Department of Chemistry and Environmental Sciences, Institute of Biosciences, Humanities and Exact Sciences, São Paulo State University (UNESP), São José Do Rio Preto, São Paulo, Brazil.
Department of Physics, Institute of Biosciences, Humanities and Exact Sciences, São Paulo State University (UNESP), São José Do Rio Preto, São Paulo, Brazil.
J Fluoresc. 2022 Sep;32(5):1761-1767. doi: 10.1007/s10895-022-02978-3. Epub 2022 Jun 9.
Described is the enhancement of fluorescence intensity due to the interaction of a humic-like substance (HLS 1%) extracted from process water (PW) and Cd(II) ions in aqueous solution. Using Canonical Polyadic/Parallel Factor Analysis (CP/PARAFAC), two main components were seen that contributed to fluorescence, the first one increased it and the second one kept it constant in both static and dynamic fluorescence studies. Two-dimensional FTIR analysis indicated that the interaction of HLS 1% and Cd(II) ions occurred in the following order of affinity with the groups: C-O bonds in polysaccharides > C-O bonds in carboxylic acid. The results obtained suggest that the increase in fluorescence intensity and lifetime suggest a photoinduced charge transfer (PCT) between Cd(II) ions and carboxylic acid groups present in HLS 1%.
描述了一种腐殖质类似物（HLS 1%）在水溶液中与 Cd(II) 离子相互作用导致荧光强度增强的现象。使用典范多线性/平行因子分析（CP/PARAFAC），发现了两个主要的荧光贡献成分，第一个成分增加了荧光强度，而第二个成分在静态和动态荧光研究中保持不变。二维傅里叶变换红外分析表明，HLS 1%与 Cd(II)离子的相互作用按以下亲和性顺序发生：多糖中的 C-O 键 > 羧酸中的 C-O 键。研究结果表明，荧光强度和寿命的增加表明 Cd(II)离子与 HLS 1%中存在的羧酸基团之间发生了光诱导电荷转移（PCT）。
