Sheikhmohammadi Amir, Asgari Esrafil, Alinejad Navid, Hashemzadeh Bayram
Department of Environmental Health Engineering, School of Health, Khoy University of Medical Sciences, Khoy, Iran.
Department of Public Health, Fasa University of Medical Sciences, Fasa, Iran.
Int J Environ Health Res. 2023 Feb;33(2):192-205. doi: 10.1080/09603123.2021.2013453. Epub 2021 Dec 8.
This study was aimed to investigate the synergistic effect of sulfite reducing agent on the UV/hematite (α-FeO) photocatalytic process performance in the removal of ciprofloxacin from the aqueous solutions. For this purpose, influence of the operation parameters including initial antibiotic concentration, pH, sulfite to hematite molar ratio and the reaction time on the UV/hematite/sulfite (UHS) performance was evaluated. UV alone, UV/hematite (α-FeO) (UH) and UV/sulfite (US) processes indicated to have little influence on the ciprofloxacin degradation. The simultaneous presence of hematite and sulfite in the reaction environment was significantly improved the degradation efficiency, as UHS process indicated an increase of 89%, 64% and 59% in the removal performance than that of UV alone, UH and US processes, respectively. Under the selected condition (pH of 7.0 and sulfite/hematite molar ratio of 1:3), 94% of ciprofloxacin (CFX) was degraded after 5 min of reaction. In addition, rmg L min) value for UHS process was 25.26, 6 and 4.8 times that of UV alone, UH and US processes, respectively. The EEO and TCS values for UV alone, US, UH and UHS processes were (44.21 kWh/m and 2.08 $ m), (10.5 kWh/m and 1.1 $ m), (4.8 kWh/m and 1.04 $ m) and (1.75 kWh/m and 0.85 $ m), respectively. In addition, the study of the reaction mechanism showed hydroxyl and sulfate radicals play a vital role in the degradation of CFX by UHS process.
本研究旨在探讨亚硫酸盐还原剂对紫外光/赤铁矿（α-Fe₂O₃）光催化过程从水溶液中去除环丙沙星性能的协同作用。为此，评估了包括初始抗生素浓度、pH值、亚硫酸盐与赤铁矿的摩尔比以及反应时间等操作参数对紫外光/赤铁矿/亚硫酸盐（UHS）性能的影响。单独的紫外光、紫外光/赤铁矿（α-Fe₂O₃）（UH）和紫外光/亚硫酸盐（US）过程对环丙沙星降解的影响较小。反应环境中同时存在赤铁矿和亚硫酸盐时，降解效率显著提高，因为UHS过程的去除性能分别比单独的紫外光、UH和US过程提高了89%、64%和59%。在选定条件（pH为7.0，亚硫酸盐/赤铁矿摩尔比为1:3）下，反应5分钟后94%的环丙沙星（CFX）被降解。此外，UHS过程的rmg L min）值分别是单独紫外光、UH和US过程的25.26倍、6倍和4.8倍。单独紫外光、US、UH和UHS过程的EEO和TCS值分别为（44.21 kWh/m³和2.08 $/m³）、（10.5 kWh/m³和1.1 $/m³）、（4.8 kWh/m³和1.04 $/m³）和（1.75 kWh/m³和0.85 $/m³）。此外，反应机理研究表明，羟基和硫酸根自由基在UHS过程降解CFX中起至关重要的作用。
