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<p>The present study investigates the transformation of algae waste into polyethylene glycol (PEG)/cellulose nanocomposites through a series of chemical treatments, analyzing their structural, morphological, and physicochemical properties. FTIR analysis revealed progressive chemical modifications, including the emergence of carboxylate peaks (1400–1450&#xa0;cm<sup>−1</sup>) after alkali treatment and C=O stretching (1750–1800&#xa0;cm<sup>−1</sup>) following bleaching. XRD analysis showed that the crystallinity index increased from 47.0% (raw algae waste) to 49.5% (alkali-treated), but decreased to 35.5% upon PEG incorporation, indicating disruption of cellulose’s ordered structure. SEM images depicted morphological evolution from a heterogeneous matrix to a highly fibrillated structure post-acid hydrolysis, with PEG grafting leading to a more compact morphology. Zeta potential analysis revealed surface charge variations, with values decreasing from − 18.2&#xa0;mV (raw) to − 22.6&#xa0;mV (alkali-treated), while PEG grafting reduced it to − 10.4&#xa0;mV, suggesting steric stabilization. DLS results confirmed a reduction in hydrodynamic diameter from 450&#xa0;nm (raw) to 215&#xa0;nm (acid-hydrolyzed), highlighting size refinement.Anticorrosion properties were evaluated using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) in a corrosive medium, revealing a maximum corrosion inhibition efficiency of 72.7% (EIS) and 89.7% (weight loss) at an optimal composite concentration. These findings highlight the potential of algae-derived cellulose-based PEG composites as eco-friendly corrosion inhibitors for metal protection in marine and industrial environments.</p>

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Green Algae Derived Cellulose for PEG Composite: A Comprehensive Study on Synthesis, Characterization and Anticorrosion Applications

  • 期刊论文

  • 发表日期：

    2025年9月6日

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  • Pratham Taneja,
  • Navdeep Kaur,
  • Nibedita Banik

摘要

The present study investigates the transformation of algae waste into polyethylene glycol (PEG)/cellulose nanocomposites through a series of chemical treatments, analyzing their structural, morphological, and physicochemical properties. FTIR analysis revealed progressive chemical modifications, including the emergence of carboxylate peaks (1400–1450 cm−1) after alkali treatment and C=O stretching (1750–1800 cm−1) following bleaching. XRD analysis showed that the crystallinity index increased from 47.0% (raw algae waste) to 49.5% (alkali-treated), but decreased to 35.5% upon PEG incorporation, indicating disruption of cellulose’s ordered structure. SEM images depicted morphological evolution from a heterogeneous matrix to a highly fibrillated structure post-acid hydrolysis, with PEG grafting leading to a more compact morphology. Zeta potential analysis revealed surface charge variations, with values decreasing from − 18.2 mV (raw) to − 22.6 mV (alkali-treated), while PEG grafting reduced it to − 10.4 mV, suggesting steric stabilization. DLS results confirmed a reduction in hydrodynamic diameter from 450 nm (raw) to 215 nm (acid-hydrolyzed), highlighting size refinement.Anticorrosion properties were evaluated using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) in a corrosive medium, revealing a maximum corrosion inhibition efficiency of 72.7% (EIS) and 89.7% (weight loss) at an optimal composite concentration. These findings highlight the potential of algae-derived cellulose-based PEG composites as eco-friendly corrosion inhibitors for metal protection in marine and industrial environments.