Preparation of 1,2,4,5-tetrasubstituted imidazoles over magnetic core-shell titanium dioxide nanoparticles

2016 ◽  
Vol 30 (8) ◽  
pp. 691-694 ◽  
Author(s):  
Ardeshir Khazaei ◽  
Ahmad Reza Moosavi-Zare ◽  
Fatemeh Gholami ◽  
Vahid Khakyzadeh
Keyword(s):  
Titanium Dioxide ◽  
Titanium Dioxide Nanoparticles ◽  
Magnetic Core ◽  
Core Shell ◽  
Tetrasubstituted Imidazoles

Magnetic core–shell titanium dioxide nanoparticles as an efficient catalyst for domino Knoevenagel–Michael-cyclocondensation reaction of malononitrile, various aldehydes and dimedone

RSC Advances ◽  
2015 ◽  
Vol 5 (19) ◽  
pp. 14305-14310 ◽  
Author(s):  
Ardeshir Khazaei ◽  
Fatemeh Gholami ◽  
Vahid Khakyzadeh ◽  
Ahmad Reza Moosavi-Zare ◽  
Javad Afsar
Keyword(s):  
Titanium Dioxide ◽  
Titanium Dioxide Nanoparticles ◽  
Magnetic Core ◽  
Solvent Free ◽  
Core Shell ◽  
One Pot ◽  
Efficient Catalyst ◽  
Solvent Free Conditions ◽  
Three Component Reaction ◽  
Cyclocondensation Reaction

Fe3O4@SiO2@TiO2 efficiently catalysed the preparation of tetrahydrobenzo[b]pyrans by a one-pot three component reaction of aldehydes, dimedone and malononitrile at 100 °C under solvent-free conditions.

scholarly journals Synthesis of core-shell titanium dioxide nanoparticles with water-soluble shell of poly(methacrylic acid)

2021 ◽  
Vol 12 (3) ◽  
pp. 336-345
Author(s):  
E.L. Krasnopeeva ◽  
E.Yu. Melenevskaya ◽  
O.A. Shilova ◽  
A.M. Nikolaev ◽  
A.V. Yakimansky
Keyword(s):  
Titanium Dioxide ◽  
Methacrylic Acid ◽  
Titanium Dioxide Nanoparticles ◽  
Water Soluble ◽  
Core Shell

Synthesis of Functionalized Magnetite Titanium Dioxide Nanocomposite for Removal of Acid Fuchsine Dye

2018 ◽  
Vol 21 (8) ◽  
pp. 583-593 ◽  
Author(s):  
Sara Rahnama ◽  
Shahab Shariati ◽  
Faten Divsar
Keyword(s):  
Titanium Dioxide ◽  
Removal Efficiency ◽  
Magnetic Core ◽  
Fractional Factorial ◽  
Order Kinetic ◽  
Sorption Data ◽  
Salt Addition ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Ft Ir

Objective: In this research, a novel magnetite titanium dioxide nanocomposite functionalized by amine groups (Fe3O4@SiO2@TiO2-NH2) was synthesized and its ability for efficient removal of Acid Fuchsine as an anionic dye from aqueous solutions was investigated. Method: The core-shell structure of Fe3O4@SiO2@TiO2 was prepared using Fe3O4 as magnetic core, tetra ethyl orthosilicate as silica and tetra butyl titanate as titanium source for shell. The synthesized nanocomposites (particle size lower than 44 nm) were characterized by FT-IR, XRD, DRS, SEM and TGA instruments. The various experimental parameters affecting dye removal efficiency were investigated and optimized using Taguchi fractional factorial design. Results: The synthesized adsorbent showed the highest removal efficiency of Acid Fuchsine (99 %) at pH= 3.5, without salt addition and during stirring at contact times less than 10 minutes. The study of kinetic models at two concentration levels showed the fast dye sorption on the surface of proposed nanocomposites with pseudo second order kinetic model (R2=1). Also, the fitting of Acid Fuchsine sorption data to Freundlich, Langmuir and Temkin isotherms suggested that Freundlich model gave a better fitting than other models (R2=0.9936, n=2). Conclusion: Good chemical stability, excellent magnetic properties, very fast adsorption kinetics and high removal efficiency make the synthesized nanocomposite as a proper recoverable sorbent for removal of Acid Fuchsine dye from wastewaters.

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