A Novel Graphene Oxide/γ-Alumina Hybrid Nano-Adsorbent Integrated into Polyurethane Foam for Adsorption of Industrial Pollutants from Wastewater
- 1Department of Chemical Engineering, Shah.C, Islamic Azad University, Shahreza 8648146411, Iran
Abstract
This study reports the synthesis, characterization, and wastewater treatment performance of a hybrid nanocomposite based on graphene oxide (GO) and γ-alumina (γ-Al2O3). Functionalization was carried out via silanization using GPTMS for GO and APTES for γ-Al2O3, followed by covalent grafting through epoxy–amine linkage. FTIR spectroscopy confirmed successful grafting, showing Si–O–Si stretching and reduced epoxy ring vibrations. BET analysis indicated that the GO/γ-Al2O3 hybrid (ALGO) preserved a high specific surface area (198.08 m2/g), comparable to commercial γ-Al2O3, demonstrating that GO did not hinder porosity. ALGO was incorporated into polyurethane foam at loadings of 1–5% (ALGO@PU foam) and applied in wastewater treatment. UV-Vis spectroscopy revealed strong affinity for silver ions, evidenced by a decrease in AgNO3 absorbance (~430–600 nm) with increasing AlGO content. Treatment of real industrial wastewater showed significant reductions in chemical oxygen demand (COD), biological oxygen demand (BOD), and turbidity. At 5% loading, COD and BOD decreased from 1162 and 480 mg/L to 64 and 11 mg/L, respectively, while turbidity dropped from >1100 NTU to 1.62 NTU. These results demonstrate that ALGO is a functional adsorbent capable of removing ion metals, and improving water clarity, highlighting its potential for industrial wastewater treatment applications.
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BibTeX
@article{sadri2026novel,
title = {{A Novel Graphene Oxide/γ-Alumina Hybrid Nano-Adsorbent Integrated into Polyurethane Foam for Adsorption of Industrial Pollutants from Wastewater}},
author = {Salar Sadri and Mohammad Hassan Vakili and Nader Mokhtarian},
journal = {Nanomaterials},
year = {2026},
month = sep,
doi = {10.3390/nano16191239},
url = {https://www.mdpi.com/2079-4991/16/19/1239},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - A Novel Graphene Oxide/γ-Alumina Hybrid Nano-Adsorbent Integrated into Polyurethane Foam for Adsorption of Industrial Pollutants from Wastewater
AU - Salar Sadri
AU - Mohammad Hassan Vakili
AU - Nader Mokhtarian
PY - 2026
DA - 2026/09/30
JO - Nanomaterials
DO - 10.3390/nano16191239
UR - https://www.mdpi.com/2079-4991/16/19/1239
AB - This study reports the synthesis, characterization, and wastewater treatment performance of a hybrid nanocomposite based on graphene oxide (GO) and γ-alumina (γ-Al2O3). Functionalization was carried out via silanization using GPTMS for GO and APTES for γ-Al2O3, followed by covalent grafting through epoxy–amine linkage. FTIR spectroscopy confirmed successful grafting, showing Si–O–Si stretching and reduced epoxy ring vibrations. BET analysis indicated that the GO/γ-Al2O3 hybrid (ALGO) preserved a high specific surface area (198.08 m2/g), comparable to commercial γ-Al2O3, demonstrating that GO did not hinder porosity. ALGO was incorporated into polyurethane foam at loadings of 1–5% (ALGO@PU foam) and applied in wastewater treatment. UV-Vis spectroscopy revealed strong affinity for silver ions, evidenced by a decrease in AgNO3 absorbance (~430–600 nm) with increasing AlGO content. Treatment of real industrial wastewater showed significant reductions in chemical oxygen demand (COD), biological oxygen demand (BOD), and turbidity. At 5% loading, COD and BOD decreased from 1162 and 480 mg/L to 64 and 11 mg/L, respectively, while turbidity dropped from >1100 NTU to 1.62 NTU. These results demonstrate that ALGO is a functional adsorbent capable of removing ion metals, and improving water clarity, highlighting its potential for industrial wastewater treatment applications.
SN - 2079-4991
ER -