Synthesis of zeolites A and P from 1:1 and HS from 2:1 clays

Meftah, Mahdi; Oueslati, Walid; Amara, Abdesslem Ben Haj

doi:10.1088/1757-899x/13/1/012019

Cited by 10 publications

(5 citation statements)

References 30 publications

(48 reference statements)

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“…58 In the case of LTA synthesis, metakaolinisation is an obligatory step since, in its absence, only sodalite is obtained under the same hydrothermal synthesis conditions. 132–134 After metakaolinisation, the surface of kaolin particles becomes rougher and more chaotic (Fig. 9).…”

Section: Kaolin Pretreatment Methodsmentioning

confidence: 99%

Green and low-cost synthesis of zeolites from kaolin: a promising technology or a delusion?

Zdretsov,

Gerasimov

2024

React. Chem. Eng.

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Section: Kaolin Pretreatment Methodsmentioning

confidence: 99%

Green and low-cost synthesis of zeolites from kaolin: a promising technology or a delusion?

Zdretsov,

Gerasimov

2024

React. Chem. Eng.

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“…Work on the linkage of constraints has not been adequately addressed in the literature. Indeed, Meftah et al (2010) [84] showed that for a well-determined pH value and at a precise temperature clay can permanently change its structure. Thus, Marty et al (2020) [85] explained that the coupling between the chemistry and hydration of clays shows a specific behavior for most water molecules considering RH and interlamellar space composition.…”

Section: Adsorption Science and Technologymentioning

confidence: 99%

“…The clay adsorption capacity and the clay permeability properties are very sensitive to the variation of the soil solution pH [67][68][69][70][71][72], the surrounding temperature gradient [56,67,68,72,73], the kinetic effect during the cation exchange process [74], the surrounding atmospheric pressure variation [75,76], the surrounding relative humidity (RH) con-straint [77][78][79][80][81], the solid-liquid ratio effect during heavy metal removal [41], and the type and nature of the compensating cations [82][83][84][85]. Several works [67][68][69][70][71][72] show that there is a linearly proportional relationship between the pH level fluctuation and the performance of the heavy metal absorber (clay fraction).…”

Section: Introductionmentioning

confidence: 99%

Structural Alteration, Hydration Stability, Heavy Metal Removal Efficiency, and Montmorillonite Porosity Fate by Coupling the Soil Solution pH and a Thermal Gradient

Mejri

Oueslati

Amara

2022

Adsorption Science & Technology

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Clay minerals are considered as a promising material in the context of geological barrier for the confinement of radioactive and industrial waste. Understanding the usefulness of the smectite mineral, in this approach, remains insufficient. The deep investigation about structural response/changes, hydrate stability, cation exchange process, permeability, and heavy metal/radionuclide adsorption/removal efficiency under external constraints is needed. To explore the structural alteration, the hydration stability, and the evolution of montmorillonite porosity under a first order of external applied constraints coupling, a reference Na-rich montmorillonite specimen is used as a starting material, and three exchangeable heavy metal cations (Ba2+, Cu2+, and Co2+) have been selected. The applied constraint coupling is realized at laboratory scale and assured by simultaneously varying of the soil solution pH and the thermal gradient. The evaluation of the mineral fraction response is established by correlation of quantitative XRD analysis results, thermal analysis, and porosity measurements. The quantitative XRD analysis allows rebuilding of the theoretical model describing the interlamellar space (IS) configurations/damages, structural heterogeneity degrees, and hydrous stability. Obtained results show a dominant interstratified hydration character, for all studied complexes, attributed to a new IS organization versus the applied constraint strength. Furthermore, all samples exhibit a heterogeneous hydration behavior traduced by the coexistence of different layers of type population within the crystallite. Additionally, the theoretical XRD profile decomposition allowed us to prove link between the domination of the segregated stacking layers mode against the constraint strength. Thermal analysis allowed us to develop theoretical models describing the decrease of the water molecule amounts as a function of the increase in temperature and soil solution pH. Moreover, a specific hydration footprint response and an interstratification mapping are assigned for each corresponding stress degrees. The evolution of montmorillonite porosity is determined by adsorption measurement, based on Brunauer, Emmett, and Teller (BET) and Barrett-Joyner-Halenda (BJH) pore size distribution analyses which confirms for all samples, the exfoliation process, and the mesopore diameter rise by increasing the constraint intensity.

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“…In the majority of the studies, zeolite A and X were synthesized (Figure ). Forty‐eight studies were considered and analyzed with emphasis on the eight principal synthesized zeolites and six experimental factors .…”

Section: Kaolinitementioning

confidence: 99%

A statistical industrial approach for the synthesis conditions of zeolites using fly ash and kaolinite

Ramírez-Zamora

Solís-López

Robles

et al. 2017

Env Prog and Sustain Energy

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This work describes the statistical analysis carried out on studies of the synthesis of zeolites using fly ash (FA) and kaolinite and shows the main parameters in the hydrothermal synthesis of eight principal zeolites. The chosen zeolites were faujasite (zeolite X), zeolite A, zeolite P, hydroxysodalite, analcime, chabazite, hydroxycancrintie, and sodalite for FA and kaolinite. The statistical analysis consisted of analysis of variance (ANOVA) of the four principal parameters considered: temperature of synthesis, reaction time, Si/Al ratio of the FA and kaolinite and the solid/liquid ratio in the hydrothermal system. For the use of FA, zeolite P, zeolite X, and hydroxysodalite were the three principal synthesized zeolites in the majority of the studies while zeolite A, zeolite P, and sodalite where the three principal zeolites synthesized when kaolinite was used. In general terms, the use of FA required a low temperature and time of synthesis compared to the use of kaolinite. With regard to the Si/Al ratio, the values were similar in both cases, while the solid/liquid ratio for the use of FA was higher than that for kaolinite. Contrast analysis was carried out showing several differences in the synthesis of the eight types of analyzed zeolites.

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Synthesis of zeolites A and P from 1:1 and HS from 2:1 clays

Cited by 10 publications

References 30 publications

Green and low-cost synthesis of zeolites from kaolin: a promising technology or a delusion?

Green and low-cost synthesis of zeolites from kaolin: a promising technology or a delusion?

Structural Alteration, Hydration Stability, Heavy Metal Removal Efficiency, and Montmorillonite Porosity Fate by Coupling the Soil Solution pH and a Thermal Gradient

A statistical industrial approach for the synthesis conditions of zeolites using fly ash and kaolinite

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