{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T09:07:48Z","timestamp":1790154468603,"version":"4.0.1"},"reference-count":43,"publisher":"MDPI AG","issue":"19","license":[{"start":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T00:00:00Z","timestamp":1790121600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Polymers"],"abstract":"<jats:p>This study presents the development of sustainable and multifunctional geopolymer composites produced from recycled volcanic ash collected from Mount Etna (Italy), used as an aluminosilicate precursor for the fabrication of environmentally friendly materials. Geopolymerization was activated using a 6 M sodium hydroxide (NaOH) solution. The geopolymer matrix was optimized by investigating three liquid-to-solid (L\/S) ratios (0.2, 0.3, and 0.4) in order to identify the most suitable formulation in terms of microstructure and porosity. SEM, EDS, BET, particle size distribution (PSD), and X-ray diffraction (XRD) analyses identified an L\/S ratio of 0.3 as the optimal formulation. Based on this optimized matrix, graphene nanoparticles were incorporated at concentrations of 0.1, 0.2, and 0.5 wt.% to evaluate their influence on the microstructural, thermal, mechanical, and durability-related properties of the composites. The resulting materials were characterized by SEM, EDS, XRD, differential scanning calorimetry (DSC), mechanical testing, and water absorption measurements. Finally, hybrid prototypes consisting of geopolymer bars coated with a transparent epoxy resin containing photoluminescent powder were fabricated. Their photoluminescent performance was qualitatively evaluated following direct solar irradiation by monitoring the persistence of light emission over time. The results demonstrate the feasibility of integrating a geopolymer matrix derived from volcanic waste, graphene nanoparticles, and a photoluminescent coating into a single sustainable and multifunctional material. Although this work represents a preliminary proof-of-concept study, it provides a promising foundation for the development of smart geopolymer-based materials for applications in civil infrastructure, passive safety systems, and guidance devices operating under low-light conditions.<\/jats:p>","DOI":"10.3390\/polym18192322","type":"journal-article","created":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T08:14:39Z","timestamp":1790151279000},"page":"2322","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Sustainable Graphene-Reinforced Geopolymer Composites Derived from Recycled Volcanic Ash: Matrix Optimization, Characterization, and Photoluminescent Proof-of-Concept"],"prefix":"10.3390","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0009-0001-8506-215X","authenticated-orcid":false,"given":"Luigi","family":"Madeo","sequence":"first","affiliation":[{"name":"Department of Environmental Engineering 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Res."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"8750","DOI":"10.1021\/la0604026","article-title":"Evolution of Gel Structure during Thermal Processing of Na-Geopolymer Gels","volume":"22","author":"Duxson","year":"2006","journal-title":"Langmuir"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"106767","DOI":"10.1016\/j.clay.2022.106767","article-title":"Metakaolin-Based Geopolymer Composites Modified by Epoxy Resin and Silane: Mechanical Properties and Organic\u2013Inorganic Interaction Mechanism","volume":"232","author":"Zhang","year":"2023","journal-title":"Appl. Clay Sci."},{"key":"ref_12","doi-asserted-by":"crossref","unstructured":"Caputo, P., Calandra, P., Loise, V., Le Pera, A., Putz, A.-M., Abe, A.A., Madeo, L., Teltayev, B., Luprano, M.L., and Alf\u00e8, M. (2022). When Physical Chemistry Meets Circular Economy to Solve Environmental Issues: How the ReScA Project Aims at Using Waste Pyrolysis Products to Improve and Rejuvenate Bitumens. Sustainability, 14.","DOI":"10.3390\/su14105790"},{"key":"ref_13","doi-asserted-by":"crossref","unstructured":"Madeo, L., Macario, A., Napoli, F., and De Luca, P. (2026). Licorice (Glycyrrhiza glabra): Botanical Aspects, Multisectoral Applications, and Valorization of Industrial Waste for the Recovery of Natural Fiber in a Circular Economy Perspective. Fibers, 14.","DOI":"10.3390\/fib14010014"},{"key":"ref_14","doi-asserted-by":"crossref","unstructured":"Rathod, N., Chippagiri, R., and Ralegaonkar, R.V. (2023). Cleaner Production of Geopolymer Materials: A Critical Review of Waste-Derived Activators. Mater. Today Proc., in press.","DOI":"10.1016\/j.matpr.2023.03.502"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"4433","DOI":"10.1007\/s11356-016-8230-8","article-title":"Volcanic ash-based geopolymer cements\/concretes: The current state of the art and perspectives","volume":"24","author":"Djobo","year":"2017","journal-title":"Environ. Sci. Pollut. Res."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"012001","DOI":"10.1088\/1757-899X\/572\/1\/012001","article-title":"Impact of Incorporation of Volcanic Ash on Geopolymerization of Eco-Friendly Geopolymer Composites: A Review","volume":"572","author":"Luhar","year":"2019","journal-title":"IOP Conf. Ser. Mater. Sci. Eng."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"133702","DOI":"10.1016\/j.conbuildmat.2023.133702","article-title":"High Temperature Behavior of Sodium and Potassium Volcanic Ashes-Based Alkali-Activated Materials (Mt. Etna, Italy)","volume":"408","author":"Scanferla","year":"2023","journal-title":"Constr. Build. Mater."},{"key":"ref_18","unstructured":"Gatta, G.D., and Comboni, D. (2026, July 21). Volcanic Raw Materials for the Low Environmental Impact Production of Pozzolanic Mortars. In Atti del Convegno\/Conference Proceedings; 2022. Available online: https:\/\/hdl.handle.net\/2434\/913601."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"717","DOI":"10.30909\/vol.07.02.717731","article-title":"Alkali Activated Materials from Tajogaite Volcanic Ash (La Palma, Spain): A Green Recovery after the 2021 Eruption","volume":"7","author":"Occhipinti","year":"2024","journal-title":"Volcanica"},{"key":"ref_20","doi-asserted-by":"crossref","unstructured":"Matsimbe, J., Dinka, M., Olukanni, D., and Musonda, I. (2022). Geopolymer: A Systematic Review of Methodologies. Materials, 15.","DOI":"10.3390\/ma15196852"},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"49","DOI":"10.1007\/s10163-023-01852-z","article-title":"Sustainable next-generation single-component geopolymer binders: A review of mechano-chemical behaviour and life-cycle cost analysis","volume":"26","author":"Singh","year":"2024","journal-title":"J. Mater. Cycles Waste Manag."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"4963","DOI":"10.1007\/s42247-025-01057-0","article-title":"Performance evaluation of sustainable recycled aggregates geopolymer concrete using cement and graphite nano\/micro platelets under heat and ambient curing","volume":"8","author":"Irum","year":"2025","journal-title":"Emergent Mater."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"106732","DOI":"10.1016\/j.jobe.2023.106732","article-title":"Physico-Mechanical Properties and Micromorphological Characteristics of Graphene Oxide Reinforced Geopolymer Foam Concrete","volume":"71","author":"Wang","year":"2023","journal-title":"J. Build. Eng."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"2459","DOI":"10.1016\/j.cej.2017.11.171","article-title":"A Novel Electroconductive Graphene\/Fly Ash-Based Geopolymer Composite and Its Photocatalytic Performance","volume":"334","author":"Zhang","year":"2018","journal-title":"Chem. Eng. J."},{"key":"ref_25","doi-asserted-by":"crossref","unstructured":"Madeo, L., Macario, A., Sapia, P., and De Luca, P. (2025). Synergistic Integration of Graphene Nanoparticles in Colloidal TiO2 for Gr\u00e4tzel Cells (DSSC). J. Compos. Sci., 9.","DOI":"10.3390\/jcs9110612"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"8752","DOI":"10.1021\/acsanm.3c01128","article-title":"Phase Change Materials Encapsulated in Coral-Inspired Organic\u2013Inorganic Aerogels for Flame-Retardant and Thermal Energy Storage","volume":"6","author":"Yin","year":"2023","journal-title":"ACS Appl. Nano Mater."},{"key":"ref_27","first-page":"1131","article-title":"Eco-Sustainable Photoluminescent Epoxy Composites Incorporating Etna Volcanic Ash as a Natural Waste for Decorative Building Applications","volume":"12","author":"Madeo","year":"2025","journal-title":"Procedia Environ. Sci. Eng. Manag."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"106459","DOI":"10.1016\/j.clay.2022.106459","article-title":"High Strength Metakaolin\/Epoxy Hybrid Geopolymers: Synthesis, Characterization and Mechanical Properties","volume":"221","author":"Singla","year":"2022","journal-title":"Appl. Clay Sci."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"107519","DOI":"10.1016\/j.porgcoat.2023.107519","article-title":"Highly-Transparent Fluorinated Epoxy Coating Prepared via Ring-Opening of Thiolactone and Thiol-Click Reactions for Robust Omniphobicity","volume":"179","author":"Fu","year":"2023","journal-title":"Prog. Org. Coat."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"110096","DOI":"10.1016\/j.porgcoat.2026.110096","article-title":"Dual-Functional Waterborne Coatings Featuring Enhanced Anticorrosion and Persistent Luminescence Enabled by Rare-Earth Doping","volume":"215","author":"Zheng","year":"2026","journal-title":"Prog. Org. Coat."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"119686","DOI":"10.1016\/j.jlumin.2023.119686","article-title":"Luminescent Properties of Lanthanide Complexes and Applications in Security Anti-Counterfeiting and Information Encryption Based on pH Response","volume":"257","author":"Wu","year":"2023","journal-title":"J. Lumin."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"5519","DOI":"10.1021\/acs.chemrev.1c00644","article-title":"Rare-Earth Doping in Nanostructured Inorganic Materials","volume":"122","author":"Zheng","year":"2022","journal-title":"Chem. Rev."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"e202401328","DOI":"10.1002\/asia.202401328","article-title":"Smart Luminescent Materials for Emerging Sensors: Fundamentals and Advances","volume":"20","author":"Manna","year":"2025","journal-title":"Chem.\u2013Asian J."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"1504","DOI":"10.1002\/bio.4324","article-title":"Colour-Switchable and Photoluminescent Polyvinyl Chloride for Multifunctional Smart Applications","volume":"37","author":"Elsawy","year":"2022","journal-title":"Luminescence"},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"111873","DOI":"10.1016\/j.eurpolymj.2023.111873","article-title":"All-in-One Photoluminescent Janus Nanoparticles for Smart Technologies: Organic Light-Emitting Diodes, Anticounterfeiting, and Optical Sensors","volume":"186","author":"Abdollahi","year":"2023","journal-title":"Eur. Polym. J."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"52958","DOI":"10.1021\/acsami.4c12254","article-title":"Smart Window with Reversible and Instantaneous Photoluminescence Based on Microsphere Structure","volume":"16","author":"Chen","year":"2024","journal-title":"ACS Appl. Mater. Interfaces"},{"key":"ref_37","doi-asserted-by":"crossref","unstructured":"Ricciotti, L., Frettoloso, C., Franchino, R., Pisacane, N., and Aversa, R. (2025). Geopolymer Materials: Cutting-Edge Solutions for Sustainable Design Building. Sustainability, 17.","DOI":"10.3390\/su17167483"},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"185458","DOI":"10.1016\/j.jallcom.2025.185458","article-title":"Invisible Near-Infrared Luminescent Marker Incorporating Egyptian Blue in Halloysite-Based Geopolymer Mortars: Applications in Covert Tagging","volume":"1050","author":"Armetta","year":"2026","journal-title":"J. Alloys Compd."},{"key":"ref_39","doi-asserted-by":"crossref","unstructured":"Rathinavel, N., Murugesan, A., Jaisankar, K., and Abdul Hameed, M.J.S.A. (2025). Innovative Materials for Next-Generation Defence Applications: Implications for Civil Infrastructure in Cost, Performance, and Mass Production. Innovative Materials for Next-Generation Defense Applications: Cost, Performance, and Mass Production, IGI Global Scientific Publishing.","DOI":"10.4018\/979-8-3373-0933-0.ch006"},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"599","DOI":"10.1080\/13602365.2021.1942581","article-title":"Peter Wilson and Mark Dorrian in Conversation","volume":"26","author":"Dorrian","year":"2021","journal-title":"J. Archit."},{"key":"ref_41","doi-asserted-by":"crossref","first-page":"49","DOI":"10.1016\/S0167-2991(07)80008-5","article-title":"Is the BET Equation Applicable to Microporous Adsorbents?","volume":"Volume 160","author":"Llewellyn","year":"2007","journal-title":"Characterization of Porous Solids VII, Proceedings of the 7th International Symposium on the Characterization of Porous Solids (COPS-VII), Aix-en-Provence, France, 26\u201328 May 2005"},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"373","DOI":"10.1021\/ja01145a126","article-title":"The Determination of Pore Volume and Area Distributions in Porous Substances. I. Computations from Nitrogen Isotherms","volume":"73","author":"Barrett","year":"1951","journal-title":"J. Am. Chem. Soc."},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"1366","DOI":"10.1021\/ja01236a048","article-title":"Surfaces of Solids. XIII. A Vapor Adsorption Method for the Determination of the Area of a Solid without the Assumption of a Molecular Area, and the Areas Occupied by Nitrogen and Other Molecules on the Surface of a Solid","volume":"66","author":"Harkins","year":"1944","journal-title":"J. Am. Chem. 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