Crystal Chemical and Structural Characterization of Natural and Cation-Exchanged Mexican Erionite

Quiroz-Estrada, Karla; Pacella, Alessandro; Ballirano, Paolo; Hernández-Espinosa, Miguel Ángel; Felipe, Carlos; Esparza-Schulz, Marcos

doi:10.3390/min10090772

Cited by 3 publications

(4 citation statements)

References 54 publications

(83 reference statements)

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“…Figure 3 shows erionite and alumina (Al 2 O 3 ) micrographs at 5000 amplifications. For erionite some border particles well defined is observed with morphology of elongated prisms as reported in the literature [ 20 ], the rest of the particles do not show a defined shape and are presented in aggregates with particles of different sizes. In the case of alumina, larger particles appear to be covered with small particles, and they do not have uniform shapes or sizes.…”

Section: Resultssupporting

confidence: 63%

“…In natural erionite zeolite, microporous porosity is predominant with volume calculated around 0.11 cm 3 /g, and its BET surface area was reported 303.4 m 2 /g [ 20 ]. An important research area of applications for Mexican erionite is the retention of cations such as cobalt, cadmium, and thorium from aqueous solutions due to its cation exchange capacity higher than other zeolites.…”

Section: Discussionmentioning

confidence: 99%

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Degradation of dye containing in textile wastewater by sequential process: photocatalytic and biological treatment

HERNANDEZ¹,

OSORIO²,

ARIAS³

et al. 2022

Turkish Journal of Chemistry

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In this research, a combined photocatalytic and biological treatment is proposed for the elimination of pollutants present in textile wastewater using a natural erionite zeolite (PE) and aluminum oxide (PA) synthesized by the sol-gel method as photocatalysts, and solar radiation. Both catalysts were characterized by XRD, SEM, and EDS. For biological treatment two bacterial consortium were used: BC1 (Escherichia coli N16, Serratia k120, Pseudomonas putida B03 and Enterobacter hormaechei ), and consortium BC2 ( Escherichia coli N16, Serratia Mc107, Enterobacter N9, Enterobacter hormaechei Mc9 ). The photocatalytic and microbiological treatments were carried out initially separately and subsequently in a sequential manner, first the photocatalytic followed by the microbiological to determine if a synergistic effect was achieved. Comparing the photocatalytic performance, erionite showed higher performance of dyes degradation (54.75%) than alumina (28.62%). While in the biological process, BC1 decreased the dye concentration to 56.93% and BC2 to 53.56%. Finally, the best combined process was PA+BC1 reaching pollutants degradation 64.62%, showing that the application of both processes promotes a decolorization in textile wastewater. The water resulting from the combined photocatalysis-microbiological degradation processes was tested for toxicity using Daphnia magna , obtaining that none of the effluents shows toxicity.

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Section: Resultssupporting

confidence: 63%

Section: Discussionmentioning

confidence: 99%

Degradation of dye containing in textile wastewater by sequential process: photocatalytic and biological treatment

HERNANDEZ¹,

OSORIO²,

ARIAS³

et al. 2022

Turkish Journal of Chemistry

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“…In fact, a transient uptake of Ca from the solution was observed after 48 h. However, an almost perfect recovery of the initial structural state, coupled with the appearance of amorphous material (subsequently confirmed from HR-TEM images by Matassa et al [38]) and the precipitation of calcite, was noticed after four months of incubation. Recently, the uptake of Ca by a sample of erionite-Na incubated in a CaCl 2 solution has been reported by Quiroz-Estrada et al [78].…”

Section: Structural Modificationsmentioning

confidence: 85%

Surface and Bulk Modifications of Fibrous Erionite in Mimicked Gamble’s Solution at Acidic pH

et al. 2021

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This study aimed at investigating both the surface and bulk modifications occurring on fibrous erionite during leaching in a mimicked Gamble’s solution (MGS) at pH of 4.5 and T = 37 °C, up to one month of incubation. Samples were characterized by a multi-analytical approach: field-emission scanning electron microscopy (FE-SEM) was employed to investigate the morphological changes of both pristine and reacted fibres, inductively coupled plasma optical emission spectrometry (ICP-OES) was used to measure the concentration of the released cations; X-ray photoelectron spectroscopy (XPS) was exploited for highlighting possible modifications of surface chemistry; X-ray powder diffraction (XRPD) and high-resolution transmission electron microscopy (HR-TEM) were applied aiming to get information on the structural state of the fibres following the incubation. ICP results integrated with those obtained by both bulk- and surface-chemical characterization highlighted that erionite binds Na especially in the first 24 h of sample incubation in the MGS, following ion exchange with the extra framework cations, in particular Ca. Moreover, our new results show that the Na binding process caused structural modifications with the migration of Na toward the Ca2 site and redistribution of the cations within the erionite cage. TEM investigation pointed out that the interaction between erionite and MGS results in the formation of a new surface amorphous layer with an irregular lobate pattern on an earlier surface weathered layer. However, the silicate framework is not weakened by incubation in the MGS at acidic pH. In addition, on the basis of the Si release normalized to the mineral surface area, fibrous erionite resulted significantly more biodurable than amphibole asbestos. Notably, considering the primary role played by biodurability in inducing pathogenicity, this result certainly supports in vivo observations showing that erionite is much more tumorigenic than asbestos. Moreover, the ions released by erionite when immersed in MGS may trigger biological effects, such as those on lipid packing and membrane permeability. On this basis, we expect a regulatory definition that would provide protection from this carcinogenic fibre.

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“…The CHAN sample is (label accounts for) the natural chabazite sample, which is free of any treatment. Exchanged chabazite samples CHACa X , CHAMg X , and CHANa X were prepared from CHAN precursor and exchanged either X = 1, 2, or 3 times with 0.01 N solutions of the corresponding cation chloride salts (i.e., CaCl 2 , MgCl 2 , and NaCl) at 50 • C for 6 h. XRD studies were determined through a Bruker D8 diffractometer (Bruker, Co., Billerica, MA, USA) using nickel-filtered CuKα (λ = 0.154 nm) radiation operated at 40 kV and 30 mA [19]. The patron was refined by the Rietveld method to confirm the composition of crystalline phases.…”

Section: Methodsmentioning

confidence: 99%

Nanoporosity and Isosteric Enthalpy of Adsorption of CH4, H2, and CO2 on Natural Chabazite and Exchanged

et al. 2022

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This paper describes the isosteric enthalpy through narrow pores at low levels of coverage through adsorption of CO2, CH4, and H2 on pores in natural chabazite exchanged with aqueous solutions of Na+, Mg2+, and Ca2+ salts at different concentrations, and with variable time and temperature of treatment. Experimental data of CO2, CH4, and H2 adsorption were treated by the Freundlich and Langmuir equations. Complementarily, the degree of interaction of these gases with these zeolites was evaluated by the evolution of isosteric enthalpy of adsorption. The exchange with Mg2+ and Na+ favors an increase in the adsorption capacity for CO2. while that of Ca2+ and Mg2+ favor adsorption through to H2 and CH4. These cations occupy sites in strategic positions S4 and S4’, which are located in the channels and nanocavities of these zeolites. The presence of Ca2+ and Mg2+ at S4 and S4′ sites causes increased adsorption into the nanocavities and on the external area of the ion-exchanged zeolites. Depending on the conditions of the exchange treatment, Ca2+ and Mg2+, and Na+ were found to be most favorable, well distributed, and accessible for CO2, CH4, and H2 adsorption.

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Crystal Chemical and Structural Characterization of Natural and Cation-Exchanged Mexican Erionite

Cited by 3 publications

References 54 publications

Degradation of dye containing in textile wastewater by sequential process: photocatalytic and biological treatment

Degradation of dye containing in textile wastewater by sequential process: photocatalytic and biological treatment

Surface and Bulk Modifications of Fibrous Erionite in Mimicked Gamble’s Solution at Acidic pH

Nanoporosity and Isosteric Enthalpy of Adsorption of CH4, H2, and CO2 on Natural Chabazite and Exchanged

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