Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.14279/1417
Title: Application of immobilized titanium dioxide photocatalysts for the degradation of creatinine and phenol, model organic contaminants found in NASA's spacecrafts wastewater streams
Authors: Dionysiou, Dionysios Demetriou D. 
Antoniou, Maria G. 
metadata.dc.contributor.other: Αντωνίου, Μαρία Γ.
Major Field of Science: Engineering and Technology
Keywords: Creatinine;Titanium dioxide;Phenol;Sewage;Carbon
Issue Date: 30-Jun-2007
Source: Catalysis today, 2007, vol. 124, no. 3–4, pp. 215–223
Volume: 124
Issue: 3-4
Start page: 215
End page: 223
Journal: Catalysis Today 
Abstract: In this project, immobilized titanium dioxide photocatalysis was utilized as a post-treatment technology for the destruction of model organic contaminants found in wastewater streams produced on-board during space exploration. Phenol, a known human carcinogen, and creatinine, a human metabolite found in urine, were the compounds tested in this study. Phenol and creatinine have cyclic structures consisting of six and five member rings, respectively. In addition, creatinine is a methyl guanidine derivative, with almost 40% (w/w) nitrogen. The degradation and carbon mineralization efficiencies of the target contaminants were investigated at different initial concentrations. Their photocatalytic degradation appears to follow pseudo-first-order reaction with phenol giving higher organic carbon reduction rates than creatinine. The presence and position of the functional groups of creatinine (amine, imine and peptide bond) are primarily responsible for the significantly slower mineralization. The degradation of creatinine was also tested at different pHo values. Statistical analysis showed that there is an effect of pH on the treatment of creatinine. Besides the carbon mineralization, the extent of nitrogen mineralization and the mass balance of nitrogen were conducted for three pH values (pHo 3.0, 6.2 and 11.0). Overall, the transformation of nitrogen was low, and the total maximum conversion (<20%) occurred at basic conditions
URI: https://hdl.handle.net/20.500.14279/1417
ISSN: 09205861
DOI: 10.1016/j.cattod.2007.03.054
Rights: © Elsevier
Type: Article
Affiliation: University of Cincinnati 
Affiliation : University of Cincinnati 
Publication Type: Peer Reviewed
Appears in Collections:Άρθρα/Articles

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