Nethra Kuruthukulangara , D. Thirumalai , I.V. Asharani
{"title":"Eco-friendly synthesis and photocatalytic application of rGO-MgO nanocomposites for eosin Y dye degradation","authors":"Nethra Kuruthukulangara , D. Thirumalai , I.V. Asharani","doi":"10.1016/j.chphi.2025.100939","DOIUrl":null,"url":null,"abstract":"<div><div>Reduced graphene oxide-magnesium oxide nanocomposites (rGO-MgO NCs) were synthesized via a green and sustainable route using <em>Saraca asoca</em> leaf (<em>Sa</em>-leaf) extract as a natural reducing and capping agent. Graphene oxide, prepared using the modified Hummers method, was reduced and combined with MgO nanoparticles (MgO NPs) through a simple grinding technique. Structural and morphological characterizations confirmed the formation of a crystalline face-centered cubic MgO phase with nanorod and spherical morphologies uniformly distributed on rGO sheets. The nanocomposites exhibited an average particle size of 21.5 nm and a reduced band gap of 2.84 eV, enhancing charge separation and visible-light absorption. Under 500 W visible-light irradiation, the rGO-MgO NCs achieved 92.4% degradation of Eosin Y (EY) dye, following first-order kinetics, and demonstrated excellent stability and reusability across multiple cycles. Furthermore, ECOSAR-based toxicity predictions indicated that the degradation byproducts were environmentally benign. These findings highlight the potential of <em>Sa</em>-leaf-mediated rGO-MgO NCs as efficient, sustainable, and eco-friendly photocatalysts for wastewater remediation.</div></div>","PeriodicalId":9758,"journal":{"name":"Chemical Physics Impact","volume":"11 ","pages":"Article 100939"},"PeriodicalIF":4.3000,"publicationDate":"2025-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Chemical Physics Impact","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2667022425001252","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Reduced graphene oxide-magnesium oxide nanocomposites (rGO-MgO NCs) were synthesized via a green and sustainable route using Saraca asoca leaf (Sa-leaf) extract as a natural reducing and capping agent. Graphene oxide, prepared using the modified Hummers method, was reduced and combined with MgO nanoparticles (MgO NPs) through a simple grinding technique. Structural and morphological characterizations confirmed the formation of a crystalline face-centered cubic MgO phase with nanorod and spherical morphologies uniformly distributed on rGO sheets. The nanocomposites exhibited an average particle size of 21.5 nm and a reduced band gap of 2.84 eV, enhancing charge separation and visible-light absorption. Under 500 W visible-light irradiation, the rGO-MgO NCs achieved 92.4% degradation of Eosin Y (EY) dye, following first-order kinetics, and demonstrated excellent stability and reusability across multiple cycles. Furthermore, ECOSAR-based toxicity predictions indicated that the degradation byproducts were environmentally benign. These findings highlight the potential of Sa-leaf-mediated rGO-MgO NCs as efficient, sustainable, and eco-friendly photocatalysts for wastewater remediation.