Application of highly sulfonated single-walled carbon nanotubes: An efficient heterogeneous catalyst for the one-pot synthesis of 14-aryl-14H-dibenzo[a,j]xanthenes under solvent-free conditions

Abstract

Highly sulfonated single-walled carbon nanotube-catalyzed synthesis of 14-aryl-14Hdibenzo [a,j]xanthenes in excellent yields and very short reaction times. Sulfonated singlewalled carbon nanotubes are prepared using a chemical and simple process and it characterized by Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, Thermal gravimetric analysis (TGA) and acid-base titration. The sulfonated single-walled carbon nanotube was easily separated by simple filtration and was recycled eight consecutive times without any loss in its activity.

A Room Temperature Gas Sensor Based on Sulfonated SWCNTs for the Detection of NO and NO2

“…The experimental procedure for the preparation of sulfonated SWCNTs is schematically highlighted in Figure 1 . To purify the CNTs and remove any remaining particles of catalyst used during the process of nanotubes growth, the SWCNTs (purchased from Sigma-Aldrich Chemie GmbH, Steinheim, Germany) were first mixed in a 1:1 solution of HNO 3 and HCl, sonicated for 1 h, and then heated up at 60 °C and again sonicated for another 3 hours, resulting thus SWCNT-COOH [ 19 , 21 ]. Next, commercially available sulphuric acid of 98% purity was used on the obtained SWCNT-COOH in order to convert them to SWCNT-SO 3 H. The mixture was sonicated for 30 min and after transferred into a temperature resistant glass container and heated from 60 °C to 300 °C in an electric heater under a protective atmosphere, with a temperature ramp increase of 5 °C/min.…”

Synthesis, characterization and catalytic activity of sulphonated multi-walled carbon nanotubes as heterogeneous, robust and reusable catalysts for the synthesis of bisphenolic antioxidants under solvent-free conditions

“…MWCNTs-SO 3 H has been produced by some reported methods. [22][23][24][25] In continuation of our interest towards development of acidic nanocatalysts, 26 in this study, we wish to report a facile and environmental-friendly method for the synthesis of bisphenolic antioxidants using MWCNTs-SO 3 H as reusable solid acid catalyst under solvent-free conditions (scheme 1).…”

A mild convenient ultrasound assisted synthesis of 2-aryl benzoxazoles catalyzed by KCN/MWCNT as an efficient heterogeneous nanocatalyst

“…: +98 361 5912397 E-mail address: naeimi@kashanu.ac.ir (H. Naeimi). integrity, resistance in acidic/basic conditions and controllable dimensional characteristics [19,20]. Also the proper pore sizes of them lead to diffusion, reaction and desorption of chemical species [21].…”