Sulfaquinoxaline oxidation by UV‐C activated sodium persulfate: Degradation kinetics and toxicological evaluation

Abstract

This study evaluates the efficiency of sulfate radicals used in advanced oxidation process in water treatment. The targeted pollutant is an antibiotic, sulfaquinoxaline (SQ-Na) sodium, widely used in the veterinary field. The results show a degradation of SQ-Na until 90% after 300 min of irradiation at optimal sodium persulfate (SPS) concentration (200 mg/L). Degradation of the antibiotic obeys a pseudo-first-order kinetics when the concentration of sulfate radicals ranging from 0 to 240 mg/L. The decomposition of SQ-Na via the UV/SPS method is favored significantly under acidic conditions but becomes slow at neutral pH and almost inhibited under alkaline conditions. The contribution of the sulfate radicals alone and of both radicals hydroxyl and sulfate on the SQ-Na degradation is evaluated at 69% and 80%, respectively. Toxicity tests with Sinapis alba and Daphnia magna on treated samples, before and after irradiation, indicate the formation of new by-products more toxic during the treatment process. @ 2019 Water Environment Federation • Practitioner points• SQ-Na was significantly degraded (90%) under UV/SPS system. • SQ-Na decay exhibited a pseudo-first-order kinetics. • SQ-Na was completely degraded via UV/SPS process under acidic conditions. • The shoot growth appears to be more sensitive to oxidation by-products toxicity than root growth. • Ineffectiveness in eliminating the ecotoxicity.

Kinetics and mechanisms of flumequine degradation by sulfate radical based AOP in different water samples containing inorganic anions

“…24 Among them, ultraviolet (UV) irradiation is environmentally friendly and commonly used as the activation methods (eqn (1) and 2). 25,26 At present, UV/PMS has been widely used in degradation of various antibacterial agents in water and wastewater, such as the chloramphenicol, 27 CIP and AMO, 28 sulfaquinoxaline, 29 norfloxacin, 30 ofloxacin, 31 ciprofloxacin, metronidazole (MNZ), 32 sulfamethoxazole (SMX) and sulfamethoxypyridazine (SMP). 33 The UV/PDS (PMS) process has been reported to be a possible method for removing antibiotics including FLU.…”

UV‐C Activation of Peroxides for Bisphenol A Removal from a Real Water Sample

“…Increasing the pH from acidic to neutral pH values may hinder effective oxidation of BPA by limiting the availability of SO 4 •− . In the pH range 7.0–10.5, both HO • and SO 4 •− are present in the reaction solution and might interact with each other [ 70,71 ] as shown below: …”