Influence of purification method of Na-montmorillonite on textural properties of clay mineral composites with TiO2 nanoparticles

Bahranowski, Krzysztof; Gaweł, Adam; Klimek, Agnieszka; Michalik-Zym, A.; Napruszewska, Bogna D.; Nattich-Rak, Małgorzata; Rogowska, M.; Serwicka, Ewa M.

doi:10.1016/j.clay.2017.01.032

Cited by 45 publications

(24 citation statements)

References 33 publications

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“…For example, TiO 2 can be deposited onto natural minerals to form bi-functional adsorption-photocatalyst composite materials. Therefore, composites such as kaolinite-TiO 2 , 19,20 montmorillonite-TiO 2 21,22 and zeolite-TiO 2 23,24 have been investigated intensively. The natural minerals not only served as supports, but also as adsorbents that can degrade the dye concentration in solution.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic degradation of methylene blue by UV‐assistant TiO₂ and natural sericite composites

Huang

2020

J of Chemical Tech & Biotech

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BACKGROUND In order to prepare an environmental‐friendly photocatalyst, natural mineral sericite is used as the substrate of photocatalysts. In this study, the TiO2‐sericite composite materials are synthesized by a facile sol‐gel process, followed via a calcination treatment that can improve the crystallinity of the nano‐sized TiO2. The prepared composites are characterized by XRD, Raman, FTIR, UV‐vis, SEM, and BETanalysis. The effects of the molecular ratio of TiO2 to sericite and the calcination temperature are also examined. RESULTS Sericite is not only served as a substrate for nano‐sized TiO2 to fabricate the micro‐sized composite materials but also affect the formation of different crystalliniteTiO2. The characteristic results show that the addition of sericite can stabilize the crystal phase of TiO2; therefore, the sericite can maintain the crystalline anatase of TiO2 even after the calcination at 700 °C and 900 °C. Accordingly, the adsorption test and the photocatalytic degradation of methylene blue are conducted to verify the photocatalytic performance of the TiO2‐sericite composite materials. It indicates that the synergetic effect of TiO2‐sericite composites can facilitate the photocatalytic degradation of TiO2 accompanied by the initial adsorption of methylene blue by sericite. Based on the presence of various radicals, including ·OH, ·O2−, and 1O2, the mechanism of photocatalytic degradation of methylene blue via TiO2‐sericite composites are successfully proposed. CONCLUSION The excellent activity reveals that TiO2‐sericite composites are with potential employed as ecological‐friendly photocatalysts in the degradation of pollutants. © 2020 Society of Chemical Industry

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Section: Introductionmentioning

confidence: 99%

Photocatalytic degradation of methylene blue by UV‐assistant TiO₂ and natural sericite composites

Huang

2020

J of Chemical Tech & Biotech

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“…N 2 physisorption was used to investigate the textural properties of the samples resulting from tin insertion and acid‐treatment (Figure a, Table S1, Supporting Information). It is important to note that N 2 does not penetrate the interlayer space of unmodified MMT . All clays possessed a type II isotherm with an H2 hysteresis loop closing vertically at p/p 0 of 0.44, which is typical for clay.…”

Section: Resultsmentioning

confidence: 95%

“…It is important to note that N 2 does not penetrate the interlayer space of unmodified MMT. [34] All clays possessed a type II isotherm with an H2 hysteresis loop closing vertically at p/p 0 of 0.44, which is typical for clay. Acid-treatment and insertion of tin increased the specific surface area from 69 to 119 and 269 m 2 g À 1 , respectively (Table S1).…”

Section: Structure and Morphology Of Na-mmt At-mmt And Sn-mmtmentioning

confidence: 91%

Insights into the Nature of the Active Sites of Tin‐Montmorillonite for the Synthesis of Polyoxymethylene Dimethyl Ethers (OME)

et al. 2019

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In this study, we report that intercalation of tin into montmorillonite clay (Sn‐MMT) boosts catalytic activity for the synthesis of polyoxymethylene dimethyl ethers, a promising diesel fuel additive. This increase in activity is attributed to the formation of a hierarchical catalyst displaying high surface area with accessible Brønsted and Lewis acid sites. Extensive characterization such as MAS‐NMR, XRD and in‐situ DRIFTS confirmed that tin insertion induced reorganization of the clay layers into a disorganized house‐of‐cards structure. It also revealed that tin resided between the clay layers as defective SnO2 nanocrystals stabilized by the negative charge of MMT. The source of acidity in Sn‐MMT was studied by comparing it with two similar materials, namely Sn(OH)4, and thermally treated Sn‐MMT. Low activity measured for isolated hydroxylated SnO2 nanoparticles illustrates the importance of having clay and tin in close proximity. Meanwhile, deactivation upon thermal treatment occurred via sintering of the tin phase and diffusion of the protons inside the layers. Sn‐MMT acidity is attributed to the combination of Si−OH−Al groups, formed as a by‐product of SnO2 crystallization, and undercoordinated Sn surface sites, stabilized by the negative charge of MMT.

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“…S3). This also can be noticed by the higher surface area of the K10 montmorillonite clay (221 m 2 /g ( Table 1)) compared with untreated montmorillonite clay (∼20-40 m 2 /g (Sigma-Aldrich)) in which the interlayer space is not reachable for N 2 molecules [57]. Nevertheless, the two-dimensional lattice of the clay was preserved through the acid treatment, which was confirmed by XRD peaks at 19.8°, 34.9°, and 61.8°assigned to the hk0 indices of (020,110), (200,130), and (060,330), respectively [58][59][60].…”

Section: Effect Of Thermal Treatment On Catalyst Structurementioning

confidence: 88%

Selective synthesis of dimethyl ether on eco-friendly K10 montmorillonite clay

Bahmanpour

Héroguel

Baranowski

et al. 2018

Applied Catalysis A: General

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The methanol dehydration reaction was studied over environmentally benign, easily accessible and inexpensive K10 montmorillonite clay used as the catalyst at a temperature range between 200-700°C. Nearly 100% selectivity towards dimethyl ether (DME) at 80% methanol conversion was observed at 300°C. However, upon heating, the selectivity shifted and the catalyst produced formaldehyde as well as an almost 1:1 M ratio of methane and carbon monoxide at 700°C. Calcination at 300°C increased the catalyst acidity due to desorption of chemisorbed water, thereby enhancing the methanol conversion to form DME. Higher calcination temperatures negatively affected the catalyst structure and, therefore, its activity. Catalyst characterization by means of X-ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS), and solid-state Nuclear Magnetic Resonance (MAS NMR) spectroscopy, revealed that the calcination temperature affected the near surface Si/Al ratio as well as the surface hydroxyl groups. It was concluded that the density of the surface Brønsted acid sites is directly proportional to methanol conversion to DME.

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Influence of purification method of Na-montmorillonite on textural properties of clay mineral composites with TiO2 nanoparticles

Cited by 45 publications

References 33 publications

Photocatalytic degradation of methylene blue by UV‐assistant TiO₂ and natural sericite composites

Photocatalytic degradation of methylene blue by UV‐assistant TiO₂ and natural sericite composites

Insights into the Nature of the Active Sites of Tin‐Montmorillonite for the Synthesis of Polyoxymethylene Dimethyl Ethers (OME)

Selective synthesis of dimethyl ether on eco-friendly K10 montmorillonite clay

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Influence of purification method of Na-montmorillonite on textural properties of clay mineral composites with TiO2 nanoparticles

Cited by 45 publications

References 33 publications

Photocatalytic degradation of methylene blue by UV‐assistant TiO2 and natural sericite composites

Photocatalytic degradation of methylene blue by UV‐assistant TiO2 and natural sericite composites

Insights into the Nature of the Active Sites of Tin‐Montmorillonite for the Synthesis of Polyoxymethylene Dimethyl Ethers (OME)

Selective synthesis of dimethyl ether on eco-friendly K10 montmorillonite clay

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Product

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Photocatalytic degradation of methylene blue by UV‐assistant TiO₂ and natural sericite composites

Photocatalytic degradation of methylene blue by UV‐assistant TiO₂ and natural sericite composites