title: Characterization of fluorescent-dissolved organic matter and identification of specific fluorophores in textile effluents.
abstract: This study focused on the characterization of fluorescent-dissolved organic matter and identification of specific fluorophores in textile effluents. Samples from different textile wastewater treatment plants were characterized by high-performance liquid chromatography and size exclusion chromatography as well as fluorescence excitation-emission matrix spectra. Despite the highly heterogeneous textile effluents, the fluorescent components and their physicochemical properties were found relatively invariable, which is beneficial for the combination of biological and physicochemical treatment processes. The humic-like substance with triple-excitation peaks (excitation (Ex) 250, 310, 365/emission (Em) 460 nm) presented as the specific fluorescence indicator in textile effluents. It was also the major contributor to UV absorbance at 254 nm and resulted in the brown color of biologically treated textile effluents. By spectral comparison, the specific fluorophore in textile effluents could be attributed to the intermediate structure of azo dyes 1-amino-2-naphthol, which was transferred into the special humic-like substances during biological treatment.
authors.affiliation: State Key Laboratory of Pollution Control and Resources Reuse, Collaborative Innovation Center for Advanced Water Pollution Control Technology and Equipment, School of the Environment, Nanjing University, Nanjing, 210023, China.
authors.forename: Wentao
authors.initials: W
authors.lastname: Li
authors.forename: Zixiao
authors.initials: Z
authors.lastname: Xu
authors.forename: Qian
authors.initials: Q
authors.lastname: Wu
authors.forename: Yan
authors.initials: Y
authors.lastname: Li
authors.forename: Chendong
authors.initials: C
authors.lastname: Shuang
authors.forename: Aimin
authors.initials: A
authors.lastname: Li
mesh_terms: D002850:Chromatography, Gel; D005453:Fluorescence; D005456:Fluorescent Dyes / Q000737:chemistry*; D006812:Humic Substances / Q000032:analysis; D007220:Industrial Waste / Q000032:analysis*; D013050:Spectrometry, Fluorescence / Q000379:methods; D013784:Textiles; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D005456:Fluorescent Dyes; D006812:Humic Substances; D007220:Industrial Waste; D014874:Water Pollutants, Chemical