ZHANG Guo-zhen,WANG Hong-wei,LI Xiao-yan,et al.Characteristics of Ultraviolet Activated Persulfate for Degradation of Amoxicillin in Water[J].China Water & Wastewater,2021,37(19 19):53-59.
Characteristics of Ultraviolet Activated Persulfate for Degradation of Amoxicillin in Water
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
19 19
Page:
53-59
Column:
Date of publication:
2021-10-01
- Keywords:
- ultraviolet; potassium persulfate; amoxicillin; reaction kinetics; free radical
- Abstract:
- As the traditional process was difficult to effectively remove the refractory antibiotic pollutants in water, the ultraviolet activated potassium persulfate (UV/PPS) was thus applied to oxidize and degrade the typical antibiotic substance amoxicillin (AMX) in the water. The performances of the combined UV/PPS process, single UV and single PPS for the removal of AMX were compared. The effects of five factors including initial substrate concentration, PPS dosage, pH of the solution, bicarbonate ion concentration and chloride ion concentration on the degradation kinetics of the AMX were investigated, and the dominant active free radical in the reaction system was identified. The degradation of the AMX by the combined UV/PPS process, single UV process and single PPS process were all consistent with the quasi-first-order kinetic model (R2≥0.95), and the combined UV/PPS process greatly improved the removal efficiency of the AMX. The lower initial concentration of the substrate was conductive to the degradation of the AMX, and the maximum removal efficiency of the AMX was obtained when the persulfate dosage was 0.5 mmol/L. The reaction rate of the PPS activated by UV was faster when the pH of the solution was higher. The presence of HCO3- or Cl- both decreased the reaction rate, and the inhibition of HCO3- on the reaction was greater than that of Cl-. In the UV/PPS process, ·SO4- active free radical dominated the oxidative degradation of the AMX.
Last Update:
2021-10-01