Carbon research..最新文献

{"title":"Microwave-assisted synthesis of biomass-derived N-doped carbon dots for metal ion sensing.","authors":"Mehedi Hasan, Balachandran Baheerathan, Shrikanta Sutradhar, Ronak Shahbandinejad, Sudip Rakshit, Janusz Kozinski, Dongbing Li, Yulin Hu, Kang Kang","doi":"10.1007/s44246-025-00215-7","DOIUrl":"10.1007/s44246-025-00215-7","url":null,"abstract":"<p><p>Biomass-derived carbon dots (CDs) have gained significant research interest for environmental monitoring applications thanks to their cost-effectiveness and sustainability. Using eco-friendly biowastes as precursors for CDs production offers an alternative to expensive and unsustainable inorganic and chemically synthesized CDs. This study presents the findings regarding the successful synthesis of biomass-based nitrogen-doped carbon dots (N-CDs) via a rapid, cost-effective, and environmentally friendly microwave-assisted method. Carboxymethyl cellulose (CMC) and glycine were used as carbon precursors and nitrogen dopants for the first time. The N-CDs exhibited a moderately high quantum yield of 31.6 ± 1.5% with an optimal fluorescence excitation wavelength of 400 nm. FTIR, CHNS, and SEM-EDX analyses characterized the N-CDs' surface functional groups and elemental composition. The optical stability of the N-CDs was validated across varying pH levels and NaCl concentrations. The N-CDs displayed notable selectivity and sensitivity for Fe³⁺, Cu²⁺, and Hg²⁺ ions. The primary quenching mechanisms involve electrostatic interactions, π-π interactions, inner filter effects, and energy transfer. <i>Stern-Volmer</i> analysis revealed strong linear quenching for Fe³⁺, Cu²⁺, and Hg²⁺ ions within the 0-10 µM range concentrations, with detection limits (LOD) of 6.0 µM, 1.41 µM and 1.36 µM for Fe³⁺, Cu²⁺, and Hg²⁺, respectively. The fluorescence quenching for Fe³⁺ ions enhanced sensitivity at higher concentrations, while selectivity decreased at lower concentrations. These findings highlight the potential of these N-CDs as a cost-effective and sustainable tool for environmental monitoring, offering a promising approach to addressing critical water contamination issues.</p><p><strong>Graphical abstract: </strong></p>","PeriodicalId":520918,"journal":{"name":"Carbon research..","volume":"4 1","pages":"49"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12212424/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144556498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}