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Adsorption of dissolved organic matter onto activated carbon--the influence of temperature, absorption wavelength, and molecular size
Authors:Schreiber Bernd  Brinkmann Thomas  Schmalz Viktor  Worch Eckhard
Affiliation:Institute of Water Chemistry, Dresden University of Technology, 01062 Dresden, Germany
Abstract:In this study, batch and column adsorption experiments with granular activated carbon (GAC) were carried out for removing dissolved organic matter (DOM) of a pond water at different water temperatures (5, 20, and 35 °C). The water was characterized before and after the adsorption step using UV/VIS spectroscopy and size-exclusion chromatography (SEC) combined with diode array detection (DAD). DOM breakthrough of GAC filters has been found to be slower at higher water temperatures, the DOM removal being most effective at 35 °C. UV/VIS spectra and SEC chromatograms of water samples treated at different water temperatures indicate that an increase in temperature especially supports the adsorption of small DOM molecules as well as molecules absorbing at higher wavelengths, specifying aromatic structures of DOM. SEC-DAD has been demonstrated to be an efficient method for characterizing DOM of natural waters and for detecting relative changes of DOM during the water treatment process.
Keywords:Activated carbon   Adsorption   Dissolved organic matter   Size-exclusion chromatography   UV/VIS spectroscopy   Temperature dependence
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