Synthesis and Photocatalytic Properties of Three-Dimensional Mesoporous Titanium Dioxide

The three-dimensional (3D) mesoporous titanium dioxide (TiO2) was synthesized by microwave-assisted hydrothermal method, using titanium sulfate as titanium source and urea to adjust pH value. Its structure and photocatalytic oxidation properties were studied. The results show that the TiO2 particles have a 3D mesoporous structure, uniform distribution and spherical shape, the average diameter is about 0.67[Formula: see text][Formula: see text]m. These properties provide strong light adsorption, high specific surface area, which increases the active site of the photocatalyst, porosity can also enhance the ability of the material to adsorb pollutants, thus has better stability. It was applied to photocatalytic degradation of 10[Formula: see text]mg/L rhodamine B (RhB) solution. After 80[Formula: see text]min of irradiation under 420[Formula: see text]nm ultraviolet (UV) light, the degradation rate of RhB reached more than 90%. In addition, it also provided an excellent photocatalytic efficiency of removing Hg0 in simulated flue gas. The removal efficiency could still reach over 86% after 40 h, which could be used in the treatment of heavy metal pollutants such as metallurgical flue gas.

Download Full-text

Studies on Effect Factors of Porous Titanium Dioxide Film Degrading Azo Dyes

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.531.403 ◽

2012 ◽

Vol 531 ◽

pp. 403-406 ◽

Cited By ~ 1

Author(s):

Sheng Min Sun

Keyword(s):

Titanium Dioxide ◽

Ph Value ◽

Uv Light ◽

Pure Titanium ◽

Degradation Process ◽

Porous Titanium ◽

Titanium Dioxide Film ◽

Effect Factors ◽

Micro Arc Oxidation ◽

Dioxide Film

In pure titanium body, through the method of micro-arc oxidation (MAO) on the surface of porous titanium dioxide film and study on factors of methyl orange in the light influence of catalytic degradation process, the results show that: with uv light for the source, pH value of 5, micro-arc oxidation voltage is 400 V, the catalytic activity of porous titanium dioxide film was the highest.

Download Full-text

Enhanced Photocatalytic Activity of N/Li2MoO4 Co-doped TiO2 Nanoparticles under Visible Light

Applied Science and Engineering Progress ◽

10.14416/j.asep.2021.10.007 ◽

2021 ◽

Author(s):

Jutarat Kwakkaew ◽

Matthana Khangkhamano ◽

Rungrote Kokoo ◽

Weerachai Sangchay

Keyword(s):

Photocatalytic Activity ◽

Visible Light ◽

Tio2 Nanoparticles ◽

Photocatalytic Oxidation ◽

Uv Light ◽

Visible Region ◽

Strong Light ◽

Doped Tio2 ◽

Vis Spectroscopy ◽

Wide Range

TiO2-based nanomaterials have been extensively synthesized and used in a wide range of photocatalytic applications. The photocatalytic oxidation process, however, is only activated by irradiation with ultraviolet (UV) light which limits its indoor applications. Herein, to improve such limitations, N/Li2MoO4-doped TiO2 nanoparticles were prepared via sol-gel method. Li2MoO4 concentration was varied. The catalysts were characterized by XRD, XPS, FE-SEM, and UV-Vis spectroscopy. As-synthesized N/Li2MoO4-doped TiO2 catalysts exhibited their crystal sizes of as fine as 20 nm in diameter whereas that of the pure TiO2 was about 35 nm. The absorption ranges of the N/ Li2MoO4-doped catalysts were relocated from UV region toward visible light region. The catalyst with 1 mol% Li2MoO4 offered the highest degradation rate of methylene blue (MB) solution upon visible light irradiation. Its fine crystal size, narrow band gap energy (2.82 eV), high defect concentration, and strong light absorption in visible region are responsible for the enhanced photocatalytic activity of the 1 mol% Li2MoO4.

Download Full-text

Rubpy Dye-Doped Silica Nanoparticles as Signal Reporter in a Dot Fluorescence Immunoassay Strip

Journal of Nanomaterials ◽

10.1155/2014/851905 ◽

2014 ◽

Vol 2014 ◽

pp. 1-6 ◽

Cited By ~ 5

Author(s):

Nualrahong Thepwiwatjit ◽

Aree Thattiyaphong ◽

Pichet Limsuwan ◽

Kooranee Tuitemwong ◽

Pravate Tuitemwong

Keyword(s):

Silica Nanoparticles ◽

Uv Light ◽

Spherical Shape ◽

High Sensitivity ◽

Average Diameter ◽

Test Strip ◽

Test Sample ◽

Positive Sample ◽

Rapid Screening ◽

Fluorescence Immunoassay

This paper describes an application of Rubpy dye-doped silica nanoparticles (RSNPs) as signal reporter in a dot fluorescence immunoassay strip for rapid screening ofVibrio choleraO1 (VCO1). These nanoparticles have a spherical shape with an average diameter of 45 nm. They appear luminescent orange when excited with a 312 nm UV lamp. Based on the sandwich immunoassay principle, a test strip was made of a nitrocellulose membrane dotted with monoclonal antibodies against VCO1 as analyte capture molecules. After introducing a test sample, followed by polyclonal rabbit anti-VCO1 antibody conjugated RSNPs as detection reporters and one washing step, the presence or absence of the target bacteria could be identified under UV light by naked eyes. A positive sample would signal a bright orange dot on the strip. The proposed assay had a detection limit of4.3×103 cfu/mL and was successfully applied as a rapid screening test for VCO1 in food samples with high sensitivity, specificity, and accuracy.

Download Full-text

Anchoring nickel nanoparticles on three-dimensionally macro-/mesoporous titanium dioxide with a carbon layer from polydopamine using polymethylmethacrylate microspheres as sacrificial templates

Materials Chemistry Frontiers ◽

10.1039/c8qm00467f ◽

2019 ◽

Vol 3 (2) ◽

pp. 224-232 ◽

Cited By ~ 44

Author(s):

Jing Zheng ◽

Min Zhang ◽

Teng Miao ◽

Jingxia Yang ◽

Jingli Xu ◽

...

Keyword(s):

Titanium Dioxide ◽

Protein Adsorption ◽

Nickel Nanoparticles ◽

Three Dimensional ◽

Carbon Layer ◽

Mesoporous Titanium Dioxide

Herein, three dimensional (3D) macro-/mesoporous TiO2@C–Ni composites have been successfully fabricated, which endowed the composites with enhanced performance in catalysis and protein adsorption.

Download Full-text

Preparation of mesoporous TiO2 with enhanced photocatalytic activity towards tannery wastewater degradation

Water Science & Technology ◽

10.2166/wst.2017.018 ◽

2017 ◽

Vol 75 (6) ◽

pp. 1494-1499 ◽

Cited By ~ 6

Author(s):

Weiwei Zhao ◽

Xiu He ◽

Yu Peng ◽

Hongfeng Zhang ◽

Donglan Sun ◽

...

Keyword(s):

Photocatalytic Activity ◽

Photocatalytic Oxidation ◽

Ph Value ◽

Uv Light ◽

High Surface ◽

Sodium Dodecyl ◽

Sodium Dodecyl Benzene Sulfonate ◽

Mesoporous Tio2 ◽

Tannery Wastewater ◽

Diameter Distribution

Ordered mesoporous TiO2 materials are successfully synthesized via a sol-gel route using butyl titanate as a precursor and sodium dodecyl benzene sulfonate surfactants as soft templates. The as-prepared TiO2 samples possess a relatively high surface area of 40.03 m2/g and the center of pore diameter distribution of 13.04 nm. They exhibit excellent photocatalytic activity towards degradation of organic pollutants in tannery wastewater under UV-light and natural sunlight irradiation. The effect of the catalyst dosage, the pH value of the solution and the concentration of H2O2 are discussed in detail. This work would pave an avenue for purifying various industrial wastewaters through an advanced photocatalytic oxidation process.

Download Full-text

Imaging of platinum-shadowed macromolecular complexes in dark field

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100110891 ◽

1984 ◽

Vol 42 ◽

pp. 146-147

Author(s):

D.W. Andrews ◽

F.P. Ottensmeyer

Keyword(s):

Thin Film ◽

Three Dimensional ◽

Average Diameter ◽

Dark Field ◽

Bright Field ◽

Field Mode ◽

Macromolecular Complexes ◽

Average Mass ◽

Topological Features ◽

Projection Images

Shadowing with heavy metals has been used for many years to enhance the topological features of biological macromolecular complexes. The three dimensional features present in directionaly shadowed specimens often simplifies interpretation of projection images provided by other techniques. One difficulty with the method is the relatively large amount of metal used to achieve sufficient contrast in bright field images. Thick shadow films are undesirable because they decrease resolution due to an increased tendency for microcrystalline aggregates to form, because decoration artefacts become more severe and increased cap thickness makes estimation of dimensions more uncertain.The large increase in contrast provided by the dark field mode of imaging allows the use of shadow replicas with a much lower average mass thickness. To form the images in Fig. 1, latex spheres of 0.087 μ average diameter were unidirectionally shadowed with platinum carbon (Pt-C) and a thin film of carbon was indirectly evaporated on the specimen as a support.

Download Full-text

Fabrication of Eutectic Ga-In Nanowire Arrays Based on Plateau–Rayleigh Instability

Molecules ◽

10.3390/molecules26154616 ◽

2021 ◽

Vol 26 (15) ◽

pp. 4616

Author(s):

Takashi Ikuno ◽

Zen Somei

Keyword(s):

Integrated Circuits ◽

Substrate Surface ◽

Three Dimensional ◽

Average Diameter ◽

Nanowire Arrays ◽

Scanning Probe ◽

Rayleigh Instability ◽

Simple Method ◽

Flat Substrate ◽

Metal Nanowire

We have developed a simple method of fabricating liquid metal nanowire (NW) arrays of eutectic GaIn (EGaIn). When an EGaIn droplet anchored on a flat substrate is pulled perpendicular to the substrate surface at room temperature, an hourglass shaped EGaIn is formed. At the neck of the shape, based on the Plateau–Rayleigh instability, the EGaIn bridge with periodically varying thicknesses is formed. Finally, the bridge is broken down by additional pulling. Then, EGaIn NW is formed at the surface of the breakpoint. In addition, EGaIn NW arrays are found to be fabricated by pulling multiple EGaIn droplets on a substrate simultaneously. The average diameter of the obtained NW was approximately 0.6 μm and the length of the NW depended on the amount of droplet anchored on the substrate. The EGaIn NWs fabricated in this study may be used for three-dimensional wiring for integrated circuits, the tips of scanning probe microscopes, and field electron emission arrays.

Download Full-text