Pressure Driven Desalination Utilizing Nanomaterials

<p>Nanomaterials such as graphene oxide and carbon nanotubes, have demonstrated excellent properties for membrane desalination, including decrease of maintenance, increase of flux rate, simple solution casting, and impressive chemical inertness. Here, two projects are studied to investigate nanocarbon based membrane desalination. The first project is to prepare hybrid membranes with amyloid fibrils intercalated with graphene oxide sheets. The addition of protein amyloid fibrils expands the interlayer spacing between graphene oxide nanosheets and introduces additional functional groups in the diffusion pathways, resulting in increase of flux rate and rejection rate for the organic dyes. Amyloid fibrils also provide structural assistance to the hybrid membrane, which supresses cracking and instability of graphene oxide sheets. The second project is to fabricate polymer nanocomposite membranes with carbon nanotubes encapsulated by polymerized surfactants. The designed polymerizable surfactant forms lyotropic liquid crystalline mesophases in an aqueous medium with hexagonal packing of cylindrical micelles. The adsorption of surfactants on the surface of carbon nanotubes allows a stable dispersion of carbon nanotubes encapsulated in the cylindrical micelles, resulting in the ordered structure. After photo-polymerization, the composite membranes display enhanced dye rejection. Both projects have shown promising ways to improve membrane filtration by using nanomaterials.</p>

Name thesis:degree_name

MS in Polymers and Coatings

Discipline thesis:degree_discipline

Chemistry & Biochemistry

Year dc:date.available

2020

Author dc:creator

• Xie, Fangyou

Contributors dc:contributor

• Shanju Zhang
• Chemistry & Biochemistry
• College of Science and Mathematics

• nanomaterials
• pressure driven desalination
• graphene oxide
• amyloid fibrils
• carbon nanotubes
• membrane desalination
• Biochemistry
• Biological and Chemical Physics
• Materials Chemistry
• Organic Chemistry
• Physical Sciences and Mathematics
• Polymer Chemistry

Identifier

10.15368/theses.2020.90

OAI identifier oai:identifier

oai:digitalcommons.calpoly.edu:theses-3717