Electrochemical Characterization of Carbon Paste Electrodes Modified With Natural Zeolite

Tlacuatl, G. Zacahua; Arellano, Julian; Manzo-Robledo, A.

doi:10.1080/00986440902831797

Cited by 6 publications

(6 citation statements)

References 12 publications

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“…Although there is not peaks related to iron oxides, it was found an experimental evidence that, confirm their presence in the composition (in concentrations very low, that not is possible detect by DRX) in the zeolites; One of them consists in bringing a field closer magnetic (magnet) about a dissolution of water with zeolitic powder (prepared in a flask), after a considerable time, it was observed that a small amount of nanoparticles are attracted toward the magnet surface [12][13][14].…”

Section: X-ray Diffractionmentioning

confidence: 89%

“…The predominant crystalline phases correspond to clinoptilolite, mordenite and, to a lesser extent, α -quartz. From X-ray analysis, the peaks that do not have a label or identification are known to be signals due to erionite, heulandite, feldspar phases [12].…”

Section: X-ray Diffractionmentioning

confidence: 99%

“…Sample results have been submitted of zeolite, where the techniques of XRD and UV-Vis [6,7], concluding in the following: he treatment thermal it affects significantly so much in the size of crystallite, as in the displacement of some peaks of diffraction, besides, it was noticed an increase of the efficiency catalytic, to degrade the textile compound reactivate Black 5. In this work, he analyzed different XRD peaks, with the aim of determine the change of intensity and of FHWM (width to half height), of the zeolite natural calcined to 250 and 500 °C, besides HE calculation the diameter average of crystallite for the phases identified; that's how it was done a characterization structural of the material [7,8].…”

Section: Introductionmentioning

confidence: 99%

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Effect of calcination on the structure of a natural Mexican zeolite: Study by XRD and SEM-EDS

Viveros,

TIacuatl,

Ramírez

et al. 2023

JER

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In the present work it is disclosed the morphological characterization of zeolitic powders, for scanning electron microscopy (SEM by its acronym in English), the results are also attached obtained by energy X-ray spectroscopy dispersive (EDS). This material (HE) subjected to a grinding of 3 hours (ZNM025) and subsequently treated thermally by a period of 4 hours, to temperatures of 250 (ZNM250), 350 (ZNM350) and 500°C (ZNM500), respectively. HE set of samples was characterized to know the changes produced with regard to the sample original (ZNM025). By maintaining a fixed amplification of 1000x, the micrographs show it following: a nonuniform distribution in particle size, the which can be grouped into 4 types; small (< 1 μm), medium (1 -5 μm), large (6 -10 μm), and extra-large (> 10µm). Elemental analysis by EDS confirms the presence of nanoparticles of oxides of iron (Fe x 0 y ); that HE is occluded in the channels and in the pores of the zeolites; which are transformed or undergo a change in its structure, due to the thermal process; also I know confirm the existence of others items as he aluminum, silicon, sodium, calcium, oxygen, among others.

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Section: X-ray Diffractionmentioning

confidence: 89%

Section: X-ray Diffractionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of calcination on the structure of a natural Mexican zeolite: Study by XRD and SEM-EDS

Viveros,

TIacuatl,

Ramírez

et al. 2023

JER

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“…The zeolitic mineral was extracted directly from the deposit of the town of Etla, in the state of Oaxaca, in Mexico; its origin is natural since it was not subjected to no physicochemical process to remove undesirable impurities; its composition is approximately 75% of the clinoptilolite crystalline phase, the rest of the material is made up of mordenite, erionite, quartz, feldspar, iron oxides [12].…”

Section: Methodsmentioning

confidence: 99%

X-ray diffraction and photocatalytic activity of natural Mexican clinoptilolite

Viveros¹,

Tlacuatl²,

Ramírez³

et al. 2023

JER

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We present the structural characterization of several sets of minerals: a) natural clinoptilolite (ZNM), b) ZNM subjected to grinding for three hours (ZNM025), c) ZNM025 calcined at 250 °C (ZNM250) and d) ZNM025 treated at 500 °C (ZNM500), X-ray diffraction (XRD) technique was used to determine what the changes were. On the other hand, the aforementioned samples were used to carry out the degradation of the Reactive Black 5 (RB5) textile dye, relying on a photocatalytic process. The effects of calcinations at 250 °C and 500°C on the materials, according to the diffraction patterns are: i) increase in the amorphous phase; ii) positive or negative shift (compared to ZNM025), of the diffraction peaks of ZNM250 and ZNM500; iii) decrease in particle size, according to the Debye-Scherrer model; iv) absence of diffraction peaks of Iron Oxide (FeOx) particles.In addition, we have found that the sample set can photocatalytically mineralize the RB5 dye. The degree of mineralization was verified through the decrease in the height of the absorption band of the UV-Vis spectrum (λ = 600 nm), which corresponds to the azo bond (-N=N-) of the chemical structure of the compound. organic (RB5). Finally, the following dye degradation order was established, ZNM025 < ZNM250 < ZNM500, indicating that the heat treatment at 500 °C of natural clinoptilolite improves the catalytic properties and allows for better RB5 degradation efficiencies.

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“…Extrusion has been established commercially to produce mechanically strong and attrition-resistant granules, pellets, and honeycomb structures of industrially important adsorbents and catalysts such as zeolites, MOFs, and porous carbon for adsorption, air separation, and catalytic applications. A schematic diagram of the extrusion process and examples of extruded bodies from zeolites are presented in Figure 18.9 [26,[60][61][62][63][64].…”

Section: Extrusionmentioning

confidence: 99%

Granulation and Shaping of Metal-Organic Frameworks

Lee

Valekar

Hwang

et al. 2016

The Chemistry of Metal-Organic Frameworks: Synthesis, Characterization, and Applications

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IntroductionShaping and forming of metal-organic frameworks (MOFs) are essential for practical applications like adsorption/separation and catalysis, which require structuring of the nano-/microcrystalline fine powders of MOFs into a macroscopic body [1][2][3][4][5][6][7]. When a process for catalysis or adsorptive separation is scaled up to the pilot or commercial scale, the form in which an active catalyst or adsorbent is used is decisive in determining the ultimate performance of the unit [8][9][10]. In this respect, the size and shape of the target material require a compromise between minimizing pore diffusion effects in the material particles, for which small particles are necessary, and minimizing the pressure drop across the reactor, which requires large particle sizes [11]. The shaped MOFs should maintain excellent performance shown by the original powder forms based on their high porosity, crystallinity, and flexibility [12]. Therefore, the proper selection of the shaping or forming process is important in the MOF research field for chemical engineering and industrial applications. As the shaping methods are often proprietary and often more of an art than a science, the exact procedures are rarely disclosed.The shaped MOFs can also be prepared using techniques (Figure 18.1) that have typically been utilized for synthesizing catalysts and adsorbents from porous materials, such as pressing, extrusion, granulation and spray drying, foaming, casting, and coating. Well-shaped bodies have been produced in the forms of pellets, tablets, monoliths, granules, and spheres [13][14][15][16]. However, to utilize shaped MOFs successfully for industrial applications, they should have sufficient mechanical strength, chemical stability, attrition resistance, maximal bulk density, and minimal wasted space in the storage vessel [17][18][19][20][21][22][23][24]. As the performance of shaped MOFs for industrial or large-scale applications depends on several parameters, including the mass-and heat-transfer properties, gas diffusion kinetics, pressure drop across material, mechanical strength, and volumetric efficiency, achieving high mechanical integrity of the structured MOF is critical to the performance in real engineering processes. The Chemistry of Metal-Organic Frameworks: Synthesis, Characterization, and Applications, First Edition. Edited by Stefan Kaskel.

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Electrochemical Characterization of Carbon Paste Electrodes Modified With Natural Zeolite

Cited by 6 publications

References 12 publications

Effect of calcination on the structure of a natural Mexican zeolite: Study by XRD and SEM-EDS

Effect of calcination on the structure of a natural Mexican zeolite: Study by XRD and SEM-EDS

X-ray diffraction and photocatalytic activity of natural Mexican clinoptilolite

Granulation and Shaping of Metal-Organic Frameworks

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