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Research Article Open access CC BY 4.0

Eco-friendly Nanocomposites for the Degradation of Emerging Contaminants in Wastewater Systems

Eucharia Uju Chukwukwe, Charles Deigh, Caleb Joel Nwaogwugwu, Jesse Chigozirim Nwankwo, Uche Stanley Chukwuemeka

Asian Journal of Advanced Research and Reports · pp. 256–281 · Published 19 Aug 2025

10.9734/ajarr/2025/v19i81129

Abstract

Emerging contaminants (ECs) including pharmaceuticals, endocrine-disrupting compounds (EDCs), microplastics, and personal care products have become persistent pollutants in aquatic environments due to their resistance to conventional wastewater treatment methods. This study investigates the green synthesis, comprehensive characterization, and exceptional performance of biodegradable, plant-based nanocomposites for the removal and degradation of ECs from wastewater systems. Eco-friendly nanomaterials were synthesized using cellulose nanocrystals, chitosan, and starch matrices embedded with metal oxide nanoparticles (ZnO, TiO₂, CuO, Fe₃O₄), functionalized through phytochemical reduction using extracts from Camellia sinensis (green tea), Moringa oleifera, Aloe vera, and Azadirachtaindica (neem). The biosynthesized nanocomposites demonstrated optimal physicochemical properties with high surface areas (50–300 m²/g), nano-scale particle sizes (10–100 nm), and zeta potentials of ±30-50 mV ensuring colloidal stability. Remarkable removal efficiencies of 87.3–96.5% were achieved for diverse contaminants: Fe₃O₄/chitosan-green tea (94.2% tetracycline), ZnO/cellulose-moringa (89.7% BPA), TiO₂/alginate-aloe vera (91.5% microplastics), and CuO/starch-neem (87.3% ibuprofen), representing 3-15 fold improvements over conventional methods. Mechanistic studies revealed synergistic tri-modal action through physical adsorption via π-π interactions and hydrogen bonding, photocatalytic degradation generating reactive oxygen species (•OH, O₂•⁻), and enzymatic breakdown through laccase-mediated oxidation. Kinetic analysis confirmed pseudo-second-order behavior (R² > 0.99) with rate constants 2-5 times higher than conventional adsorbents, while thermodynamic parameters revealed spontaneous, exothermic processes (ΔG° = -22.8 to -30.2 kJ/mol). Exceptional reusability was demonstrated over 12-18 cycles with >85% efficiency retention. Comprehensive biodegradation studies under OECD 301F conditions showed >78% mass loss within 45 days, with microbial community analysis (16S rRNA sequencing) identifying specific degradative organisms (Bacillus subtilis, Trichoderma viride, Pseudomonas putida) and enzymatic activities (cellulase: 47.2 U/g, chitinase: 52.8 U/g, amylase: 38.9 U/g). Temperature-dependent kinetics revealed activation energies of 47.3-52.3 kJ/mol and Q₁₀ coefficients of 2.0-2.3, confirming biological degradation mechanisms. Extensive safety assessment showed metal leaching far below regulatory limits (Zn <0.05 μg/L, Cu 0.18 μg/L, Fe 0.45 μg/L), low bioaccumulation factors (BCF: 8-47, BAF: 0.18-0.89), and minimal ecotoxicity (LC₅₀>400-1000 mg/L for Daphnia magna and Lactuca sativa). Life cycle assessment using SimaPro 9.5 revealed dramatic environmental benefits: 68-85% reductions in greenhouse gas emissions, fossil fuel consumption, and human health risks compared to conventional nanomaterials, with negative carbon footprints (-12.8 to -18.5 kg CO₂-eq/kg) through composting scenarios. Material recovery rates of 78-90% contributed to exceptional circularity indices (0.89-0.95). This study establishes plant-derived nanocomposites as transformative, environmentally compatible solutions for mitigating emerging pollutants, offering unprecedented combination of high efficiency, biodegradability, safety, and sustainability for both centralized and decentralized water treatment applications.

Eco-friendly nanocomposites emerging contaminants green synthesis biodegradable nanomaterials phytochemical functionalization multi-modal degradation life cycle assessment circular economy environmental sustainability water treatment

References (21)

  1. 1 Adsorption kinetic modeling using pseudo-first order and pseudo-second order rate laws: A review [DOI]
  2. 2 Effectiveness of physical activity interventions for improving depression, anxiety and distress: an overview of systematic reviews [DOI]
  3. 3 Enzyme Immobilization Technologies and Industrial Applications [DOI]
  4. 4 Revisiting the Green Synthesis of Nanoparticles: Uncovering Influences of Plant Extracts as Reducing Agents for Enhanced Synthesis Efficiency and Its Biomedical Applications [DOI]
  5. 5 Bioplastic production in terms of life cycle assessment: A state-of-the-art review [DOI]
  6. 6 Green Nanotechnology: Plant-Mediated Nanoparticle Synthesis and Application [DOI]
  7. 7 The Antimicrobial Potential of the Neem Tree Azadirachta indica [DOI]
  8. 8 Emerging environmentally friendly bio-based nanocomposites for the efficient removal of dyes and micropollutants from wastewater by adsorption: a comprehensive review [DOI]
  9. 9 Mitochondrial DNA quantification as a tool for embryo viability assessment: retrospective analysis of data from single euploid blastocyst transfers [DOI]
  10. 10 Biopolymeric Nanocomposites for Wastewater Remediation: An Overview on Recent Progress and Challenges [DOI]
  11. 11 Emerging Contaminants and Their Removal from Aqueous Media Using Conventional/Non-Conventional Adsorbents: A Glance at the Relationship between Materials, Processes, and Technologies [DOI]
  12. 12 Moringa oleifera: Processing, phytochemical composition, and industrial applications [DOI]
  13. 13 Green synthesis and multifaceted applications: challenges and innovations in carbon dot nanocomposites [DOI]
  14. 14 Photocatalytic Degradation of Organic Pollutants and Microplastics Using Ag/TiO2: Recent Advances in Mechanism, Synthesis and Properties [DOI]
  15. 15 Nanocomposites Materials and Their Applications: Current and Future Trends [DOI]
  16. 16 Response of rice quality to climate warming: a meta-analysis [DOI]
  17. 17 Evaluation of Ecotoxicity in Waste Leachate: A Current Status of Bioassay and Chemical Analysis [DOI]
  18. 18 Ceramic honeycomb as support for covalent immobilization of laccase from Trametes versicolor and transformation of nuclear fast red [DOI]
  19. 19 Landfill Leachate Collection and Characterization [DOI]
  20. 20 Copper Nanodrugs by Atom Transfer Radical Polymerization [DOI]
  21. 21 Assessing the Composition and Diversity of Zooplankton in Bhosga Lake, Kalaburagi District, Karnataka, India: Implications for Water Quality and Conservation [DOI]

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