Sustainable glass-ceramic foams manufactured from waste glass bottles and bentonite

Costa, Fabiana Pereira da; Morais, Crislene Rodrigues da Silva; Rodrigues, Alisson Mendes

doi:10.1016/j.ceramint.2020.04.107

Cited by 52 publications

(32 citation statements)

References 28 publications

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“…X-ray diffraction was performed using a Shimadzu XRD6000 (CuKα, 40kV/30mA). All the experiments were performed at room temperature, with a goniometer speed of 2 • /min, an angular step of 0.02, and a counting time 0.6 s [46][47][48]. The granulometric analysis was performed by low-angle laser light scattering (Cilas, 1064LD, Orléans, France), where the clays were scattered in 250 mL of distilled water in a Hamilton Beach N5000 stirrer at a speed of 17,000 rpm for 10 min; then, the scatterings were inserted in the equipment in wet mode until they reached the optimal concentration of 150 units of diffraction/incidence area [49,50].…”

Section: Characterizationmentioning

confidence: 99%

Adsorption of Anionic Dye on the Acid-Functionalized Bentonite

et al. 2020

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The efficiency of acid treatment on natural calcium bentonite (natural bentonite) for anionic dye adsorption was investigated using methyl orange (MO) as a probe. Additionally, adsorption experiments were accomplished between the natural bentonite, acidified bentonite, and a cationic dye (methylene blue, MB). Acid functionalization in natural bentonite (RF) was carried out with HCl and H2SO4 acids (RF1 and RF2, respectively). The samples were characterized by chemical analysis, mineralogy, particle size, and thermal behavior with the associated mass losses. The adsorption efficiency of MO and MB dyes was investigated by the effects of the initial concentration of adsorbate (Ci) and the contact time (tc). The acid treatment was efficient for increasing the adsorption capacity of the anionic dye, and the Qmaxexp values measured were 2.2 mg/g, 67.4 mg/g e 47.8 mg/g to RF, RF1 e RF2, respectively. On the other hand, the acid functionalization of bentonite did not significantly modify the MB dye adsorption. The Sips equation was the best fit for the adsorption isotherms. Thus, we found that the acid-functionalized bentonite increases the anionic dye adsorption by up to 8000%. The increased adsorptive capacity of acidified bentonite was explained in terms of electrostatic attraction between the clay surface and the dye molecule.

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Section: Characterizationmentioning

confidence: 99%

Adsorption of Anionic Dye on the Acid-Functionalized Bentonite

et al. 2020

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“…It is known that the particle size distribution significantly influences the packing of particles and the product sintered. The smaller particle size leads to greater surface area and reactivity between the particles, which favors the reactions kinetics and the diffusion process during the phase transformations [ 17 , 23 , 24 ]. This contributed to limit the number of tailings added to ceramic mass due to the coarser particle size of the waste compared with feldspar.…”

Section: Resultsmentioning

confidence: 99%

“…The CO 2 increases the pressure inside the material’s closed pores compromises the densification and consequent retraction of the material. The decrease in water absorption (WA) ( Figure 8 c) with the increase in sintering temperature is related to the filling of the pores by the liquid phase that was formed in greater quantities at higher temperatures [ 17 , 24 ]. This implied a decrease in the apparent porosity and a consequent increase in mechanical strength.…”

Section: Resultsmentioning

confidence: 99%

“…Each experiment was repeated 10 times for different samples. The procedures for carrying out these tests are described in other works [ 15 , 16 , 17 ].…”

Section: Methodsmentioning

confidence: 99%

“…Each experiment was repeated 10 times for different samples. The procedures for carrying out these tests are described in other works [15][16][17]. Figure 1 shows XRD patterns measured from raw materials (kaolin, plastic clay, quartz, feldspar, and scheelite tailing).…”

Section: Samples Characterizations After Sintering Treatmentmentioning

confidence: 99%

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Development of Scheelite Tailings-Based Ceramic Formulations with the Potential to Manufacture Porcelain Tiles, Semi-Stoneware and Stoneware

et al. 2020

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New ceramic formulations based on scheelite tailing were developed, and their potential in the ceramic industry was evaluated. Green bodies with different contents of scheelite tailing (0–8 wt%) were sintered (1150 °C, 1200 °C, and 1250 °C) and characterized in terms of the main mineralogical phases, microstructure, and physico-mechanical properties. The mullite was the main phase identified in all sintered temperatures. This result was also ratified with the aid of scanning electron microscope (SEM) images, in which small needles of the mullite were detected. The presence of mullite is required because it contributes to increasing the mechanical resistance of the material. The physico-mechanical properties measured (water absorption, linear shrinkage, apparent porosity, and flexural strength) were compared to the ISO 13006, and the samples sintered at 1150 °C presented potential to be used as semi-stoneware, while those sintered at 1200 °C and 1250 °C can be employed stoneware and porcelain tiles, respectively.

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Glass‐ceramic: Controlled crystallization of glasses obtained from biomass ash

Dias,

Leme,

dos Santos

et al. 2023

Int J Ceramic Engine & Sci

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In this work, vitreous material was produced, using ash from burning wood in a boiler, to obtain a glass‐ceramic with the gehlenite phase. The glass obtained by melt‐quenching at 1450°C was characterized by differential scanning calorimetry and other techniques to determine the glass transition and crystallization temperatures, and crystallization kinetics were investigated using the Kissinger model. Tablets prepared with glass powder were treated at 970, 990, 1074, and 1120°C for 1 h, to obtain the glass‐ceramic material. The phase identified by X‐ray diffraction was gehlenite, with two crystalline structures coexisting in the sample. According to the kinetics study, the phase with a tetragonal structure had a lower crystallization activation energy, and therefore, it may have been the first phase to be formed in the material. Scanning electron microscopy images revealed crystalline regions within the glassy matrix with a lamellar microstructure, with no geometrically defined morphology and no morphological or microstructural distinction, suggesting that both gehlenite phases coexist without apparent distinctions in the glass‐ceramic. The best results for water absorption, apparent porosity, and apparent density were for the glass‐ceramic sample sintered at 990°C, whose values were respectively 0.1, 0.29, and 2.89 g/cm3.

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Sustainable glass-ceramic foams manufactured from waste glass bottles and bentonite

Cited by 52 publications

References 28 publications

Adsorption of Anionic Dye on the Acid-Functionalized Bentonite

Adsorption of Anionic Dye on the Acid-Functionalized Bentonite

Development of Scheelite Tailings-Based Ceramic Formulations with the Potential to Manufacture Porcelain Tiles, Semi-Stoneware and Stoneware

Glass‐ceramic: Controlled crystallization of glasses obtained from biomass ash

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