Free-Standing Graphene Oxide-Palygorskite Nanohybrid Membrane for Oil/Water Separation
Citations Over TimeTop 1% of 2016 papers
Abstract
Graphene oxide (GO) is an emerging kind of building block for advanced membranes with tunable passageway for water molecules. To synergistically manipulate the channel and surface structures/properties of GO-based membranes, the different building blocks are combined and the specific interfacial interactions are designed in this study. With vacuum-assisted filtration self-assembly, palygorskite nanorods are intercalated into adjacent GO nanosheets, and GO nanosheets are assembled into laminate structures through π-π stacking and cation cross-linking. The palygorskite nanorods in the free-standing GOP nanohybrid membranes take a 3-fold role, rendering enlarged mass transfer channels, elevating hydration capacity, and creating hierarchical nanostructures of membrane surfaces. Accordingly, the permeate fluxes from 267 L/(m(2) h) for GO membrane to 1867 L/(m(2) h) for GOP membrane. The hydration capacity and hierarchical nanostructures synergistically endow GOP membranes with underwater superoleophobic and low oil-adhesive water/membrane interfaces. Moreover, by rationally imparting chemical and physical joint defense mechanisms, the GOP membranes exhibit outstanding separation performance and antifouling properties for various oil-in-water emulsion systems (with different concentration, pH, or oil species). The high water permeability, high separation efficiency, as well as superior anti-oil-fouling properties of GOP membranes enlighten the great prospects of graphene-based nanostructured materials in water purification and wastewater treatment.
Related Papers
- → Adsorption of dyes onto palygorskite and its composites: A review(2016)247 cited
- → Experimental studies with palygorskite dusts.(1987)48 cited
- Factors Affecting the Occurrence of Palygorskite in Central Iranian Soils Developed on Tertiary Sediments(2013)
- The Relationship between Structural Variation and Relevant Properties of Palygorskite in Activation Process(2005)
- Magnesium Uptake and Palygorskite Transformation Abilities of Wheat and Oat(2012)