Characterization of DOM adsorption of CNTs by using excitation-emission matrix fluorescence spectroscopy and multiway analysis.
Carbon nanotubes (CNTs) were utilized to adsorb DOM in micro-polluted water. The characteristics of DOM adsorption on CNTs were investigated based on UV254, 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.
a School of Environmental and Safety Engineering , Changzhou University , Changzhou , People's Republic of China.
Mingguo
M
Peng
a School of Environmental and Safety Engineering , Changzhou University , Changzhou , People's Republic of China.
Huajie
H
Li
a School of Environmental and Safety Engineering , Changzhou University , Changzhou , People's Republic of China.
Dongdong
D
Li
a School of Environmental and Safety Engineering , Changzhou University , Changzhou , People's Republic of China.
Erdeng
E
Du
a School of Environmental and Safety Engineering , Changzhou University , Changzhou , People's Republic of China.
Zhihong
Z
Li
D000327:Adsorption; D006812:Humic Substances; D037742:Nanotubes, Carbon / Q000737:chemistry*; D016062:Porosity; D045483:Rivers / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D014873:Water Pollutants / Q000737:chemistry*
D006812:Humic Substances; D037742:Nanotubes, Carbon; D014873:Water Pollutants
Carbon nanotubes; adsorption; dissolved organic matter (DOM); fluorescence excitation–emission matrix (EEM); parallel factor (PARAFAC) analysis