Combined activation of persulfate by biochars and artificial light for the degradation of sulfamethoxazole in aqueous matrices
Giannakopoulos S. Frontistis Z. Vakros J. Poulopoulos S.G. Manariotis I.D. Mantzavinos D.
July 2022Taiwan Institute of Chemical Engineers
Journal of the Taiwan Institute of Chemical Engineers
2022#136
Background: In our days antibiotics are used in high quantities and accumulate in waste waters. Advanced oxidation processes can be applied to eliminate completely the remaining antibiotics. Methods: Biochars from spent coffee grounds were synthesize, characterized with different physicochemical methods and were employed (mass concentration 100 mg/L) alongside artificial irradiation provided by either solar simulator or UV-A LED for the activation of sodium persulfate (SPS: 500 mg/L) to degrade sulfamethoxazole (SMX: 0.5 mg/L); this was done in various water matrices including ultrapure water (UPW), wastewater (WW) and bottled water (BW). Significant findings: The high-temperature biochar with a surface area of 301 m2/g is far more efficient than the low-temperature one with nearly zero surface area, while solar irradiation is more efficient than UV-A LED. The combined process is synergistic, i.e. the degree of synergy in UPW and acidic conditions, computed from first-order kinetic constants, is 39 and 47% for solar and UV-A LED irradiation, respectively. The organic matrix species typically found in waters and wastewaters only slightly retard degradation, however, complete SMX removal occurs within reasonable time-scale (i.e. 120 min for solar irradiation and 180 min for UV-A LED).
Antibiotics , Biochars , Light , SR-AOPs , Synergy , Water
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Department of Chemical Engineering, University of Patras, Caratheodory 1, University Campus, Patras, GR-26504, Greece
Department of Chemical Engineering, University of Western Macedonia, Kozani, GR–50100, Greece
Department of Chemical and Materials Engineering, School of Engineering and Digital Sciences, Nazarbayev University, 53 Kabanbay batyr ave, Nur-Sultan (Astana), 010000, Kazakhstan
Department of Civil Engineering, Environmental Engineering Laboratory, University of Patras, University Campus, Patras, GR-26504, Greece
Department of Chemical Engineering
Department of Chemical Engineering
Department of Chemical and Materials Engineering
Department of Civil Engineering
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