Authors
Hossein Alizadeh, Fereshteh Raouf, Reza Ghasemzadeh, Leila Mivehi
Published in
Environmental science and pollution research international. Aug 08, 2026. Epub Aug 08, 2026.
Abstract
Industrial oily wastewater and oil spills pose serious environmental threats, demanding efficient and scalable separation materials. In this work, a hydrophobic/oleophilic ZIF-8/polyurethane sponge (ZIF-8/PUS) composite was fabricated via a simple dip-coating and drying process at room temperature. The composite was characterized by X-ray diffraction, FTIR, scanning electron microscopy (SEM), Brunauer-Emmett-Teller (BET) surface area analysis, and Barrett-Joyner-Halenda (BJH) pore size distribution, confirming successful ZIF-8 deposition and a well-developed porous architecture. The water contact angle increased from 96.8 to 148.4°, while the oil contact angle remained 0°. The sponge achieved an oil absorption capacity of 36.1 g g⁻1 for 15W-40 oil and a water flux of 107 L m⁻2 h⁻1. Temperature-dependent separation tests (25-85 °C) yielded COD removal efficiencies of 99.24-97.55% and oil and grease removal of 99.20-97.74%. Statistics on triple experiments validated these results' robustness: One-way ANOVA showed significant differences in COD and oil/grease removal among experimental groups (p < 0.0001), and Tukey's HSD test showed that optimally adjusted samples outperformed controls (p < 0.05). The sponge retained performance after ten absorption-squeezing cycles. Application to real drilling rig wastewater (RIG-69 Fath unit) achieved 94.97% COD removal (6689 to 67 mg L⁻1) and 99.07% oil and grease removal, demonstrating practical potential for industrial oily wastewater treatment.
PMID:
42570976
Bibliographic data and abstract were imported from PubMed on 09 Aug 2026.
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