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Blue TiO2

Lucila I Doumic, Micaela Génova, Gregor Žerjav, Albin Pintar, Miryan C Cassanello, Hernán E Romeo, María A Ayude
A novel hierarchically structured composite aimed as a stable catalyst for the heterogeneous Fenton-type (HFT) oxidation process was developed by using a cost-effective and versatile technique. Prussian Blue nanoparticles (PBNP) were dispersed onto aligned macroporous TiO2 (rutile) monoliths prepared via directional freezing of aqueous dispersions of TiO2 nanoparticles. The catalytic performance was evaluated in the HFT oxidation of an azo dye frequently used as a model contaminant, Orange G (OG). Experiments were carried out in a liquid batch-recycle reactor, in which the liquid flow rate was set to ensure negligible external mass transfer resistance...
February 13, 2019: Journal of Environmental Management
Henry H Mungondori, Spencer Ramujana, David M Katwire, Raymond T Taziwa
This work investigates the preparation of a magnetically recoverable photocatalytic nanocomposite of maghemite nanoparticles coated with silica and carbon doped titanium dioxide. The novel nanocomposite boasts the advantages of efficient photocatalytic degradation of organic pollutants in water and ease of recovery of the fine particles after water treatment. The photocatalytic nanocomposite was successfully synthesized through a stepwise approach via co-precipitation and sol-gel methods. Characterisation by Fourier transform infrared (FTIR), X-ray diffraction (XRD), transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS) substantiated the existence of the intended structure of the nanocomposite and the particles were found to be in the size range of 15-22 nm with a quasi-spherical shape...
December 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Pawan Kumar, Ehsan Vahidzadeh, Ujwal Kumar Thakur, Piyush Kar, Kazi Mohammad Alam, Ankur Goswami, Najia Mahdi, Kai Cui, Guy M Bernard, Vladimir K Michaelis, Karthik Shankar
Modification of carbon nitride based polymeric 2D materials for tailoring their optical, electronic and chemical properties for various applications has gained significant interest. The present report demonstrates the synthesis of a novel modified carbon nitride framework with a remarkable 3:5 C:N stoichiometry (C3N5) and an electronic bandgap of 1.76 eV, by thermal deammoniation of melem hydrazine precursor. Characterization revealed that in C3N5 polymer, two s-heptazine units are bridged together with azo linkage, which constitutes an entirely new and different bonding fashion from g-C3N4 where three heptazine units are linked together with tertiary nitrogen...
February 14, 2019: Journal of the American Chemical Society
Dong Li, Simeng Hao, Guanjie Xing, Yunchao Li, Xiaohong Li, Louzhen Fan, Shihe Yang
As crystalline semiconductor nanowires are thinned down to a single-unit-cell thickness, many fascinating properties could arise pointing to promising applications in various fields. A grand challenge is to be able to controllably synthesize such ultrathin nanowires. Herein we report a strategy, which synergizes soft template with oriented attachment (ST-OA), to prepare high-quality single-unit-cell semiconductor nanowires (SSNWs). Using this protocol, we are able to synthesize for the first time ZnS and ZnSe nanowires (NWs) with only a single-unit-cell thickness (less than 1...
February 4, 2019: Journal of the American Chemical Society
Marlene Pradenas, Jorge Yáñez, Suresh Ranganathan, David Contreras, Paola Santander, Héctor D Mansilla
The photocatalytic activity of hydrogenated TiO2 was evaluated in the photooxidation of methyl orange (MO). The hydrogenation of TiO2 was carried out by calcination of a mixture of TiO2 P-25 and NaBH4 , at 300 and 350°C for blue TiO2 and black TiO2 , respectively. An experimental design was made for the determination of the best reaction conditions for the oxidation of MO. The influence of catalyst dosage and pH on photocatalytic efficiency was optimized, and the degradation percentage of MO was the response factor...
October 26, 2018: Water Environment Research: a Research Publication of the Water Environment Federation
Li Ma, Yilin Liu, Yi Liu, Shuyi Jiang, Ping Li, Yuchen Hao, Pengpeng Shao, Anxiang Yin, Xiao Feng, Bo Wang
Conjugated microporous polymers (CMPs) have full access to the organic synthesis toolbox and feature-rich functionality, structural diversity, and high surface area. We incorporated ferrocene (Fc) into the backbones of CMPs and systematically engineered their optical energy gaps. Compared with the CMPs without Fc units yet adopting similar molecular orbital level, Fc-based CMPs can sufficiently generate reactive oxygen species (ROS) under visible light. The resultant ROS are able to effectively decompose the absorbed pollutants, including organic dyes and chemical warfare agents...
January 29, 2019: Angewandte Chemie
Ali Balati, Sumeyra Tek, Kelly Nash, Heather Shipley
Different morphologies and crystal phases of black titanium dioxide (TiO2 ) were synthesized using Pulsed Laser Ablation in Liquid (PLAL). The synthesized laser modified black TiO2 (LMB-TiO2 ) structures included hydrogenated anatase TiO2 nanoparticles, as the core shell structures, and TiO2 microspheres. TiO2 core-shell nanoparticles, which had crystalline-disordered structures, demonstrated the laser ablation pulse duration-dependence growth of amorphous shells and hence formation of disordered TiO2 nanoparticles with different thickness of hydrogen-doped amorphous shells were shown...
January 22, 2019: Journal of Colloid and Interface Science
Zhiwei Huang, Robert S Gurney, Yalun Wang, Wenjiao Han, Tao Wang, Dan Liu
Durability under UV illumination remains as a big challenge of TiO2-based superhydrophobic coatings, with the photocatalytic effect causing degradation of low surface energy material over time resulting in surfaces losing their hydrophobicity. We report surfaces made from tolylene-2, 4-diisocyanate (TDI)/TiO2 hybrid networks that demonstrate superhydrophobicity and superior UV-durability. Structural and morphological studies reveal that the TDI/TiO2 hybrid networks are composed of TiO2 nanoparticles interconnected with TDI bridges, and then encapsulated by a TDI layer...
January 25, 2019: ACS Applied Materials & Interfaces
Md Manik Mian, Guijian Liu, Balal Yousaf, Biao Fu, Rafay Ahmed, Qumber Abbas, Mehr Ahmed Mujtaba Munir, Liu Ruijia
A series of new biochar-supported composite based on the combination of biochar and metallic nanoparticles (NPs) were produced through single-step pyrolysis of FeCl3 -Ti(OBu)4 laden agar biomass under NH3 environment. The physiochemical properties of composites were characterized thoroughly. It has found that heating temperature and N-doping through NH3 -ambiance pyrolysis significantly influence the visible-light sensitivity and bandgap energy of composites. The catalytic activities of composites were measured by degradation of Methylene Blue (MB) in the presence or absence of H2 O2 and visible-light irradiation...
April 2019: Journal of Environmental Sciences (China)
Qingfu Guo, Jingjing Li, Bin Zhang, Guangming Nie, Debao Wang
A difunctional porous network poly(indole-6-carboxylicacid) (PICA)/TiO2 nanocomposite is firstly prepared using TiO2 nanorod arrays as scaffold. Because of the synergistic effect of PICA and TiO2, the nanocomposite shows good electrochemical performance, high specific capacitance value (23.34 mF cm-2) and excellent galvanostatic charge and discharge stability. Meanwhile, this nanocomposite can be reversibly switched among yellow, green, brown with high coloration efficiency (124 cm2 C-1). An asymmetric electrochromic-supercapacitor device (ESD) is also constructed using PICA/TiO2 nanocomposite as anode material and poly(3,4-ethylenedioxythiophene) (PEDOT) as cathode material...
January 22, 2019: ACS Applied Materials & Interfaces
Qiang-Qiang Zhang, Ying-Jie Zhu, Jin Wu, Yue-Ting Shao, An-Yong Cai, Li-Ying Dong
A new kind of environmentally friendly filter paper based on ultralong hydroxyapatite nanowires (HAPNWs) and cellulose fibers (CFs) with excellent filtration and adsorption properties has been developed for the application in high-performance water purification. The use of polyamidoamine-epichlorohydrin (PAE) resin increases the wet mechanical strength of the as-prepared HAPNW/CF filter paper. The addition of CFs enhances the mechanical strength of the HAPNW/CF filter paper. Owing to the porous structure and superhydrophilicity of the as-prepared HAPNW/CF filter paper, the pure water flux is as high as 287...
January 18, 2019: ACS Applied Materials & Interfaces
Jorge Rodríguez-Chueca, Esther Alonso, Devendra Narain Singh
Industrial activity is one of the most important sources of water pollution. Yearly, tons of non-biodegradable organic pollutants are discharged, at the least, to wastewater treatment plants. However, biological conventional treatments are unable to degrade them. This research assesses the efficiency of photocatalytic activation of peroxymonosulfate (PMS) by two different iron species (FeSO₄ and Fe3+ -citrate) and TiO₂. These substances accelerate methylene blue removal by the generation of hydroxyl and sulfate radicals...
January 11, 2019: International Journal of Environmental Research and Public Health
Sumaiya Parveen, Kamal Kumar Paul, Ruma Das, P K Giri
Herein, we demonstrated a novel synthetic route to grow size-tunable hybrid perovskite (CH3 NH3 PbI3 and CH3 NH3 PbBr3 ) quantum dots (QDs) using a Fluorine-doped TiO2 (F-TiO2 ) mesoporous template and these QDs exhibit large exciton binding energy, high photoluminescence quantum yield and improved photostability. The pore size in F-TiO2 template is tuned by varying the HF molar concentration during its solvothermal growth and size of the perovskite QDs embedded in F-TiO2 pores is tuned in the range 1.7-5.1 nm, as revealed from the TEM analysis...
December 31, 2018: Journal of Colloid and Interface Science
Marion Barthomeuf, Xavier Castel, Laurent Le Gendre, Justine Louis, Martine Denis, Christine Pissavin
Structural, microstructural and bactericidal surface properties of TiO2 -coated glass substrates elaborated by reactive RF-sputtering are investigated. As pathogenic bacteria in biofilms are a major concern in food industries due to their growing resistance to cleaning and sanitizing procedures, the development of photoactive surfaces exhibiting bactericidal properties is acknowledged as an effective approach to tackle bacterial contaminations. Our principal aim concerns the study of the photoactive top-layer thickness impact (from 80 nm to ~500 nm) on Listeria monocytogenes...
December 28, 2018: Photochemistry and Photobiology
Kuen-Chan Lee, Yi-Lun Chen, Chien-Chen Wang, Jen-Hsien Huang, Er-Chieh Cho
Titanium dioxide nanomaterials have good capability to prevent human cells from damage under UV irradiation. However, some studies indicated that the nanoscale of titanium dioxide could potentially cause harmful effects such as free radicals generation under UV irradiation and thereby accelerate the progress of cell aging. Fullerenes can scavenge large amounts of free radicals due to the fact that fullerenes contain enormous amount of π electrons with low lying lowest unoccupied molecular orbital (LUMO), but its adverse properties, such as the poor solubility in water, restricted the applicability...
December 12, 2018: ACS Applied Materials & Interfaces
Ying-Ying Huang, Paweł J Rajda, Grzegorz Szewczyk, Brijesh Bhayana, Long Y Chiang, Tadeusz Sarna, Michael R Hamblin
We have recently shown that a wide range of different inorganic salts can potentiate antimicrobial photodynamic inactivation (aPDI) and TiO2-mediated antimicrobial photocatalysis. Potentiation has been shown with azide, bromide, thiocyanate, selenocyanate, and most strongly, with iodide. Here we show that sodium nitrite can also potentiate broad-spectrum aPDI killing of Gram-positive MRSA and Gram-negative Escherichia coli bacteria. Literature reports have previously shown that two photosensitizers (PS), methylene blue (MB) and riboflavin, when excited by broad-band light in the presence of nitrite could lead to tyrosine nitration...
December 11, 2018: Photochemical & Photobiological Sciences
Yalian Weng, Guixiong Chen, Xiongtu Zhou, Qun Frank Yan, Tailiang Guo, Yongai Zhang
Bi-functional thin film with both selected light extraction and reliable moisture vapor barrier was proposed for simultaneous light management and encapsulation in the fields of lighting and display. Atomic layer deposition (ALD) was employed to obtain TiO2 and Al2O3 films with high uniformity, forming distributed Bragg reflector (DBR) structure. The DBRs exhibited excellent and tunable optical properties, as well as reliable moisture barrier performance. With increasing the DBR layers, the transmittances decreased obviously...
November 29, 2018: Nanotechnology
Marla Cuppini, Vicente Castelo Branco Leitune, Marcela de Souza, Annelise Kopp Alves, Susana Maria Werner Samuel, Fabrício Mezzomo Collares
The evaluation of the photocatalysis of visible light activated titanium dioxide employed in hydrogen peroxide (H2 O2 ) was carried using seven H2 O2 solutions (3.5 and 35%) and/or methylene blue (MB), with or without light irradiation (LI); the absorbance of MB was the bleaching indicator. Color analysis was performed on bovine teeth (n=12) using two different concentrations of H2 O2 , 6 and 35% associated with titanium dioxide (TiO2 ). Data were analyzed with one and two-way ANOVA, and significance level of p<0...
November 17, 2018: Dental Materials Journal
Jesús A Díaz-Real, Geyla C Dubed-Bandomo, Juan Galindo-de-la-Rosa, Luis G Arriaga, Janet Ledesma-García, Nicolas Alonso-Vante
Titanium oxide nanotubes (TNTs) were anodically grown in ethylene glycol electrolyte. The influence of the anodization time on their physicochemical and photoelectrochemical properties was evaluated. Concomitant with the anodization time, the NT length, fluorine content, and capacitance of the space charge region increased, affecting the opto-electronic properties (bandgap, bathochromic shift, band-edge position) and surface hydrophilicity of TiO2 NTs. These properties are at the origin of the photocatalytic activity (PCA), as proved with the photooxidation of methylene blue...
2018: Beilstein Journal of Nanotechnology
C Dazon, B Maxit, O Witschger
Nanomaterial powders and colloids are already a large industry and are expected to continue to grow rapidly. In the context of risk assessment associated with nanomaterials, characterization of nanoparticle size and morphology is required. Until now, the best method giving direct access to these parameters has been electron microscopy (EM), in particular, transmission electron microscopy (TEM). Although this method is widely used, several issues are highlighted such as cost, maintenance, sample representativity and damage for sensitive materials...
September 15, 2018: Micron: the International Research and Review Journal for Microscopy
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