Heavy metal fixing and heat resistance abilities of coal fly ash-waste glass based geopolymers by hydrothermal hot pressing

Song, Huiping; Wei, Lifang; Ji, Yinglu; Cao, Lei; Cheng, Fangqin

doi:10.1016/j.apt.2018.03.013

Cited by 36 publications

(3 citation statements)

References 21 publications

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“…Geopolymer has excellent performances [e.g. lower carbon emissions (Abdollahnejad et al , 2015), excellent durability (Thokchom et al , 2011) and impermeability (Mas et al , 2015), chemical corrosion (Sikora et al , 2018)/high-temperature (He et al , 2010)/water and heat resistance (Song et al , 2018), adequate fixation of nuclear waste and active fixation of heavy metal ions (Zhuang et al , 2016)] because of its 3D sponge-like network structure. Green raw materials and pollution-free curing process demonstrate geopolymer broad application prospects in architecture and space construction (Wang et al , 2016), solid waste materials (Ferone et al , 2013a, 2013b) andsealing materials (Komnitsas, 2011).…”

Section: Introductionmentioning

confidence: 99%

Rheology effect and enhanced thermal conductivity of diamond/metakaolin geopolymer fabricated by direct ink writing

Wang

Tang

Liu

et al. 2021

RPJ

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Purpose Traditional simulation research of geological and similar engineering models, such as landslides or other natural disaster scenarios, usually focuses on the change of stress and the state of the model before and after destruction. However, the transition of the inner change is usually invisible. To optimize and make models more intelligent, this paper aims to propose a perceptible design to detect the internal temperature change transformed by other energy versions like stress or torsion. Design/methodology/approach In this paper, micron diamond particles were embedded in 3D printed geopolymers as a potential thermal sensor material to detect the inner heat change. The authors use synthetic micron diamond powder to reinforced the anti-corrosion properties and thermal conductivity of geopolymer and apply this novel geopolymer slurry in the direct ink writing (DIW) technique. Findings As a result, the addition of micron diamond powder can greatly influence the rheology of geopolymer slurry and make the geopolymer slurry extrudable and suitable for DIW by reducing the slope of the viscosity of this inorganic colloid. The heat transfer coefficient of the micron diamond (15 Wt.%)/geopolymer was 50% higher than the pure geopolymer, which could be detected by the infrared thermal imager. Besides, the addition of diamond particles also increased the porous rates of geopolymer. Originality/value In conclusion, DIW slurry deposition of micron diamond-embedded geopolymer (MDG) composites could be used to manufacture the multi-functional geological model for thermal imaging and defect detection, which need the characteristic of lightweight, isolation, heat transfer and wave absorption.

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Section: Introductionmentioning

confidence: 99%

Rheology effect and enhanced thermal conductivity of diamond/metakaolin geopolymer fabricated by direct ink writing

Wang

Tang

Liu

et al. 2021

RPJ

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“…A geopolymers are well-known alkali aluminosilicate cement materials that can have superior mechanical, chemical and thermal properties when compared to other Portland-based cements, showing significantly lower levels of CO 2 production [ 1 ]. Geopolymers form a structure closed cage-like cavity together with combination of ring molecules that can separate metal ions or other toxic substances and catch them inside the cavity.…”

Section: Introductionmentioning

confidence: 99%

Structural and Chemical Properties of Geopolymer Gels Incorporated with Neodymium and Samarium

Nenadović

Kljajević

Ivanović

et al. 2021

Gels

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The present work was focused on doping of 1% and 5% both of Nd2O3 and Sm2O3 in geopolymer gels. One of the main goals was to determine the influence of the behavior of Nd and Sm as dopants and structural nanoparticles changes of the final geopolymer formed. It is shown that the disorder formed by alkali activation of metakaolin can accommodate the rare earth cations Nd3+ and Sm3+ into their aluminosilicate framework structure. The main geopolymerization product identified in gels is Al-rich (Na)-AS-H gel comprising Al and Si in tetrahedral coordination. Na+ ions were balancing the negative charge resulting from Al3+ in tetrahedral coordination. The changes in the structures of the final product (geopolymer/Nd2O3; Sm2O3), has been characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM) analysis with energy dispersive spectrometry (EDS). Nucleation at the seed surfaces leads to the formation of phase-separated gels from rare earth phase early in the reaction process. It is confirmed that Nd and Sm have been shown to form unstable hydroxides Nd(OH)3 and Sm(OH)3 that are in equilibrium with the corresponding oxides.

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“…The most common approaches are encapsulation of heavy metals within a glass, glass-ceramic, or cementitious structures. [22][23][24][25] The aim of this work was focused on encapsulation of heavy metals adsorbed by rice husk within a porous glass-ceramic structure using vitrified bottom ash from municipal solid waste incinerators (MSWI), which in fact is other products based on waste materials. The reason relied on the economic aspects of treating the rice husk.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Pb and Cd in rice husk and their immobilization in porous glass‐ceramic structures

Sharifikolouei

Baino

Galletti

et al. 2019

Int J Applied Ceramic Tech

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Rice husk, an agricultural waste, is abundantly available in many countries such as China, India, Brazil, US, and South East Asia. Despite the massive production of rice husk, it is mainly disposed to landfill. In this work, utilization of rice husk for a potential waste-water treatment is evaluated, along with subsequent encapsulation of the adsorbed heavy metals (Pb and Cd) inside a porous glass-ceramic. Vitrified bottom ash (another source of waste) was mixed with foaming agents in different weight ratios (40:60, 50:50, and 60:40) to prepare a glass matrix for encapsulation of Pb-/ Cd-loaded rice husk. It was shown that using 40 wt% vitrified bottom ash with 60 wt% foaming agents leads to a foam glass with the best pore size distribution. Therefore, this batch was further mixed with 70 volume% (5 wt%) heavy metal-loaded rice husk and was heat-treated at 750°C for 3 hours. The final glass-ceramic porous structure was char acterized using SEM, XRD, compression test, and it was shown that it is safe to be used as it passes the EN12457-2 leaching test.

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Heavy metal fixing and heat resistance abilities of coal fly ash-waste glass based geopolymers by hydrothermal hot pressing

Cited by 36 publications

References 21 publications

Rheology effect and enhanced thermal conductivity of diamond/metakaolin geopolymer fabricated by direct ink writing

Rheology effect and enhanced thermal conductivity of diamond/metakaolin geopolymer fabricated by direct ink writing

Structural and Chemical Properties of Geopolymer Gels Incorporated with Neodymium and Samarium

Adsorption of Pb and Cd in rice husk and their immobilization in porous glass‐ceramic structures

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