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Characterization of DOM adsorption of CNTs by using excitation–emission matrix fluorescence spectroscopy and multiway analysis
- Peng, Mingguo, Li, Huajie, Li, Dongdong, Du, Erdeng, Li, Zhihong
- Environmental technology 2017 v.38 no.11 pp. 1351-1361
- adsorbents, adsorption, carbon nanotubes, environmental technology, fluorescence, fluorescence emission spectroscopy, models, sorption isotherms, temperature, thermodynamics
- Carbon nanotubes (CNTs) were utilized to adsorb DOM in micro-polluted water. The characteristics of DOM adsorption on CNTs were investigated based on UV ₂₅₄, TOC, and fluorescence spectrum measurements. Based on PARAFAC (parallel factor) analysis, four fluorescent components were extracted, including one protein-like component (C4) and three humic acid-like components (C1, C2, and C3). The adsorption isotherms, kinetics, and thermodynamics of DOM adsorption on CNTs were further investigated. A Freundlich isotherm model fit the adsorption data well with high values of correlation. As a type of macro-porous and meso-porous adsorbent, CNTs preferably adsorb humic acid-like substances rather than protein-like substances. The increasing temperature will speed up the adsorption process. The self-organizing map (SOM) analysis further explains the fluorescent properties of water samples. The results provide a new insight into the adsorption behaviour of DOM fluorescent components on CNTs.