Treatment of laboratory residues by heterogeneous photocatalysis with TiO2

Carlos F. Granda-Ramírez, Gina M. Hincapié-Mejía, Stephanía Lopera-Uribe


Environmental pollution caused by generation of hazardous waste is a growing and globalized problem. Hazardous waste, once emitted, can remain in the environment for hundreds of years. In the diferent laboratories, chemical substances are handled and several operations are carried out that lead to the generation of waste, which in most cases are dangerous to health and the environment; within these residues are those generated in the procedures of Gram staining.
In this paper, an alternative for the treatment of residues of Gram staining by Heter-ogeneous Photocatalysis (HP) is presented. Evonik® TiO2 P-25 was used and as a radia-tion source a germicidal lamp; In addition, UV - Vis spectroscopy was used as analysis techniques, accompanied by COD measurements.
In view of the nature of these residues, it was determined to treat them in concentra-tions lower than the real ones (diluted to 10 %), with TiO2 dosages according to the liter-ature in processes with dyes; reaching in 2 hours a degradation around 70 % and a reduc-tion of the COD of 40 %, showing the feasibility of the possible implementation of this process in its elimination.


Gram staining; Heterogeneous Photocatalysis; Hazardous waste; titanium dioxide

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