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1.
In situ treatment of organic pollutants in water using photoelectrocatalysis
Saim Emin, Takwa Chouki, Manel Machreki, 2022, published scientific conference contribution abstract (invited lecture)

Abstract: The photoelectrochemical (PEC) approach has emerged as a promising advanced oxidation process to remove organic pollutants in water environment. Here, we report a novel method for the preparation of hematite (α-Fe2O3) thin films by using a combination of spin-coating and heat-treatment approaches. Firstly, a solution containing iron precursor was spin-coated on fluorine doped tin oxide substrates and later heat-treated at 750º C to generates a porous film.1 The α-Fe2O3 thin films were studied as a catalyst in PEC water oxidation and textile dye degradation system We applied the α-Fe2O3 thin films in PEC degradation of a textile Basic Blue 41 (B41) dye. Efficient PEC degradation of B41 dye is demonstrated in the presence of reactive chlorine species (RCS) under LED illumination (λex  400 nm, 20 W) and 1.5 V vs. reversible hydrogen electrode applied potential. In addition to Fe2O3, we also grew TiO2 nanotubes on titanium plate using the so-called anodization approach. We applied the obtained TiO2 thin films in PEC degradation of B41 dye. In addition to the B41 textile dye, we used also used the TiO2 nanotubes for degradation of anti-inflammatory drugs. Various operation parameters, including anodic potential, pH, electrolytes and concentration of dye, were investigated to determine the optimal experimental conditions. The degradation of B41 was remarkably enhanced by in situ generated RCS. Recycling test revealed that α-Fe2O3 photoanode shows good activity and excellent stability during B41 degradation. High-performance liquid chromatography analysis coupled with UV-VIS system and gas-chromatography/liquid chromatography coupled to mass spectrometry detector confirmed the degradation of B41 dye and the evolution of by-product. Phytotoxicity test using Lepidium sativum L showed that treated waters are safe to be discharged in the environment.
Keywords: photoelectrocatalysis, Fe2O3 thin films, basic blue dye 41
Published in RUNG: 10.01.2025; Views: 116; Downloads: 0
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2.
Disinfection of wastewater using porous Fe2O3 thin film : master's thesis
Ranin M. D. Ismail, 2024, master's thesis

Abstract: The contamination of water bodies by microorganisms is seen as a highly significant issue that poses a threat to human and animal well-being. The primary objective of this master thesis is to develop and evaluate an environmentally friendly photoelectrochemical (PEC) method using porous Fe₂O₃ thin films for the disinfection of wastewater. This thesis presents the novel application of porous Fe₂O₃ thin films, which were produced using a cost-effective spin-coating technique, to improve the process of PEC disinfection. The PEC approach has been demonstrated to be highly effective in disinfection of wastewaters deliberately contaminated with E. coli bacteria. The crystallinity of the Fe₂O₃ porous thin films was confirmed using X-ray diffraction (XRD), while the film morphology was studied using scanning electron microscopy (SEM). The PEC disinfection procedures were conducted in the presence of two separate electrolytes, sodium sulfite (Na₂SO₃) and sodium chloride (NaCl), which were chosen for their specific roles in improving the effectiveness of disinfection. The PEC method shown efficacy in inactivating E. coli, with 45% of the bacteria being inactivated in the presence of 2 mM Na₂SO₃ and complete inactivation achieved with 20 mM NaCl. The findings suggest that the PEC disinfection process is a highly efficient and eco-friendly technology that can be used as a practical substitute for traditional disinfection methods. As a result, it has potential applications in ensuring public safety and safeguarding the environment, particularly in relation to wastewater treatment.
Keywords: Treated wastewater, Disinfection, Escherichia coli, Photoelectrochemical oxidation, Fe2O3 thin films, Sodium sulfite and Sodium chloride.
Published in RUNG: 09.09.2024; Views: 996; Downloads: 16
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