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The US Army Engineer Research and Development Center has published the report/note described and linked below. Approved for public release; distribution is unlimited.
Crosslinking Graphene Oxide and Chitosan to Form Scalable Water Treatment Membranes
Jose Mattei-Sosa, Victor F. Medina, Chris S. Griggs, and Veera Gnaneswar Gude
Graphene oxide (GO) has emerged within the last decade as a next generation material for water treatment. Fabrication of GO membranes has been limited in scale and application due to repulsive hydration forces causing GO layers to electrostatically separate. In this study, chitosan is utilized to increase GO stability in the wet state through interactions with the negatively charged chitosan/graphene oxide (CSGO) sheets. This simple aqueous self-assembly allows scalable fabrication and enhanced stability for membrane applications in cross-flow. The CSGO membrane's performance was tested in a cross-flow reactor (CFR) and challenged with methylene blue at concentrations ranging from 1 to 100 parts per million (ppm) at 345 kilopascal (kPa), with fluxes ranging from 1 to 4.5 L/(m2 hr) and 100% removal via physical rejection. This work demonstrates that the CSGO composite matrix is a potential alternative to traditional polymeric membranes for water treatment using a renewable biopolymer and minimal chemical input.
61 pgs / 4.8 mb
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Release no. 19-013