Nanofiltration PVP Membrane with Gradient Cross-Linking for Efficient Polycyclic Aromatic Hydrocarbons Removal

Area of Science:

• Environmental Science
• Materials Science
• Chemical Engineering

Background:

• Polycyclic aromatic hydrocarbons (PAHs) are persistent organic pollutants contaminating water sources, posing risks to health and ecosystems.
• Nanofiltration membranes are effective for PAH removal but suffer from fouling and incomplete rejection.
• Developing advanced membranes is crucial for efficient water treatment and environmental protection.

Purpose of the Study:

• To develop a novel gradient cross-linking poly(vinylpyrrolidone) (PVP) nanofiltration membrane.
• To enhance polycyclic aromatic hydrocarbon (PAH) rejection performance.
• To improve the antifouling characteristics of nanofiltration membranes.

Main Methods:

• Fabrication of a new gradient cross-linking PVP nanofiltration membrane.
• Investigation of membrane performance using varying concentrations of sodium dodecyl sulfate (SDS).
• Evaluation of membrane flux, salt rejection, and PAH removal efficiencies.

Main Results:

• The gradient cross-linking technique improved both PAH rejection and antifouling properties.
• Optimal membrane flow was observed at a 0.15% SDS-PVP concentration.
• A trade-off between membrane flux and salt rejection was noted, with increased pore size affecting salt rejection.
• Reduced membrane flux occurred at 0.25% SDS-PVP due to poor SDS dispersion.
• Enhanced removal efficiencies were demonstrated for PAH compounds.

Conclusions:

• The developed gradient cross-linking PVP membrane shows significant potential for efficient PAH removal.
• This membrane technology can contribute to improved water quality and environmental preservation.
• The findings suggest broader applicability in various water treatment processes.