Photo-Oxidation of Tetracycline Adsorbed in Clayand in Aqueous Suspension

Josy Antoveli Osajima; Edson Cavalcanti da Silva Filho; Norel H. Belhouchat; Esperanza C. Gil; Cesar A.V. Iborra

doi:10.4028/www.scientific.net/MSF.930.552

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HomeMaterials Science ForumMaterials Science Forum Vol. 930Photo-Oxidation of Tetracycline Adsorbed in...

Photo-Oxidation of Tetracycline Adsorbed in Clayand in Aqueous Suspension

Abstract:

The resistance of some compounds to conventional treatments engenders the search for alternative methods, such as photo-oxidation. Antibiotics and photo-producers are found in the environment, indicating that these compounds are persistent. This work had as its goal to investigate the photo-oxidation of the antibiotic named tetracycline hydrochloride adsorbed in montmorilloniteclay (VHS) and into aqueous suspension. In order to irradiate the interaction products 0,03g were weighed and put in a petri dish to be collected on pre-determined times. The extraction of the drug was made by adding 10 mL of distilled water and put on the ultrasound for 2 hours. The suspensions were prepared by using 200 mL of the concentration from 25mgL^-1of tetracycline in 1gL^-1 g of clay in a borosilicate reactor. This system was stirred in the dark during 1 hour in order to achieve its balance. The samples were radiated by using an Ultra-Vitalux UV lamp, with 300 W for 2 hours. The kinetics were followed through UV-Vis spectroscopy, monitored in 359 nm, in the maximum wavelength of the drug. The suspensions showed a degradation twice as fast when compared to the interaction product, for the rate of degradation of this system was 24%. This decrease on the concentration may have been caused by the hydroxyl radicals generated by the photolysis of the iron hydroxide II. Hence, one concludes that in the case of the system in suspension it was more effective to the photo-oxidation of this antibiotic. Although, there is the need for increasing the exposure time of the interaction product in order to verify possible structural changes of this system by DRX.

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22nd Brazilian Conference on Materials Science and Engineering

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Materials Science Forum (Volume 930)

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552-555

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.930.552

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Online since:

September 2018

Authors:

Josy Antoveli Osajima*, Edson Cavalcanti da Silva Filho, Norel H. Belhouchat, Esperanza C. Gil, Cesar A.V. Iborra

Keywords:

Drug, Estability, Radiation

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