Hamline News

Lifeng Dong Published

Lifeng Dong, physics professor and the Emma K. and Carl R. N. Malmstrom Endowed Chair in Physics, co-authored a scientific article titled "Layer-by-layer self-assembly TiO2 and graphene oxide on polyamide reverse osmosis membranes with improved membrane durability" published in Desalination.

Reverse osmosis has become a leading technology in waste water treatment, ultrapure water production, and water desalination. The most commonly used commercial membranes are made of aromatic polyamide (PA) material, which is exemplified by an interfacially polymerized reaction on polysulfone ultrafiltration membranes. However, they often encounter performance attenuation because of microbial biofouling and poor chlorine resistance. In this collaborative project with researchers at Qingdao University of Science and Technology in China, few-layered TiO2 nanoparticles and graphene oxide were self-assembled layer by layer onto flat PA membrane surfaces by hydrogen bonding and physical absorption.