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Findings from V.R. de Mendonca et al in Photocatalytics Reported

February 3, 2014

By a News Reporter-Staff News Editor at Clinical Trials Week -- Current study results on Photocatalytics have been published. According to news reporting from Sao Paulo, Brazil, by NewsRx journalists, research stated, "Despite photocatalytic degradation is studied generally focusing the catalyst, its interaction with the contaminant molecule plays a fundamental role in the efficiency of that process. Then, we proposed a comparative study about the photodegradation of two well-known dyes, with different acidity/basicity - Methylene Blue (MB) and Rhodamine B (RhB), catalyzed by TiO2 nanoparticles, varying both dye and photocatalyst concentrations."

The news correspondents obtained a quote from the research, "The results showed that the amphoteric character of MB molecules, even in a range of concentration of 5.0-10.0mgL(-1), did not imply in pH variation in solution. Therefore, it did not affect the colloidal behavior of TiO2 nanoparticles, independent of the relative dye/catalyst concentration. The acid-base character of RhB influenced the resultant pH of the solution, implicating in different colloidal behavior of the nanoparticles and consequently, in different degradation conditions according to dye concentration."

According to the news reporters, the research concluded: "As the isoelectric point of TiO2 is between the pH range of the RhB solutions used in this study, from 1.0 to 7.5mgL(-1), the resultant pH was the key factor for degradation conditions, from a well dispersed to an agglomerated suspension."

For more information on this research see: The Role of the Relative Dye/Photocatalyst Concentration in TiO2 Assisted Photodegradation Process. Photochemistry and Photobiology, 2014;90(1):66-72. Photochemistry and Photobiology can be contacted at: Wiley-Blackwell, 111 River St, Hoboken 07030-5774, NJ, USA. (Wiley-Blackwell -; Photochemistry and Photobiology -

Our news journalists report that additional information may be obtained by contacting V.R. de Mendonca, Embrapa Instrumentat, Sao Paulo, Brazil. Additional authors for this research include H. Mourao, A.R. Malagutti and C. Ribeiro (see also Photocatalytics).

Keywords for this news article include: Brazil, Sao Paulo, Nanoparticle, South America, Photocatalyst, Nanotechnology, Emerging Technologies, Clinical Trials and Studies

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Source: Clinical Trials Week

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