Polymer Bulletin, Vol.77, No.7, 3485-3498, 2020
p-Phenylenediamine-grafted multi-walled carbon nanotubes as a hydrophilic modifier in thin-film nanocomposite membrane
In this paper, an efficient thin-film nanocomposite (TFN) membrane was synthesized by interfacial polymerization and used for water desalination. Piperazine (PIP) and trimesoyl chloride were used as monomers, andp-phenylenediamine-grafted multi-walled carbon nanotube (p-PDA-MWCNT) was used as a hydrophilic modifier to enhance the performance of the polysulfone nanofiltration membrane. In order to characterize the synthesizedp-PDA-MWCNTs, Fourier transform infrared spectroscopy, scanning electron microscopy, thermogravimetric analysis and electron-dispersive spectroscopy were used. In order to enhance the performance of the membrane, different concentrations ofp-PDA-MWCNTs (0.01, 0.02, 0.04, 0.05 and 0.075 wt%) were added to the PIP solution to preparep-PDA-MWCNTs-embedded membranes. To check the performance of the modified membrane, solutions of 1000 mg L-1Na2SO4, MgSO4, NaCl and CaCl(2)were tested. The results show that TFN-modified membrane provides excellent water permeability and also salt rejection in the presence of 0.02 wt%p-PDA-MWCNTs which shows superior improvement in TFN membrane.