Evaluation of different conducting substrates for modification with TiO2 (P25) nanoparticulate films aiming the photocatalytic degradation of the organic model system potassium hydrogen phthalate

• Grant number: 18/00560-0
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: March 01, 2018
• End date: November 30, 2018
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Analytical Chemistry
• Principal Investigator: Ivano Gebhardt Rolf Gutz
• Grantee: Lucas Diegues Cordon
• Host Institution: Instituto de Química (IQ). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

The conventional water treatment applied today, for potabilization or sewage treatment, is unsatisfactory to the abatement of a series of compounds belonging to the class of so-called emerging pollutants. In many cases, the routine monitoring of all these species proves to be impracticable for time and cost reasons, among others, leaving a possibility of using a non-specific parameter for their global representation. One of them, applied for organics, is a Chemical Oxygen Demand (COD). Modern methods for its determination, such as UV photo-oxidation process mediated by nanoparticulate TiO2 immobilized on a conductive substrate allow the coulometric determination of the charge for oxidation. This process is also an innovative method for the abatement of organic pollutants neglected by the conventional treatment of water, with the advantage of avoiding the addition of reagents. However, a very limited number of conductive substrates that are relatively expensive for large-scale use have been pointed out as favorable for bedding the photocatalyst, among them ITO (indium tin oxide), FTO (fluorinated tin oxide-Doped) and gold. The main objective of this work is to extend the cold modification protocol of Au with TiO2 (P25), recently developed by the group, to Ag, Cu, Pd, Pt and Glassy Carbon, by evaluating the resulting photocatalytic activity for the degradation of the model pollutant, hydrogen-phthalate (KHP), a primary standard for determination of COD by the conventional dichromate method, and, on the other hand, precursor compound in the class of endocrine disrupters of phthalate esters.

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

BACCARO, ALEXANDRE L. B.; SEKI, CAROLINA C.; NISHIMURA, FELIPE G.; CORDON, LUCAS D.; CARVALHO, LARISSA A. C.; GUTZ, IVANO G. R.. Effectiveness of metal-EDTA-polluted water treatment and metal recovery at drop-casted films of TiO2 under UV-LED irradiation: A photoelectrochemical study. RESULTS IN CHEMISTRY, v. 5, p. 13-pg., 2023-01-28. (18/00560-0)