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Ag TiO2

Alka Tiwari, Alok Shukla, Lalliansanga, Diwakar Tiwari, Seung Mok Lee
The aim of this communication is to synthesize novel Nanocomposite thin film materials (Ag0 (NP)/TiO2 ) using the template process. Surface morphology of materials was obtained by the Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) analyses. The presence of doped Ag-nanoparticles was confirmed by the TEM images along with the SEM-EDX analyses. The Atomic Force Microscopic images were demonstrated the surface roughness and thickness of Nanocomposite thin films. X-ray diffraction analysis confirmed that TiO2 was predominantly present to its anatase mineral phase...
May 15, 2018: Journal of Environmental Management
Ahmed M Youssef, Samah M El-Sayed
Bionanocomposites materials open a chance for the usage of novel, high performance, lightweight, and ecofriendly composite materials making them take place the traditional non-biodegradable plastic packaging materials. Biopolymers like polysaccharides such as chitosan (CS), carboxymethyl cellulose (CMC), starch and cellophane could be used to resolve environmental hazards owing to their biodegradability and non-toxicity. In addition these advantages, polysaccharides have some disadvantages for example poor mechanical properties and low resistance to water...
August 1, 2018: Carbohydrate Polymers
Saraschandra Naraginti, Yi Li, Gianluca Li Puma
The photodegradation and phytotoxicity of the pharmaceutical antibiotic, sulphamethoxazole (SMX) and the azo-dye reactive-red-194 (RR194) under visible-light irradiation of TiO2 nanoparticles modified by silver and zirconium was investigated. The results indicated that sulphamethoxazole and its toxic degradation by product, 3-amino-5-methylisoxazole and RR-194 could be degraded efficiently by the co-doped Zr/Ag-TiO2 catalyst. PL studies and ROS generation results suggested that the effective charge separation was carried out while irradiation of the modified TiO2 nanoparticles...
May 14, 2018: Ecotoxicology and Environmental Safety
Ziyang Wang, Yan Wang, Cong Yu, Yanxia Zhao, Meixia Fan, Baoyu Gao
In this study, a modified sodium alginate (MSA) composited with TiCl4 was used to treat the synthetic Ag nanoparticles (AgNPs) water in coagulation-ultrafiltration process. The floc properties and membrane fouling of TiCl4 and MSA composite coagulants (TiCl4 + MSA) were investigated by a laser diffraction instrument and ultrafiltration fouling model. The recycle of the AgNP-containing flocs was evaluated by XRD and photocatalytic experiments. The results showed that TiCl4 + MSA could achieve better coagulation performance than TiCl4 alone with AgNP and DOC removal up to 97 and 59% at the optimum condition (pH = 5 and dosage = 12 mg TiCl4 /L)...
May 16, 2018: Environmental Science and Pollution Research International
Yong Huang, Guiqin Song, Xiaotong Chang, Zhenhui Wang, Xuejiao Zhang, Shuguang Han, Zhuobin Su, Hejie Yang, Dongdong Yang, Xiaojun Zhang
Background: Poor mechanical properties, undesirable fast dissolution rate, and lack of antibacterial activity limit the application of hydroxyapatite (HA) as an implant coating material. To overcome these limitations, a hybrid coating of Ag+ -substituted fluorhydroxyapatite and titania nanotube (TNT) was prepared. Methods: The incorporation of silver into the HA-TiO2 hybrid coating improves its antimicrobial properties. The addition of F as a second binary element increases the structural stability of the coating...
2018: International Journal of Nanomedicine
Shuai Chen, Wei-Hui Fang, Lei Zhang, Jian Zhang
For the first time, multimetallic clusters of noble metals have been successfully stabilized by Ti-oxo clusters. Two unprecedented Ag6@Ti16-oxo nanoclusters with precise atomic structures were prepared and characterized. The octahedral Ag6 core represents strong Ag-Ag bonds (-2.7 Å), which is further stabilized by direct Ag-O-Ti coordination interactions. Moreover, due to different acidic/redox conditions in synthesis, the Ag6 core can adopt diverse geometric configurations inside the Ti16-O shell. Correspondingly, such structural difference has greatly influenced their optical limiting effects...
May 14, 2018: Angewandte Chemie
Fabio Polesel, Julia Farkas, Marianne Kjos, Patricia Almeida Carvalho, Xavier Flores-Alsina, Krist V Gernaey, Steffen Foss Hansen, Benedek Gy Plósz, Andy M Booth
Due to their widespread application in consumer products, elemental titanium (e.g., titanium dioxide, TiO2 ) and silver (Ag), also in nanoparticulate form, are increasingly released from households and industrial facilities to urban wastewater treatment plants (WWTPs). A seven-day sampling campaign was conducted in two full-scale WWTPs in Trondheim (Norway) employing only primary treatment. We assessed the occurrence and elimination of Ti and Ag, and conducted size-based fractionation using sequential filtration of influent samples to separate particulate, colloidal and dissolved fractions...
April 30, 2018: Water Research
Yi Cao, Yu Gong, Wenzhen Liao, Yunfeng Luo, Chaohua Wu, Maolin Wang, Qianyu Yang
To ensure the safe use of nanoparticles (NPs) in modern society, it is necessary and urgent to assess the potential toxicity of NPs. Cardiovascular system is required for the systemic distribution of NPs entering circulation. Therefore, the adverse cardiovascular effects of NPs have gained extensive research interests. Metal based NPs, such as TiO2 , ZnO and Ag NPs, are among the most popular NPs found in commercially available products. They may also have potential applications in biomedicine, which could increase their contact with cardiovascular systems...
May 10, 2018: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
Seungkuk Ahn, Herdeline Ann M Ardoña, Johan U Lind, Feyisayo Eweje, Sean L Kim, Grant M Gonzalez, Qihan Liu, John F Zimmerman, Georgios Pyrgiotakis, Zhenyuan Zhang, Juan Beltran-Huarac, Paul Carpinone, Brij M Moudgil, Philip Demokritou, Kevin Kit Parker
Due to the unique physicochemical properties exhibited by materials with nanoscale dimensions, there is currently a continuous increase in the number of engineered nanomaterials (ENMs) used in consumer goods. However, several reports associate ENM exposure to negative health outcomes such as cardiovascular diseases. Therefore, understanding the pathological consequences of ENM exposure represents an important challenge, requiring model systems that can provide mechanistic insights across different levels of ENM-based toxicity...
May 10, 2018: Analytical and Bioanalytical Chemistry
Kalyan C Goddeti, Changhwan Lee, Young Keun Lee, Jeong Young Park
Titanium dioxide (TiO2 ) nanotubes with vertically aligned array structures show substantial advantages in solar cells as an electron transport material that offers a large surface area where charges travel linearly along the nanotubes. Integrating this one-dimensional semiconductor material with plasmonic metals to create a three-dimensional plasmonic nanodiode can influence solar energy conversion by utilizing the generated hot electrons. Here, we devised plasmonic Au/TiO2 and Ag/TiO2 nanodiode architectures composed of TiO2 nanotube arrays for enhanced photon absorption, and for the subsequent generation and capture of hot carriers...
May 9, 2018: Scientific Reports
Lung-Chien Chen, Kuan-Lin Lee, Wen-Ti Wu, Chien-Feng Hsu, Zong-Liang Tseng, Xiao Hong Sun, Yu-Ting Kao
In this study, the perovskite layers were prepared by two-step wet process with different CH3 NH3 I (MAI) concentrations. The cell structure was glass/FTO/TiO2 -mesoporous/CH3 NH3 PbI3 (MAPbI3 )/spiro-OMeTAD/Ag. The MAPbI3 perovskite films were prepared using high and low MAI concentrations in a two-step process. The perovskite films were optimized at different spin coating speed and different annealing temperatures to enhance the power conversion efficiency (PCE) of perovskite solar cells. The PCE of the resulting device based on the different perovskite morphologies was discussed...
May 8, 2018: Nanoscale Research Letters
Xiang Wu, Wei Wang, Lizhong Zhu
The mechanism of enhanced accumulation of organic contaminants in crops with engineered nanomaterials (ENMs) were investigated by co-exposure of crops (Ipomoea aquatica Forsk (Swamp morning-glory), Cucumis sativus L. (cucumber), Zea mays L. (corn), Spinacia oleracea L. (spinach) and Cucurbita moschata (pumpkin))to a range of chemicals (polycyclic aromatic hydrocarbons (PAHs), organochlorine pesticides (OCPs) and polybrominated diphenyl ether (PBDE)) and ENMs (TiO2 , Ag, Al2 O3 , graphene, carbon nanotubes (CNTs)) in soil...
May 2, 2018: Environmental Pollution
Ying Zhang, Juanrong Chen, Hua Tang, Yingguan Xiao, Shoufei Qiu, Songjun Li, Shunsheng Cao
A new protocol for constructing sandwich-like SiO2 -Ag@TiO2 hollow spheres (SAT) is introduced, in which SiO2 acts as an efficient support for the Ag nanoparticles (Ag NPs) immobilization, while TiO2 maintains its hierarchical structure and prevents the aggregation of Ag NPs during the photocatalytic reaction. As a photocatalytic agent, the inner and outer surfaces of TiO2 can be fully occupied by pollutants molecules because of its unique structure, which faster boosts the photo-generated electrons to transfer the substrates, leading to an enhanced photocatalytic performance...
April 22, 2018: Journal of Hazardous Materials
Nannan Liu, Huan Yi, Yanyu Lin, Hongli Zheng, Xiangqing Zheng, Danmei Lin, Hong Dai
A dual-responsive sandwich-type immunosensor is described for the detection of interleukin 6 (IL-6) by combining electrochemiluminescent (ECL) and electrochemical (EC) detection based on the use of two kinds of TiO2 mesocrystal nanoarchitectures. A composite was prepared from TiO2 (anatase) mesocages (AMCs) and a carboxy-terminated ionic liquid (CTIL) and then placed on a glassy carbon electrode (GCE). In the next step, the ECL probe Ru(bpy)3 (II) and antibody against IL-6 (Ab1 ) were immobilized on the GCE...
May 2, 2018: Mikrochimica Acta
Agata Roguska, Anna Belcarz, Justyna Zalewska, Marcin Holdynski, Mariusz Andrzejczuk, Marcin Pisarek, Grazyna Ginalska
Titanium oxide nanotubes layers with silver and zinc nanoparticles are attracting increasing attention in the design of bone and dental implants, due to their antimicrobial potential and their ability to control host cell adhesion, growth and differentiation. However, recent reports indicate that the etiology of dental infections is more complex than has been previously considered. Therefore, the antimicrobial potential of dental implants should be evaluated against at least several different microorganisms cooperating in human mouth colonization...
May 2, 2018: ACS Applied Materials & Interfaces
M A Nadeem, H Idriss
Photo-thermal catalytic reactions of ethanol over Ag/TiO2 were conducted in order to probe into the role of plasmonic resonance response in the reaction kinetics. In the 300-500 K temperature domain the increase in reaction rate is found to be mainly due to changes in the activation energy while above this temperature range the increase was due to the pre-exponential factor. These results might be linked to the role of plasmonic Ag particles in polarising the reaction intermediates and therefore increasing the reaction products at temperatures up to about 500 K...
May 2, 2018: Chemical Communications: Chem Comm
Juan Matos, Biviana Llano, Ricmary Montaña, Po S Poon, Maria C Hidalgo
The design of hybrid mesoporous TiO2 -SiO2 (TS1) materials decorated with Ag and Pt nanoparticles was performed. The photocatalytic degradation of phenol under artificial solar irradiation was studied and the activity and selectivity of the intermediate products were verified. TiO2 -SiO2 was prepared by sol-gel method while Ag- and Pt-based photocatalysts (TS1-Ag and TS1-Pt) were prepared by photodeposition of the noble metals on TS1. Two series of photocatalysts were prepared varying Ag and Pt contents (0...
May 1, 2018: Environmental Science and Pollution Research International
Shengxin Weng, Xu Zhao, Guomin Liu, Yuefeng Guan, Fanglong Wu, Yungang Luo
Postoperative infection associated with medical implants is a devastating complication of orthopedic surgery. Considering the difficulties for the diagnosis and treatment of infection, coating the implant material with antibacterial substances is a promising protocol by which to avoid such an adverse reaction. Nanoparticles (NPs) constructed of anatase microspheres, one form of titanium dioxide (TiO2 ), with a high specific surface area are fabricated in this study in a facile one-step process using homogeneous precipitation at 90 °C under atmospheric pressure using titanium sulfate (Ti[SO4 ]2 ) and urea as the titanium source and precipitant, respectively...
April 23, 2018: Journal of Materials Science. Materials in Medicine
S Saran, P Arunkumar, G Manjari, S P Devipriya
Application of pilot scale slurry type tubular photocatalytic reactor was tested for the decentralized treatment of actual grey water. The reactors were fabricated by reusing the locally available materials at low cost, operated in batch recycle mode with 25L of grey water. The influence of operational parameters such as catalysts concentration, initial slurry pH and addition of H2 O2 on COD abatement were optimized. The results illustrate that, Ag decorated TiO2 shows two-fold increase in COD abatement than pure TiO2 ...
April 23, 2018: Environmental Technology
Kang-Pil Kim, Dae-Kue Hwang, Sung-Ho Woo, Dae-Hwan Kim
The Ag nanowire (NW) + Au nanoparticle (NP)-embedded TiO2 photoelectrodes were adopted for conventional planar TiO2-based Sb2S3 hybrid solar cells to improve the cell efficiency. Compared to conventional planar TiO2-based Sb2S3 hybrid solar cells, the Ag NW + Au NP/TiO2-based Sb2S3 hybrid solar cells exhibited an improvement of approximately 40% in the cell efficiency due to the significant increase in both Jsc and Voc. These enhanced Jsc and Voc were attributed to the increased surface area, charge-collection efficiency, and light absorption by embedding the Ag NWs + Au NPs composite...
September 1, 2018: Journal of Nanoscience and Nanotechnology
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