Facile synthesis of porous TiO2 nanospheres and their photocatalytic properties

Huang, Jiarui; Ren, Haibo; Liu, Xiaosi; Li, Xuexue; Shim, Jae‐Jin

doi:10.1016/j.spmi.2015.01.012

Cited by 23 publications

(11 citation statements)

References 55 publications

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“…In order to rectify this problem, a variety of processes have been adopted to remove pollutants from wastewater, including adsorption [3], oxidation [4], reduction, and flocculation [5]. Among these various methods, photocatalysis has shown good potential for the removal of organic pollutants [6,7,8]. It has been reported that a number of semiconductors can be used to degrade a variety of organic pollutants using irradiation of light with different wavelengths [9,10].…”

Section: Introductionmentioning

confidence: 99%

Degradation of Methylene Blue Dye in the Presence of Visible Light Using SiO2@α-Fe2O3 Nanocomposites Deposited on SnS2 Flowers

et al. 2018

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Semiconductor materials have been shown to have good photocatalytic behavior and can be utilized for the photodegradation of organic pollutants. In this work, three-dimensional flower-like SnS2 (tin sulfide) was synthesized by a facile hydrothermal method. Core-shell structured SiO2@α-Fe2O3 nanocomposites were then deposited on the top of the SnS2 flowers. The as-synthesized nanocomposites were characterized by X-ray diffraction (XRD), Raman spectroscopy, field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV–Vis Spectroscopy, Brunauer–Emmett–Teller (BET) surface area analysis, and photoluminescence (PL) spectroscopy. The photocatalytic behavior of the SnS2-SiO2@α-Fe2O3 nanocomposites was investigated by observing the degradation of methylene blue (MB). The results show an effective enhancement of photocatalytic activity for the degradation of MB especially for the 15 wt % SiO2@α-Fe2O3 nanocomposites on SnS2 flowers.

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Section: Introductionmentioning

confidence: 99%

Degradation of Methylene Blue Dye in the Presence of Visible Light Using SiO2@α-Fe2O3 Nanocomposites Deposited on SnS2 Flowers

et al. 2018

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“…In order to avoid this issue, a variety of processes have been adopted to remove pollutants from wastewater, including adsorption [3], oxidation [4], reduction, and flocculation [5]. Among these various methods, photocatalysis and green technology have shown good potential for the removal of organic pollutants [6][7][8]. It has been reported that a number of semiconductors can be used to degrade a variety of organic pollutants under the irradiation of light with different wavelengths [9,10].…”

Section: Introductionmentioning

confidence: 99%

Degradation of Methylene Blue Dye in the Presence of Visible Light Using SiO2@α-Fe2O3 Nanocomposites Deposited on SnS2 Flowers

Balu

Uma

Pan

et al. 2018

Preprint

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Semiconductor materials have been shown to have better photocatalytic behavior and can be utilized for the photodegradation of organic pollutants. In this work, three-dimensional flower-like SnS2 were synthesized by a facile hydrothermal method. Core-shell structured SiO2@α-Fe2O3 nanocomposites were then deposited on the top of the SnS2 flowers. The as-synthesized nanocomposites were characterized by X-ray diffraction (XRD), Raman spectroscopy, field emission scanning electron microscopy (FE-SEM), Brunauer-Emmett-Teller (BET) and photoluminescence spectroscopy (PL). The photocatalytic behavior of the SnS2-SiO2@α-Fe2O3 nanocomposites was observed by observing the degradation of methylene blue (MB). The results show an effective enhancement of photocatalytic activity for the degradation of MB especially for the 15 wt. % SiO2@α-Fe2O3 nanocomposites on SnS2 flowers.

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“…Specifically, in the case of brown TiO 2– x , morphology would play an important role in the high rate of photocatalytic activity in addition to all the aforementioned qualities of the catalyst. The porous flower-like structure, having positive surface charge, led to the diffusion of a large number of organic molecules, specifically the oppositely (negatively) charged dye molecules MO, to be attached on the catalyst surface; also, a number of catalytic adsorption/desorption sites are available for photocatalysis . This could contribute positively toward a faster reaction, in addition to the advantages attributed to excess oxygen vacancy richness.…”

Section: Resultsmentioning

confidence: 99%

“…The porous flower-like structure, having positive surface charge, led to the diffusion of a large number of organic molecules, specifically the oppositely (negatively) charged dye molecules MO, to be attached on the catalyst surface; also, a number of catalytic adsorption/ desorption sites are available for photocatalysis. 55 This could contribute positively toward a faster reaction, in addition to the advantages attributed to excess oxygen vacancy richness. Photolysis of the dye mixture in the absence of any catalyst has also been done, and it has been noted that no noticeable degradation occurred (Figure S2).…”

Section: Acs Applied Nano Materialsmentioning

confidence: 99%

Defect-Rich Brown TiO_2–x Porous Flower Aggregates: Selective Photocatalytic Reversibility for Organic Dye Degradation

Ullattil

Ramakrishnan

2018

ACS Appl. Nano Mater.

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A low-temperature, Mn(II)-assisted sol-solvothermal strategy has been developed for the synthesis of positively surface-charged defective brown TiO 2−x flower aggregates with porous nature. The porous structure possessed enormous surface defect states such as trivalent titanium ion (Ti 3+ ) and oxygen vacancy (V o ) sites. The defect states present in the brown TiO 2−x facilitated enhanced absorption even in the NIR region of the solar spectrum, whereas for the negatively surface-charged TiO 2 sample, synthesized in the absence of Mn(II), the absorption was limited to the visible region. Obviously, band-gap narrowing occurred for brown TiO 2−x as compared to the yellow TiO 2 synthesized in the absence of Mn(II). Interestingly, studying the photocatalytic efficiency of these materials using a methyl orange−methylene blue (MO-MB) dye mixture model system under solar illumination revealed selective photocatalytic reversibility, with MB and MO photodegradation performed by yellow TiO 2 and brown TiO 2−x , respectively. This is the first report on the use of surface-charged brown TiO 2−x with porous flower aggregate morphology for selective photocatalysis.

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Facile synthesis of porous TiO2 nanospheres and their photocatalytic properties

Cited by 23 publications

References 55 publications

Degradation of Methylene Blue Dye in the Presence of Visible Light Using SiO2@α-Fe2O3 Nanocomposites Deposited on SnS2 Flowers

Degradation of Methylene Blue Dye in the Presence of Visible Light Using SiO2@α-Fe2O3 Nanocomposites Deposited on SnS2 Flowers

Degradation of Methylene Blue Dye in the Presence of Visible Light Using SiO<sub>2</sub>@α-Fe<sub>2</sub>O<sub>3</sub> Nanocomposites Deposited on SnS<sub>2</sub> Flowers

Defect-Rich Brown TiO_2–x Porous Flower Aggregates: Selective Photocatalytic Reversibility for Organic Dye Degradation

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Facile synthesis of porous TiO2 nanospheres and their photocatalytic properties

Cited by 23 publications

References 55 publications

Degradation of Methylene Blue Dye in the Presence of Visible Light Using SiO2@α-Fe2O3 Nanocomposites Deposited on SnS2 Flowers

Degradation of Methylene Blue Dye in the Presence of Visible Light Using SiO2@α-Fe2O3 Nanocomposites Deposited on SnS2 Flowers

Degradation of Methylene Blue Dye in the Presence of Visible Light Using SiO<sub>2</sub>@&alpha;-Fe<sub>2</sub>O<sub>3</sub> Nanocomposites Deposited on SnS<sub>2</sub> Flowers

Defect-Rich Brown TiO2–x Porous Flower Aggregates: Selective Photocatalytic Reversibility for Organic Dye Degradation

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Product

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Degradation of Methylene Blue Dye in the Presence of Visible Light Using SiO<sub>2</sub>@α-Fe<sub>2</sub>O<sub>3</sub> Nanocomposites Deposited on SnS<sub>2</sub> Flowers

Defect-Rich Brown TiO_2–x Porous Flower Aggregates: Selective Photocatalytic Reversibility for Organic Dye Degradation