Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 193, Issue -, Pages 128-138Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2011.07.039
Keywords
Abiotic degradation; Chlortetracycline; delta-MnO(2); Kinetics; Products
Categories
Funding
- Major State Basic Research Development Program [2007CB936604]
- National Natural Science Foundation of China [20707029, 40671093]
- Natural Scientific and Technical Supporting Program [2006BAD10B05]
- Chinese Academy of Sciences [KSCX2-YW-N-51-02]
Ask authors/readers for more resources
This study investigated the abiotic transformation kinetics of chlortetracycline (CTC) by synthesized delta-MnO(2) under conditions of different solutions. CTC was rapidly oxidized by delta-MnO(2), with the generation of Mn(2+). The measured CTC transformation rate increased considerably with an increase in initial delta-MnO(2) concentration but it decreased as the initial CTC concentration increased. Both the measured CTC transformation rate and the amount of Mn(2+) generated decreased with increasing pH. The CTC transformation rate rose with an increase in temperature. The apparent activation energy (45 +/- 14 kJ mol(-1)) was consistent with a surface-controlled reaction. Dissolved Mn(2+) and Zn(2+), as background cations, and substituted phenols, as co-solutes, remarkably decreased the transformation rate of CTC. Liquid chromatography-tandem mass spectrometry (LC-MS-MS) was used to identify oxidation products, which include iso-CTC, 4-epi-CTC, anhydro-CTC and 4-epi-anhydro-CTC, keto-CTC, 4-epi-keto-CTC. N-demethyl-CTC, 4-epi-N-demethyl-CTC, N-didemethyl-CTC and 4-epi-N-didemethyl-CTC. Product identification together with Fourier transform-infrared (FTIR) spectra suggested that the hydroxyl groups at C6 and C12 and the dimethylamine group of CTC reacted with the Mn-OH groups on the delta-MnO(2) surface. Thus, delta-MnO(2) in the soils most probably plays an important role in the abiotic transformation of tetracycline antibiotics. (C) 2011 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available