The research result was published in ACS Applied Materials & Interfaces. Citing: Jiali Wang, XueliGao*, Jian Wang, Yi Wei, Zhaokui Li, Congjie Gao. O-(carboxymethyl)-chitosan Nanofiltration Membrane Surface Functionalized with Graphene Oxide Nanosheets for Enhanced Desalting Properties. ACS Appl. Mater. Interfaces, 2015, 7 (7), 4381–4389.