scholarly journals Microwave-Assisted Vacuum Synthesis of TiO2 Nanocrystalline Powders in One-Pot, One-Step Procedure

Nanomaterials ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 149
Author(s):  
Enrico Paradisi ◽  
Roberto Rosa ◽  
Giovanni Baldi ◽  
Valentina Dami ◽  
Andrea Cioni ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Sol Gel ◽  
Reaction Medium ◽  
Process Intensification ◽  
Nanocrystalline Powders ◽  
Fast Heating ◽  
One Pot ◽  
Nanoparticle Suspension ◽  
Step Procedure ◽  
One Step

A new method for fast and simple synthesis of crystalline TiO2 nanoparticles with photocatalytic activity was developed by carrying out a classic sol–gel reaction directly under vacuum. The use of microwaves for fast heating of the reaction medium further reduces synthesis times. When the solvent is completely removed by vacuum, the product is obtained in the form of a powder that can be easily redispersed in water to yield a stable nanoparticle suspension, exhibiting a comparable photocatalytic activity with respect to a commercial product. The present methodology can, therefore, be considered a process intensification procedure for the production of nanotitania.

scholarly journals Non-aqueous sol–gel synthesis through a low-temperature solvothermal process of anatase showing visible-light photocatalytic activity

RSC Advances ◽  
2014 ◽  
Vol 4 (87) ◽  
pp. 46762-46770 ◽  
Author(s):  
Mohamed Karmaoui ◽  
David M. Tobaldi ◽  
Andrijana Sever Skapin Andrijana Sever Skapin ◽  
Robert C. Pullar ◽  
Maria P. Seabra ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Low Temperature ◽  
Visible Light ◽  
Sol Gel ◽  
Solvothermal Process ◽  
One Pot ◽  
Visible Light Photocatalytic Activity ◽  
Sol Gel Synthesis ◽  
Visible Light Photocatalytic

A novel, facile method based on a non-aqueous sol–gel solvothermal process has been developed to synthesise spherical TiO2 nanoparticles (NPs) in one pot.

Solar Selective Properties of Electrolytically Formed Thin Layers on Aluminum

2000 ◽  
Vol 122 (2) ◽  
pp. 101-105 ◽  
Author(s):  
T. Mo¨ller ◽  
Th. Schwarz ◽  
D. Ho¨nicke
Keyword(s):  
Sol Gel ◽  
Electrochemical Process ◽  
Thin Layers ◽  
Electrical Parameters ◽  
Electrolytic Bath ◽  
Alumina Layer ◽  
Pulse Technique ◽  
Step Procedure ◽  
One Step ◽  
Enhanced Stability

A novel electrochemical process for the formation of solar selective absorber layers on aluminum is presented. The growth of an alumina layer and the incorporation of metal ions into the layer is done by a one-step procedure using only one electrolytic bath and application of a voltage pulse technique. The influence of selected electrical parameters on the solar selective properties is described and the enhanced stability of an absorber layer, attained by a sol-gel-posttreatment, is discussed. [S0199-6231(00)00602-X]

Hydrothermal Treatment and its Influence on the Structure of Phosphorous Doped Titania

2011 ◽  
Vol 287-290 ◽  
pp. 1775-1778
Author(s):  
Si Yao Guo ◽  
Feng Fei Wang ◽  
Li Jiang ◽  
Dong Po He
Keyword(s):  
Photocatalytic Activity ◽  
Hydrothermal Method ◽  
Hydrothermal Treatment ◽  
Photoelectron Spectroscopy ◽  
Lattice Structure ◽  
Sol Gel ◽  
Xenon Lamp ◽  
X Ray ◽  
One Step ◽  
Doped Titania

P-doped titania was synthesized by a one step hydrothermal method and sol-gel method, which is characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The samples prepared by hydrothermal method demonstrate higher photocatalytic activity toward the degradation of methylene blue under xenon lamp which has similar spectra to solar light, and also is much superior to that of the commercial P25. The as prepared P-doped titania shows a small particle size (the minimum reaches to 4.5 nm). In addition, the samples prepared by hydrothermal treatment could severely influence the crystal lattice structure. Morever, P-doped titania can further enhacnce the photocatalytic activity effectively, and hydrothermal treatment is a very suitable method for the synthesis of P-doped titania. This excellent performance could endow the as-prepared P-doped titania potential in purifying wastewater.

Efficient one-pot transformation of aminoarenes to haloarenes using halodimethylisulfonium halides generated in situ

2005 ◽  
Vol 83 (3) ◽  
pp. 213-219 ◽  
Author(s):  
Woonphil Baik ◽  
Wanqiang Luan ◽  
Hyun Joo Lee ◽  
Cheol Hun Yoon ◽  
Sangho Koo ◽  
...  
Keyword(s):  
Aromatic Amines ◽  
Environmental Pollutants ◽  
Aryl Halides ◽  
Nitrite Ion ◽  
One Pot ◽  
Aryl Chlorides ◽  
Step Procedure ◽  
One Step ◽  
Copper Halides

Halodimethylsulfonium halide 1, which is readily formed in situ from hydrohaloic acid and DMSO, is a good nucleophilic halide. This activated nucleophilic halide rapidly converts aryldiazonium salt prepared in situ by the same hydrohaloic acid and nitrite ion to aryl chlorides, bromides, or iodides in good yield. The combined action of nitrite ion and hydrohaloic acid in DMSO is required for the direct transformation of aromatic amines, which results in the production of aryl halides within 1 h. Substituted compounds with electron-donating or -withdrawing groups or sterically hindered aromatic amines are also smoothly transformed to the corresponding aromatic halides. The only observed by-product is the deaminated arene (usually <7%). The isolated aryldiazonium salts can also be converted to the corresponding aryl halides using 1. The present method offers a facile, one-step procedure for transforming aminoarenes to haloarenes and lacks the environmental pollutants that usually accompany the Sandmeyer reaction using copper halides. Key words: aminoarenes, haloarenes, halodimethylsulfonium halide, halogenation, amination.

One-pot solvothermal synthesis of biocompatible magnetic nanoparticles mediated by cucurbit[n]urils

2015 ◽  
Vol 3 (15) ◽  
pp. 3517-3521 ◽  
Author(s):  
Xi-Long Qiu ◽  
Yue Zhou ◽  
Xiao-Yu Jin ◽  
Ai-Di Qi ◽  
Ying-Wei Yang
Keyword(s):  
Magnetic Nanoparticles ◽  
Fe3o4 Nanoparticles ◽  
Solvothermal Synthesis ◽  
One Pot ◽  
Water Dispersible ◽  
Step Procedure ◽  
One Step ◽  
Magnetic Fe3o4 Nanoparticles ◽  
Magnetic Fe3o4

A facile one-step procedure for solvothermal synthesis of highly water-dispersible biocompatible magnetic Fe3O4 nanoparticles mediated by cucurbit[n]urils (CB[n]s) was presented.

One-step hydrothermal synthesis of a novel 3D BiFeWOx/Bi2WO6 composite with superior visible-light photocatalytic activity

2018 ◽  
Vol 20 (13) ◽  
pp. 3014-3023 ◽  
Author(s):  
Yanan Wang ◽  
Yiqing Zeng ◽  
Xuanyu Chen ◽  
Qiuyang Wang ◽  
Lina Guo ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Hydrothermal Synthesis ◽  
Visible Light ◽  
Hydrothermal Process ◽  
One Pot ◽  
Visible Light Photocatalytic Activity ◽  
One Step ◽  
Visible Light Photocatalytic

A novel 3D BiFeWOx/Bi2WO6 (BFW/BWO) composite has been synthesized via a facile one-pot hydrothermal process.

A One-Pot Hydrothermal Synthesis of Eu/BiVO4 Enhanced Visible-Light-Driven Photocatalyst for Degradation of Tetracycline

2020 ◽  
Vol 20 (5) ◽  
pp. 3053-3059 ◽  
Author(s):  
Zhenzhao Pei ◽  
Heng Jia ◽  
Yulong Zhang ◽  
Pei Wang ◽  
Yabao Liu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Active Species ◽  
Photocatalytic Process ◽  
One Pot ◽  
Photodegradation Efficiency ◽  
Activity Test ◽  
Visible Light Driven ◽  
One Step ◽  
Ft Ir

Eu/BiVO4 photocatalyst was synthesized by a facile one-step hydrothermal method. The structures and morphologies of Eu/BiVO4 photocatalysts were investigated by XRD, SEM and FT-IR and their photocatalytic activity was evaluated by the degradation of tetracycline hydrochloride (TCH) under the visible light irradiation. From the photocatalytic activity test, 1% Eu/BiVO4 displayed more superior photodegradation efficiency with 91.4% degradation efficiency of TCH in 150 min by contrast with 77.3% degradation rate of pure BiVO4. The mechanism has been explored that h+ is the primary active species, and ·OH is a secondary active substance in the photocatalytic process.

One-pot synthesis of 3D Cu2S–MoS2 nanocomposites by an ionic liquid-assisted strategy with high photocatalytic activity

2019 ◽  
Vol 43 (1) ◽  
pp. 269-276 ◽  
Author(s):  
Ya Chen ◽  
Penghe Su ◽  
Xiaotong Liu ◽  
Hongchi Liu ◽  
Baolin Zhu ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Photocatalytic Activity ◽  
Catalytic Activity ◽  
Hydrothermal Method ◽  
High Photocatalytic Activity ◽  
One Pot ◽  
One Pot Synthesis ◽  
One Step

Cu2S–MoS2 nanocomposites are synthesised by a one-step hydrothermal method and show better catalytic activity than Cu2S and MoS2 monomers.

scholarly journals A Photo-Enzymatic Cascade to Transform Racemic Alcohols into Enantiomerically Pure Amines

Catalysts ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 305 ◽  
Author(s):  
Jenő Gacs ◽  
Wuyuan Zhang ◽  
Tanja Knaus ◽  
Francesco G. Mutti ◽  
Isabel W.C.E. Arends ◽  
...  
Keyword(s):  
Aromatic Compounds ◽  
Reductive Amination ◽  
Aerobic Oxidation ◽  
Secondary Alcohols ◽  
One Pot ◽  
Enantiomerically Pure ◽  
Step Procedure ◽  
Wide Range ◽  
Aldehydes And Ketones ◽  
One Step

The consecutive photooxidation and reductive amination of various alcohols in a cascade reaction were realized by the combination of a photocatalyst and several enzymes. Whereas the photocatalyst (sodium anthraquinone-2-sulfonate) mediated the light-driven, aerobic oxidation of primary and secondary alcohols, the enzymes (various ω-transaminases) catalyzed the enantio-specific reductive amination of the intermediate aldehydes and ketones. The system worked in a one-pot one-step fashion, whereas the productivity was significantly improved by switching to a one-pot two-step procedure. A wide range of aliphatic and aromatic compounds was transformed into the enantiomerically pure corresponding amines via the photo-enzymatic cascade.

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