scholarly journals Study of the Effect of Titanium Dioxide Hydrosol on the Photocatalytic and Mechanical Properties of Paper Sheets

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1326 ◽  
Author(s):  
Roberta Grazia Toro ◽  
Mohamed Diab ◽  
Tilde de Caro ◽  
Mona Al-Shemy ◽  
Abeer Adel ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Atmospheric Pressure ◽  
Aging Process ◽  
Room Temperature ◽  
Barrier Properties ◽  
Anatase Tio2 ◽  
Titanium Butoxide ◽  
Hydrolysis Of

Different amounts of a stable aqueous TiO2 hydrosol were used to fabricate paper sheets having photocatalytic activity. The TiO2 hydrosol was prepared in aqueous medium using titanium butoxide as precursor and acetic acid as catalyst for the hydrolysis of titanium butoxide. An aging process at room temperature and atmospheric pressure was finally applied to obtain crystalline anatase TiO2 hydrosol. The effects of different TiO2 hydrosol loadings on the mechanical strength and barrier properties of modified paper sheets were investigated in detail. The photocatalytic behavior of TiO2-modified paper sheets was investigated as well using methylene blue (MB) as target pollutant.

Effect of Niobium on the Structure and Photoactivity of Anatase (TiO2) Nanoparticles

2006 ◽  
Vol 6 (3) ◽  
pp. 762-770 ◽  
Author(s):  
Masanori Hirano ◽  
Kazumasa Matsushima
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Solid Solutions ◽  
Uv Light ◽  
Anatase Tio2 ◽  
Hydrothermal Conditions ◽  
Niobium Content ◽  
Uv Light Irradiation ◽  
Adsorption Amount ◽  
Hydrolysis Of

Anatase-type TiO2 nanoparticles doped with 0–30 mol% niobium were directly formed from precursor solutions of TiOSO4 and NbCl5 under mild hydrothermal conditions at 120–180 °C for 5 h using the hydrolysis of urea. When the niobium content increased from 0 to 30 mol%, the crystallite size of anatase increased from 8.5 to 19 nm. The band gap of anatase was slightly decreased by making solid solutions with niobium. Their photocatalytic activity and adsorptivity were evaluated separately by the measurement of the concentration of methylene blue (MB) remained in the solution after maintained in the dark or under UV-light irradiation. To form anatase-type solid solutions by doping 5–15 mol% niobium into TiO2 was effective for improvement of the photoactivity of TiO2. The photocatalytic activity (the photooxidation rate) and the adsorption amount of MB for the sample containing 15 mol% niobium became more than approximately nine times and six times as much as those of the hydrothermal anatase-type pure TiO2, respectively.

scholarly journals Zirconium-Doped Chromium IV Oxide Nanocomposites: Synthesis, Characterization, and Photocatalysis towards the Degradation of Organic Dyes

Catalysts ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 117
Author(s):  
Zahir Muhammad ◽  
Farman Ali ◽  
Muhammad Sajjad ◽  
Nisar Ali ◽  
Muhammad Bilal ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Solid State ◽  
Room Temperature ◽  
Organic Dyes ◽  
Uv Light ◽  
Heterogeneous Photocatalysis ◽  
Ft Ir ◽  
Complete Mineralization

Degradation of organic dyes and their byproducts by heterogeneous photocatalysts is an essential process, as these dyes can be potentially discharged in wastewater and threaten aquatic and xerophyte life. Therefore, their complete mineralization into nontoxic components (water and salt) is necessary through the process of heterogeneous photocatalysis. In this study, Zr/CrO2 (Zirconium-doped chromium IV oxide) nanocomposite-based photocatalysts with different compositions (1, 3, 5, 7 & 9 wt.%) were prepared by an environmentally friendly, solid-state reaction at room temperature. The as-prepared samples were calcined under air at 450 °C in a furnace for a specific period of time. The synthesis of Zr/CrO2 photocatalysts was confirmed by various techniques, including XRD, SEM, EDX, FT-IR, UV-Vis, and BET. The photocatalytic properties of all samples were tested towards the degradation of methylene blue and methyl orange organic dyes under UV light. The results revealed a concentration-dependent photocatalytic activity of photocatalysts, which increased the amount of dopant (up to 5 wt.%). However, the degradation efficiency of the catalysts decreased upon further increasing the amount of dopant due to the recombination of holes and photoexcited electrons.

Effect of Aging Process on Microstructure and Room Temperature Ductility of TB6 Titanium Alloy

2014 ◽  
Vol 1061-1062 ◽  
pp. 567-570
Author(s):  
Cui Ye ◽  
Fei Zhao ◽  
Fang Zhou ◽  
Ni Li ◽  
Jun Shuai Li
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Titanium Alloy ◽  
Aging Time ◽  
Aging Temperature ◽  
Aging Process ◽  
Room Temperature ◽  
Room Temperature Ductility ◽  
Tb6 Titanium Alloy

Microstructure and room temperature ductility of the TB6 titanium alloy was investigated by varying the aging temperature and the aging time.The results show that, the alloy’s contraction of area increases while the tensile strength firstly increases and then decreases by raising their aging temperature. In general, the ductility of the samples increases and the strength decreases with the increasing aging time. The optimum mechanical properties are obtained by aging at 650 °C for 2 h.

Effects of Surfactant Composition and Concentration on Shape, Size and Photocatalytic Activity of TiO2 Nanoparticles

2007 ◽  
Vol 5 (1) ◽  
Author(s):  
Dongliang Liao ◽  
Baoqiang Liao
Keyword(s):  
Photocatalytic Activity ◽  
Tio2 Nanoparticles ◽  
Sol Gel ◽  
Photocatalytic Decomposition ◽  
Batch Reactors ◽  
Order Kinetic ◽  
Titanium Butoxide ◽  
Reaction Rate Constants ◽  
Surfactant Composition ◽  
Hydrolysis Of

Various shapes and sizes, including spherical, cubic nanoparticles and hexagonal nanorods with the dimensions of 50-500nm, of TiO2 were prepared through hydrolysis of titanium butoxide in sol-gel method with the introduction of different surfactant composition and concentrations during preparation. Prepared TiO2 nanoparticles were studied for photocatalytic decomposition of methyl orange (MO) in fixed film batch reactors. The results showed that shape, size and photocatalytic activity of TiO2 depend not only on surfactant composition but also on surfactant concentration. Photocatalytic decomposition of MO followed the first order kinetic reaction. The analysis of reaction rate constants showed that the shape is more important than the size in determining the photocatalytic activity of shape- and size-controlled TiO2 nanoparticles. TiO2 nanorods had higher photocatalytic activities than spherical and cubic TiO2 nanoparticles.

Photocatalytic Activity of Mixed Phase TiO2 from Microwave-Assisted Synthesis

2013 ◽  
Vol 664 ◽  
pp. 661-666 ◽  
Author(s):  
Nuchanaporn Pijarn ◽  
Sirithan Jeimsirilers ◽  
Supatra Jinawath
Keyword(s):  
Methylene Blue ◽  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Organic Compounds ◽  
Irradiation Time ◽  
Synthesis Method ◽  
Microwave Assisted Synthesis ◽  
Microwave Assisted ◽  
Bacteria And Fungi ◽  
Hydrolysis Of

Photocatalyst is an environmental clean-up material when exposed to light. It can decompose organic compounds, bacteria and fungi as well as foul odors. Titanium dioxide (TiO2) has long been well known for its powerful photocatalytic activity. However, its properties depend on several factors and synthesis method is one of them. In this work, TiO2powders were prepared by three methods, namely microwave-assisted hydrolysis of titanium oxysulfate (TiOSO4), hydrolysis of TiOSO4, and also by calcining of TiOSO4. Photocatalytic activity of the obtained TiO2powders were evaluated through the decomposition of methylene blue in comparison with P25 (Degussa). Results showed that the TiO2prepared at conditions of microwave 100 watts, irradiation time of 10 min was most effective when compared with the others in this work.

ZnS:Mn2+ Quantum Dots as Efficient Photocatalyst for Organic Dye Decolorization

2018 ◽  
Vol 386 ◽  
pp. 207-213
Author(s):  
Ksenia A. Sergeeva ◽  
Alexander A. Sergeev ◽  
Yulia V. Kuznetsova ◽  
Sergey S. Voznesenskiy
Keyword(s):  
Methylene Blue ◽  
Quantum Dots ◽  
Photocatalytic Activity ◽  
Room Temperature ◽  
Dye Decolorization ◽  
Organic Dye ◽  
Intrinsic Defect ◽  
Zinc Blende ◽  
Decolorization Efficiency ◽  
Uv Excitation

Fluorescent zinc blende structured pure and Mn2+ doped ZnS quantum dots were prepared by simple aqueous based technique at room temperature. Under UV-excitation the quantum dots show photoluminescence bands at 2.1 and 3.0 eV corresponded to Mn2+ and ZnS intrinsic defect emission, respectively. The photocatalytic activity was tested for the photodegradation of methylene blue in aqueous solution. The influence of the Mn2+ concentration on the dye decolorization efficiency was studied. The highest photocatalytic degradation rate of methylene blue was obtained for ZnS quantum dots in glutathione shell doped with 0.5 at.% of Mn2+. The mechanisms of photoluminescence and photocatalytic activity were discussed.

scholarly journals Low temperature synthesis of water dispersible F-doped TiO2 nanorods with enhanced photocatalytic activity

RSC Advances ◽  
2017 ◽  
Vol 7 (35) ◽  
pp. 21547-21555 ◽  
Author(s):  
Jiaxu Zhao ◽  
Wenting Li ◽  
Xue Li ◽  
Xiaokai Zhang
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Low Temperature ◽  
Atmospheric Pressure ◽  
Tio2 Nanorods ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Doped Tio2 ◽  
Water Dispersible ◽  
Visible Irradiation

F-doped TiO2 nanorods are prepared at 100 °C and atmospheric pressure in the presence of NaF, which show superior photocatalytic activity for the degradation of methylene blue under UV and visible irradiation.

Study on Preparation and Properties of PA6/TiO2-GO Composites

2020 ◽  
Vol 1001 ◽  
pp. 224-228
Author(s):  
Dan Liu
Keyword(s):  
Mechanical Properties ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Breaking Strength ◽  
Degree Of Crystallinity ◽  
Methylene Blue Solution ◽  
Elongation At Break ◽  
Increasing Trend ◽  
Blue Solution ◽  
The Degree Of Crystallinity

In this paper, the effect of nanoTiO2 content on the thermal properties, mechanical properties, photocatalytic properties of PA6/TiO2-GO composites were investigated. The results indicated that the melting point of the composites decreased gradually with an increase of nanoTiO2 content, and the degree of crystallinity exhibited an increasing trend at first and then tended to decrease. Meanwhile, the breaking strength decreased gradually, whereas the elongation at break increased gradually. Moreover, the nanoTiO2 exhibited an increasing photocatalytic activity for degradation of the methylene blue solution. The incorporation of graphene oxide (GO) could effectively improve the photocatalytic effectiveness of nanoTiO2 by approximately 11%.

scholarly journals Improved Self-Cleaning Properties of Photocatalytic Gypsum Plaster Enriched with Glass Fiber

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 357 ◽  
Author(s):  
Kamila Zając ◽  
Magdalena Janus ◽  
Antoni Morawski
Keyword(s):  
Mechanical Properties ◽  
Methylene Blue ◽  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Glass Fiber ◽  
Glass Fibers ◽  
The Self ◽  
Gypsum Plaster ◽  
Self Cleaning ◽  
Reactive Orange

In the study the self-cleaning properties of photoactive gypsum plasters are presented. The modified gypsum plasters were obtained by addition of 1 and 3 wt.% of nitrogen-modified titanium dioxide (TiO2/N) and 0.1, 0.3, and 0.5 wt.% of glass fiber. The self-cleaning ability of the obtained materials was tested during two dyes decomposition: Methylene Blue (MB) and Reactive Orange (RO). It was found that presence of glass fiber increased photocatalytic activity of modified gypsum plasters, which may be due to the fact glass fiber may act as ducts for light and transport it to sites screened by TiO2 or glass fiber can retard charge recombination. Moreover, unexpectedly the addition of glass fiber did not increase the mechanical properties of modified gypsum plasters, which may be because gypsum does not strongly adhere to the surface of glass fibers.

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