One-pot hydrothermal synthesis of zeolite/sodium tantalate composite and its photodegradation of methyl orange

Gu, Xiaofeng; Lu, Haiquan; Kan, Chun; Yao, Jianfeng

doi:10.1016/j.materresbull.2015.03.046

Cited by 9 publications

(6 citation statements)

References 25 publications

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“…This frequency dependency of dielectric constant is known as dielectric dispersion. 37 Such behavior can be explained by the dipole relaxation phenomenon. At low frequencies, the space charges have an adequate amount of time to follow the frequency of the applied field and undergo the relaxation process, whereas at higher frequencies, these space charges are not able to undergo the relaxation process.…”

Section: Resultsmentioning

confidence: 99%

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High-Surface-Area Sodium Tantalate Nanoparticles with Enhanced Photocatalytic and Electrical Properties Prepared through Polymeric Citrate Precursor Route

et al. 2019

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NaTaO3 nanoparticles with a high surface area of 46.2 m2/g have been successfully synthesized using a polymeric citrate precursor route. As-prepared nanoparticles were extensively characterized by X-ray diffraction, Fourier transform infrared, transmission emission microscopy, and scanning electron microscopy studies for the analysis of phase purity, crystallinity, and morphology. NaTaO3 nanoparticles show efficient photo-induced removal of the methylene blue dye under sunlight, which were confirmed by using liquid chromatography–mass spectroscopy. 86% dye has been degraded in 200 min at neutral pH, whereas the same amount of dye was decolorized in only 80 min at alkaline pH. Also, the dielectric behavior of the as-prepared nanoparticles at different annealing temperatures was explained by the Maxwell–Wagner polarization mechanism. At 500, 600, and 700 °C annealing temperatures, the dielectric constant and dielectric loss at 500 kHz for the samples were found to be 21.5, 18, and 16 and 0.012, 0.022, and 0.029, respectively. The unsaturated hysteresis loop shows weak ferroelectric behavior of NaTaO3 nanoparticles with remanent and saturation polarizations of 0.0013 and 0.21 μC/cm2, respectively, and S-E hysteresis shows a bipolar strain of 0.10%.

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Section: Resultsmentioning

confidence: 99%

“…It could be seen that at lower frequency, the sample annealed at 500, 600, and 700 °C shows a nonlinear decrease in dielectric constant with frequency at 100 °C. This frequency dependency of dielectric constant is known as dielectric dispersion . Such behavior can be explained by the dipole relaxation phenomenon.…”

Section: Resultsmentioning

confidence: 99%

High-Surface-Area Sodium Tantalate Nanoparticles with Enhanced Photocatalytic and Electrical Properties Prepared through Polymeric Citrate Precursor Route

et al. 2019

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“…However this propensity for phase transition is detrimental to the enhancement of these materials' functionality. For example, efforts to enhance the photocatalytic property of tungstates [1][2][3][4], tantalates [5][6][7][8], vanadates [9][10][11][12][13], and titanates [14][15][16][17][18][19][20] are shown to be limited by the vulnerability of transition prone crystalline phases. Evidently, the slightest phase gradient such as a single intrinsic defect can have significant effects on the functionality of a material because it only takes one to be a charge trap that significantly increases the recombination rates.…”

Section: Introductionmentioning

confidence: 99%

Free energy landscape approach to aid pure phase synthesis of transition metal (X=Cr, Mn and Fe) doped bismuth titanate (Bi2Ti2O7)

Mayfield

Huda

2016

Journal of Crystal Growth

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A density functional theory study of Cr, Mn and Fe substitutions in Bi 2 Ti 2 O 7 (BTO) photocatalysts is presented. We performed a stability analysis from our total energy calculations and have determined formations of dopant inspired phases are detrimental to the overall photocatalytic performance of X-doped BTO. From our calculated formation energies and electronic structures it is shown that X substitution of Ti is least stable and should be associated with formation of secondary phases more so than X substitution of Bi. This result contradicts the many experimental studies which suggest transition metal dopants always substitute Ti in BTO, but on the other hand, explains the poor photocatalytic response beyond what has become known as the critical dopant concentration.

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“…Particularmente resultan interesantes, las zeolitas de poro grande Y con área superficial entre 500-600m 2 /g. Esta conjunción de red eléctricamente cargada, elevada área superficial, conformación estructural de poros y canales bien definidos y estables, las hacen altamente atractivas como materiales catalíticos (Xu, 2006) o bien, para su empleo como soportes de especies activas (Saux, 2016, Gu, 2015. Se ha reportado el empleo de zeolitas como catalizadores para la oxidación de numerosos derivados de biomasa (Perego, 2011).…”

Section: Introductionunclassified

Desarrollo de materiales catalíticos y su aplicación en la revalorización de moléculas plataforma derivadas de biomasa

Ortenzi

Marchena²,

Pierella³

2020

AJEA

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En este trabajo se presentará un resumen del plan de tesis doctoral que consiste en el desarrollo de materiales catalíticos basados en metales de transición y metales nobles impregnados sobre sólidos de elevada área superficial y diferentes propiedades físico-químicas, para ser aplicados en reacciones de valorización de moléculas plataforma derivadas de biomasa. Particularmente, se incorporarán metales de transición (Fe, Co, Cu, entre otros) y metales nobles (Pd, Pt y/o Rh) sobre estructuras organometálicas (MOF-5 y MIL-101), zeolitas comerciales (Y) y alúmina nanotubular (Al2O3). Se evaluarán las propiedades catalíticas de los materiales en reacciones de oxidación de moléculas orgánicas derivadas de la biomasa de la familia de los furanos y compuestos aromáticos (2-furaldehido, 5-hidroximetil-2- furaldehido, tolueno), en condiciones suaves o medias que generan un impacto ambiental reducido.

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One-pot hydrothermal synthesis of zeolite/sodium tantalate composite and its photodegradation of methyl orange

Cited by 9 publications

References 25 publications

High-Surface-Area Sodium Tantalate Nanoparticles with Enhanced Photocatalytic and Electrical Properties Prepared through Polymeric Citrate Precursor Route

High-Surface-Area Sodium Tantalate Nanoparticles with Enhanced Photocatalytic and Electrical Properties Prepared through Polymeric Citrate Precursor Route

Free energy landscape approach to aid pure phase synthesis of transition metal (X=Cr, Mn and Fe) doped bismuth titanate (Bi2Ti2O7)

Desarrollo de materiales catalíticos y su aplicación en la revalorización de moléculas plataforma derivadas de biomasa

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