MSc Students Presentations - Alexandra Ioannidi
In recent decades due to the rapid development of analytical chemical techniques, traces of many resistant substances have been identified in environmental samples. The concentration of these pollutants is of the order of ng/L–μg/L and, therefore, they are called micropollutants. Among various micropollutants, parabens have been accused of having a potential impact on human and animal health. According to some studies, parabens have a weak estrogenic effect mimicking the hormones secreted by the human body and they are classified as endocrine disruptors Parabens have various uses, mainly in the cosmetics industry, as well as food preservatives.
UV-A light emitting diodes (LEDs: 10W of nominal power, 7.9 10−7 einstein/(L s) photon flux) were employed as the radiation source to activate sodium persulfate (SPS) for the degradation of endocrine disruptor propyl paraben (PP). Experiments in ultrapure water (UPW) were conducted varying SPS concentration between 0 and 500 mg/L, PP concentration between 100 and 800 μg/L, initial solution pH between 3.2 and 9.2, as well as adding various organic (alcohols and humic acid) and inorganic (bicarbonate, chloride), non-target species. Besides UPW, experiments were performed in two actual matrices, i.e. secondary treated wastewater and bottled water. Degradation was found to increase with increasing SPS concentration and decreasing PP concentration, while it was favored as near-neutral, inherent solution pH.
The addition of methanol and t-butanol, known radical scavengers, partly restricted the reaction, thus implying that both sulfate and hydroxyl radicals are formed and participate in PP degradation. The addition of humic acid in UPW completely quenched the reaction and so did the use of wastewater as the water matrix. Less significant were the effects of bicarbonate and chloride. SPS can also be activated by the UV-A part of simulated solar radiation (7.3 10−7 einstein/(L s) photon flux), potentially improving process sustainability.
Speakers Short CV (Σύντομο Βιογραφικό Ομιλητή)
Name: Alexandra Ioannidi
Date of Birth 03/01/1992
Adress: Prigkiponisson 20, Patra, 6226,Greece
Internship in General Laboratory (Athens) in the section materials and food (15/07/2014 – 31/08/2014)
Department of Chemical Engineering, University of Patras (5 Years MEng) (27/9/2010 – 01/09/2016)
Mother tongue Greek
Languages English, B2, Certificate of Competency in English (The university of Michigan)
▪ Catalyst synthesis and characterization, XRD / BET/DRS, HPLC wastewater characterization (COD/TOC/BOD, TSS). Application of advanced oxidation processes (photocatalysis, electrochemistry, Fenton)
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Publications at Scientific Journals with Reviewers and Citation Index
- Ioannidou E., Ioannidi A.,Frontistis Z., Antonopoulou M., Tselios, C., Tsikritzis D., Konstantinou I., Kennou S, .Kondarides D.I., and Mantzavinos D., Correlating the properties of hydrogenated titania to reaction kinetics and mechanism for the photocatalytic degradation of bisphenol A under solar irradiation, Applied Catalysis B: Environmental, 2016 (5), 65-76.
- Ioannidi A., Frontistis Z., Mantzavinos D,Destruction of propyl paraben by persulfate activated with UV-A light
Publications at the Proceedings of Scientific Conferences
- Frontistis Z., Ioannidi A., Kassara K., Voukelatos G., Venieri D. and Mantzavinos D., Boron-doped diamond anodic oxidation of amoxicillin wastewater: Statistical evaluation of operating factors and antibiotic resistance, In Proceed. 4th European Conference on Environmental Applications of Advanced Oxidation Processes, Athens, October 2015, poster presentation.
- A. Ioannidi, Z Frontistis , D Mantzavinos., Destruction of propyl paraben by persulfate activated with UV-A light emitting diodes. 5th European Conference on Environmental Applications of Advanced Oxidation Processes, Prague, June 2017, poster presentation
Participation at conferences
- 10th PanHellenic Scientific Conference in Chemical Engineering, Patras, Greece, JUNE 2015.
- 4th European Conference on Environmental Applications of Advanced Oxidation Processes, Athens, October 2015.
- 14th PanHellenic Symposium of Catalysis, Patras, Greece, October 2016.