The effects of metakaolinization and fused-metakaolinization on zeolites synthesized from quartz rich natural clays

Otieno, Stephen; Kengara, Fredrick Orori; Kemmegne‐Mbouguen, Justin Claude; Langmi, Henrietta W.; Kowenje, Chrispin O.; Mokaya, Robert

doi:10.1016/j.micromeso.2019.109668

Cited by 29 publications

(30 citation statements)

References 31 publications

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“…Incorporation of magnetite is expected to ameliorate the surface characteristics of the clay and ease the recovery of the dye-bearing adsorbent by an external magnetic field. (Otieno et al 2019), and the mineralogical phases confirmed by XRD analysis.…”

Section: Introductionmentioning

confidence: 89%

Adsorption isotherm modeling for methylene blue removal onto magnetic kaolinite clay: a comparison of two-parameter isotherms

Shikuku

Mishra

2021

Appl Water Sci

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In this work, kaolinite clay was modified with magnetic magnetite nanoparticles (Fe3O4@MC) by co-precipitation with ferrous and ferric ions as iron precursors to ameliorate its textural and adsorption capacity for methylene blue (MB) dye uptake from synthetic wastewater at low concentrations. The adsorbents were characterized using XRD, BET surface area analysis, VSM, SEM and HRTEM. The BET surface area after chemical treatment increased from 14.616 to 26.913 m2 g−1. The saturation magnetization of Fe3O4@MC was 6.22 emu g−1 and the exhausted adsorbent recoverable by a simple magnet. Adsorption data were modeled using six nonlinear two-parameter isotherm equations, namely Freundlich, Temkin, Fowler–Guggenheim, Elovich, Flory–Huggins and Langmuir model, and the best-fitting model arrived at using three mathematical error functions. MB adsorption onto unmodified clay was best described by the Fowler–Guggenheim isotherm, whereas MB adsorption onto Fe3O4@MC was best described by the Freundlich model. Increase in BET surface area increased the theoretical and experimental maximum adsorption capacity

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Section: Introductionmentioning

confidence: 89%

Adsorption isotherm modeling for methylene blue removal onto magnetic kaolinite clay: a comparison of two-parameter isotherms

Shikuku

Mishra

2021

Appl Water Sci

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“…Over 100 natural zeolites can be distinguished, among which only several types, like clinoptilolite or phillipsite, are accessible for mining and further use. On the contrary, over 150 types of synthetic zeolites have been obtained so far, using various substrates, for example chemicals [ 18 ], clay minerals [ 19 , 20 , 21 ], silicate minerals [ 22 ], rice husk [ 23 , 24 ], or wastes like fly ash (carbon combustion byproduct) [ 9 , 25 , 26 , 27 ]. The use of fly ash to produce zeolites is attracting many enthusiasts because that is one way to minimize waste and is beneficial to the environment.…”

Section: Introductionmentioning

confidence: 99%

Recycling of Waste Solution after Hydrothermal Conversion of Fly Ash on a Semi-Technical Scale for Zeolite Synthesis

et al. 2021

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Nowadays, using fly ash for zeolites production has become a well-known strategy aimed on sustainable development. During zeolite synthesis in a hydrothermal conversion large amount of post-reaction solution is generated. In this work, the solution was used as a substrate for Na-A and Na-X zeolites synthesis at laboratory and technical scale. Obtained materials were characterized using particle size analysis, X-ray diffraction (XRD), X-ray fluorescence spectroscopy (XRF), transmission electron microscopy (TEM), Fourier transformed infrared spectroscopy (FTIR), and nitrogen adsorption/desorption isotherm. Produced zeolites revealed high purity (>98%) and monomineral zeolitic phase composition. The SiO2 content was in the range 39–42% and 40–38%, whereas Al2O3 content was 23–22% and 25–26% for Na-X and Na-A, respectively. TEM and BET analyses revealed Na-X zeolite pores were almost identical to commercial 13X with SBET in the range 671–734 m2/g. FTIR indicated slight differences between materials obtained at laboratory and technical scale in Si-O-(Si/Al) bridges of the zeolitic skeleton. The results showed good replicability of the laboratory process in the larger scale. The proposed method allows for waste solution reusability with a view to highly pure zeolites production in line with circular economy assumptions.

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“…The synthesis of Y zeolite from the raw clay significantly enhanced the surface area and micropore volume from 29 m 2 /g and 0.0016 cm 3 /g to 745 m 2 /g and 0.251 cm 3 /g respectively (Table 3). The synthesized Y zeolite exhibited a pronounced surface area when compared to synthesized Y zeolite in other studies ranging from 346 to 758 m 2 /g [23,34,36,37,39]. Figure 5b shows that the zeolite has two size range micropores-the inner pores of size 0.88 nm and the outer pores 1.84 nm, both corresponding to micropore volume of 0.251 cm 3 /g.…”

Section: Y Zeolite Crystallizationmentioning

confidence: 75%

“…5a). This corresponds to microporous material and the filling of narrow micropores [36,37]. This characteristic of zeolitic material is due to enhanced adsorbent-adsorbate interactions occurring in micropores of molecular dimensions [38].…”

Section: Y Zeolite Crystallizationmentioning

confidence: 99%

Catalytic Pyrolysis of Waste Engine Oil over Y Zeolite Synthesized from Natural Clay

Osei

Nzihou

Yaya

et al. 2020

Waste Biomass Valor

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Cheap alumino-silicate materials such as clay materials and Y zeolite were selected for the catalytic pyrolysis of waste engine oil in a fixed bed reactor. A cheaper route of Y zeolite synthesis involving hydrothermal activation of the raw clay and hydrothermal synthesis was employed. X-ray diffraction technique, scanning electron microscopy, Fourier transform infra-red, and nitrogen desorption method were used to characterize the intermediate phases formed during the hydrothermal treatment of the clay and the synthesized Y zeolite during the hydrothermal processes. The chemical compositions of the liquid phase of catalytic pyrolysis were characterized by gas chromatography coupled with mass spectroscopy (GC-MS). The results revealed that the alkaline concentration strongly influenced the activation of the raw clay to obtain a useful phase for the subsequent synthesis of the Y zeolite. The synthesis improved the surface area from 29 m 2 /g for the clay to 745 m 2 /g for the zeolite. The catalytic pyrolysis resulted in diesel fractions of 64.8 and 54.7%, respectively for the Y zeolite and the clay. It was observed that the gasoline fractions increased to 20.5 and 19.1%, respectively for the zeolite and the clay. In the diesel fraction, the zeolite selectively improved the yield of the cyclo-alkanes which are key constituents in terms of the quality of diesel. Y zeolite was successfully derived from a natural clay and tested in the pyrolysis of waste engine oil. The synthesis route provides the opportunity to improve the catalytic property of the natural clay.

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The effects of metakaolinization and fused-metakaolinization on zeolites synthesized from quartz rich natural clays

Abstract: The effects of metakaolinization and fused-metakaolinization on zeolites synthesized from quartz rich natural clays

Cited by 29 publications

References 31 publications

Adsorption isotherm modeling for methylene blue removal onto magnetic kaolinite clay: a comparison of two-parameter isotherms

Adsorption isotherm modeling for methylene blue removal onto magnetic kaolinite clay: a comparison of two-parameter isotherms

Recycling of Waste Solution after Hydrothermal Conversion of Fly Ash on a Semi-Technical Scale for Zeolite Synthesis

Catalytic Pyrolysis of Waste Engine Oil over Y Zeolite Synthesized from Natural Clay

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