials and Experimentsmentioning

confidence: 99%

In-Situ Crystallization and Characteristics of Alkali-Activated Materials-Supported Analcime-C from a By-Product of the Lithium Carbonate Industry

et al. 2022

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The present study proposes a new process for synthesis of alkali-activated materials (AAM)-supported analcime-C foam materials (AFs), utilizing a by-product of the lithium carbonate industry. This material has great application value as a bulk-type solid adsorbent. Characterization analyses show that the alkaline activator modulus greatly affects the crystallinity of analcime-C in AFs. Furthermore, the compressive strength, zeolite yield, and microstructure of AFs are significantly affected by the saturated steam parameters, including crystallization pressure, temperature, and time. The synthesized materials comprise pores of different sizes (micro to macro). They combine the functional micro-porosity of the analcime-C, the meso-porosity of the gel matrix, and the macro-porosity of the foamed AAM. The maximum compressive strength, density, total porosity, and Pb2+ adsorption capacity of AFs investigated in this study are 1.15 MPa, 350 kg/m3, 76.5%, and 69.3 mg/g Pb2+, respectively. Unlike many granular adsorbents, the bulk AFs adsorbent produced by this process is easy to recycle. In addition, it also contributes to the comprehensive utilization of a by-product of the lithium carbonate industry.

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Section: Materials and Experimentsmentioning

confidence: 99%

In-Situ Crystallization and Characteristics of Alkali-Activated Materials-Supported Analcime-C from a By-Product of the Lithium Carbonate Industry

et al. 2022

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“…The development of sustainable and low-energy geopolymer technology for the reutilization of industrial wastes or by-products has attracted increasing attention in today's resource-constrained and critical environment [3][4][5][6][7][8][9][10][11][12][13][14]. Geopolymers fabricated in an alkaline solution and aluminosilicate materials fabricated by dissolution, reorientation, polycondensation, and polymerization reactions possess three-dimensional silico-aluminate frameworks where all the shared oxygen atoms are linked with SiO 4 and AlO 4 tetrahedra [15,16]. The presence of alkali cations balances the charge deficit of aluminum ions in four-fold coordination.…”

Section: Introductionmentioning

confidence: 99%

The Performance and Reaction Mechanism of Untreated Steel Slag Used as a Microexpanding Agent in Fly Ash-Based Geopolymers

Zang,

Yao,

et al. 2024

Buildings

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Steel slag is an industrial by-product of the steelmaking process, which is under-utilized and of low value due to its characteristics. Alkali-activated technology offers the possibility of high utilization and increased value of steel slag. A geopolymer composition was composed of steel slag, fly ash, and calcium hydroxide. Four experimental groups utilizing steel slag to substitute fly ash are established based on varying replacement levels: 35%, 40%, 45%, and 50% by mass. The final samples were characterized by compressive strength tests, and Fourier-transform infrared spectroscopy measurements, thermogravimetric measurements, scanning electron microscopy with energy dispersive spectroscopy, X-ray diffraction, and mercury intrusion porosimetry were used to investigate the chemical composition and microstructure of the final products. Higher steel slag/fly ash ratios lead to a lower bulk density and lower compressive strength. The compressive strength ranges from 3.7 MPa to 5.6 MPa, and the bulk density ranges from 0.85 g/cm3 to 1.13 g/cm3. Microstructural and energy-dispersive X-ray spectroscopy analyses show that the final geopolymer products were a type of composite consisting of both calcium aluminate silicate hydrate and sodium aluminate silicate hydrate, with the unreacted crystalline phases acting as fillers.

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“…Currently, foamed precursors have attracted increasing attention due to their higher surface area, large pore volume and excellent cation exchange capacity [17][18][19][20]. However, many factors affect the properties of foamed precursors, including curing temperature, activator type/concentration, Si/Al ratio, and curing time [21][22][23][24][25], which directly impact the performance of the nal zeolite products. Moreover, the pore size distribution of foamed precursors produced by common physical foaming and chemical foaming is uneven and uncontrollable [26].…”

Section: Introductionmentioning

confidence: 99%

Effects of Curing Temperature and Water Glass Modulus on the Preparation of Hierarchical Zeolite Precursors

Zhou

Wang

et al. 2023

Silicon

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The hierarchical design of zeolite materials from alkali-activated solid waste is a controversial topic. Deactivated ZSM-5 can serve as a potential foaming material for the preparation of porous zeolite precursors. This article evaluated the suitability of deactivated ZSM-5 for the preparation of porous zeolite material precursors. Curing temperature and water glass modulus were selected to regulate the properties of alkali-activated cementitious material. Two different moduli of water glass (1.4 M and 2.0 M) were applied to determine the effect of samples cured at three temperatures (25 ℃, 50 ℃ and 75 ℃).Characterization analyses such as XRD, FTIR, TG/DTA, SEM/EDS and MIP were performed to analyse the nal products and pore structure of the precursors. A higher curing temperature and alkalinity have a substantial in uence on the mechanical properties and yield a higher degree of polymerization of the reaction products. The main reaction product in the precursors was the N-A-S-H gel, whose degree of polymerization is strongly in uenced by the Si/Al ratio. The purpose of this article is to design porous structures for zeolite precursors. The research results provide promising guidance for the preparation of zeolites with more active sites, high strength and porous structures that are self-supported.

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Synthesis of fly ash-based self-supported zeolites foam geopolymer via saturated steam treatment

Cited by 62 publications

References 51 publications

In-Situ Crystallization and Characteristics of Alkali-Activated Materials-Supported Analcime-C from a By-Product of the Lithium Carbonate Industry

In-Situ Crystallization and Characteristics of Alkali-Activated Materials-Supported Analcime-C from a By-Product of the Lithium Carbonate Industry

The Performance and Reaction Mechanism of Untreated Steel Slag Used as a Microexpanding Agent in Fly Ash-Based Geopolymers

Effects of Curing Temperature and Water Glass Modulus on the Preparation of Hierarchical Zeolite Precursors

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