Ciprofloxacin degradation by catalytic activation of monopersulfate using Mn–Fe oxides: performance and mineralization

Abstract

In this work, Mn2O3/Fe2O3 (MFO) was synthesized and used to activate monopersulfate (MPS) for the degradation of ciprofloxacin (CIP). The effect of several parameters was studied on CIP degradation. Under the optimum conditions (pH = 6.3 (natural pH), MFO = 300 mg/L and MPS = 2 mM), around 92% of CIP was decomposed. Nitrite, phosphate and bicarbonate ions had a strong inhibitory effect on the MFO/MPS process while the effect of chloride and nitrate ions was neutral. The catalytic activity of MFO was also studied by other chemical oxidants such as peroxydisulfate, periodate, hydrogen peroxide, percarbonate and peracetic acid. Scavenging tests showed that the role of sulfate radicals is more than hydroxyl radicals. MFO exhibited high catalytic activity in four recycling with insignificant leaching of Mn and Fe. During CIP oxidation, 45.5% carbon mineralization occurred and antibacterial activity of treated solution CIP was reduced. Finally, MFO/MPS was applied on actual wastewater (hospital effluent) and the results showed that MFO/MPS can be considered as a practical method for the treatment of contaminated water with emerging pollutants.

Visible light catalytic degradation of acid orange II via BiOI/UiO-66(Zr) activation of peroxymonosulfate

“…34 Moreover, under alkaline conditions, OH − decomposes PMS, as shown in formula (8), reducing PMS concentration in the reaction system and consequently decreasing AOII dye degradation efficiency. 35 To align with the practical treatment of most industrial dye wastewater, an initial solution pH of 7.0 was selected based on experimental results and comprehensive considerations.SO 4 − ˙ + OH − → SO 4 2− + ˙OHHSO 5 − + SO 5 2− + OH − → 2SO 4 2− + O 2 + H 2 O…”

“…36 Moreover, HCO 3 − reacts with PMS to generate peroxymonocarbonate (HCO 4 − ), as shown in formula (9). 35 This reaction consumes a part of the PMS, leading to a decrease in PMS concentration and consequently in the degradation rate of AOII. Therefore, in practical industrial dye wastewater treatment, the concentrations of HCO 3 − and CO 3 2− need to be carefully controlled.HCO 3 − + HSO 5 − = HSO 4 − + HCO 4 − …”

“…), as shown in formula (9). 35 This reaction consumes a part of the PMS, leading to a decrease in PMS concentration and consequently in the degradation rate of AOII. Therefore, in practical industrial dye wastewater treatment, the concentrations of HCO 3…”

Optimization of a novel hybrid photo-ozonation peroxymonosulfate process for degradation of Acid Black ATT dye in aqueous environment

“…Effect of pH pH plays a crucial role in AOPs due to its impact on the behavior of primary radicals, oxidant ionization, formation of reactive oxygen species, redox potential, and treatment effectiveness. [31] The pH not only affects the oxidizing power of radicals, but also influences the rate of radical generation and their reaction with organic matter. Additionally, the activity and solubility of the oxidant and active species increase as the production rate of radicals (•SO 4 2and •HO) is influenced by solution pH.…”

The evaluation of improved degradation of Acid Black ATT dye in aqueous solution by hybrid photo-ozonation peroxymonosulfate process

“…Since the aim of this study was the assessment of the effect of PMS on dye degradation by the UV/ozone process, different experiments were conducted to assess the extent of degradation of the dye in the presence of UV light alone, ozone alone, UV/O 3 , and UV/O 3 /PMS then effective parameters such as pH, initial dye concentration, reaction time, and PMS dosage were optimized for hybrid process. For the assessment of the rate of the decolorization, the rate of decolorization, COD removal e ciency, and nally total organic carbon (TOC) were monitored in treated e uents [32].…”