Formation of zinc oxide particles in cetyltrimethylammonium-smectites

Khumchoo, Nuttaporn; Khaorapapong, Nithima; Ogawa, Makoto

doi:10.1016/j.clay.2015.01.001

Cited by 22 publications

(18 citation statements)

References 52 publications

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“…After incorporation of the oxide into the clay structure, the average pore diameter decreased and the specific area decreased 49 , probably due to a significant decrease in the mesoporous area due to the introduction of the oxide and a slight increase in the amount of pore micropores in the region near 2 nm due to the TiO 2 formed. Figure 4 shows the thermogravimetric (TG) and derivative (DTG) curves, which show the mass loss events for sepiolite and TiO 2 /Sep nanocomposite during four different events 45 .…”

Section: Characterizationmentioning

confidence: 99%

TiO2 Immobilized on Fibrous Clay as Strategies to Photocatalytic Activity

et al. 2020

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TiO 2 immobilized in Sepiolite (TiO 2 /Sep) was successfully prepared by the sol-gel technique, with titanium isopropoxide as the precursor for the formation of TiO 2 in the anatase phase calcined at 400 °C. The prepared samples were characterized by X-ray diffraction, Fourier Transform Infrared spectroscopy, Scanning Electron Microscopy coupled to energy dispersive spectroscopy, and thermogravimetric analysis. The results showed that TiO 2 /Sep structure was identified in all characterizations, showing the specific peaks, bands, mass loss, and morphology after the impregnation process. Photocatalytic experiments were performed under UV irradiation with various photocatalyst concentrations and pH effects in the reaction. The prepared samples presented 72% photocatalytic efficiency for eosin (EA) dye discoloration after 150 min under UV light. This efficiency was attributed to the radicals generated from the TiO 2 and the high specific surface area, showing that TiO 2 /Sep is promising candidate in the degradation of organic pollutants.

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Section: Characterizationmentioning

confidence: 99%

TiO2 Immobilized on Fibrous Clay as Strategies to Photocatalytic Activity

et al. 2020

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“…It should be remembered that nanoparticulated zinc oxide is a wide-band gap II–VI semiconductor with a band-gap energy of around 3.4 eV, which is of great interest for photocatalytic applications [7]. ZnO nanoparticles (NP) have been assembled to microparticulated layered silicates of the smectite family, giving rise to materials exhibiting interesting properties [8–9]. The immobilization of those NP on clay surfaces represents an advantage for the easier recovering of the photocatalyst from the reaction medium compared to ZnO NP alone.…”

Section: Introductionmentioning

confidence: 99%

Organoclay hybrid materials as precursors of porous ZnO/silica-clay heterostructures for photocatalytic applications

Akkari¹,

Amara²,

Ruiz‐Hitzky³

2016

Beilstein J. Nanotechnol.

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In this study, ZnO/SiO2-clay heterostructures were successfully synthesized by a facile two-step process applied to two types of clays: montmorillonite layered silicate and sepiolite microfibrous clay mineral. In the first step, intermediate silica–organoclay hybrid heterostructures were prepared following a colloidal route based on the controlled hydrolysis of tetramethoxysilane in the presence of the starting organoclay. Later on, pre-formed ZnO nanoparticles (NP) dispersed in 2-propanol were incorporated under ultrasound irradiation to the silica–organoclay hybrid heterostructures dispersed in 2-propanol, and finally, the resulting solids were calcinated to eliminate the organic matter and to produce ZnO nanoparticles (NP) homogeneously assembled to the clay–SiO2 framework. In the case of montmorillonite the resulting materials were identified as delaminated clays of ZnO/SiO2-clay composition, whereas for sepiolite, the resulting heterostructure is constituted by the assembling of ZnO NP to the sepiolite–silica substrate only affecting the external surface of the clay. The structural and morphological features of the prepared heterostructures were characterized by diverse physico-chemical techniques (such as XRD, FTIR, TEM, FE-SEM). The efficiency of these new porous ZnO/SiO2-clay heterostructures as potential photocatalysts in the degradation of organic dyes and the removal of pharmaceutical drugs in water solution was tested using methylene blue and ibuprofen compounds, respectively, as model of pollutants.

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“…The preparation of ZnO nanoparticles in inorganic matrices results in controlled particle size and shape as well as surface accessibility due to interfacial interactions between the support and ZnO. Accordingly, inorganic nanomaterials such as mesoporous silicas, zeolites, carbon nanotubes, graphene, layered silicates, and layered double hydroxides have been used as supports for ZnO nanoparticles …”

Section: Introductionmentioning

confidence: 77%

“…Because the photoluminescence of ZnO was also affected by its quantity in the interlayer spaces of smectites, ZnO(1)–smectites and ZnO(12)–smectites (1 and 12 denote the relative amounts of added ZnCl 2 ; in experiments performed up to now, ZnO(3)–smectites were used) were also prepared by using different loadings of the ZnO precursors. However, the ZnO adsorbed in the ZnO(1)–smectites and ZnO(12)–smectites gave very low PL intensity due to the very low amount of ZnO incorporated into the ZnO(1)–smectites and the formation of microcrystalline ZnO on the external surfaces of the clay minerals of the ZnO(12)–smectites, similarly to the products reported in our previous work . They also showed very low surface areas that were not suitable for use as catalysts.…”

Section: Resultsmentioning

confidence: 99%

Efficient Photodegradation of Organics in Acidic Solution by ZnO–Smectite Hybrids

et al. 2016

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Zinc oxide has been immobilized in layered clay minerals (natural montmorillonite and synthetic saponite) by ion exchange and simultaneous oxidation. The products exhibit blueshifted absorption bands (onsets at 346 and 374 nm for the montmorillonite and saponite systems, respectively) compared with that of bulk zinc oxide (393 nm), thereby showing the formation of zinc oxide nanoparticles. The samples are characterized by the broad photoluminescence centered at 545 nm [a]

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Formation of zinc oxide particles in cetyltrimethylammonium-smectites

Cited by 22 publications

References 52 publications

TiO2 Immobilized on Fibrous Clay as Strategies to Photocatalytic Activity

TiO2 Immobilized on Fibrous Clay as Strategies to Photocatalytic Activity

Organoclay hybrid materials as precursors of porous ZnO/silica-clay heterostructures for photocatalytic applications

Efficient Photodegradation of Organics in Acidic Solution by ZnO–Smectite Hybrids

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