Synthesis and characterization of TiO2@SiO2–Ag nanocomposites towards photocatalytic degradation of rhodamine B and methylene blue

Govindhan, P.; Pragathiswaran, C.

doi:10.1007/s10854-016-4902-x

Cited by 26 publications

(9 citation statements)

References 39 publications

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“…The Raman peaks at 131, 274, 640 and 1000 cm ‐1 are the characteristics of Nb 2 O 5 as evident from Figure (b). The sharp peak around 1000 cm −1 could be assigned to the stretching vibrations of terminal Nb=O bond, which is in agreement with the previously reported results . The Raman peak around 131 cm −1 corresponds to the vibration of the overall octahedron and it matches well with the previuosly reported results .…”

Section: Resultssupporting

confidence: 92%

“…As can be seen in the Figure (B), there is small shift in the diffraction towards higher Bragg's angle when niobium content is higher. This shift in the diffraction peak could be attributed to the slight difference in size of Nb 5+ (0.74 Å) and Ti 4+ (0.605 Å) . As the size of the Ti 4+ is less, some of the Nb 5+ could be substituted in the lattice.…”

Section: Resultsmentioning

confidence: 98%

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Silver Nanocluster Anchored TiO₂/Nb₂O₅ Hybrid Nanocomposite as Highly Efficient and Selective Visible‐Light Sensitive Photocatalyst

2019

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It is of great interest to find a suitable modification of noble metal nanocluster (NC) with an aim to get a profound change in physical and chemical properties. In the present study, a new class of hybrid nanomaterials were successfully synthesized by anchoring Ag nanocluster with TiO 2 /Nb 2 O 5 nanocomposite. Two synthetic strategies have been carried out to prepare these. Two steps synthetic strategy was found to efficiently decorate TiO 2 /Nb 2 O 5 with silver nanocluster whereas one step synthesis produced Ag/TiO 2 nanocluster with negligible Nb 2 O 5 content. The as-prepared materials were characterized by HRTEM, EDAX, FTIR, Raman and XRD. Visible light photo-catalytic activities of the as-synthesized hybrid nanomaterials were investigated for the degradation of some of the potentially hazardous organic dyes (Malachite green and Methyl orange). We observed much greater photocatalytic activity of the nanocomposite for the degradation of Malachite green when silver nanocluster is anchored to the TiO 2 /Nb 2 O 5 as compared to the same materials with negligible Nb 2 O 5 content. Such observations indicate that the loading of Nb 2 O 5 in hybrid nanocomposite allowed the selective enhancement of the photocatalytic degradation of Malachite green.[a] Dr.

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 98%

Silver Nanocluster Anchored TiO₂/Nb₂O₅ Hybrid Nanocomposite as Highly Efficient and Selective Visible‐Light Sensitive Photocatalyst

2019

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“…Chemical routes, such as sol-gel techniques, possess the advantage of low cost with respect to physical synthesis methods [8]. In order to explore electronic and electrical applications of TiO 2 , its modification was performed by addition of polymers [9][10][11][12], doping with noble metals [13], and other metal oxidebased semiconductors [13][14][15][16][17][18][19]. Various composites formed by TiO 2 and other inorganic oxides such as ZnO, SnO 2 SiO 2 , In 2 O 3 , Cu 2 O, MgO, WO 3 , MoO 3 , etc.…”

Section: Introductionmentioning

confidence: 99%

Structural and optical studies of TiO₂:Ag₂O nanocomposite by sol-gel method

Koutu

Dhakar

Ojha

et al. 2020

Materials Science-Poland

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As TiO2 is suitable for electronic and electrical applications, in the present work the authors have successfully modified TiO2 by adding silver (Ag) to form titanium oxide-silver oxide (TiO2:Ag2O) nanocomposite samples by using sol-gel technique. Characterizations of these composites have been performed using X-ray diffraction (XRD), atomic force microscopy (AFM), scanning electron microscopy (SEM) and UV-Vis spectroscopy. XRD study revealed that the crystal structure of the samples consisted of tetragonal and cubic phases. This study further showed an increment in the average crystallite size from 8 nm to 38 nm with an increase in Ag concentration. The increase in crystallite size has been confirmed additionally by SEM and AFM. The increment in the average particle size of the samples may be attributed to an increase in silver molarity in the TiO2 matrix. Significant red shift in the absorption edge has been observed, causing reduction in the energy bandgap of the composites from 3.89 eV to 3.46 eV with an increase in particle size which is evident from UV-Vis spectroscopic studies. This wide-band gap properties of the TiO2:Ag2O nanocomposite make it suitable for memory-storage devices and dielectric applications.

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“…Some semiconductor particles will yield electron‐hole pairs when irradiated by specific wavelengths . Most organic substances, including dyestuff, red wine and coffee , react with these active species generating carbon dioxide and water. However, the safety of nanoparticles has attracted considerable attention .…”

Section: Introductionmentioning

confidence: 99%

“…Because of its narrow photo response range and inefficient utilisation of solar radiation, numerous methods have been proposed to improve the photocatalytic performance of titanium dioxide including doping with metal (silver, iron, zinc, gold, platinum) [21,[27][28][29][30] or non-metals (sulphur, nitrogen) [31,32], compounding with different semiconductors (antimony oxide, zinc oxide) [29,33], and sensitising with dyestuff [34], quantum dots (cadmium selenide, lead sulphide) [35,36] or graphene [11].…”

Section: Introductionmentioning

confidence: 99%

Microwave‐assisted preparation of pyrite and its sensitisation of titanium dioxide in self‐cleaning aramid fabrics

Zheng

Zhou

et al. 2018

Coloration Technology

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Titanium dioxide (TiO2) dispersions were obtained by neutralising anatase nano‐titanium dioxide sols prepared by hydrolysing tetrabutyl titanate in acidic aqueous media. Pyrite was initially prepared via the microwave‐assisted method with a mixed solvent of ethylene glycol and small amounts of water, and was then used in sensitising micron‐sized titanium dioxide particles to obtain aramid fabrics with self‐cleaning properties. X‐ray diffraction demonstrated the crystalline structure of pyrite, and ultraviolet‐visible (UV‐vis) spectrum and energy‐dispersive X‐ray spectroscopy characterised the band gaps, surface status on fabrics and the distribution of the pyrite compound's titanium dioxide particles. The contact angle, UV protection factor (UPF) and photocatalytic degradation of methylene blue (MB) were used to evaluate the performance of treated aramid fabrics. Results show that pyrite‐sensitised titanium dioxide compounds obtained at pH 5 have smaller band gap energies and relatively poor wetting abilities, higher UPF values, and perform well in the photocatalytic degradation of MB. The pseudo‐first kinetic model was used to analyse elaborate sections of the curve for the degradation of MB.

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Synthesis and characterization of TiO2@SiO2–Ag nanocomposites towards photocatalytic degradation of rhodamine B and methylene blue

Cited by 26 publications

References 39 publications

Silver Nanocluster Anchored TiO₂/Nb₂O₅ Hybrid Nanocomposite as Highly Efficient and Selective Visible‐Light Sensitive Photocatalyst

Silver Nanocluster Anchored TiO₂/Nb₂O₅ Hybrid Nanocomposite as Highly Efficient and Selective Visible‐Light Sensitive Photocatalyst

Structural and optical studies of TiO₂:Ag₂O nanocomposite by sol-gel method

Microwave‐assisted preparation of pyrite and its sensitisation of titanium dioxide in self‐cleaning aramid fabrics

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Synthesis and characterization of TiO2@SiO2–Ag nanocomposites towards photocatalytic degradation of rhodamine B and methylene blue

Cited by 26 publications

References 39 publications

Silver Nanocluster Anchored TiO2/Nb2O5 Hybrid Nanocomposite as Highly Efficient and Selective Visible‐Light Sensitive Photocatalyst

Silver Nanocluster Anchored TiO2/Nb2O5 Hybrid Nanocomposite as Highly Efficient and Selective Visible‐Light Sensitive Photocatalyst

Structural and optical studies of TiO2:Ag2O nanocomposite by sol-gel method

Microwave‐assisted preparation of pyrite and its sensitisation of titanium dioxide in self‐cleaning aramid fabrics

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Product

Resources

About

Silver Nanocluster Anchored TiO₂/Nb₂O₅ Hybrid Nanocomposite as Highly Efficient and Selective Visible‐Light Sensitive Photocatalyst

Silver Nanocluster Anchored TiO₂/Nb₂O₅ Hybrid Nanocomposite as Highly Efficient and Selective Visible‐Light Sensitive Photocatalyst

Structural and optical studies of TiO₂:Ag₂O nanocomposite by sol-gel method