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Blue TiO2

Md Manik Mian, Guijian Liu
Novel TiO2 /Fe/Fe3 C-biochar composite, as a heterogeneous catalyst, has been synthesized by a single-step route, where sewage sludge (SS) and different ratios of nanoparticles (NPs: Fe and Ti) impregnated with chitosan using coagulation and flocculation techniques for subsequent thermal decomposition at 800 °C. The physiochemical properties of samples have been characterized thoroughly and employed in methylene blue (MB) degradation tests. It was found that NPs ratio and chitosan support have significant influences on the properties and catalytic activity of catalysts...
October 6, 2018: Chemosphere
Elisangela P Da Silva, Manuel E G Winkler, Willyan M Giufrida, Lucio Cardozo-Filho, Christian G Alonso, Jardel B O Lopes, Adley F Rubira, Rafael Silva
Photocatalytic activity of TiO2 nanoparticles is highly dependent on their phase composition. The coexistence of anatase and rutile phases in a single nanoparticle eases the electron transfer process between the phases, and favors the separation of photogenerated pairs. In this work, highly photoactive mixed-phase TiO2 nanostructures were prepared by supercritical antisolvent precipitation (SAS), an environmentally friendly technology. It is shown here that this methodology has the remarkable ability to produce highly porous (515 m2 /g) and crystalline TiO2 nanoparticles...
September 29, 2018: Journal of Colloid and Interface Science
Zafar Khan Ghouri, Khaled Elsaid, Ahmed Abdala, Saeed Al-Meer, Nasser A M Barakat
In this study, hybrid graphene-Pt/TiO2 nanostructure were synthesized by single-step, inexpensive and surfactant/organic solvent free route; hydrothermal technique. The physicochemical properties of hybrid graphene-Pt/TiO2 nanostructure were carefully analyzed by multiple techniques, including X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscope (FESEM) and transmission electron microscope (TEM). The synthesized hybrid nanostructures were utilized as photocatalyst for the degradation of methylene blue (MB) dye under natural environment at average ambient temperature and mean daily global solar radiation, of about 22-25 °C and 374...
October 2, 2018: Scientific Reports
Agata Gozdecka, Agnieszka E Wiącek
The effect of chitosan, pH and UV-VIS radiation on the adsorption-photocatalytic properties of TiO2 dispersion was investigated on the basis of electrophoretic mobility, as well as spectrophotometric and dynamic light scattering measurements. For the degradation efficiency tests two different dyes: the cationic - methylene blue and the anionic - sunset yellow were used. The stability and photodegradation experiments were performed by varying the parameters: wavelength of light (range 450-750 nm), type and radiation time (UV and VIS; 0-5 h), pH (3 and 6) and pigment concentration (0...
December 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
David Wiedmer, Chen Cui, Florian Weber, Fernanda C Petersen, Hanna Tiainen
Biomaterials which promote tissue integration and resist microbial colonisation are required in bone tissue engineering to prevent biomaterial-associated infections. Surface modification of established materials for bone tissue engineering, such as TiO2 , have emerged as promising anti-infective strategies. Interestingly, the antibacterial activity of TiO2 in the form of particles can be enhanced by combining it with H2 O2 , even in the absence of irradiation. However, it remains unknown whether TiO2 surfaces elicit a similar effect...
October 9, 2018: ACS Applied Materials & Interfaces
Leshuai W Zhang, Nancy A Monteiro-Riviere
PURPOSE: The aim of this study was to evaluate and compare the toxicity of six different types of titanium dioxide (TiO2 ) nanoparticles (NP) on human epidermal keratinocytes (HEK). MATERIALS AND METHODS: Six TiO2 NP (A (10nm), A*(32nm), B (27.5nm), C (200nm), C*(30-40nm) and D*(200-400nm)) were suspended in water or culture medium, and characterized by transmission electron microcopy (TEM) and dynamic light scattering (DLS). In addition, these NP were assayed with cell viability, cytokine release and cellular uptake in HEK...
September 28, 2018: Cutaneous and Ocular Toxicology
Taddao Pahasup-Anan, Kowit Suwannahong, Wipada Dechapanya, Ratthapol Rangkupan
In present study, a simultaneous electrospinning and electrospraying (SEE) process was employed to produce microclusters of TiO2 nanoparticles and interlock them in nanofibrous network. The photocatalytic composite membranes (PCMs) were fabricated by electrospraying TiO2 nanoparticle suspension into microcluster form that dispersed and entrapped within nylon-6 electrospun fiber membrane. Three PCMs membrane with TiO2 content of 52.0, 83.6, and 91.7wt.% were successfully fabricated. The membrane consisted of TiO2 microclusters, ranging in sizes from around 0...
October 2018: Journal of Environmental Sciences (China)
Gabrielle Gomart, Julie Denis, Tristan Bourcier, Anne Dory, Ahmed Abou-Bacar, Ermanno Candolfi, Arnaud Sauer
Purpose: To assess the amoebicidal effect of titanium dioxide (TiO2)/UV-A combination against Acanthamoeba sp trophozoites and cysts. Methods: The amoebicidal effect of the TiO2/UV-A combination was tested on trophozoites and cysts of clinical isolates of Acanthamoeba hatchetti and Acanthamoeba sp genotype T4, obtained from two severe cases of ulcerative keratitis. Samples of cultured Acanthamoeba were transferred to a 96-well plate. We tested the effect of sterile water (blank control), TiO2 alone, UV-A alone, TiO2 and additional UV-A exposure, chlorhexidine 0...
September 4, 2018: Investigative Ophthalmology & Visual Science
Xin Wang, Yuren Xiang, Benqing Zhou, Youming Zhang, Jiatao Wu, Rui Hu, Liwei Liu, Jun Song, Junle Qu
The efficient utilization of solar energy for environmental cleaning has attracted great attention, where the key is to efficiently harvest the visible and near-infrared (NIR) light which occupies approximately 95% of the solar light energy. Recently, black phosphorus (BP), as a new staring 2D material, has been extensively studied as photocatalytic materials due to its broad light absorption and tunable bandgap. Herein, we report a novel ternary nanocomposite, BP-Ag/TiO2 , prepared through controlled deposition of Ag clusters on the surface of TiO2 nanocrystals and then incorporated to BP nanosheets...
September 5, 2018: Journal of Colloid and Interface Science
Manchao Wang, Lin Peng, Jiahui Wang, Changqing Li, Lihao Guan, Yuqing Lin
In this study, hierarchical ternary nanocomposites, i.e., Cu-TiO2-mesoporous silica microspheres (Cu-TiO2-MSM), were synthesized as ternary photocatalyst system to improve the visible light photocatalytic degradation of the environmental pollutant model dye methylene blue (MB). The innovation of this method is in situ depositing TiO2 and Cu2O nanoparticles sequentially onto the surface of mesoporous silica microspheres to form highly active heterostructure. The improved activity for the degradation of MB is attributed to: (1) the high adsorption capacity of the porous and interconnected-channel-structure MSM to MB; (2) the valence band electrons of TiO2 released from the conduction band generating abundant highly active free radicals, which directly reacted with adsorbed MB...
December 1, 2018: Journal of Nanoscience and Nanotechnology
Ruqaiya Al Nuumani, Guido Bolognesi, Goran T Vladisavljević
Application of TiO2 as a photocatalyst and UV protector is restricted by the difficulties in the recovery of TiO2 nanoparticles after water treatment. In this work, TiO2 nanoparticles (Degussa P25) were immobilised within easily recoverable poly(1,6-hexanediol diacrylate) poly(HDDA)-based polymer microspheres produced by on-the-fly photopolymerization of microfluidically generated droplets. Because of fast polymerization reaction, TiO2 was uniformly distributed within the polymer network. The transformation of double bonds in terminal vinyl groups of HDDA monomer into single bonds during photopolymerization was confirmed by Fourier transform infrared spectroscopy...
October 2, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Anu Mishra, Bhupendra Singh Butola
In this study, titanium tetra isopropoxide was used as pre-cursor of TiO2 for in-situ coating on cotton fabric by sol-gel-method. Subsequently, silver nitrate was used as doping agent to prepare silver doped TiO2 coated cotton fabric during hydrothermal treatment. The treated samples were characterized through Field Emission Scanning Electron Microscopy (FE-SEM), Energy-Dispersive X-ray (EDX) analysis, Inductively Coupled Plasma Mass Spectroscopy (ICP-MS) and UV-visible Absorption Spectroscopy to study morphology, composition of deposited elements and light absorption behavior of treated samples...
September 5, 2018: Photochemistry and Photobiology
Mudara Peiris, Chinthika Gunasekara, Pradeep Jayaweera, Neluka Fernando
Titanium dioxide (TiO2 ) has wide applications in food industry, cosmetics, pharmaceuticals and manufacturing industries due to its' many properties such as photocatalytic activity and stability. In this study, biosynthesis of TiO2 nanoparticles was achieved by using Baker's yeast. TiO2 nanoparticles were characterized by X-ray Diffraction (XRD), UV-Visible spectroscopy, Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM) and Energy Dispersive X-ray analysis (EDX) studies. The XRD pattern confirmed the formation of pure anatase TiO2 nanoparticles...
August 24, 2018: Journal of Microbiology and Biotechnology
Alessandro Di Mauro, Anton Landström, Isabella Concina, Giuliana Impellizzeri, Vittorio Privitera, Mauro Epifani
HYPOTHESIS: If nanocrystals of such semiconductor as SnO2 and TiO2 , which are not known as powerful adsorbents, have their surface modified by layer of V2 O5 , how will the adsorption properties be affected? Answering this question would provide a new set of surface properties to be designed by surface engineering of oxide nanocrystals. EXPERIMENTS: SnO2 and TiO2 colloidal nanocrystals were prepared by coupling sol-gel and solvothermal synthesis. By co-processing with V chloroalkoxide and subsequent heat-treatment at 400-500 °C, surface deposition of V2 O5 layers was obtained...
January 1, 2019: Journal of Colloid and Interface Science
Shiying Fan, Xinyong Li, Qidong Zhao, Libin Zeng, Mingmei Zhang, Zhifan Yin, Tingting Lian, Moses O Tadé, Shaomin Liu
This work reported that novel highly oriented and vertically aligned stoichiometric copper- and zinc-based ferrites, i.e., Cu0.5Zn0.5Fe2O4 quantum dots (QDs) anchored with TiO2 nanotube array electrode (NAE) composites, with n-n nano-heterojunctions and highly effective simulated solar light harvesting could be successfully achieved via electrochemical anodization followed by a vacuum-assisted impregnation strategy. It has been observed that Cu0.5Zn0.5Fe2O4 QDs/TiO2 NAE composites exhibit distinctly enhanced visible light photoelectrocatalytic (PEC) performance toward the degradation of typical pollutants including sulfamethoxazole (SMX) and methylene blue (MB) as compared to that of pristine TiO2 NAEs, which can be attributed to the synergistic effect of heterostructures with strong interfacial interaction and abundant 1D nanotube array structures to facilitate efficient spatial charge separation and interfacial transfers...
September 18, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Xiaofeng Shen, Linlin Song, Li Luo, Yan Zhang, Bo Zhu, Jianshe Liu, Zhigang Chen, Lisha Zhang
C3 N4 -decorated carbon-fiber (CF) cloth has been demonstrated as flexible filter-membrane-shaped photocatalyst for degrading the flowing wastewater, but its photocatalytic activity should be further improved. To enhance the separation efficiency of photogenerated carrier, herein we inserted TiO2 between C3 N4 and CF. With CF cloth as the substrate, the in-situ growth of TiO2 nanoparticles (diameter: 100-200 nm) was realized by a dip-coating/hydrothermal method; and C3 N4 nanosheets (thickness: 30-50 nm) were prepared on their surface by thermal polymerization...
December 15, 2018: Journal of Colloid and Interface Science
Sarah Glass, Betsy Trinklein, Bernd Abel, Agnes Schulze
The replacement of potentially toxic photoinitiators is of increasing interest regarding the synthesis of biomaterials by photopolymerization. Therefore, we present a new method for the preparation of UV polymerized hydrogels with TiO2 as a photoinitiator. Titania is known to be an excellent photoactive compound which is non-toxic, inert, and cheap. The so-formed hydrogels possess excellent mechanical properties, a high swelling ratio, and high thermal stability. Furthermore, no TiO2 is released from the hydrogels...
2018: Frontiers in Chemistry
Tong Zhang, Ning Ma, Asghar Ali, Qin Wei, Dan Wu, Xiang Ren
The accurate and rapid detection of cardiac troponin I (cTnI) at an early stage can prevent people from getting acute myocardial infarction to a great extent. Here, an ultrasensitive sandwich-type electrochemical immunosensor for the quantitative detection of cTnI is designed based on a novel signal amplification strategy. Gold nanoparticles (Au NPs) doped covalent organic frameworks (COFs) and electron mediator toluidine blue (TB-Au-COFs) behave as labels for achieving signal amplification. Note that polypyrrole modified titanium dioxide nanoparticles (TiO2 -PPy) with a high electronic conductivity and a large specific surface area can promote the performance of the immunosensor...
November 15, 2018: Biosensors & Bioelectronics
Xianbin Zhang, Hanna Tiainen, Håvard J Haugen
TiO2 scaffolds have previously shown to have promising osteoconductive properties in previous in vivo experiments. Appropriate mechanical stimuli can further promote this osteoconductive behaviour. However, the complex mechanical environment and the mechanical stimuli enhancing bone regeneration for porous bioceramics have not yet been fully elucidated. This paper aims to compare and evaluate mechanical environment of TiO2 scaffold with three commercial CaP biomaterials, i.e. Bio-Oss, Cerabone and Maxresorb under simulated perfusion culture conditions...
August 16, 2018: Medical & Biological Engineering & Computing
Chentao Hou, Wenli Liu
TiO2 /TiOF2 nanohybrids were quickly synthesized through a hydrothermal process using titanium n-butoxide (TBOT), ethanol (C2 H5 OH) and hydrofluoric acid as precursors. The prepared nanohybrids underwent additional NaOH treatment (OH-TiO2 /TiOF2 ) to enhance their photocatalytic performance. In this paper, the mechanism of NaOH affecting the pathway of transformation from TBOT (Ti precursor) to TiO2 nanosheets was discussed. The synthesized TiO2 /TiOF2 and OH-TiO2 /TiOF2 were characterized by field emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HRTEM), X-ray diffraction pattern (XRD), Fourier infrared spectroscopic analysis (FT-IR), Photoluminescence (PL) emission spectra and UV-visible diffuse reflection spectra (UV-vis DRS)...
June 2018: Royal Society Open Science
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