文献类型：期刊文献

英文题名：Preparation and application of carbon quantum dots derived from laver biomass via solvent-free pyrolysis

作者：Li, Wanjun[1];Wu, Yulian[1];Liu, Lulu[1];Luo, Xiaoyu[1];Wen, Yanmei[1]

机构：[1]Guangdong Ocean Univ, Fac Chem & Environm Sci, Zhanjiang 524088, Peoples R China

年份：2026

卷号：161

外文期刊名：DIAMOND AND RELATED MATERIALS

收录：SCI-EXPANDED(收录号：WOS:001628085600004)、、WOS

基金：Funding This work was supported by the Natural Science Foundation of Guangdong Province [No. 2021A1515010304] .

语种：英文

外文关键词：Laver; Carbon quantum dots; Iron ions; Fluorescence; Solvent-free pyrolysis

外文摘要：Iodine and nitrogen co-doped carbon quantum dots (I,N-CQDs) with an average size of 2.6 nm were synthesized via a solvent-free pyrolysis method, using iodine-rich laver (marine algae of the genus Porphyra) as a sustainable biomass precursor and urea as the nitrogen source. The optimized I,N-CQDs achieved a fluorescence quantum yield of 8.01 % and demonstrated high selectivity for Fe3+ detection based on a fluorescence quenching mechanism. A linear quenching response was observed within the Fe3+concentration range of 0-400 mu M (R2 = 0.999), with a detection limit as low as 0.89 mu M. The practical applicability of the sensing system was verified through spike-and-recovery tests in environmental water samples, achieving recoveries between 95.82 % and 103.42 % and relative standard deviations (RSD) of 0.53 %-8.60 %, confirming its reliability for real-world analysis. The quenching mechanism was attributed to synergistic dynamic quenching and inner filter effects. Beyond sensing, the I,N-CQDs also demonstrated multifunctional characteristics, including enhanced photocatalytic performance in the degradation of methylene blue and successful incorporation into polyvinyl alcohol (PVA) matrices to produce flexible fluorescent composite films. These findings highlight the potential of I,NCQDs for environmental monitoring and advanced material applications.