Delia Teresa Sponza

Title : Removal of oxytetracycline antibiotic via photocatalytic process by SnO2/Bi2Sn2O7 nanocatalyst

Abstract:

SnO2/Bi2Sn2O7 heterojunction photocatalyst was fabricated to determine  the photocatalytic  removal of oxytetracycline antibiotic. Experimental results indicated that the existence of the built-in electric field between SnO2 and Bi2Sn2O7 led to a direct Z-scheme charge transfer. The efficient separation and fast transfer of photogenerated charge carriers contributed to boosting the photocatalytic performance of SnO2/Bi2Sn2O7. The optimal photocatalytic tetracycline degradation efficiency of SnO2/Bi2Sn2O7 was 98 % at a SnO2 to Bi2Sn2O7  ratio of 0.45, at a 1.80 mg/l  SnO2/Bi2Sn2O7 concentration at a power of 40 W after 20 min irrdiation. Radical trapping experiments and electron paramagnetic results indicated that the photocatalytic degradation process in SnO2/Bi2Sn2O7 system was modulated by photogenerated electrons, holes and O2− active species. The synthesized composites were characterized by the XRD, TEM, DRS and FTIR spectroscopy. The surface area of C2 composite (42.8 m2 /g) was measure from the nitrogen adsorption/desorption data using Brunauer–Emmett–Teller (BET). The performance enhancement of the photoactivity is because of improved electron-hole separation efciency due to active electron transfer between Bi2Sn2O7 and SnO2 from SnO2/Bi2Sn2O7 composite.

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Biography:

Prof. Dr. Delia Teresa Sponza is currently working as a professor at Dokuz Eylul University, Department of Environmental Engineering. Scientific study topics are; Environmental engineering microbiology, Environmental engineering ecology, Treatment of fluidized bed and activated sludge systems, Nutrient removal, Activated sludge microbiology, Environmental health, Industrial toxicity and toxicity studies, The effect of heavy metals on microorganisms, Treatment of toxic compounds by anaerobic / aerobic sequential processes, Anaerobic treatment of organic chemicals that cause industrial toxicity and wastewater containing them, Anaerobic treatability of wastewater containing dyes, Treatment of antibiotics with anaerobic and aerobic sequential systems, Anaerobic and aerobic treatment of domestic organic wastes with different industrial treatment sludges, Treatment of polyaromatic compounds with bio-surfactants in anaerobic and aerobic environments, Treatment of petrochemical, Textile and olive processing industry wastewater by sonication, Treatment of olive processing industry wastewater with nanoparticles and the toxicity of nanoparticles. She has many international publications.