scholarly journals Novel TiO2 Nanoparticles/Polysulfone Composite Hollow Microspheres for Photocatalytic Degradation

Polymers ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 336
Author(s):  
Shangying Zhang ◽  
Qi Wang ◽  
Fengna Dai ◽  
Yangyang Gu ◽  
Guangtao Qian ◽  
...  
Keyword(s):  
Tio2 Nanoparticles ◽  
Titanium Oxide ◽  
Static Condition ◽  
Organic Pollution ◽  
Hollow Microspheres ◽  
Methyl Blue ◽  
Catalyst Loading ◽  
Composite Microsphere ◽  
Composite Microspheres ◽  
Loading Amount

Nanosized titanium oxide (TiO2) material is a promising photocatalyst for the degradation of organic pollutants, whereas the difficulty of its recycling hinders its practical application. Herein, we reported the preparation of a novel titanium oxide/polysulfone (TiNPs/PSF) composite hollow microspheres by the combination of Pickering emulsification and the solvent evaporation technique and their application for the photodegradation of methyl blue (MB). P25 TiO2 nanoparticles dispersed on the surface of PSF microspheres. The porosity, density and photoactivity of the TiNPs/PSF composite microsphere are influenced by the TiO2 loading amount. The composite microsphere showed good methyl blue (MB) removal ability. Compared with TiO2 P25, and PSF, a much higher MB adsorption speed was observed for TiNPs/PSF microspheres benefited from their porous structure and the electrostatic attractions between the MB+ and the negatively charged PSF materials, and showed good degradation efficiency. For TiNPs/PSF composite microsphere with density close to 1, a 100% MB removal (10 mg L−1) within 120 min at a catalyst loading of 2.5 g L−1 can be obtained under both stirring and static condition, due to well dispersing of TiO2 particles on the microsphere surface and its stable suspending in water. For the non-suspended TiNPs/PSF composite microsphere with density bigger than 1, the 100% MB removal can be only obtained under stirring condition. The removal efficiency of MB for the composite microspheres retained 96.5%, even after 20 cycles. Moreover, this composite microsphere also showed high MB removal ability at acidic condition. The high catalysis efficiency, excellent reusability and good stability make this kind of TiNPs/PSF composite microsphere a promising photocatalyst for the water organic pollution treatment.

Preparation and Characterization of Gelatin/Oligomeric Proanthocyanidins Composite Microspheres

2011 ◽  
Vol 287-290 ◽  
pp. 132-135
Author(s):  
Ching Wen Lou ◽  
Jin Jia Hu ◽  
Chao Chiung Huang ◽  
Shih Yu Huang ◽  
Hsiu Hui Yeh ◽  
...  
Keyword(s):  
Biomedical Applications ◽  
Air Permeability ◽  
Wound Dressings ◽  
Water Contact ◽  
Composite Microsphere ◽  
Oligomeric Proanthocyanidins ◽  
Composite Microspheres ◽  
Hemostatic Activity ◽  
Potential Use

Gelatin is a heterogeneous mixture of single or multi-stranded polymers made of amino acids. Its film formability, air permeability, biocompatibility, and hemostatic activity render it appropriate for wound dressing. In this study, we used a syringe to drop gelatin solution into oligomeric proanthocyanidins solution to prepare the composite microspheres. Physical properties of the composite microsphere, such as swelling, stability in water, contact angle, and Fourier transform infrared spectroscopy were examined. We aimed at investigating its potential use in promoting wound healing along with wound dressings. The greatest swelling (1480 %) of the gelatin/OPC composite microsphere was achieved in 10 min. The composite microspheres dissolved 90% in the first 60 min during water stability test. Therefore, the developed composite microsphere has great hydrophilic and can be used in biomedical applications.

INVESTIGATION OF TRIBOLOGICAL PROPERTIES OF PALM OIL BIOLUBRICANT MODIFIED NANOPARTICLES

2015 ◽  
Vol 76 (9) ◽  
Author(s):  
Mohd Zulfadhli Shaari ◽  
N. R. Nik Roselina ◽  
Salmiah Kasolang ◽  
Koay Mei Hyie ◽  
Mardziah Che Murad ◽  
...  
Keyword(s):  
Tio2 Nanoparticles ◽  
Titanium Oxide ◽  
Coefficient Of Friction ◽  
Tribological Properties ◽  
Palm Oil ◽  
Tribological Behavior ◽  
Mineral Oil ◽  
Ultrasonic Technique ◽  
Wear Scar Diameter ◽  
Weight Percentage

The performance of a biolubricant especially palm oil is well known to be lower than a mineral oil lubricant. Due to a huge demand towards sustainability, it is extremely important to make an effort for biolubricant to be competitive at the same shelf as the mineral oil in the world’s lubricants market. In this study, tribological properties of the palm oil biolubricant modified with Titanium Oxide (TiO2) nanoparticles as additives were investigated. Palm oil biolubricant with TiO2 nanoparticles at weight ratios of 0 to 0.2 wt% were mixed using an ultrasonic technique. The viscosity of biolubricant modified additives was conducted using standard of ASTMD445. The tribological behavior was investigated using a four-ball tribotester. Results indicate that the viscosities of samples increased as the weight percentage of the TiO2 nanoadditives increased for both 40°C and 100°C temperatures Sample of lubricant with 0.1% wt of the TiO2 nanoadditives produced the lowest coefficient of friction (COF) and wear scar diameter. 

scholarly journals Effect of Titanium Oxide Nano Lubricants Applied to R134a Refrigeration System

2020 ◽  
Vol 8 (5) ◽  
pp. 5557-5559
Keyword(s):  
Steady State ◽  
Tio2 Nanoparticles ◽  
Titanium Oxide ◽  
Cooling Capacity ◽  
Coefficient Of Performance ◽  
Refrigeration System ◽  
Compressor Work

In this work experiment is performed by using titanium oxide (Tio2) nanoparticles at three different nanoaparticles containing lubricants 0.2g/l,0.4g/l as well as 0.6g/l . An experiment was performed by dispersing titanium oxide (Tio2) nanoparticles and the variables such as compressor work, Coefficient of performance (C.O.P) and refrigeration has been analysed.The experiment was conducted with R134a refrigerant under steady state conditions.Inclusion of Tio2 nanoparticles improved the coefficient as well as cooling capacity of presentation and the compressor work is get reduced.

Synthesis and photoluminescence properties of titanium oxide (TiO2) nanoparticles: Effect of calcination temperature

Optik ◽  
2019 ◽  
Vol 194 ◽  
pp. 163070 ◽  
Author(s):  
N.C. Horti ◽  
M.D. Kamatagi ◽  
N.R. Patil ◽  
S.K. Nataraj ◽  
M.S. Sannaikar ◽  
...  
Keyword(s):  
Tio2 Nanoparticles ◽  
Titanium Oxide ◽  
Calcination Temperature ◽  
Photoluminescence Properties

Influence of UV radiation on TiO2 nanoparticles antibacterial behaviour

2020 ◽  
Vol 1 (101) ◽  
pp. 25-31
Author(s):  
K. Szmajnta ◽  
M.M. Szindler
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Particle Size ◽  
Particle Size Distribution ◽  
Tio2 Nanoparticles ◽  
Titanium Oxide ◽  
Uv Radiation ◽  
Antibacterial Properties ◽  
Oxide Nanoparticles ◽  
Yeast Saccharomyces Cerevisiae ◽  
Titanium Oxide Nanoparticles

Purpose: The influence of UV radiation on the antibacterial properties of titanium oxide nanoparticles was examined using yeast Saccharomyces cerevisiae strain for this purpose. Design/methodology/approach: Nanopowders were made with sol-gel method. Surface morphology studies of the obtained materials were made using Zeiss's Supra 35 scanning electron microscope. In order to confirm the chemical composition of observed nanopowders, qualitative tests were performed by means of spectroscopy of scattered X-ray energy using the Energy Dispersive Spectrometer (EDS). The DLS (Dynamic Light Scattering) method was used to analyse the particle size distribution using the AntonPaar Litesizer 500 nanoparticle size analyser. Changes in particle size distribution at elevated temperatures were also observed. The antibacterial properties of titanium oxide nanoparticles were examined by subjecting the yeast sample to irradiation with an UV lamp. Findings: Samples containing yeast Saccharomyces cerevisiae were irradiated with and without the addition of TiO2 nanoparticles. A faster decrease in the colony count was observed compared to irradiated exposures without the addition of a suspension. Practical implications: Presented materials can be used in the production of antibacterial coatings for surfaces occurring in public spaces such as schools, hospitals, public toilets for the simple and effective elimination of bacteria and fungi as a result of exposures. Originality/value: The antibacterial properties of titanium oxide nanoparticles under UV radiation were confirmed.

Preparation of β-CD-HAP Composite Microspheres

2016 ◽  
Vol 697 ◽  
pp. 67-70
Author(s):  
Liang Liang Luo ◽  
Liang Hu ◽  
Xiao Feng Xing ◽  
Wei Min Gao ◽  
Yu Ping Guo
Keyword(s):  
Raw Materials ◽  
Tween 80 ◽  
Hydroxyapatite Nanoparticles ◽  
Composite Microsphere ◽  
X Ray ◽  
Composite Microspheres ◽  
Transmission Electron ◽  
Structure Morphology ◽  
Ft Ir ◽  
Mixed Emulsifier

β-cyclodextin-hydroxyapatite (β-CD-HAP) composite microspheres were prepared in invert microemulsion method using spherical morphology hydroxyapatite nanoparticles (nHAP) as raw materials, Span-Tween cosurfactant as mixed emulsifier and epichlorohydrin as cross linker agent. The structure, morphology and β-CD-HAP was characterized by Fourier transform Infrared spectroscope (FT-IR), X-ray powder diffraction (XRD), transmission electron microscope (SEM). Results showed that the β-CD-HAP microspheres were synthesized by adding epichlorohydrin, span-80, tween-80, and sodium hydroxide and the particle size of β-CD-HAP composite microsphere with good dispersion was several tens of nanometer.

Facile large scale preparation and electromagnetic properties of silica–nickel–carbon composite shelly hollow microspheres

2016 ◽  
Vol 45 (7) ◽  
pp. 2881-2887 ◽  
Author(s):  
Zhenguo An ◽  
Jingjie Zhang
Keyword(s):  
Large Scale ◽  
Carbon Composite ◽  
Hollow Microspheres ◽  
Electromagnetic Properties ◽  
Hollow Structures ◽  
Composite Microspheres ◽  
Large Scale Preparation ◽  
Scale Preparation

Silica–nickel–carbon composite microspheres with shelly hollow structures and tunable electromagnetic properties were prepared in large scale through a three-step route.

scholarly journals Label-Free Electrochemical Sensor Based on Manganese Doped Titanium Dioxide Nanoparticles for Myoglobin Detection: Biomarker for Acute Myocardial Infarction

Molecules ◽  
2021 ◽  
Vol 26 (14) ◽  
pp. 4252
Author(s):  
Adel Al Fatease ◽  
Mazharul Haque ◽  
Ahmad Umar ◽  
Shafeeque G. Ansari ◽  
Yahya Alhamhoom ◽  
...  
Keyword(s):  
Electrochemical Sensor ◽  
Tio2 Nanoparticles ◽  
Titanium Oxide ◽  
Titanium Dioxide Nanoparticles ◽  
Metal Oxide Nanoparticles ◽  
Pure Titanium ◽  
Label Free ◽  
Doped Tio2 ◽  
Vis Spectroscopy ◽  
Mn Doped

A label free electrochemical sensor based on pure titanium oxide and manganese (Mn)-doped titanium oxide (TiO2) nanoparticles are fabricated and characterized for the sensitive detection of myoglobin (Mb) levels to analyze the cardiovascular infarction. Pristine and Mn-doped TiO2 nanoparticles were synthesized via the sol-gel method and characterized in order to understand their structure, morphologies, composition and optical properties. The structural properties revealed that the pure- and doped-TiO2 nanoparticles possess different TiO2 planes. FTIR studies confirm the formation of metal oxide nanoparticles by exhibiting a well-defined peak in the range of 600–650 cm−1. The values of the optical band gap, estimated from UV-Vis spectroscopy, are decreased for the Mn-doped TiO2 nanoparticles. UV-Vis spectra in the presence of myoglobin (Mb) indicated interaction between the TiO2 nanoparticles and myoglobin. The SPE electrodes were then fabricated by printing powder film over the working electrode and tested for label-free electrochemical detection of myoglobin (Mb) in the concentration range of 0–15 nM Mb. The fabricated electrochemical sensor exhibited a high sensitivity of 100.40 μA-cm−2/nM with a lowest detection limit of 0.013 nM (0.22 ng/mL) and a response time of ≤10 ms for sample S3. An interference study with cyt-c and Human Serum Albumin (HSA) of the sensors show the selective response towards Mb in 1:1 mixture.

SYNTHESIS OF Ni–Bi–P HOLLOW MICROSPHERES WITH OUTSTANDINGLY HIGH ACTIVITY TOWARD THE CATALYTIC REDUCTION OF p-NITROPHENOL

2019 ◽  
Vol 26 (05) ◽  
pp. 1850192
Author(s):  
XIANGRUI MENG ◽  
MEIFENG HAO ◽  
YIWEI JIANG ◽  
XIANGZHENYUE SUN ◽  
YAN WANG ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Catalytic Reduction ◽  
Hollow Structure ◽  
Hollow Microspheres ◽  
High Catalytic Activity ◽  
P Elements ◽  
Composite Microspheres ◽  
Explosion Method ◽  
Space Limitation ◽  
Wet Explosion

A simple wet-explosion method was employed to synthesize the Ni–Bi–P composite microspheres. The hollow structure was obtained possibly due to the violent evolution of gas bubbles when the reaction reagents were mixed. The hollow microspheres of Ni–Bi–P exhibited outstanding high catalytic activity for the reduction of [Formula: see text]-nitrophenol ([Formula: see text]-NP) to form [Formula: see text]-aminophenol in the presence of NaBH4 within only 1[Formula: see text]s. Due to the space limitation, the hollow structure of Ni–Bi–P microspheres helps to accommodate and confine the molecules of NaBH4 and [Formula: see text]-NP within the small space where NaBH4 and [Formula: see text]-NP contact closely at Ni–Bi–P catalysts. The synergetic action of Ni, Bi and P elements also contributes the enhanced catalytic activity.

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