A Novel Composite Nanofiltration Membrane Prepared by Interfacial Polymerization of 2,2′-Bis(1-Hydroxyl-1-trifluoromethyl-2,2,2-trifluoroethyl)-4,4′-methylenedianiline and Trimesoyl Chloride

Abstract

A novel composite nanofiltration (NF) membrane was prepared by interfacial polymerization of 2,2′-bis(1-hydroxyl-1-trifluoromethyl-2,2,2-trifluoroethyl)-4,4′-methylenedianiline (BHTTM) and trimesoyl chloride (TMC) on polyethersulfone (PES) supporting membrane. Different preparation conditions and NF membrane performances were discussed. The membrane structures of composite NF membranes were characterized by attenuated total reflectance infrared (ATR-IR), scanning electron microscope (SEM), and atomic force microscopy (AFM). The results showed that the NF membrane prepared under the optimum condition exhibited Na₂SO₄ rejection of 85.3% and the water flux of 10.1 l.m⁻².h⁻¹. The NF membrane was treated by 5000 ppm chlorine solution for 1 h. The salt rejection and water flux of the treated membrane reached to 94.5% and 94.8 l.m⁻².h⁻¹. The rejection of two NF membranes for inorganic electrolyte solutions decreased in the order of Na₂SO₄, MgSO₄, MgCl₂, and NaCl, which were typical characteristics of negatively charged membranes.

Keywords:

• 2,2′-bis(1-hydroxyl-1-trifluoromethyl-2,2,2-trifluoroethyl)-4,4′-methylenedianiline
• interfacial polymerization
• nanofiltration membrane
• oxidation treatment

ACKNOWLEDGEMENTS

The authors would like to thank for financial support by the Key Technology R&D Program of China (20092X 02032) and the Key Technology R&D Program of Shanghai Committee of Science and Technology in China (11DZ1205201). Also we are grateful to Dr. Ling-Feng Han to help for the measurement of the membrane morphologies.