Reactive Polymeric Membranes for Advanced Water Treatment: Bridging Mechanisms, Kinetics and Scalable Deployment.

Area of Science:

• Materials Science
• Environmental Engineering
• Chemical Engineering

Background:

• Conventional membranes primarily retain pollutants, necessitating secondary treatment.
• Reactive polymeric membranes integrate separation with in situ contaminant degradation.
• These membranes utilize built-in catalytic domains for pollutant transformation.

Purpose of the Study:

• To review the development of intrinsic reactive polymer membranes for oxidative filtration.
• To emphasize the structure-property-performance relationships in these membranes.
• To outline a roadmap for translating reactive membrane technology to full-scale applications.

Main Methods:

• Discussion of intrinsic reactive polymer membrane classes (stable-radical, redox-active, conductive, porous conjugated).
• Analysis of reactive transport kinetics (convection-diffusion-reaction coupling, residence time, Damköhler and Péclet numbers).
• Review of challenges including fouling, aging, leaching, and byproduct formation.

Main Results:

• Reactive membranes can enrich, activate, and degrade micropollutants during water permeation.
• Key factors influencing performance include polymer structure, transport phenomena, and reactive oxygen species generation.
• Adsorption-enhanced degradation is a significant degradation pathway.

Conclusions:

• Reactive polymeric membranes show great promise for efficient water and wastewater treatment.
• Addressing challenges like fouling, aging, and toxicity is crucial for technology translation.
• Further development requires standardized reporting, scale-up, and techno-economic assessments.