Abstract:
:Erythromycin has been widely used in food-producing animals and in humans, and is frequently detected as an organic pollutant in U.S. streams. In batch experiments with homoionic clays, the Freundlich isotherms were determined at 10 and 25 degrees C. The adsorption of erythromycin A was strongly influenced by clay type, exchanged cations, the pH of the bulk solutions, and the acidity of clay surfaces. The formation of clay-erythromycin A complexes was thermodynamically favorable except for K+- and Fe3+-exchanged montmorillonites, since the reactions were exothermic (deltaH(o) > 0) and the systems became stable (deltaS(o) > 0). Clays catalyzed the erythromycin A degradation by the hydrolysis of the neutral sugar and the multiple dehydrations. The surface acidity of clay surface enhanced the rate of clay-catalyzed degradation of erythromycin A. In addition, the Fe3+-exchanged clay minerals seemed to have an electrostatic interaction with the erythromycin A molecule, by which the hydrolysis of the neutral sugar was influenced.
journal_name
J Environ Qualjournal_title
Journal of environmental qualityauthors
Kim YH,Heinze TM,Kim SJ,Cerniglia CEdoi
10.2134/jeq2004.2570subject
Has Abstractpub_date
2004-01-01 00:00:00pages
257-64issue
1eissn
0047-2425issn
1537-2537journal_volume
33pub_type
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