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Zhangjian Chen, Yun Wang, Xiang Wang, Lin Zhuo, Shi Chen, Shichuan Tang, Lin Zhao, Xianguo Luan, Guang Jia
As food additives, titanium dioxide nanoparticles (TiO2 NPs) have been widely used in various products that are usually simultaneously consumed with a high content of sugar, thus necessitating research on the effect of TiO2 NPs on glucose homeostasis. We conducted an animal study to explore the effect of orally administrated TiO2 NPs on glucose absorption and metabolism in rats at 0, 2, 10 and 50 mg kg-1 body weight day-1 for 30 and 90 days. The results showed that oral exposure to TiO2 NPs caused a slight and temporary hypoglycemic effect in rats at 30 days post-exposure but recovered at 90 days post-exposure...
January 19, 2018: Journal of Applied Toxicology: JAT
J Batt, M Milward, I Chapple, M Grant, H Roberts, O Addison
The interaction between TiO2 nanoparticles (NPs) and inflammatory cytokines, including CXCL8, a clinically relevant pro-inflammatory chemokine was investigated. TiO2 is present in tissues adjacent to failing implanted Ti (titanium) devices. TiO2 NPs were shown to bind to CXCL8 in vitro, causing perturbation of quantification of CXCL8 by ELISA, in both simple and complex protein panels, in a dose-dependent manner. Binding between TiO2 NPs and CXCL8 was demonstrated by protein gel electrophoresis. TiO2 NPs were also shown to inactivate the chemoattractant property of CXCL8 in a dose-dependent manner, suggesting that the binding between TiO2 NPs and CXCL8 is likely to be clinically relevant...
January 19, 2018: European Cells & Materials
Pu Yuan, Dongkui Song
To reduce the side effects of chemotherapy and reach effective and safe therapy of prostate cancer, herein, a simple but multifunctional system TiO2:Gd@DOX/FA motivated by ultrasound was developed for MRI guided multi-mechanism therapy of prostate cancer. TiO2 nanoparticles served as a sonosensitizer as well as a nanocarrier with pH-responsive release of DOX. Doping of Gd could not only endow TiO2 the ability of magnetic resonance imaging (MRI), but also further improve sonodynamic ability of TiO2. The characterization revealed the as-prepared TiO2:Gd@DOX/FA showed sensitive pH-responsive drug release, high ROS production, T1-MRI contrast performance and excellent biocompatibility...
January 19, 2018: Nanotechnology
Anu Mishra, Bhupendra Singh Butola
In this article, the deposition of TiO2 on cotton fabric using sol-gel techniques has been described. Various process routes (pad-dry-cure, pad-dry-hydrothermal and pad-dry-solvothermal) were examined to impart a stable coating of TiO2 on fabric. The role of pre-cursor concentration, process temperature and time of treatment were studied to aim at a wash durable, UV protective and self-cleaning property in the treated fabric. EDX and ICP-MS techniques were used to examine the add-on % of TiO2 on cotton fabrics treated via different routes...
January 19, 2018: Photochemistry and Photobiology
Hongcai He, Zhuolin Jiang, Zhaoling He, Tao Liu, Enzhu Li, Bao-Wen Li
An excellent ternary composite photocatalyst consisting of silver orthophosphate (Ag3PO4), attapulgite (ATP), and TiO2 was synthesized, in which heterojunction was formed between dissimilar semiconductors to promote the separation of photo-generated charges. The ATP/TiO2/Ag3PO4 composite was characterized by SEM, XRD, and UV-vis diffuse reflectance spectroscopy. The co-deposition of Ag3PO4 and TiO2 nanoparticles onto the surface of ATP forms a lath-particle structure. Compared with composite photocatalysts consisting of two phases, ATP/TiO2/Ag3PO4 ternary composite exhibits greatly improved photocatalytic activity for degradation of rhodamine B under simulated solar irradiation...
January 18, 2018: Nanoscale Research Letters
Zhiyuan Xu, Jingjing Shi, Muhammad Sohail Haroone, Wenpeng Chen, Shufang Zheng, Jun Lu
Due to the superiority of metal-doped ZnO compared to TiO2, the Zn-M (M = Al3+, Ga3+, Cr3+, Ti4+, Ce4+) mixed metal oxide solid solutions have been extensively studied for photocatalytic and photovoltaic applications. In this work, a systematic research has proceeded for the preparation of a zinc-aluminum oxide semiconductor as a photoanode for the dye-sensitized solar cells (DSSCs) by a simple pyrolysis route with the Zn-Al layered double hydroxide (LDH) as a precursor. The Zn-Al oxide solid solution has been applied for DSSCs as an electron acceptor, which is used to study the influence of different Al content and sintering temperature on the device efficiency...
January 10, 2018: Journal of Colloid and Interface Science
H Puttaiah Shivaraju, Henok Egumbo, P Madhusudan, K M Anil Kumar, G Midhun
In the present study, affordable clay-based ceramic filters with multi-functional properties were prepared using low-cost and active ingredients. The characterization results of as-prepared materials clearly revealed well crystallinity, structural elucidation, extensive porosity, higher surface area, higher stability, and durability which apparently enhance the treatment efficiency. The filtration rates of ceramic filter were evaluated under gravity and the results obtained were compared with typical gravity slow sand filter...
January 18, 2018: Environmental Technology
Ayrton F Martins, Daiane S da Silva, Alma C C Mejía, José E B Bravo
The main objective of this study was to determine the occurrence of polycyclic aromatic hydrocarbons (PAHs) in surface water samples collected from different points along the stream that flows through the Campus of the Federal University of Santa Maria, RS-Brazil. Before reaching the campus, the water in the stream is already contaminated by wastewater discharged from the surrounding, and once inside the Campus, additional wastewater from a Gas Station situated close to the University hospital. A bench scale photodegradation experiment was conducted of the occurring traces of anthracene, phenanthrene and naphthalene, with the aid of a stirred tank reactor and polymer-supported TiO2 as a catalyst...
January 18, 2018: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
Margarida Castro, Verónica Nogueira, Isabel Lopes, Maria N Vieira, Teresa Rocha-Santos, Ruth Pereira
This study aimed to explore the efficiency of two adsorbents, cork granules with different granulometry and titanium dioxide nanomaterial, in the removal of chemical oxygen demand (COD), colour and toxicity from a textile effluent. The adsorption assays with cork were unsatisfactory in the removal of chemical parameters however they eliminated the acute toxicity of the raw effluent to Daphnia magna. The assay with TiO2 NM did not prove to be efficient in the removal of colour and COD even after 240 min of contact; nevertheless it also reduced the raw effluent toxicity...
January 18, 2018: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
Kun-Che Kao, Hiroyasu Nishi, Tetsu Tatsuma
Two-dimensional periodic Au nanoparticle arrays were constructed on TiO2 thin films by a micelle lithography method and seed-mediated photoelectrochemical growth. Their adjustable interparticle distance allows investigation of a particle size effect on plasmon-induced charge separation (PICS) efficiencies without interference from particle aggregation or plasmon coupling. External or internal PICS efficiencies were found to increase and decrease, respectively, with an increase in particle diameter from 25 to 38 nm...
January 18, 2018: Physical Chemistry Chemical Physics: PCCP
Miao Xie, Fu-Quan Bai, Jinjian Wang, Yue-Qing Zheng, Zhenyang Lin
Dye sensitizers play an important role in dye-sensitized solar cells (DSSCs). As a promising strategy for the design of novel porphyrin sensitizers, the asymmetric modification of the porphyrin ring to meso-link porphyrin sensitizer has emerged in recent years, which can improve the light-harvesting properties and enhance the electron distribution. In this work, in order to reveal the essence of the effect of unsymmetrical substitution on the performance of β-link porphyrin dyes in DSSCs, four kinds of common β-link porphyrin dyes with different structures are calculated by using density functional theory (DFT) and time-dependent density functional theory (TD-DFT)...
January 18, 2018: Physical Chemistry Chemical Physics: PCCP
Andrew B Holmes, Frank X Gu
The study of the environmental fate of nanoscale TiO2 (n-TiO2) is a major recent research focus which requires a rapid and accurate on-site concentration determination method. Inductively coupled plasma mass spectroscopy (ICP-MS) has been the most widely used method for determining the concentration of n-TiO2 in environmental samples; however, poses many challenges, such as hazardous hydrofluoric acid pre-treatment and clear limitations in mobile on-site measurement and monitoring. This study demonstrates that industrial wastewater containing natural organic matter (NOM) can present a major challenge to the analysis of n-TiO2 by ICP-MS, and introduces a spectrophotometry technique that can be used as an alternative...
January 18, 2018: Environmental Technology
Silvia Mariotti, Oliver S Hutter, Laurie J Phillips, Peter J Yates, Biswajit Kundu, Ken Durose
In this manuscript, the inorganic perovskite CsPbI2Br is investigated as a photovoltaic material that offers higher stability than the organic-inorganic hybrid perovskite materials. It is demonstrated that CsPbI2Br does not irreversibly degrade to its component salts as in the case of methylammonium lead iodide but instead is induced (by water vapor) to transform from its metastable brown cubic (1.92 eV band gap) phase to a yellow phase having a higher band gap (2.85 eV). This is easily reversed by heating to 350 °C in a dry environment...
January 18, 2018: ACS Applied Materials & Interfaces
Meng Yang, Yuezhi Zhong, Baogang Zhang, Jiaxin Shi, Xueyang Huang, Yi Xing, Lin Su, Huipeng Liu, Alistair G L Borthwick
Anode materials and structures are of critical importance for microbial fuel cells (MFCs) recovering energy from toxic substrates. Carbon-fiber-felt anodes modified by layers of vertically oriented TiO2 and Fe2O3 nanosheets respectively were applied in present study. Enhanced sulfide removal efficiencies (both over 90%) were obtained after 48 h operation, with maximum power densities improved by 1.53 and 1.36 folds compared with MFCs with raw carbon-fiber-felt anode, respectively. The modified anodes provided more active sites for microbial adhesion with increasing biomass densities...
January 18, 2018: Environmental Technology
Paul Brunet, Rocío Rincón, Zineb Matouk, Mohamed Chaker, Françoise Massines
Nanocomposite thin films formed of TiO2 in a polymer-like matrix are grown in a filamentary Argon (Ar) Dielectric Barrier Discharge (DBD) from a suspension of TiO2 nanoparticles in isopropanol (IPA). The sinusoidal voltage producing the plasma is designed to independently control the matrix growth rate and the transport of nanoparticles (NPs) aggregates to the surface. The useful FSK (Frequency Shift Keying) modulation mode is chosen to successively generate two sinusoidal voltages: a high frequency signal at 15 kHz and a low frequency signal at frequencies ranging from 0...
January 17, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Graca Bożena, Danuta Zakrzewska, Beata Szymczycha
In this study, the role of nanoparticles in complex aqueous matrices such as the Baltic Sea was investigated in batch-mode experiments in which titanium dioxide nanoparticles (nano-TiO2) were tested for their ability to remove heavy metals (Cr, Pb, Cu, Zn, Cd, Ni, Co) from multicomponent spiked and non-spiked Baltic Sea water. The experimental data were analyzed using different isotherms (Langmuir, Freundlich, Dubinin-Kaganer-Radushkevich (DKR)) and models (pseudo-first-order and pseudo-second-order models, the double-exponential model, and the Weber-Morris model)...
January 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
A Durán, J M Monteagudo, I San Martín, S Merino
The aim of this work was to evaluate the performance of a novel self-autonomous reactor technology (capable of working with solar irradiation and artificial UV light) for water treatment using aniline as model compound. This new reactor design overcomes the problems of the external mass transfer effect and the accessibility to photons occurring in traditional reaction systems. The UV-light source is located inside the rotating quartz drums (where TiO2 is immobilized), allowing light to easily reach the water and the TiO2 surface...
January 12, 2018: Journal of Environmental Management
Si Li, Jiangyong Hu
The role of natural organic matter (NOM) in contaminants removal by photolysis and photocatalysis has aroused increasing interest. However, evaluation of the influence of NOM characteristics on the transformation products (TPs) formation and transformation pathways of contaminants has rarely been performed. This study investigated the decomposition kinetics, mineralization, TPs formation and transformation pathways of antibiotic ciprofloxacin (CIP) during photolysis and photocatalysis in the presence of three commercial NOM isolates (Sigma-Aldrich humic acid (SAHA), Suwannee River humic acid (SRHA) and Suwannee River NOM (SRNOM)) by using UVA light emitting diode (UVA/LED) as an alternative light source...
January 9, 2018: Water Research
Maria Ibañez-Vea, Honggang Huang, Xabier Martinez de Morentin, Estela Perez, Maria Gato, Miren Zuazo, Hugo Arasanz, Joaquin Fernandez-Irigoyen, Enrique Santamaría, Gonzalo Fernandez-Hinojal, Martin R Larsen, David Escors, Grazyna Kochan
Protein S-nitrosylation is a cysteine post-translational modification mediated by nitric oxide. An increasing number of studies highlight S-nitrosylation as an important regulator of signaling involved in numerous cellular processes. Despite of the significant progress in the development of redox proteomic methods, identification and quantification of endogeneous S-nitrosylation using high-throughput mass spectrometry-based methods is a technical challenge as this modification is highly labile. To overcome this drawback most methods induce S-nitrosylation chemically in proteins using nitrosylating compounds before analysis, with the risk of introducing non-physiological S-nitrosylation...
January 17, 2018: Journal of Proteome Research
Hongjun Kang, Yuyan Liu, Hua Lai, Xiaoyan Yu, Zhongjun Cheng, Lei Jiang
Recently, smart interfacial materials that can reversibly transit between the superhydrophobicity and superhydrophilicity have aroused much attention. However, all present performances happen in air, and to realize such a smart transition in complex environments, such as oil, is still a challenge. Herein, TiO2 nanotube arrays with switchable transition between the superhydrophobicity and superhydrophilicity in oil are reported. The switching can be observed by alternation of UV irradiation and heating process, and the smart controllability can be ascribed to the cooperative effect between the surface nanostructures and the chemical composition variation...
January 17, 2018: ACS Nano
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