The photocatalytic activity of ZnO prepared by simple thermal decomposition method at various temperatures

Saravanan, R.; Thirumal, E.; Gupta, Vinod Kumar; Narayanan, V.; Stephen, A.

doi:10.1016/j.molliq.2012.10.018

Cited by 467 publications

(111 citation statements)

References 53 publications

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“…Figure 3 shows the morphological changes of the ZnAl-LDH/TiO 2 powders along with the increase of the TiO 2 content of the mono modal powder samples, B1 and B2. In the case of both powders, it is evident that the typical morphology for the LDHs, agglomerates of the flat particles named "desert rose", were identified (24)(25)(26). The spherical TiO 2 particles in the form of agglomerates most frequently preferably appear on the LDH particles' edges (27) of the "desert rose".…”

Section: Phase Composition Of the Impregnated Znal-ldh/tiomentioning

confidence: 94%

“…It can be concluded that the increase in the quantity of the impregnated TiO 2 to 10wt.% does not inhibit the memory effect of the calcinated active carrier. On the contrary, it has a positive effect on the crystallinity and on stability of the ZnO and Zn 2 TiO 4 , which is important for the upcoming photocatalytical reactions (24). The lower crystallinity of the TiO 2 , ZnO and Zn 2 TiO 4 in the case of the powders A1 and A2 could be responsible for their lower photocatalytic activity.…”

Section: Phase Composition Of the Impregnated Znal-ldh/tiomentioning

confidence: 99%

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Synthesis of nanocomposite coating based on TiO<sub>2</sub>/ZnAl layer double hydroxides

et al. 2017

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ABSTRACT:The aim of this investigation was the synthesis of nanocomposite coatings based on Zn-Al layered double hydroxides (Zn-Al LDH) and TiO 2 . The Zn-Al LDH material, which acted as the catalyst support of the active TiO 2 component (in the content of 3 and 10 wt. %), was synthesized by a low super saturation co-precipitation method. The interaction between the Zn-Al LDH and the active TiO 2 component was accomplished by using vacuum evaporation prior to the mechanical activation and only by mechanical activation. The final suspension based on Zn-Al LDH and 10wt. % TiO 2 , impregnated only by mechanical activation, showed the optimal characteristics from the aspect of particle size distribution and XRD analysis. These properties had a positive effect on the functional properties of the coatings (photocatalytic activity and self-cleaning efficiency) after the water rinsing procedure. KEYWORDS: RESUMEN: Síntesis de un revestimiento nanocompuesto basado en TiO 2 / ZnAl hidróxidos dobles en capas.El objetivo de esta investigación fue la preparación de recubrimientos de nanocompuestos basados en Zn-Al hidróxidos dobles en capas (Zn-Al LDH) y TiO 2 . El material de LDH Zn-Al, que actuaba como catalizador del componente activo TiO 2 (en el contenido de 3 y 10 en peso.%), se sintetizó por un método de co-precipitación con baja sobresaturación. La interacción entre el Zn-Al LDH y el componente activo TiO 2 se llevó a cabo mediante el uso de la evaporación al vacío antes de la activación mecánica y sólo por activación mecánica. La suspensión final basada en Zn-Al LDH y 10wt. % TiO 2 , impregnada solamente por la activación mecánica, mostró las características óptimas desde el aspecto de la distribución de tamaño de partícula y análisis de XRD. Estas propiedades tenían un efecto positivo sobre las propiedades funcionales de los revestimientos (actividad fotocatalítica y eficiencia de auto-limpieza) después del procedimiento de aclarado de agua.ORCID ID: V. Jovanov

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Section: Phase Composition Of the Impregnated Znal-ldh/tiomentioning

confidence: 94%

Section: Phase Composition Of the Impregnated Znal-ldh/tiomentioning

confidence: 99%

Synthesis of nanocomposite coating based on TiO<sub>2</sub>/ZnAl layer double hydroxides

et al. 2017

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“…The thermal decomposition of zinc acetate dihydrate was investigated in detail previously [23][24][25][26][27][28]. It was found that the zinc acetate dihydrate decomposed in two steps, below 100 °C the adsorbed water evolved, then between 150-300 °C the anhydrous zinc acetate decomposed, resulting in ZnO.…”

Section: Figmentioning

confidence: 99%

Thermal study on the synthesis of the doped ZnO to be used in TCO films

Mihaiu

Szilágyi

Atkinson

et al. 2015

J Therm Anal Calorim

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ZnO, Li doped and Li,Ni co-doped ZnO powders to be later used as transparent conductive oxide (TCO) thin film were prepared by heat treatment of gels obtained from alcoholic Zn(CH 3 COO) 2 •2H 2 O, LiNO 3 •nH 2 O and NiSO 4 •6H 2 O solutions with (CH 3 CH 2 OH) 3 N as chelating agent. The properties of the powders and their thermal treatment were studied by thermogravimetric and termodifferential anlysis (TG/DTA), differential scanning calorimetry (DSC), evolved gas analysis coupled with mass spectroscopy (EGA-MS), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and scanning electron microscopy coupled with energy dispersive X-ray (SEM/ EDX). The as-prepared gels consisted of submicron platelet-like particles and contained zinc acetate dihydrate and hydrozincite in different amount and with different preferred orientations. During annealing the gels, zinc-acetate decomposed between 110-350 °C with the release of CH 3 COOH, acetone and CO 2 . The N content of the chelating agent was responsible for NH 3 and NO evolution. The thermal behavior of the doped 3 gels was similar, but there were also differences in the mass losses, amount of released gases.Based on TG/DTA data, ZnO powders were obtained from the gels by annealing both at 275 and 500 °C. After heating at 275 °C, the obtained powders consisted of spherical 1-2 micron grains of wurtzite. The inclusion of the dopants was successful according to EDX and cell parameter data. Thermal study of the powder annealed at 275 °C confirmed that they still contain some zinc acetate. In the case of the doped samples the mass loss was smaller, since the Li and Ni dopants catalized the composition of zinc acetate during the previous annealing at 275 °C. After annealing the gels at 500 °C, stable un-doped ZnO or doped ZnO particles were obtained.

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“…The techniques used for pollutant removal from wastewater include photodegradation [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] , adsorption 24,[26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45] , electrocoagulation 46,47 , membrane filtration 48,49 , and reverse osmosis 48 . Among these methods, sorption has proved to be an attractive process because of its low cost and ease of operation.…”

Section: Introductionmentioning

confidence: 99%

Effective Removal of Hexavalent Chromium from Aqueous Solutions Using Ionic Liquid Modified Graphene Oxide Sorbent

Nasrollahpour¹

2017

Chem.Biochem.Eng.Q.

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Ionic liquid modified reduced graphene oxide (IL-rGO) was prepared and examined for chromate removal. The sorbent was characterized by N 2 adsorption-desorption measurement (BET), transmission electron microscopy (TEM), powder X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) analysis. The sorption behavior of chromate on the ionic liquid modified reduced graphene oxide sorbent from an aqueous medium was studied by varying the parameters such as contact time, initial chromate concentration, pH, and agitation speed. The results showed that sorption kinetics of chromate by IL-rGO follows the pseudo second order, which indicates that the sorption mechanism is both chemical and physical interaction. The sorption isotherm studies revealed that Langmuir model provided the best fit to all the experimental data with an adsorption capacity of 232.55 mg g -1 for IL-rGO. Thermodynamic parameters, such as Gibbs free energy (-2.85 kJ mol -1 at 298 K), enthalpy (55.41 kJ mol -1 ), and entropy (11.64 J mol -1 K -1 ) of sorption of the chromate on ionic liquid modified reduced graphene oxide was evaluated, and it was found that the reaction was spontaneous and endothermic in nature.

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The photocatalytic activity of ZnO prepared by simple thermal decomposition method at various temperatures

Cited by 467 publications

References 53 publications

Synthesis of nanocomposite coating based on TiO<sub>2</sub>/ZnAl layer double hydroxides

Synthesis of nanocomposite coating based on TiO<sub>2</sub>/ZnAl layer double hydroxides

Thermal study on the synthesis of the doped ZnO to be used in TCO films

Effective Removal of Hexavalent Chromium from Aqueous Solutions Using Ionic Liquid Modified Graphene Oxide Sorbent

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