Zeolite A synthesis employing a brazilian coal ash as the silicon and aluminum source and its applications in adsorption and pigment formulation

Bieseki, Lindiane; Penha, Fábio G.; Pergher, Sibele B. C.

doi:10.1590/s1516-14392012005000144

Cited by 29 publications

(19 citation statements)

References 15 publications

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“…XRD results for commercial zeolite samples showed similar patterns as those obtained with the joint committee of powder diffraction standard powder diffraction database file and previous studies (Treacy and Higgins 2007;Teber et al 2010). Peaks typical of zeolite type A were found at 2θ = 7.1°, 10.1°, 22.4°, and 27.1° (Sharma et al 2012;Bieseki et al 2013). XRD results for zeolite type A showed the existence of feldspar in the zeolite structure due to the appearance of XRD peaks at 2θ = 16.2° and 34.3° (Zheng et al 2012).…”

Section: Resultssupporting

confidence: 80%

“…XRD results for zeolite type A showed the existence of feldspar in the zeolite structure due to the appearance of XRD peaks at 2θ = 16.2° and 34.3° (Zheng et al 2012). The reflections at 2θ = 20.8° and 26.6° in faujasite (Y) and mordenite zeolite showed a large quantity of quartz and a smaller amount of feldspar compared to zeolite type A (Szostak 1998;Mohamed et al 2005;Bieseki et al 2013). High-intensity M-CLZ peaks were found at 2θ = 10.8°, 22.7°, 24.5°, and 30.3°, which correspond to the existence of clinoptilolite zeolite in the sample (Muir et al 2016).…”

Section: Resultsmentioning

confidence: 99%

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Formaldehyde Adsorption into Clinoptilolite Zeolite Modified with the Addition of Rich Materials and Desorption Performance Using Microwave Heating

Kalantarifard¹,

Gon²,

Yang³

2016

Terr. Atmos. Ocean. Sci.

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Granite, bentonite, and starch were mixed with clinoptilolite zeolite to produce a modified zeolite. The modified zeolite was tested for its ability to absorb formaldehyde from air. The modified sample formaldehyde adsorption capacity was then compared with those of commercially available clinoptilolite, faujasite (Y), mordenite, and zeolite type A. Studies were focused on the relationships between the physical characteristics of the selected zeolites (crystal structure, surface porosity, pore volume, pore size) and their formaldehyde adsorption capacity. The removal of starch at high temperature (1100°C) and addition of bentonite during modified clinoptilolite zeolite (M-CLZ) preparation generated large pores and a higher pore distribution on the sample surface, which resulted in higher adsorption capacity. The formaldehyde adsorption capacities of M-CLZ, clinoptilolite, faujasite (Y), zeolite type A, and mordenite were determined to be 300. 5, 194.5, 123.7, 106.7, and 70 mg per gram of zeolite, respectively. The M-CLZ, clinoptilolite, and faujasite (Y) crystals contained both mesoporous and microporous structures, which resulted in greater adsorption, while the zeolite type A crystal showed a layered structure and lower surface porosity, which was less advantageous for formaldehyde adsorption. Furthermore, zeolite regeneration using microwave heating was investigated focusing on formaldehyde removal by desorption from the zeolite samples. XRD, XRF, N 2 adsorption/desorption, and FE-SEM experiments were performed to characterize the surface structure and textural properties the zeolites selected in this study.

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Section: Resultssupporting

confidence: 80%

Section: Resultsmentioning

confidence: 99%

Formaldehyde Adsorption into Clinoptilolite Zeolite Modified with the Addition of Rich Materials and Desorption Performance Using Microwave Heating

Kalantarifard¹,

Gon²,

Yang³

2016

Terr. Atmos. Ocean. Sci.

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“…In all samples, typical cubical structure, that may belong to zeolite A or zeolite X, were observed (Figure 6a). 23,55,56 The presence of zeolite X was also observed by XRD analysis ( Figure S1), but in very low levels. For the second zeolite product investigated, SEM images (Figure 6b) illustrate first stage of zeolite Na-P1 formation over a partially activated CFA spheres.…”

Section: Zeolite Characterization Identification and Purity Of Zeolitmentioning

confidence: 79%

Integrated Synthesis of Zeolites Using Coal Fly Ash: Element Distribution in the Products, Washing Waters and Effluent

Ferrarini¹,

Cardoso²,

Paprocki³

et al. 2016

Journal of the Brazilian Chemical Society

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Coal fly ash has been proposed as an alternative raw material for zeolite synthesis, however, the mobilization of toxic elements of this material into zeolite products, washing water and effluent is rarely addressed. In this study, Brazilian coal fly ash was used in the integrated synthesis (two steps) of zeolites Na-P1 and 4A and the distribution of approximately 40 major, minor and trace elements was investigated in all the input and output flows involved in the process. The mobilization of several elements was observed in the zeolite products, a number of which are highly toxic, such as As, Cd, Cr, Ni and Pb. With regard to the amount present in the ash, both zeolites were enriched in several elements, such as Ni in zeolite Na-P1 and As in zeolite 4A. The latter exhibited high purity, with most of the elements investigated having concentrations close to those measured in commercial zeolite 4A. Important information was gathered regarding zeolite synthesis using fly ash, which will ensure safer application of these materials and, if necessary, propose a contaminant-free synthesis route.

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“…The low solubility of these minerals in NaOH and likely saturation of the reactive medium with Si and Al explain this behavior. According to Bieseki et al, 42 the original quartz present in the coal ash did not react during zeolite formation. The chemical composition of zeolites Na-P1 and 4A obtained in process A are shown in Figure 3 (also see Table S2).…”

Section: Zeolite Characterizationmentioning

confidence: 94%

Evaluation of the Sustainability of Integrated Hydrothermal Synthesis of Zeolites Obtained from Waste

Ferrarini¹,

Cardoso²,

Alban³

et al. 2018

J. Braz. Chem. Soc.

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The high Si and Al contents in the amorphous phase of coal fly ash have been used for its conversion into zeolites. This process converts a toxic low-value by-product into a product used in a number of environmental applications, but has the disadvantage of introducing contaminants. Despite the large number of studies on the conversion of fly ash into zeolites, few report this drawback or discuss the efficiency of the proposed processes from a technical or ecological perspective. In this respect, the present study conducts a detailed assessment of two routes for integrated hydrothermal synthesis of zeolites 4A and Na-P1 obtained from coal fly ash. The processes are evaluated and compared in relation to the presence of undesirable metals and elements in the different steps of synthesis, as well as the feedstock and final product. Different performance parameters are presented and applied in the assessment of both processes and the most sustainable is recommended.

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Zeolite A synthesis employing a brazilian coal ash as the silicon and aluminum source and its applications in adsorption and pigment formulation

Cited by 29 publications

References 15 publications

Formaldehyde Adsorption into Clinoptilolite Zeolite Modified with the Addition of Rich Materials and Desorption Performance Using Microwave Heating

Formaldehyde Adsorption into Clinoptilolite Zeolite Modified with the Addition of Rich Materials and Desorption Performance Using Microwave Heating

Integrated Synthesis of Zeolites Using Coal Fly Ash: Element Distribution in the Products, Washing Waters and Effluent

Evaluation of the Sustainability of Integrated Hydrothermal Synthesis of Zeolites Obtained from Waste

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