Resumo

RIVAS, Carlos F; NUNEZ, Oswaldo  e  VARGAS, Ronald. Oxidation of p-nitrophenol using Tio₂-adenosin monophosphate. Saber [online]. 2014, vol.26, n.4, pp.458-464. ISSN 1315-0162.

The surface of TiO₂ was modified with the nucleotides adenosine 3’-monophosphate (AMP’3) and Adenosine 5’-monophosphate (AMP’5). The adsorption of nucleotides was adjusted to Langmuir´s adsorption model, determining that the optimal condition for TiO₂ modification was at neutral pH. UV-Visible Diffuse Reflectance and IR Attenuated Total Reflectance spectra show that the chemisorption of nucleotides take placed on TiO₂ anatase. The new catalysts (TiO₂-nucleotide) improved the photodegradation of p-nitrophenol in a wide range of pH as compared with the titanium dioxide precursor. Most photoactivity was generated by using the new photocatalytic in the degradation of p-nitrophenol at pH = 6, obtaining high values for the pseudo first order kinetic constant (0.0254 min-1 and 0.0244 min-1 for TiO₂-AMP’3 and TiO₂-AMP’5, respectively). For all pH, the trend obtained for the photodegradation was: TiO₂-AMP´3 TiO₂-AMP’5 > TiO₂. Langmuir-Hinshelwood kinetics shows that the contribution of the surface reaction rate governs the oxidation of the contaminant.

Palavras-chave : TiO₂ anatase; photodegradation; p-nitrophenol; nucleotide.

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