Basak, Somjyoti and Majumdar, Swachchha and Ghosh, Sourja (2025) Development of A Hydrophobic Multilayer Membrane for Efficient Removal of Polycyclic Aromatic Hydrocarbons (PAHs) in Coastal Groundwater. In: Ceramic and Glass Technology in the Modern Era: Challenges, Opportunities, and Sustainability (CGTME-2025), 8-9 August 2025, CSIR CGCRI.

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Abstract

The increasing contamination of coastal groundwater by polycyclic aromatic hydrocarbons (PAHs), especially in sensitive areas like the Sundarbans, calls for robust remediation strategies. This study introduces a trilayered superhydrophobic composite membrane built on a mullite–α-alumina tubular support, consisting of a γ-δ alumina base, kaolin clay interlayer, and a silane-modified top layer. Optimized through controlled precursor concentrations, the membrane displayed hierarchical porosity, superhydrophobicity (contact angle ~155°), and thermal and chemical stability. Characterization confirmed the presence of microporous and mesoporous layers, essential for size-exclusion-driven separation. The membrane's performance was tested on real Sundarbans groundwater samples containing various PAHs, cations, and anions. Gas chromatography identified 11 PAH components per sample, with total concentrations of 6.96 µg/mL and 11.24 µg/mL. The membrane achieved 97.55% PAH removal from Sample A and 58.76% from Sample B. Rejection modeling using Spiegler-Kedem–Film Theory and Extended Nernst–Planck models showed that ion concentration and type significantly influence separation efficiency because of polarization effects. While divalent and multivalent ions were effectively removed (>80%), monovalent ions like Na⁺ and Cl⁻ exhibited lower rejection rates. This study presents a scalable membrane-based approach for PAH cleanup, harnessing inorganic-organic synergy and hierarchical structure to overcome the limits of traditional technologies.

Item Type:	Conference or Workshop Item (Lecture)
Subjects:	Environment and Pollution Ceramic-Metal Systems
Divisions:	Ceramic Membrane
Depositing User:	Ms Upasana Sahu
Date Deposited:	01 Sep 2025 10:37
Last Modified:	01 Sep 2025 10:37
URI:	http://cgcri.csircentral.net/id/eprint/5782

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