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As a result, wastewater treatment has become an indispensable requirement. In this study, we synthesized supermagnetic iron oxide (Fe<jats:sub>3<\/jats:sub>O<jats:sub>4<\/jats:sub> NPs) and gold-iron oxide bimetallic nanoparticles (Au@Fe<jats:sub>3<\/jats:sub>O<jats:sub>4<\/jats:sub> BNPs) using an eco-friendly method that involved natural compounds extracted from brown Egyptian propolis. We employed UV-visible spectroscopy, FTIR, XRD, VSM, SEM, HRTEM, EDX, Zeta potential and XPS techniques to examine the optical characteristics, chemical structure, crystalline structure, magnetic properties, morphology, size, and chemical composition of these biosynthesized nanoparticles. Furthermore, these nanoparticles were used as nanocatalysts for the removal of cationic dyes. The photocatalytic results indicated high efficiency in the removal of methylene blue (MB), crystal violet (CV), and malachite green (MG) dyes from aqueous solutions using Fe<jats:sub>3<\/jats:sub>O<jats:sub>4<\/jats:sub> NPs and Au@Fe<jats:sub>3<\/jats:sub>O<jats:sub>4<\/jats:sub> BNPs. The removal rates of MB, CV, and MG were about 95.2% in 70 min, 99.4% in 50 min, and 96.2% in 60 min for Fe<jats:sub>3<\/jats:sub>O<jats:sub>4<\/jats:sub> NPs, and 97.1% in 50 min, 99.1% in 30 min, and 98.1% in 50 min for Au@Fe<jats:sub>3<\/jats:sub>O<jats:sub>4<\/jats:sub> BNPs, respectively. The study also assessed the potential anti-radical properties of the extract, Fe<jats:sub>3<\/jats:sub>O<jats:sub>4<\/jats:sub> NPs, and Au@Fe<jats:sub>3<\/jats:sub>O<jats:sub>4<\/jats:sub> BNPs using the DPPH assay, and the results demonstrated their antioxidant activity. Finally, these Fe<jats:sub>3<\/jats:sub>O<jats:sub>4<\/jats:sub> NPs and Au@Fe<jats:sub>3<\/jats:sub>O<jats:sub>4<\/jats:sub> BNPs have the potential to serve as efficient antioxidants and photocatalysts for removing basic dyes from water.<\/jats:p>\n                <jats:p><jats:bold>Graphical abstract<\/jats:bold><\/jats:p>","DOI":"10.1007\/s11356-024-32775-3","type":"journal-article","created":{"date-parts":[[2024,3,9]],"date-time":"2024-03-09T03:01:25Z","timestamp":1709953285000},"page":"24894-24912","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["Highly efficient degradation of basic dyes using gold-coated nature-based supermagnetic iron oxide nanoparticles as eco-friendly nanocatalysts"],"prefix":"10.1007","volume":"31","author":[{"given":"Ghassan H.","family":"Matar","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Muberra","family":"Andac","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,3,9]]},"reference":[{"key":"32775_CR1","doi-asserted-by":"publisher","first-page":"133060","DOI":"10.1016\/j.matlet.2022.133060","volume":"327","author":"AS Abdelsattar","year":"2022","unstructured":"Abdelsattar AS, Eid A, Rezk N, Hussein AH, El-Shibiny A (2022) Biosynthesis of gold nanoparticles using ethanolic propolis extract for methylene blue and Rhodamine-B removal. 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