Progress in Chemistry
Volume 28, Issue 4, 24 April 2016, Pages 541-551, ISSN: 1005281X
Zhao, F., Mi, Y., An, Q., Gao, C.
Abstract
The nanofiltration is a type of pressure-driven membrane separation technology with properties between ultrafiltration and reverse osmosis. It offers several advantages such as low operation pressure, no phase transition, high separation efficiency, relatively low operation and maintenance costs. The application range of nanofiltration membrane in drinking water production, wastewater treatment, chemical processing, pharmaceutical and food industry and other potential beneficiaries has extended tremendously. Therefore, nanofiltration membranes with good separation performances are required for more complicated applications. To address these requirements, positively charged nanofiltration membranes have received more and more attentions. Polyethyleneimine (PEI) which is an important amine groups function cationic polyelectrolyte, has become one of the most important positively nanofiltration membrane materials because of its superior hydrophilicity, high charge density and reactivity. Preparation of positively PEI NF membranes (P-PEI-NFM) with high separation efficiency, good stability, pH stability, solvent resistance, antibacterial and antifouling properties has become a hot spot in recent years. Recent preparation methods of P-PEI-NFM are reviewed in this paper, and the applications such as in water softening, heavy metal removal, separation and concentration of basic dyes, separation of antibiotics and solvent resistant nanofiltration are summarized. The major problems existed at present are pointed out. In addition, this paper also provides useful information about the development of P-PEI-NFM. © 2016, Editorial Office of Progress in Chemistry. All right reserved.
DOI: 10.7536/PC151020