Description:

Background

The increasing global need for potable water is critical. While water is available in ample quantities on earth, the vast majority (>98%) is in undrinkable form (e.g., seawater, brackish water, or sewage water). There is a need for new materials and processes that can efficiently purify water by removing debris, biological matter, organic and inorganic impurities, and various salts. The most challenging of these impurities are salt and small neutral organic molecules, because their hydrodynamic size is most comparable to water molecules, complicating size-based separations. Porous materials, crystalline materials are highly resistant to high temperatures and pressure but, these properties are absent in state-of-the-art polymeric membranes, which results in membrane damage or degradation over time and chemical compromise (for example, reported damage after exposure to chlorine). 

To address these issues, the innovation puts forward 2D bio-inspired membranes that selectively exclude ions and neutral species but allow rapid water transport so that water purification is energy efficient. 

Technology Overview

NU researchers have developed a bio-inspired membrane that integrates the properties of crystalline 2D sheets to the programmable use of biomolecules as selectivity-tuning agents. The bio-inspired membrane was prepared by designing cationic and anionic peptides that can self-assemble to create positively and negatively charged surfaces that are bonded together via strong electrostatic interaction to form a layer-by-layer assembly. This design overcomes the inevitable hydration force. The absorbed molecules will be transported across the membrane, resulting in an increase in water driving force. Hence, this design of the crystalline membrane provides an effective filter for the removal of difficult impurities such as salt and small organic molecules. 

Benefits

  • Improved method of synthesis generating uniform pore size 
  • Tunable nanopore size of the membrane 
  • Favorable for catalytic reactions due to larger surface area availability 
  • Improved thermal, mechanical, and chemical stability of the membrane 
  • Rapid and effective water transport through the membrane 
  • Variety of applications due to the tunability of the pore size 

Applications

  • Water desalination 
  • Removal of organic contaminants from wastewater 
  • Removal of contaminants linking to waterborne diseases, including biomolecules, microorganism, and heavy metals 
  • Supercapacitor electrodes 
  • Energy storage and conversion device 

Opportunity

  •  License 
  • Partnering 
  • Research collaboration 
Patent Information:
For Information, Contact:
Mark Saulich
Associate Director of Commercialization
Northeastern University
m.saulich@northeastern.edu
Inventors:
Meni Wanunu
Bedanga Sapkota
Keywords: