Work

Surface-modified porous polycarbonate membrane with tannic acid anchored by functionalized TiO2@GA for efficient oily water separation

Year: 2025

Type: article

Abstract: Oily wastewater poses substantial environmental challenges. To address the accumulation of organics and contaminants on the membrane surface and the reduced lifespan of membranes, in this study, a novel surface modification strategy was developed involving the deposition of tannic acid (TA) as an intermediate layer on polycarbonate (PC) membranes, followed by the incorporation of gallic acid (GA)-functionalized TiO 2 nanoparticles (NPs). This hybrid coating enhanced the surface hydrophilicity and antifouling properties by preventing NPs agglomeration and ensuring uniform distribution. Characterization confirmed improved surface properties, including higher wettability, with a lower water contact angle of 16.5°and an underwater oil contact angle (158.9°). The optimized membrane demonstrated exceptional performance, achieving an oil/water separation flux of 310.11 L/m².h, 99.72% oil rejection, and an excellent fouling recovery ratio (FRR) of 93.77% at a near-zero operating pressure. These findings suggest that an eco-friendly, low-cost, high-performance modified membrane is desirable for oil-water separation in industrial applications with limited facilities.

Source: Environmental Technology & Innovation

DOI: 10.1016/j.eti.2025.104351

Authors: Amirjamshid Rahimnejad, Farzin Zokaee Ashtiani, Elshan Bonyadi

Institution: Amirkabir University of Technology

Language: English

Topic: Membrane Separation Technologies

Subfield: Water Science and Technology

Field: Environmental Science

Domain: Physical Sciences

SDGs: Clean water and sanitation, Responsible consumption and production

Open Access status: gold

Estimated APC paid: $2,930