Visible-Light Activation of Persulfate or H2O2 by Fe2O3/TiO2 Immobilized on Glass Support for Photocatalytic Removal of Amoxicillin: Mechanism, Transformation Products, and Toxicity Assessment (original) (raw)

Comparison of two synthesis methods on the preparation of Fe, N-Co-doped TiO 2 materials for degradation of pharmaceutical compounds under visible light

In this work, we report the synthesis, characterization and photocatalytic evaluation of visible light active iron-nitrogen co-doped titanium dioxide (Fe 3+-TiO 2−x N x) nanostructured catalyst. Fe 3+-TiO 2−x N x was synthesized using two different chemical approaches: sol-gel (SG) and microwave (MW) methods. The materials were fully characterized using several techniques (SEM, UV–Vis diffuse reflectance DRS, X-ray diffraction XRD, and X-ray photoelectron spectroscopy XPS). The photocatalytic activity of the nanostructured materials synthesized by both methods was evaluated for the degradation of amoxicillin (AMX), streptomycin (STR) and diclofenac (DCF) in aqueous solution. Higher degradation efficiencies were encountered for the materials synthesized by the SG method, for instance, degradation efficiencies values of 58.61% (SG) and 46.12% (MW) were observed for AMX after 240 min of photocatalytic treatment under visible light at pH 3.5. With STR the following results removal efficiencies were obtained: 49.67% (SG) and 39.90% (MW) at pH 8. It was observed the increasing of degradation efficiencies values at longer treatment periods, i.e., after 300 min of photocatalytic treatment under visible light, AMX had a degradation efficiency value of 69.15% (MW) at pH 3.5, DCF 72.3% (MW) at pH 5, and STR 58.49% (MW) at pH 8.

Photoperoxidation of ciprofloxacin antibiotic in aqueous medium using Fe3-XO4-Y-TiO2 particles as catalyst

Ecl�tica Qu�mica Journal

Conventional treatment processes are not effective in removing micropollutants such as antibiotics and other drugs present in wastewater, and degradation methods based on advanced oxidative processes become attractive. Herein, it was synthesized Fe3-xO4-y-TiO2 particles by coprecipitation method and they were heat-treated at 100, 400, and 800 �C. The obtained solids were characterized by X-ray diffraction and thermogravimetric analysis and analytical determinations were performed using ultraviolet-visible (UV-Vis) spectrophotometry. The particles were evaluated in photoperoxidation processes on the degradation of the ciprofloxacin antimicrobial in an aqueous solution. The studies took place at pH 9; with an H2O2 concentration of 31 mg L�1 and particle mass 0.22 g L�1 previously defined and, in these conditions, degradation percentages between 40 and 85% were observed, with the removal in the Photo/H2O2/Fe3-xO4-y-TiO2 800 �C. The kinetic study performed for this process revealed the ...

SINTEZA NANOPARTICULELOR COMPOZITE Fe3O4 - TiO2 PENTRU FOTODEGRADAREA AMPICILINEI SI PENICILINEI G SYNTHESIS OF Fe3O4 - TiO2 COMPOSITE NANOPARTICLES FOR AMPICILLIN AND PENICILLIN G PHOTO-DEGRADATION

2015

AURELIA CRISTINA NECHIFOR, ABBAS ABDUL KADHIM KLAIF RIKABI, DANIELA DUMITRA CLEJ, SZIDONIA-KATALIN TANCZOS, CORNELIU TRIŞCĂ-RUSU, CRISTINA ORBECI∗ Universitatea Politehnica Bucuresti, Str. G. Polizu nr. 1-7, 011061, Bucuresti, România 2 Fundation of Technical Education, Baghdad, Iraq 3 Universitatea Sapientia Miercurea Ciuc, Piata Libertatii nr. 1, 530104, Harghita, România Institute for Research and Development in Microtechnologies, Str. Erou Iancu Nicolae nr. 126A, 077190, Bucuresti, România