Sonocatalytic Degradation of Antibiotics Tetracycline by Mn-Modified DiatomiteReport as inadecuate




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Journal of Chemistry - Volume 2017 2017, Article ID 2830138, 8 pages - https:-doi.org-10.1155-2017-2830138

Research ArticleDepartment of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, China

Correspondence should be addressed to Yiping Guo

Received 7 September 2016; Revised 28 October 2016; Accepted 23 November 2016; Published 23 January 2017

Academic Editor: Mohammad A. Al-Ghouti

Copyright © 2017 Yiping Guo et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Mn-modified diatomite was prepared by wet impregnation and subsequent calcinations processes. It was used as catalyst for sonocatalytic degradation of antibiotics tetracycline. Characterizations by scanning electron microscopy and X-ray diffraction pattern showed that the morphology and crystal structure of the modified diatomite were similar to these of raw diatomite. Despite containing very limited amount of Mn oxides, the Mn-modified diatomite showed much higher sonocatalytic activity than the raw diatomite. The increases in both MnSO4 concentration of the wet impregnation solution and the catalyst dosage could enhance the degradation of antibiotics tetracycline significantly. values for ultrasonication, catalyst adsorption, and both processes combined 0.10 mol-L MnSO4-modified diatomite were 1.22 × 10

, 0.00193, and 0.00453 min

, respectively, while the corresponding values of were 0.956, 0.986, and 0.953, respectively. These results demonstrated the significant synergetic effect by combining ultrasonication and catalyst adsorption processes. The presence of isopropanol, KBr, and NaN3 quenched a series of reactive oxygen species sharply, indicating the dominant role of reactive oxygen species in the sonocatalytic process. In contrast, the addition of FeII enhanced the degradation due to the generation of more radicals in the concurrent Fenton reaction. All the results indicated that Mn-modified diatomite had the great potential for water treatment by sonocatalytic oxidation.





Author: Yiping Guo, Xiao Mi, Guoting Li, and Xi Chen

Source: https://www.hindawi.com/



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