Influência do pH da solução precursora na agregação macromolecular e na fotodegradação de nanocompósitos de protoporfirina IX Sal dissódico/Haloisita

Abstract

In this final project, functional photoluminescent hybrid materials made up of nanocomposites of protoporphyrin IX disodium salt and clay nanoparticles were made and analyzed. The results of the PL spectra and photodegradation curves showed that the pH of the precursor solution directly influences both the level of aggregation of the protoporphyrin molecules adsorbed to the surface of the halloysites and the photodegradation processes. The pH2 solution proved to be much more efficient at disaggregating the protoporphyrin molecules than the pH7 solution. It was also observed that the line shape of the PL spectra is greatly influenced by both the excitation wavelength and the pH of the precursor solution, probably due to the different aggregation states of the protoporphyrin molecules in each system.