Tunable photocatalytic selectivity of TiO 2 /SiO 2 nanocomposites: Effect of silica and isolation approach

Pakdel, Esfandiar; Daoud, Walid A.; Seyedin, Shayan; Wang, Jinfeng; Razal, Joselito M.; Sun, Lu; Wang, Xungai

doi:10.1016/j.colsurfa.2018.04.070

Cited by 51 publications

(24 citation statements)

References 45 publications

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“…To solve this key problem, researchers have utilized a variety of effective methods to modify TiO 2 , including dye-sensitizing [ 5 ], noble metal loading [ 6 , 7 ], semiconductor mixing [ 8 , 9 , 10 ], and ion doping [ 11 , 12 , 13 ]. Among them, ion doping has been extensively reported as a promising modification method.…”

Section: Introductionmentioning

confidence: 99%

Boosted Visible-Light Photodegradation of Methylene Blue by V and Co Co-Doped TiO2

Lv¹,

Zhao²,

Chen³

et al. 2018

Materials

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In this work, TiO2 photocatalysts, co-doped with transition metal ions vanadium (V) and cobalt (Co) ((V,Co)–TiO2), were synthesized by the sol–gel method. The synthesized photocatalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), nitrogen adsorption and desorption measurement, UV-Vis absorption and photoluminescence spectrum (PL) spectra. The results show that V and Co co-doping has significant effects on sample average crystalline grain size, absorption spectrum, recombination efficiency of photo-induced electron-hole pairs (EHPs), and photocatalytic degradation efficiency of methylene blue (MB). (V,Co)–TiO2 photocatalyst exhibits an obvious red shift of the absorption edge to 475 nm. Photocatalytic degradation rate of (V,Co)–TiO2 sample for MB in 60 min is 92.12% under a Xe lamp with a cut-off filter (λ > 400 nm), which is significantly higher than 56.55% of P25 under the same conditions. The first principles calculation results show that V and Co ions doping introduces several impurity energy levels, which can modulate the location of the valence band and conduction band. An obvious lattice distortion is produced in the meantime, resulting in the decrease in photo-generated EHP recombination. Thus, (V,Co)–TiO2 photocatalyst performance is significantly improved.

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Section: Introductionmentioning

confidence: 99%

Boosted Visible-Light Photodegradation of Methylene Blue by V and Co Co-Doped TiO2

Lv¹,

Zhao²,

Chen³

et al. 2018

Materials

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“…Pakdel et al [157] reported that TiO 2 /SiO 2 nanocomposites have an increased S BET and smaller P d and P v by adding a small amount of silica in the composite. However, further increasing silica loading obtained lower S BET and larger P d and P v nanocomposites caused by the formation of larger aggregated particles and blockage of the mesoporous structures.…”

Section: Silicamentioning

confidence: 99%

Impact of Doping and Additive Applications on Photocatalyst Textural Properties in Removing Organic Pollutants: A Review

et al. 2021

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The effect of ion doping and the incorporation of additives on photocatalysts’ textural properties have been reviewed. Generally, it can be summarised that ion doping and additives have beneficial effects on photocatalytic efficiency and not all have an increase in the surface area. The excessive amount of dopants and additives will produce larger aggregated particles and also cover the mesoporous structures, thereby increasing the pore size (Pd) and pore volume (Pv). An excessive amount of dopants also leads to visible light shielding effects, thus influence photocatalytic performance. Ion doping also shows some increment in the surface areas, but it has been identified that synergistic effects of the surface area, porosity, and dopant amount contribute to the photocatalytic performance. It is therefore important to understand the effect of doping and the application of additives on the textural properties of photocatalysts, thus, their performance. This review will provide an insight into the development of photocatalyst with better performance for wastewater treatment applications.

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“…The type of obtained nanostructures that are composed of two materials are called core-shell nanostructures and can be divided into various categories according to their physicochemical properties-for example, core-shell nanoparticles, core-shell magnetics, core-shell silica nanoparticles, or core-shell polymer nanoparticles [15]. Taking into account recent scientific reports, the interest of scientists is focused primarily on silica-covered metal Materials 2021, 14, 4987 2 of 16 structures, the most frequently studied of which are Ag@SiO 2 [8,16,17], Au@SiO 2 [18][19][20], or TiO 2 @SiO 2 [21][22][23]. It is worth mentioning that core-shell nanomaterials are not only less cytotoxic but also show high dispersibility, biocompatibility, and improved thermal and chemical stability [7].…”

Section: Introductionmentioning

confidence: 99%

Characterization and Cytotoxicity Comparison of Silver- and Silica-Based Nanostructures

et al. 2021

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Core-shell structures are the most common type of composite material nanostructures due to their multifunctional properties. Silver nanoparticles show broad antimicrobial activity, but the safety of their utilization still remains an issue to tackle. In many applications, the silver core is coated with inorganic shell to reduce the metal toxicity. This article presents the synthesis of various materials based on silver and silica nanoparticles, including SiO2@Ag, Ag@SiO2, and sandwich nanostructures—Ag@SiO2@Ag—and the morphology of these nanomaterials based on transmission electron microscopy (TEM), UV-Vis spectroscopy, and FT-IR spectroscopy. Moreover, we conducted the angle measurements due to the strong relationship between the level of surface wettability and cell adhesion efficiency. The main aim of the study was to determine the cytotoxicity of the obtained materials against two types of human skin cells—keratinocytes (HaCaT) and fibroblasts (HDF). We found that among all the obtained structures, SiO2@Ag and Ag@SiO2 showed the lowest cell toxicity and very high half-maximal inhibitory concentration. Moreover, the measurements of the contact angle showed that Ag@SiO2 nanostructures were different from other materials due to their superhydrophilic nature. The novel approach presented here shows the promise of implementing core-shell type nanomaterials in skin-applied cosmetic or medical products.

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Tunable photocatalytic selectivity of TiO 2 /SiO 2 nanocomposites: Effect of silica and isolation approach

Cited by 51 publications

References 45 publications

Boosted Visible-Light Photodegradation of Methylene Blue by V and Co Co-Doped TiO2

Boosted Visible-Light Photodegradation of Methylene Blue by V and Co Co-Doped TiO2

Impact of Doping and Additive Applications on Photocatalyst Textural Properties in Removing Organic Pollutants: A Review

Characterization and Cytotoxicity Comparison of Silver- and Silica-Based Nanostructures

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