Day 1 :
IMDEA Energy Institute, Photoactivated Processes Unit, Av. Ramón de la Sagra 3, 28935 Móstoles, Spain.
Keynote: Hybrid Organic-Inorganic Photoanodes Based on Conjugated Porous Polymers Prepared by Electropolymerization
Time : 10.00-10.40
Artificial photosynthesis by photoelectrocatalysis is one of the most promising waysto store solar energy in the form of fuels, thus constituting a sustainable alternative to fossil fuels. The photoelectrodes used in this technique have to be designed according to the optoelectronic properties of their components in order to direct charge carriers to the reaction sites (minimizing electron-hole recombination), increase light absorption and/or promote catalysis on their surface.1,2 Conjugated polymers (CPs) are used as part of some photoelectrodes due to their good conductivity and the possibility to tailor their optoelectronic properties at the molecular level. Some of the most used CPs, such as PEDOT, have a linear structure; which makes them easy to process as thin films, but also unstable under UV illumination if they are in contact with water.3 This fact limits their use to buried junctions in well protected photoelectrodes. On the other hand, Conjugated Porous Polymers(CPP)3–5 show higher stability due to their 3D structure, which makes them promising and still untapped materials for artificial photosynthesis. However, it is difficult to produce thin films with them by conventional methods such as drop casting or spin coating because of their morphology. Thanks to the electropolymerization process, we are able to prepare homogeneous, transparent and light-absorbing CPP films both on conducting glass substrates and on inorganic semiconductors such as BiVO4 or TiO2. One of these CPPs, IEP-19, has been synthesized for the first time and it shows promising photocurrents, which are significantly higher than those of a previously known CPP with a similar structure: CPP-3TB. Moreover, hybrid photoanodes where the CPP is electropolymerized on top of the inorganic semiconductor present higher photocurrents than the semiconductors alone, showing a synergistic effect between the organic and inorganic semiconductors. In order to further improve the photoresponse of the hybrid photoanodes, samples with different oxide thicknesses where studied. Finally, optimal thicknesses were reached. All these results will be explained according to the optical, photoelectrochemical and morphological properties of the photoanodes
Sultan Moulay Slimane University, Laboratory of Chemistry and Environnement, Khouribga 25 000, Morocco
Time : 10-40-11.20
ASMAA HRIOUA, studied Analytical Chemistry and Environment at Mohamed V University , Rabat, Morocco, holds a master's degree in collaboration with University Paul Sabatier in Toulouse, France. Currently I am a phD student in the laboratory of Chemistry and Environnement at the Sultan Moulay Slimane University, Morocco, with research group of Prof. Moulay Abderrahim El Mhammedi (they has published more than 90 research articles in SCI(E) journals.)
Amoxicillin (AMX) is among the most successful antibiotics used for human therapy. It has a particular importance due to their effective against a wide spectrum of bacterial infections. In the recent years, the interactions between amoxicillin and metal ions have special interest due to their potential applications. It has been demonstrated that amoxicillin interact effectively with several metal ions due to the presence of a number of donor sites as several O- and N-containing functional groups in its chemical structure. Many studies have reported metal-AMX complex formation using spectroscopic and thermal methods. However, no electrochemical studies of the effect of metal ions on the redox chemistry of AMX have been reported.
In this work, the reaction of AMX with transition metals such as Cu(II), Zn(II) and Fe(III) has been investigated electrochemically at graphite electrode (CPE) in phosphate buffer solution (PBS ; pH = 7). This interaction was investigated using square wave voltammetry (SWV). The electrochemical results proved that the oxidation processes of amoxicillin could be affected by transition metals complexation. The formation of Metal-AMX complexes was examined by SWV and the observed results were confirmed using UV-visible spectroscopy.